1
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Rahmani K, Haghighat Mamaghani A, Peyravi A, Hashisho Z, Crompton D, Anderson JE. Simultaneous effect of oxygen impurity and flow rate of purge gas on adsorption capacity of and heel buildup on activated carbon during cyclic adsorption-desorption of VOC. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135223. [PMID: 39029183 DOI: 10.1016/j.jhazmat.2024.135223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 06/20/2024] [Accepted: 07/14/2024] [Indexed: 07/21/2024]
Abstract
Irreversible adsorption, or heel buildup, negatively impacts activated carbon performance and shortens its lifetime. This study elucidates the interconnections between flow rate and the oxygen impurity of desorption purge gas with heel buildup on beaded activated carbon (BAC). Nine thermal desorption scenarios were explored, varying nitrogen purge gas oxygen impurity levels (<5 ppmv, 10,000 ppmv, 210,000 ppm (21 %)) and flow rates (0.1, 1, 10 SLPM or 1 %, 10 %, 100 % of adsorption flow rate) during thermal desorption. Results reveal that increasing purge gas flow rate improves adsorption capacity recovery and mitigates adverse effects of purge gas oxygen impurity. Cumulative heel increased with higher purge gas oxygen impurity and lower flow rates. In the least effective regeneration scenario (0.1 SLPM N2, 21 % O2), a 32.8 wt% cumulative heel formed on BAC after five cycles, while the best-case scenario (10 SLPM N2, <5 ppmv O2) resulted in only 0.3 wt%. Comparing the pore size distributions of virgin and used BAC shows that heel initially forms in narrow micropores (<8.5Å) and later engages mesopores. Thermogravimetric analysis (TGA) showed that oxygen impurity creates high boiling point and/or strongly bound heel species. TGA confirmed that higher purge gas flow rates reduce heel amounts but encourage chemisorbed heel formation in oxygen's presence. These findings can guide optimization of regeneration conditions, enhancing activated carbon's long-term performance in cyclic adsorption processes.
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Affiliation(s)
- Keivan Rahmani
- University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada
| | | | - Arman Peyravi
- University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada
| | - Zaher Hashisho
- University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB T6G 1H9, Canada.
| | - David Crompton
- Ford Motor Company, Environmental Quality Office, Dearborn, MI 48126, United States
| | - James E Anderson
- Ford Motor Company, Research and Advanced Engineering, Dearborn, MI 48121, United States
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2
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Li J, Zhou W, Meng X, Su Y, Zhao Y, Zhang W, Xie L, Gao J, Sun F, Wang P, Zhao G. Heat and mass transfer simulation of the microwave-assisted toluene desorption for activated carbons regeneration. ENVIRONMENTAL RESEARCH 2024; 251:118671. [PMID: 38479719 DOI: 10.1016/j.envres.2024.118671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/05/2024] [Accepted: 03/09/2024] [Indexed: 03/17/2024]
Abstract
The low cost and high efficiency of microwave-assisted regeneration render it a viable alternative to conventional regeneration methods. To enhance the regeneration performance, we developed a coupled electromagnetic, heat, and mass transfer model to investigate the heat and mass transfer mechanisms of activated carbon during microwave-assisted regeneration. Simulation results demonstrated that the toluene desorption process is governed by temperature distribution. Changing the input power and flow rate can promote the intensity of hot spots and adjust their distribution, respectively, thereby accelerating toluene desorption, inhibiting readsorption, and promoting regeneration efficiency. Ultimately, controlling the input power and flow rate can flexibly adjust toluene emissions to satisfy the processing demands of desorbed toluene. Taken together, this study provides a comprehensive understanding of the heat and mass transfer mechanisms of microwave-assisted regeneration and insights into adsorbent regeneration.
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Affiliation(s)
- Junfeng Li
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Wei Zhou
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.
| | - Xiaoxiao Meng
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.
| | - Yanlin Su
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Yang Zhao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Wenshuang Zhang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Liang Xie
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Jihui Gao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Fei Sun
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Pengxiang Wang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Guangbo Zhao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
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3
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Tzanakopoulou V, Pollitt M, Castro-Rodriguez D, Gerogiorgis DI. Dynamic Model Validation and Simulation of Acetone-Toluene and Benzene-Toluene Systems for Industrial Volatile Organic Compound (VOC) Abatement. Ind Eng Chem Res 2024; 63:7281-7299. [PMID: 38681870 PMCID: PMC11046434 DOI: 10.1021/acs.iecr.4c00251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 03/29/2024] [Accepted: 04/01/2024] [Indexed: 05/01/2024]
Abstract
Environmental impact mitigation is one of the grand challenges for industries globally. Volatile organic compounds (VOCs) are solvents whose emissions are potentially toxic to human health and ecosystems yet indispensable for the manufacturing of life-saving medicine. Adsorption with activated carbon columns is an established countermeasure for end-of-pipe emission control, whose efficiency, however, is impeded by irregular bed saturation due to the complex nature of its inputs. This work presents the application of a validated nonisothermal adsorption model to examine multicomponent trace mixtures of acetone-toluene and benzene-toluene on activated carbon. Our results indicate preferential adsorption of toluene over both acetone and benzene for all concentrations examined, which is in agreement with experimental data. Moreover, moderate temperature variations and pressure drops are revealed. Finally, Glueckauf's hodograph theory is employed for maximum outlet concentration prediction and compared with simulation results and experimental data, thus providing valuable insights into nonisothermal VOC abatement, which paves the way for industrial operation optimization.
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Affiliation(s)
- Vasiliki
E. Tzanakopoulou
- Institute
for Materials & Processes (IMP), School of Engineering, University
of Edinburgh, Edinburgh EH9 3FB, U.K.
| | - Michael Pollitt
- GlaxoSmithKline
(GSK), Montrose, Angus DD10 8EA, Scotland, U.K.
| | | | - Dimitrios I. Gerogiorgis
- Institute
for Materials & Processes (IMP), School of Engineering, University
of Edinburgh, Edinburgh EH9 3FB, U.K.
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4
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Kutluay S, Şahin Ö, Baytar O. Enhanced benzene vapor adsorption through microwave-assisted fabrication of activated carbon from peanut shells using ZnCl 2 as an activating agent. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:27935-27948. [PMID: 38523212 PMCID: PMC11058968 DOI: 10.1007/s11356-024-32973-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 03/14/2024] [Indexed: 03/26/2024]
Abstract
Herein, microwave-assisted activated carbon (MW-AC) was fabricated from peanut shells using a ZnCl2 activator and utilized for the first time to eliminate benzene vapor as a volatile organic compound (VOC). During the MW-AC production process, which involved two steps-microwave treatment and muffle furnace heating-we investigated the effects of various factors and achieved the highest iodine number of 1250 mg/g. This was achieved under optimal operating conditions, which included a 100% impregnation ratio, CO2 as the gas in the microwave environment, a microwave power set at 500 W, a microwave duration of 10 min, an activation temperature of 500 °C and an activation time of 45 min. The structural and morphological properties of the optimized MW-AC were assessed through SEM, FTIR, and BET analysis. The dynamic adsorption process of benzene on the optimized MW-AC adsorbent, which has a significant BET surface area of 1204.90 m2/g, was designed using the Box-Behnken approach within the response surface methodology. Under optimal experimental conditions, including a contact duration of 80 min, an inlet concentration of 18 ppm, and a temperature of 26 °C, the maximum adsorption capacity reached was 568.34 mg/g. The experimental data are better described by the pseudo-second-order kinetic model, while it is concluded that the equilibrium data are better described by the Langmuir isotherm model. MW-AC exhibited a reuse efficiency of 86.54% for benzene vapor after five consecutive recycling processes. The motivation of the study highlights the high adsorption capacity and superior reuse efficiency of MW-AC adsorbent with high BET surface area against benzene pollutant. According to our results, the developed MW-AC presents itself as a promising adsorbent candidate for the treatment of VOCs in various industrial applications.
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Affiliation(s)
- Sinan Kutluay
- Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey
| | - Ömer Şahin
- Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey
| | - Orhan Baytar
- Department of Chemical Engineering, Faculty of Engineering, Siirt University, 56100, Siirt, Turkey.
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5
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Zheng C, Yang X, Li M, Bai S. Bridging the Adsorption Data and Adsorption Process by Introducing a Polynomial Structure To Accurately Describe IUPAC Isotherms, Stepwise Isotherms, and Stepwise Breakthrough Curves. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4132-4141. [PMID: 38365593 DOI: 10.1021/acs.langmuir.3c03075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2024]
Abstract
Porous heterogeneous adsorbents, those composed of multiple pore structures and surface chemical adsorption sites, can result in various gas or vapor adsorption isotherms, including five types of IUPAC adsorption isotherms and stepwise adsorption isotherms that have been difficult to model using a single adsorption equilibrium model. The limitation of the above equilibrium model further restricts the calculations of complex stepwise breakthrough curves. To bridge the adsorption data and adsorption process, it is important to first develop a simple model or method to describe these isotherms of various complex adsorption systems. In this work, assuming that the effect of the diffusion rate can be neglected under the static condition and the adsorption process is discontinuous, the number of adsorption isotherm inflection points can be used to represent the changed number of adsorption interactions. With the introduction of the polynomial structure, a series of empirical or semi-empirical polynomial adsorption models were developed. The N-site polynomial Langmuir-Freundlich equation could accurately fit common type I, II, III, IV, and V adsorption isotherms and complex stepwise adsorption isotherms covering various adsorbates, such as volatile organic compounds (VOCs), toxic industrial chemicals (TICs), water vapor, and carbon dioxide, as well as different adsorbents, such as metal/covalent organic frameworks (MOFs/COFs), zeolites, and porous carbons. Similarly, the introduction of a polynomial structure, such as the N-site polynomial Yoon-Nelson equation, was also successful in the description of interesting stepwise breakthrough curves. This work provides a more accurate adsorption equilibrium model to characterize all types of isotherms. As a foundation model, it is expected to be used to simulate the gas-solid adsorption process inside the fixed and fluidized beds packed with porous adsorbents.
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Affiliation(s)
- Chao Zheng
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, People's Republic of China
| | - Xuanlin Yang
- Science and Technology on Near-Surface Detection Laboratory, Wuxi, Jiangsu 214000, People's Republic of China
| | - Ming Li
- School of Chemical Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Shupei Bai
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, People's Republic of China
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6
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Wang J, Vikrant K, Kim KH. Application of a manganese dioxide/amine-functionalized metal-organic framework nanocomposite as a bifunctional adsorbent-catalyst for the room-temperature removal of gaseous aromatic hydrocarbons. J Colloid Interface Sci 2024; 653:643-653. [PMID: 37741172 DOI: 10.1016/j.jcis.2023.09.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 09/13/2023] [Accepted: 09/17/2023] [Indexed: 09/25/2023]
Abstract
A high surface area (883 m2·g-1) nanocomposite composed of an amine-functionalized metal-organic framework (NH2-UiO-66 (U6N)) and manganese dioxide (MnO2@U6N) was prepared as bifunctional adsorbent-catalyst for the purification of multiple aromatic volatile organic compounds (VOCs) such as benzene (B), toluene (T), m-xylene (X), and styrene (S), i.e., BTXS. The performance of MnO2@U6N was assessed for BTXS removal both as single- and multi-component systems at room temperature (RT (20 °C)) under dark conditions. MnO2@U6N exhibited superior catalytic-adsorption activity for the RT removal of BTXS. The removal performance of MnO2@U6N against BTXS was then assessed across varying levels of flow rate, VOC concentration, adsorbent/catalyst mass, and relative humidity. To better understand the catalytic-adsorption activity, two types of non-linear kinetic models (pseudo-first-order and pseudo-second-order) were utilized to simulate the experimentally obtained data. In-situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) analysis was also conducted to interpret the removal mechanism of BTXS. Their adsorption capacity (mg·g-1) values are estimated to increase in the order of B (21.1) < T (66.0) < X (79.1) < S (129.7). It is suggested that the adsorbed aromatic VOC molecules on the surface of MnO2@U6N should react with active oxygen species (lattice and adsorbed oxygen) to yield the environmentally benigh end products (i.e., carbon dioxide and water) along with various intermediates (e.g., alkoxides, aldehydes, phenolates, carboxylates, and anhydrides). Accordingly, the VOC removal potential of MnO2@U6N has been validated through the synergistic combination between adsorption (primary process) and catalysis (subordinate process) at RT.
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Affiliation(s)
- Jiapeng Wang
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Kumar Vikrant
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
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7
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Zheng G, Wei K, Kang X, Fan W, Ma NL, Verma M, Ng HS, Ge S. A new attempt to control volatile organic compounds (VOCs) pollution - Modification technology of biomass for adsorption of VOCs gas. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 336:122451. [PMID: 37648056 DOI: 10.1016/j.envpol.2023.122451] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/15/2023] [Accepted: 08/23/2023] [Indexed: 09/01/2023]
Abstract
The detrimental impact of volatile organic compounds on the surroundings is widely acknowledged, and effective solutions must be sought to mitigate their pollution. Adsorption treatment is a cost-effective, energy-saving, and flexible solution that has gained popularity. Biomass is an inexpensive, naturally porous material with exceptional adsorbent properties. This article examines current research on volatile organic compounds adsorption using biomass, including the composition of these compounds and the physical (van der Waals) and chemical mechanisms (Chemical bonding) by which porous materials adsorb them. Specifically, the strategic modification of the surface chemical functional groups and pore structure is explored to facilitate optimal adsorption, including pyrolysis, activation, heteroatom doping and other methods. It is worth noting that biomass adsorbents are emerging as a highly promising strategy for green treatment of volatile organic compounds pollution in the future. Overall, the findings signify that biomass modification represents a viable and competent approach for eliminating volatile organic compounds from the environment.
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Affiliation(s)
- Guiyang Zheng
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Kexin Wei
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Xuelian Kang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Wei Fan
- School of Textile Science and Engineering & Key Laboratory of Functional Textile Material and Product of Ministry of Education, Xi'an Polytechnic University, Xi'an, Shanxi 710048, China
| | - Nyuk Ling Ma
- BIOSES Research Interest Group, Faculty of Science & Marine Environment, 21030 Universiti Malaysia Terengganu, Malaysia; Department of Sustainable Engineering, Institute of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, 602105, India
| | - Meenakshi Verma
- University Centre for Research and Development, Department of Chemistry, Chandigarh University, Gharuan, Mohali, Punjab, India
| | - Hui Suan Ng
- Centre for Research and Graduate Studies, University of Cyberjaya, Persiaran Bestari, 63000 Cyberjaya, Selangor, Malaysia
| | - Shengbo Ge
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
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8
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Açin Ok R, Kutluay S. Designing novel perlite-Fe 3O 4@SiO 2@8-HQ-5-SA as a promising magnetic nanoadsorbent for competitive adsorption of multicomponent VOCs. CHEMOSPHERE 2023; 338:139636. [PMID: 37495054 DOI: 10.1016/j.chemosphere.2023.139636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/18/2023] [Accepted: 07/22/2023] [Indexed: 07/28/2023]
Abstract
Volatile organic compounds (VOCs), which emerge as multicomponent pollutants through many industrial processes, pose a serious threat to human health and the eco-environment due to their volatility, toxicity and dispersion. Hence, the study of competitive adsorption of multicomponent VOCs is of practical and scientific importance. Herein, the perlite-supported Fe3O4@SiO2@8-hydroxyquinoline-5-sulfonic acid (perlite-Fe3O4@SiO2@8-HQ-5-SA) was designed as a novel magnetic nanoadsorbent by a simple strategy and employed for the competitive adsorption of multicomponent toluene, ethylbenzene and xylene in the vapor-phase targeted as VOCs. The successfully prepared perlite-Fe3O4@SiO2@8-HQ-5-SA was characterized by means of SEM, EDX, FT-IR, VSM and BET analyses. Adsorption capacities of 558 mg/g, 680 mg/g and 716 mg/g were achieved for single component toluene, ethylbenzene and xylene, respectively. It was concluded that the adsorption capacities for both binary and ternary components were significantly decreased compared to single component adsorption. The competitive adsorption capacity order of the binary and ternary component VOCs was xylene > ethylbenzene > toluene due to their competitive dominance. The rate-limiting kinetic analysis indicated that the adsorption rates were determined by both the film diffusion and intraparticle diffusion. The analysis of the error metrics demonstrated that the three-parameter isotherm models better described the adsorption data compared to the two-parameter models. In particular, the Toth model provided the closest fit to the experimental equilibrium data. The thermodynamic analysis indicated the spontaneous nature and probability (ΔG° <0), exothermic (ΔH° <0), physical (ΔH° <20 kJ/mol) and a declination in the degree of randomness (ΔS° <0) of the adsorption processes. The reuse efficiency of perlite-Fe3O4@SiO2@8-HQ-5-SA for toluene, ethylbenzene and xylene decreased to only by 88.91%, 88.07% and 87.16% after five recycles. The perlite-Fe3O4@SiO2@8-HQ-5-SA has a significant adsorptive potential compared to other adsorbents reported in the literature, thus it could be recommended as a promising nanoadsorbent for VOCs in industrial processes.
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Affiliation(s)
- Rahime Açin Ok
- Department of Chemical Engineering, Faculty of Engineering, Siirt University, 56100, Siirt, Turkey
| | - Sinan Kutluay
- Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey; Department of Chemical Engineering, Faculty of Engineering, Siirt University, 56100, Siirt, Turkey.
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9
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Tzanakopoulou MV, Pollitt DM, Castro-Rodriguez DD, Costa DA, Gerogiorgis DD. Dynamic modelling, simulation and theoretical performance analysis of Volatile Organic Compound (VOC) abatement systems in the pharma industry. Comput Chem Eng 2023. [DOI: 10.1016/j.compchemeng.2023.108248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
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10
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Chen Z, He R. Competitive adsorption characteristics of gasoline evaporated VOCs in microporous activated carbon by molecular simulation. J Mol Graph Model 2023; 121:108444. [PMID: 36871474 DOI: 10.1016/j.jmgm.2023.108444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/13/2023] [Accepted: 02/26/2023] [Indexed: 03/02/2023]
Abstract
The activated carbon in the vehicle's carbon canister needs to adsorb a variety of VOCs (Volatile Organic Compounds) emitted by gasoline evaporation, while the difference in gas adsorption capacity can lead to adsorption competition phenomena. In this study, three typical VOCs (toluene, cyclohexane, and ethanol) were selected to study the adsorption competition characteristics between multi-component gases at different pressures by molecular simulation method. In addition, the effect of temperature on adsorption competition was also investigated. The results show that the selectivity of activated carbon to toluene is negatively correlated with the adsorption pressure, but the opposite is true for ethanol, and the change of cyclohexane is not significant. The competitive order of the three VOCs is toluene > cyclohexane > ethanol at low pressure, which becomes ethanol > toluene > cyclohexane at high pressure. With increasing pressure, the interaction energy decreases from 12.87 kcal/mol to 11.87 kcal/mol, where the electrostatic interaction energy increases from 1.97 kcal/mol to 2.54 kcal/mol. In microporous activated carbon, the competition is mainly manifested in that ethanol preempts the low-energy adsorption sites of toluene in the pore size of 10 Å to 18 Å, while gas molecules near the surface of activated carbon or in smaller pore sizes are stably adsorbed without competition. Despite the fact that high temperature decreases the total adsorption capacity, activated carbon selectivity for toluene increases instead, while the competitiveness of polar ethanol decreases significantly.
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Affiliation(s)
- Zihan Chen
- School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Ren He
- School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China.
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11
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Prediction of breakthrough curves for multicomponent adsorption in a fixed-bed column using logistic and Gompertz functions. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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12
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Davarpanah M, Hashisho Z, Crompton D, Anderson JE. Modeling the performance of a metal-organic framework (MIL-101) for the adsorption of toluene in an industrial fluidized bed adsorber and comparison to other adsorbent materials. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Liu X, Zhu H, Wu W, Lin D, Yang K. Role of molecular size of volatile organic compounds on their adsorption by KOH-activated micro-mesoporous carbon. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127355. [PMID: 34638076 DOI: 10.1016/j.jhazmat.2021.127355] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 06/13/2023]
Abstract
KOH-activated carbon (KAC) with high surface area and abundant micropores are widely used in adsorbing volatile organic compounds (VOCs). Kinetic diameters (σ) of VOCs are an important factor controlling diffusion of VOCs into pores of adsorbent. Yet the influence of kinetic diameters of VOCs on their adsorption by KAC remains unclear. Here, we investigated the dynamic adsorption of VOCs with various kinetic diameters on a prepared KAC with high surface area of 3100 m2/g, pore volume of 2.08 cm3/g and average pore width (D) of 2.68 nm. Adsorption affinity was negatively correlated with size difference (D-σ), indicating that pore width of adsorbent should close to σ to obtain a strong interaction between VOCs and adsorbents. Amounts adsorbed were positively correlated with σ at low relative pressures (p/p0 < 0.01), and negatively correlated with σ at high relative pressures (p/p0 > 0.044). The above results suggest that larger molecules with higher affinities are preferentially adsorbed at low relative pressures, amounts adsorbed of smaller molecules are larger than that of bigger molecules at high relative pressures. This study provided new insights into adsorption mechanisms mediated by σ and the development of next generation adsorbents for efficient removal of VOCs.
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Affiliation(s)
- Xianyu Liu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
| | - Hongxia Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
| | - Wenhao Wu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
| | - Daohui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Kun Yang
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China; Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, China.
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14
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Davarpanah M, Hashisho Z, Crompton D, Anderson JE. Mathematical correlations in two-phase modeling of fluidized bed adsorbers. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127218. [PMID: 34547691 DOI: 10.1016/j.jhazmat.2021.127218] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/27/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
Choosing proper formulas for estimating different variables is imperative when modeling a fluidized bed using two-phase theory. In this study, a two-phase model was used to model the adsorption of volatile organic compounds (VOC) in a multistage fluidized bed adsorber. Two different approaches were used to describe gas flow and mixing in the emulsion phase, perfectly mixed (EGPM: Emulsion Gas - Perfectly Mixed) and plug flow (EGPF: Emulsion Gas - Plug flow). The impact of different formulas for estimating bubble size, bed porosity at minimum fluidization velocity, adsorption and interphase mass transfer coefficients, as well as tortuosity on the performance of the model was determined by comparing the model outcomes with experimental data. Finally, using a large dataset obtained from fluidized bed adsorption systems with different adsorbents, adsorbates, bed sizes, and operating conditions, a broadly-applicable set of formulas was suggested which could be used to describe the behavior of different countercurrent fluidized bed adsorbers. From the results, the two-phase model could successfully predict the experimental data, with EGPF showing better performance than EGPM. Proper use of formulas, especially those describing bed voidage and interphase mass transfer coefficient, could markedly improve the performance of the two-phase model. The two-phase model using the set of formulas proposed here was able to accurately replicate a large dataset of fluidized bed adsorption experiments over a wide range of operating conditions.
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Affiliation(s)
- Morteza Davarpanah
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Zaher Hashisho
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - David Crompton
- Ford Motor Company, Environmental Quality Office, Dearborn, MI 48126, USA
| | - James E Anderson
- Ford Motor Company, Research and Advanced Engineering, Dearborn, MI 48121, USA
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15
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Pollard ZA, Cannon A, Ryan EM, Goldfarb JL. Capturing the effects of particle heterogeneity on adsorption in a fixed bed. AIChE J 2022. [DOI: 10.1002/aic.17618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zoe A. Pollard
- Department of Biological and Environmental Engineering Cornell University Ithaca New York USA
| | - Andrew Cannon
- Department of Mechanical Engineering Boston University Boston Massachusetts USA
| | - Emily M. Ryan
- Department of Mechanical Engineering Boston University Boston Massachusetts USA
| | - Jillian L. Goldfarb
- Department of Biological and Environmental Engineering Cornell University Ithaca New York USA
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16
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Yin T, Meng X, Wang S, Yao X, Liu N, Shi L. Study on the adsorption of low-concentration VOCs on zeolite composites based on chemisorption of metal-oxides under dry and wet conditions. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119634] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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17
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Wang X, Cheng H, Ye G, Fan J, Yao F, Wang Y, Jiao Y, Zhu W, Huang H, Ye D. Key factors and primary modification methods of activated carbon and their application in adsorption of carbon-based gases: A review. CHEMOSPHERE 2022; 287:131995. [PMID: 34509016 DOI: 10.1016/j.chemosphere.2021.131995] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 07/26/2021] [Accepted: 08/22/2021] [Indexed: 06/13/2023]
Abstract
To achieve carbon neutrality, it is necessary to control carbon-based gas emissions to the atmosphere. Among the various carbon-based gas removal technologies reported to date, adsorption is considered one of the most promising because of its economic efficiency, reusability, and low energy consumption. Activated carbon is widely used to treat different types of carbon-based gases owing to its large specific surface area, abundant functional groups, and strong adsorption capacity. This paper reviews the recent research progress into activated carbon as an adsorbent for carbon-based gases. The key factors (i.e., specific surface area, pore structure, and surface functional groups) affecting the adsorption of carbon-based gases by activated carbon were analyzed. The main methods employed to modify activated carbon (i.e., surface oxidation, surface reduction, loading materials, and plasma modification methods) to improve its adsorption capacity are also discussed herein, along with the targeted applications of such material in the adsorption of different types of carbon-based gases (such as aldehydes, ketones, aromatic hydrocarbons, halogenated hydrocarbons, and carbon-based greenhouse gases). Finally, the future development directions and challenges of activated carbon are discussed. Our work will be expected to benefit the development of activated carbon exhibiting selective adsorption properties, and reduce the production costs of adsorbents.
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Affiliation(s)
- Xiaohong Wang
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Hairong Cheng
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Guangzheng Ye
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Jie Fan
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Fan Yao
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Yuqin Wang
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Yujun Jiao
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Wenfu Zhu
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China
| | - Haomin Huang
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, 510006, Guangzhou, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), 510006, Guangzhou, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, 510006, Guangzhou, China.
| | - Daiqi Ye
- School of Environment and Energy, South China University of Technology, 510006, Guangzhou, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, 510006, Guangzhou, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), 510006, Guangzhou, China; Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, 510006, Guangzhou, China
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18
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Chen T, Fu C, Liu Y, Pan F, Wu F, You Z, Li J. Adsorption of volatile organic compounds by mesoporous graphitized carbon: Enhanced organophilicity, humidity resistance, and mass transfer. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118464] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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19
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Huang SC, Chung TW, Wu HT. Effects of Molecular Properties on Adsorption of Six-Carbon VOCs by Activated Carbon in a Fixed Adsorber. ACS OMEGA 2021; 6:5825-5835. [PMID: 33681621 PMCID: PMC7931418 DOI: 10.1021/acsomega.0c06260] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
Gravimetric adsorption equipment with a microbalance was used to measure the adsorption of volatile organic compounds (VOCs) by activated carbon from 288 to 313 K. VOCs [n-hexane, cyclohexane, 1-hexene, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, acetone, butanone, and 2-pentanone (Pentan-2-one)] were used as adsorbates in the adsorption system. Considering the geometric barrier, the critical diameter, and the boiling point, the adsorption capacities for six-carbon (C6) alkane isomers decrease in the order of n-hexane, 3-methylpentane, and 2-methylpentane. The adsorbates, including nonpolar or weakly polar substances, and substances with smaller geometric obstacles and smaller molecular weights, were more easily adsorbed by the activated carbon. However, the dipole-dipole interactive force at higher pressures resulted in a higher adsorption capacity for 1-hexene than for n-hexane. Both polarity and molecular size should be considered in the analysis of the adsorption of ketones by activated carbon. The adsorption equilibrium constants decreased with increases in temperature because a higher temperature was unfavorable for adsorption. The results for the Toth adsorption isotherm model fitted by the adsorption data showed that the experimental data and the Toth adsorption isotherm model were consistent with each other, as evidenced by the low deviation between the experimental data and those from the fitted model.
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Affiliation(s)
- Show-Chu Huang
- Department
of Chemical Engineering, Chung Yuan Christian
University, No. 200, Chung Pei Road, Chung Li District, Taoyuan City 32023, Taiwan, ROC
| | - Tsair-Wang Chung
- Department
of Chemical Engineering, Chung Yuan Christian
University, No. 200, Chung Pei Road, Chung Li District, Taoyuan City 32023, Taiwan, ROC
| | - Hung-Ta Wu
- Department
of Chemical and Materials Engineering, National
Ilan University, No. 1, Section 1, Shennong Road, Yilan City, Yilan County, Taiwan 260, ROC
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20
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Davarpanah M, Hashisho Z, Crompton D, Anderson JE, Nichols M. Modeling VOC adsorption in lab- and industrial-scale fluidized bed adsorbers: Effect of operating parameters and heel build-up. JOURNAL OF HAZARDOUS MATERIALS 2020; 400:123129. [PMID: 32569982 DOI: 10.1016/j.jhazmat.2020.123129] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/22/2020] [Accepted: 06/04/2020] [Indexed: 06/11/2023]
Abstract
Scale-up and optimization of fluidized beds are challenging due to the difficulty in accounting for the interrelated effect of various phenomena, which are typically described by empirical and/or semi-empirical equations. In this study, a two-phase model was introduced to simulate the adsorption of VOCs on beaded activated carbon (BAC) in a lab-scale fluidized bed adsorber. The model assumes the presence of a bubble phase free from adsorbent particles, and an emulsion phase composed of the adsorbent particles and interstitial gas. The versatility of the proposed model was then evaluated using data from an industrial scale adsorber with different operating conditions, adsorbent properties, and bed geometry. The response of the model to the operating conditions (adsorbent feed rate, air flow rate and initial concentration) showed better agreement with the experimental lab-scale data when the emulsion gas in two-phase model was considered in plug flow than in perfectly-mixed flow (R2 = 0.96 compared to 0.91). To simulate the performance of BACs with different service lifetimes (degree of exhaustion as a result of heel developed inside their pores), the main characteristics of the BACs (pore diameter, porosity, and adsorption capacity) were first correlated to their apparent densities. The model could accurately predict the experimental lab-scale VOC concentrations in each stage (R2 = 0.92) as well as overall removal efficiencies (R2 = 0.99) for BACs ranging from virgin to fully-spent. Finally, the model was used to predict the performance of an industrial-scale fluidized bed adsorber for VOC removal at different operating conditions and apparent densities. Predicted and measured VOC removal efficiencies were in good agreement (R2 = 0.94). Although the model was verified for adsorption of VOCs on BAC, the modeling approach presented in this study could be used for describing adsorption in different adsorbate-adsorbent systems in multistage counter-current fluidized bed adsorbers.
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Affiliation(s)
- Morteza Davarpanah
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Zaher Hashisho
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.
| | - David Crompton
- Ford Motor Company, Environmental Quality Office, Dearborn, MI, 48126 USA
| | - James E Anderson
- Ford Motor Company, Research and Advanced Engineering, Dearborn, MI, 48121 USA
| | - Mark Nichols
- Ford Motor Company, Research and Advanced Engineering, Dearborn, MI, 48121 USA
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21
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Vikrant K, Lim DH, Younis SA, Kim KH. An efficient strategy for the enhancement of adsorptivity of microporous carbons against gaseous formaldehyde: Surface modification with aminosilane adducts. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 743:140761. [PMID: 32659563 DOI: 10.1016/j.scitotenv.2020.140761] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/03/2020] [Accepted: 07/03/2020] [Indexed: 06/11/2023]
Abstract
In an effort to develop a cost-effective mitigation tool for volatile organic compounds, particularly formaldehyde (FA), microporous activated carbon (AC) was modified into three different forms of AC-1, AC-2, and AC-3 using a raw commercial AC product (AC-0). First, AC-1 and AC-2 were produced by the modification of AC-0 with N/S heteroatoms using identical mixture of dicyandiamide and thiourea precursors through either solvothermal (AC-1) or microwave-assisted calcination (AC-2) synthesis. Second, aminosilane-functionalized AC (AC-3) was prepared solvothermally using N-[3-(Trimethoxysilyl)propyl]ethylenediamine reagent. The relative adsorption performances for gaseous FA (1 ppm) in terms of 10% breakthrough volume (BTV10: L atm g-1) at near-ambient conditions (25 °C and 1 atm) were AC-3 (132) > AC-2 (66.5) > AC-1 (14.2) > AC-0 (10.4). In a comparison based on partition coefficients (mole kg-1 Pa-1) at BTV10, AC-3 outperformed AC-0 by a factor of 214, while the adsorption performance of AC-2 was 36-times higher than AC-1. The enhanced performance of AC-2 over AC-1 reflected the effect of the microwave synthesis protocol on the improvement of surface chemistry (e.g., N/S doping) and texture (e.g., surface area and pore volume) of AC-based adsorbents as compared to conventional solvothermal method. Further, the prominent role of surface chemistry (e.g., relative to textural properties), as observed with the increases in the amount of doped functional elements (including N:C and silicon:C ratios), is supported by the apparent dependence of performance on the selected modification procedures. Based on kinetic and X-ray photoelectron spectroscopy analyses, the superiority of aminosilylated AC-3 can be attributed to a synergistic effect between physisorption (e.g., pore diffusion) and chemical interactions of the FA carbonyl (C=O) group with amine and silica functionalities (via Mannich coupling [Schiff base] and cycloaddition reaction mechanisms, respectively). This confirms the significance of surface chemistry, relative to pore diffusion, in achieving maximum adsorption of gaseous FA molecules.
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Affiliation(s)
- Kumar Vikrant
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Dae-Hwan Lim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Sherif A Younis
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea; Analysis and Evaluation Department, Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo 11727, Egypt
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
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22
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Shen Y, Zhang N. A facile synthesis of nitrogen-doped porous carbons from lignocellulose and protein wastes for VOCs sorption. ENVIRONMENTAL RESEARCH 2020; 189:109956. [PMID: 32980025 DOI: 10.1016/j.envres.2020.109956] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 07/13/2020] [Accepted: 07/14/2020] [Indexed: 06/11/2023]
Abstract
This paper reported a sustainable method for preparation of N-doped porous carbon from co-hydrothermal carbonization (co-HTC) of lignocellulose (as a carbon skeleton) and sludge protein (as a nitrogen dopant). The HTC pretreatment could improve the yield of porous carbon. Although a low mass ratio (1:1) of biochar and KOH was employed, large specific surface areas of the porous carbons could be achieved. The porous carbon from rice husk (RH) by the HTC (260 °C) combined with the KOH activation (750 °C) had a largest BET surface area up to 1396.5 m2/g. Meanwhile, its adsorption capacity on toluene could reach 394.2 mg/g. It was attributed to its large specific surface area and hierachical porous structure with higher meso-porosity. The porous carbons with N-doping also improved the adsorption capacity. Furthermore, thermal desorption at around 300 °C had a high potential for regeneration of the saturated porous carbons.
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Affiliation(s)
- Yafei Shen
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China.
| | - Niyu Zhang
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China
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23
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Vikrant K, Kim KH. Insights into critical sources of bias in quantitation of volatile organic compounds based on headspace extraction approach. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Yao X, Liu Y, Li T, Zhang T, Li H, Wang W, Shen X, Qian F, Yao Z. Adsorption behavior of multicomponent volatile organic compounds on a citric acid residue waste-based activated carbon: Experiment and molecular simulation. JOURNAL OF HAZARDOUS MATERIALS 2020; 392:122323. [PMID: 32097857 DOI: 10.1016/j.jhazmat.2020.122323] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 02/12/2020] [Accepted: 02/14/2020] [Indexed: 05/09/2023]
Abstract
A considerable amount of volatile organic compounds (VOCs) is emitted, and a vast amount of citric acid residue (CAR) waste is simultaneously produced during citric acid production. Thus, a suitable method realizing the clean production of citric acid must be developed. This study investigated the adsorption of the multicomponent VOCs in a homemade CAR waste-based activated carbon (CAR-AC). A fixed-bed experimental setup was used to explore the adsorption and desorption of single- and multi-component VOCs. Surface adsorption and diffusion molecular models with different defects were built to study the underlying adsorption and diffusion mechanisms of multicomponent VOCs on CAR-AC. The adsorption amount of ethyl acetate in CAR-AC from multicomponent VOCs was 3.04 and 5.91 times higher than those of acetone and acetaldehyde, respectively, and the interaction energy between ethyl acetate and C surfaces was low at -13.41 kcal/mol. During desorption, the most weakly adsorbed acetaldehyde desorbed from the surface of CAR-AC first, followed by acetone and ethyl acetate. The regeneration efficiencies of acetaldehyde, acetone, and ethyl acetate reached 88.77, 85.55, and 91.46 %, respectively, after four adsorption/desorption cycles. We aimed to provide a new strategy to realize the recycle use of CAR and the clean production of citric acid.
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Affiliation(s)
- Xiaolong Yao
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Yao Liu
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Tong Li
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Tingting Zhang
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Hailong Li
- School of Energy Science and Engineering, Central South University, Changsha, 410083, China
| | - Wei Wang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, China
| | - Xianbao Shen
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Feng Qian
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Zhiliang Yao
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China.
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25
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Laskar II, Hashisho Z. Insights into modeling adsorption equilibria of single and multicomponent systems of organic and water vapors. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116681] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Vikrant K, Kim KH, Kumar S, Boukhvalov DW. Metal-Organic Frameworks for the Adsorptive Removal of Gaseous Aliphatic Ketones. ACS APPLIED MATERIALS & INTERFACES 2020; 12:10317-10331. [PMID: 32041396 DOI: 10.1021/acsami.9b20375] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Recent research endeavors have established metal-organic frameworks (MOFs) as suitable platforms for the adsorptive removal of various environmental pollutants. In this regard, the sorptive performances of four MOFs (MOF-199, UiO-66, UiO-66-NH2, and Co-CUK-1) were investigated against two gaseous aliphatic ketones (methyl ethyl ketone (MEK) and methyl isobutyl ketone (MiBK)) at a low partial pressure (0.1 Pa). Activated carbon was utilized as a reference commercial sorbent. The 10% breakthrough volume (BTV10) values for MEK decreased in the following order: MOF-199 (4772 L atm g-1) > activated carbon (224 L atm g-1) > UiO-66-NH2 (106 L atm g-1) > UiO-66 (53 L atm g-1) > Co-CUK-1 (16 L atm g-1). In case of MiBK, the relative ordering in BTV10 was consistently maintained while showing noticeable increases in its magnitude: MOF-199 (7659 L atm g-1) > activated carbon (816 L atm g-1) > UiO-66-NH2 (304 L atm g-1) > UiO-66 (150 L atm g-1) > Co-CUK-1 (31 L atm g-1). The superiority of MOF-199 was confirmed toward the adsorptive removal of gaseous aliphatic ketones. For a binary mixture of ketones, the BTV10 values of MOF-199 were reduced considerably for MEK and MiBK (in comparison to single component sorption) such as 1579 and 3969 L atm g-1, respectively, reflecting competitive inhibition of the adsorption process. Theoretical simulations based on density functional theory (DFT) elucidated the involvement of highly favorable coordination between the carbonyl group present in ketone molecules and the uncoordinated Cu(II) sites in the MOF-199 structure (Lewis acidic centers). Interestingly, MOF-199 maintained appreciable performance toward the mixture of ketones up to 5 cycles to support its practical merit.
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Affiliation(s)
- Kumar Vikrant
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
| | - Sandeep Kumar
- Department of Bio and Nano Technology, Guru Jambheshwar University of Science & Technology, Hisar 125001, India
| | - Danil W Boukhvalov
- Institute of Materials Physics and Chemistry, College of Science, Nanjing Forestry University, Nanjing 210037, China
- Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Russia
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27
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Kumar A, Singh E, Khapre A, Bordoloi N, Kumar S. Sorption of volatile organic compounds on non-activated biochar. BIORESOURCE TECHNOLOGY 2020; 297:122469. [PMID: 31787517 DOI: 10.1016/j.biortech.2019.122469] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 11/13/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
This work dealt with the determination of the suitability of sorption of Volatile Organic Compounds (VOCs) on biochars prepared from neem, sugarcane and bamboo feedstocks. Six different VOCs namely benzene, toluene, methyl chloride, xylene, chloroform and carbon tetrachloride were used in a laboratory-scale set-up on non-activated biochars prepared via slow pyrolysis (350-550 °C). Although all the chars showed considerable sorption but amongst them N3 (neem-based biochar) showed the maximum removal efficiency (65.5 mg g-1 for toluene). Variation in pyrolysis temperature and feedstock type showed significant change in the porosity and specific surface area of the biochar, which is favorable for VOC sorption efficiency. With higher surface area and contact time, the sorption capacity of char enhanced. However, the extent of sorption capacity of biochars differed with changing VOC type. Pseudo-Second-Order model fitted well with the results obtained from VOC sorption kinetics.
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Affiliation(s)
- Aman Kumar
- Central University of Jharkhand, Brambe, Ranchi 835 205, India; CSIR-National Environmental and Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, India
| | - Ekta Singh
- Central University of Jharkhand, Brambe, Ranchi 835 205, India; CSIR-National Environmental and Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, India
| | - Abhishek Khapre
- CSIR-National Environmental and Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, India; The Academy of Scientific and Innovative Research, Ghaziabad (AcSIR), Ghaziabad, Uttar Pradesh, 201 002, India
| | | | - Sunil Kumar
- CSIR-National Environmental and Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, India; The Academy of Scientific and Innovative Research, Ghaziabad (AcSIR), Ghaziabad, Uttar Pradesh, 201 002, India.
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28
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Vikrant K, Kim KH, Szulejko JE, Boukhvalov D, Shang J, Rinklebe J. Evidence of inter-species swing adsorption between aromatic hydrocarbons. ENVIRONMENTAL RESEARCH 2020; 181:108814. [PMID: 31784078 DOI: 10.1016/j.envres.2019.108814] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 09/05/2019] [Accepted: 10/08/2019] [Indexed: 06/10/2023]
Abstract
In this research, the competitive adsorption characteristics between aromatic hydrocarbons were investigated. It is well-known that an industrial effluent may contain a mixture of pollutants. The composition of effluents is usually highly variable in nature to depend upon the feedstock. Hence, one of the pollutants that is present in larger amounts may have the potential to dominate the sorption processes. Although many studies have investigated the competitive adsorption of volatile organic compounds (VOCs) onto activated carbon (AC) in detail, little is known about how the overall process is influenced when a fresh incoming VOC molecule encounters a sorbent bed pre-loaded with other VOCs. Consequently, the objective of the present study was to investigate the stability of pre-adsorbed VOC molecules in the presence of other potentially competitive VOCs in the influent stream. In this regard, the sorbent bed of AC was first preloaded with benzene (50 ppm (0.16 mg L-1)) and subsequently challenged by either high purity nitrogen or a stream of xylene (at 10, 50, or 100 ppm (0.043, 0.22, or 0.43 mg L-1)). The desorption rate of preloaded benzene and uptake rate of challenger xylene were assessed simultaneously. The maximum desorption rates of benzene (Rb) against two challenge scenarios (e.g., 100 ppm (0.43 mg L-1) xylene and pure N2) were very different from each other, i.e., 663 vs. 257 g kg-1 h-1, and their final benzene recoveries were 84% and 42%, respectively. The initially high desorption rate for the former quickly decreased with decreasing benzene residual capacity (C, mg g-1). Interestingly, the adsorption capacity of xylene increased considerably after the preloading of benzene (relative to no preloading). As such, 10% breakthrough volumes (BTV10) of 100, 50, and 10 ppm (0.43, 0.22, and 0.043 mg L-1) xylene challenge scenarios increased significantly from 100 to 186, 43.4 to 694, and 600 to 1000 L atm g-1, respectively. The prevalent mechanisms were analyzed using density functional theory (DFT)-based modelling approaches. The results demonstrated effective replacement of pre-adsorbed molecules with weaker affinity (e.g., benzene) when challenged by molecules with stronger affinity (e.g., xylene) toward the sorbent; this was accompanied by noticeable synergistic enhancement in the adsorption capacity of the latter.
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Affiliation(s)
- Kumar Vikrant
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea.
| | - Jan E Szulejko
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea
| | - Danil Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing, 210037, PR China; Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002, Ekaterinburg, Russia
| | - Jin Shang
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, Wuppertal, 42285, Germany; Department of Environment, Energy and Geoinformatics, Sejong University, 98 Gunja-Dong, Seoul, Republic of Korea.
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Yang K, Liu Y, Li Y, Cao Z, Zhou C, Wang Z, Zhou X, Baig SA, Xu X. Applications and characteristics of Fe-Mn binary oxides for Sb(V) removal in textile wastewater: Selective adsorption and the fixed-bed column study. CHEMOSPHERE 2019; 232:254-263. [PMID: 31154186 DOI: 10.1016/j.chemosphere.2019.05.194] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 05/19/2019] [Accepted: 05/22/2019] [Indexed: 06/09/2023]
Abstract
In this study, the selective adsorption performance of different Fe-Mn binary oxides (FMBOs) towards Sb(V) in the textile wastewater under different concentrations of coexisting anions, surfactants and dyes were investigated. Results showed that the influences of different anions on the Sb(V) removal followed an order of phosphate > carbonate > sulfate > nitrate > chloride. The frequently-used organic acid of acetate was found to have insignificant effect. The coexisting surfactant with sulfonic groups could have adverse effect on the removal due to sulfonic groups could compete the adsorptive sites on Fe oxides with Sb(V). While the quaternary ammonium surfactant might have minor effect. The influences of the three widely used dyes on the Sb(V) adsorption decreased in the following order: reactive black-5 >acid orange-7> disperse blue-60, which confirmed that the dyes with sulfonic groups would have relatively higher effect. The selective adsorption capacities of Sb(V) by FMBOs followed an order of FMBO3> FMBO5 >FMBO10> FMBO20>PFO. Fixed-bed column adsorption supplied useful parameters and evidently indicated that the cyclic utilization of FMBO3 was cost-efficient for practical dynamic Sb(V) removal. The Sb(V) removal by FMBO3 from real textile wastewater can simultaneously improve the removal efficiency, stabilize pH and prevent the increase of iron concentration as compared to the traditional coagulation, further demonstrating the high practical applicability of FMBO3.
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Affiliation(s)
- Kunlun Yang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Yuanli Liu
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Yizhou Li
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Zhen Cao
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Chuchen Zhou
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Zheni Wang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Xurui Zhou
- Department of Resource Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Shams Ali Baig
- Department of Environmental Sciences, Abdul Wali Khan University, Mardan, 23200, Pakistan
| | - Xinhua Xu
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China.
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30
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Li R, Chong S, Altaf N, Gao Y, Louis B, Wang Q. Synthesis of ZSM-5/Siliceous Zeolite Composites for Improvement of Hydrophobic Adsorption of Volatile Organic Compounds. Front Chem 2019; 7:505. [PMID: 31380349 PMCID: PMC6647869 DOI: 10.3389/fchem.2019.00505] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 07/02/2019] [Indexed: 11/23/2022] Open
Abstract
In this research, we investigated the hydrophobicity and dynamic adsorption-desorption behaviors of volatile organic compounds (VOCs) by applying different optimized coating dosage (25, 50, and 75%) on designed novel ZSM-5/MCM-41 and ZSM-5/Silicalite-1 hierarchical composites. The relatively large specific surface area and pore volume of adsorbents ZSM-5/MCM-41 and ZSM-5/Silicalite-1 composites with excellent stability were affirmed by ex-situ XRD, FTIR, BET, SEM, and water contact angle analyses. Regarding, toluene adsorption-desorption investigation, ZSM-5/MCM-41 composite lead a longer stable toluene breakthrough time no matter under dry or 50% humid conditions. However, under different loading dosage condition, the breakthrough time of 75% coating ratio was the longest, which was 1.6 times as long as that of pure ZSM-5 under wet adsorption. Meanwhile, the complete elimination of toluene for ZSM-5/MCM-41-75% was done by largest desorption peak area and the lowest desorption temperature of 101.9°C, while, the largest contact angle of ZSM-5/MCM-41-75% was 17.0° higher than pure ZSM-5 zeolite. Therefore, we believe that the present hydrophobic sorbent will provide new insight with great research potential for removing low concentration of VOCs at industrial scale.
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Affiliation(s)
- Renna Li
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
| | - Shijia Chong
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
| | - Naveed Altaf
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
| | - Yanshan Gao
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
| | - Benoit Louis
- ICPEES - Institut de Chimie et Procédés pour l'Énergie, l'Environnement et la Santé, UMR 7515 CNRS - Université de Strasbourg, Strasbourg, France
| | - Qiang Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
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31
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Shen Y, Zhang N. Facile synthesis of porous carbons from silica-rich rice husk char for volatile organic compounds (VOCs) sorption. BIORESOURCE TECHNOLOGY 2019; 282:294-300. [PMID: 30875597 DOI: 10.1016/j.biortech.2019.03.025] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 06/09/2023]
Abstract
This work reported a facile synthesis of porous carbons from the silica-rich rice husk biochar via a ball-milling-assisted KOH activation for sorption of tar compounds and volatile organic compounds (VOCs) (i.e., toluene, phenol). The textural properties of activated biochars can be greatly influenced by the mass ratio of KOH and biochar. The high-performance biochar with a large specific surface area (SBET: 1818 m2/g) was produced as the mass ratio was 3. This activated biochar exhibited a hierarchically meso-microporous structure, which benefited for the adsorption process. Particularly, it had long breakthrough time of 2784 min and high adsorption capacity of 264 mg/g for toluene, while it had short breakthrough time of 724 min and low adsorption capacity of 6.53 mg/g for phenol. Significantly, the mixed VOCs of toluene and phenol can be effectively adsorbed. Further, thermal desorption will be an alternative route for regeneration of waste activated biochar.
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Affiliation(s)
- Yafei Shen
- School of Environmental Science and Engineering, Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, China.
| | - Niyu Zhang
- School of Environmental Science and Engineering, Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, China
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32
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Ojha DP, Song JH, Kim HJ. Facile synthesis of graphitic carbon-nitride supported antimony-doped tin oxide nanocomposite and its application for the adsorption of volatile organic compounds. J Environ Sci (China) 2019; 79:35-42. [PMID: 30784459 DOI: 10.1016/j.jes.2018.10.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 10/09/2018] [Accepted: 10/22/2018] [Indexed: 06/09/2023]
Abstract
Antimony-doped tin oxide (ATO) nanoparticles with an average size of ~ 6 nm were prepared by co-precipitation and subsequent heat treatment. Graphitic carbon nitride (g-CN)/ATO hybrid nanocomposite was designed by the combination of thermally synthesized g-CN and ATO nanoparticles by ultrasonication. The materials were characterized using N2 adsorption/desorption (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). A mixture of five volatile organic compounds (VOCs, chloroform, benzene, toluene, xylene and styrene) was used to compare the adsorption capacity of the samples. The adsorption capacity of ATO nanoparticles was improved by the addition of g-CN. Experimental data showed that, among the five VOCs, chloroform was the least adsorbed, regardless of the samples. The g-CN/ATO showed nearly three times greater adsorption capacity for the VOC mixture than pure ATO. The unchanged efficiency of VOC adsorption during cyclic use demonstrated the completely reversible adsorption and desorption behavior of the nanocomposite at room conditions. This economically and environmentally friendly material can be a practical solution for outdoor and indoor VOC removal.
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Affiliation(s)
- Devi Prashad Ojha
- Department of Convergence Technology Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Jun Hee Song
- Department of Convergence Technology Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Han Joo Kim
- Department of Convergence Technology Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea; Eco-friendly Machine Parts Design Center, Chonbuk National University, Jeonju 561-756, Republic of Korea.
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Laskar II, Hashisho Z, Phillips JH, Anderson JE, Nichols M. Modeling the Effect of Relative Humidity on Adsorption Dynamics of Volatile Organic Compound onto Activated Carbon. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:2647-2659. [PMID: 30730707 DOI: 10.1021/acs.est.8b05664] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A two-dimensional heterogeneous mathematical model was developed and validated to study the effect of relative humidity on volatile organic compound (VOC) adsorption onto activated carbon. The dynamic adsorption model consists of the macroscopic mass, momentum, and energy conservation equations and includes a multicomponent adsorption isotherm to predict the competitive adsorption equilibria between VOC and water vapor, which is described by an extended Manes method. Experimental verifications show that the model predicted the breakthrough profiles during competitive adsorption of the studied VOCs (2-propanol, acetone, n-butanol, toluene, 1,2,4-trimethylbenzene) at relative humidity range 0-95% with an overall mean relative absolute error (MRAE) of 11.8% for dry (0% RH) conditions and 17.2% for humid (55 and 95% RH) conditions, and normalized root-mean-square error (NRMSE) of 5.5 and 8.4% for dry and humid conditions, respectively. Sensitivity analysis was also conducted to test the robustness of the model in accounting for the impact of relative humidity on VOC adsorption by varying the adsorption temperature. Good agreement was observed between the experimental and simulated results with an overall MRAE of 12.4 and 7.1% for the breakthrough profiles and adsorption capacity, respectively. The model can be used to quantify the impact of carrier gas relative humidity during adsorption of contaminants from gas streams, which is useful when optimizing adsorber design and operating conditions.
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Affiliation(s)
- Imranul I Laskar
- Department of Civil and Environmental Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Zaher Hashisho
- Department of Civil and Environmental Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - John H Phillips
- Environmental Quality Office , Ford Motor Company , Dearborn , Michigan 48126 , United States
| | - James E Anderson
- Research and Advanced Engineering , Ford Motor Company , Dearborn , Michigan 48121 , United States
| | - Mark Nichols
- Research and Advanced Engineering , Ford Motor Company , Dearborn , Michigan 48121 , United States
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Zhang X, Gao B, Fang J, Zou W, Dong L, Cao C, Zhang J, Li Y, Wang H. Chemically activated hydrochar as an effective adsorbent for volatile organic compounds (VOCs). CHEMOSPHERE 2019; 218:680-686. [PMID: 30504043 DOI: 10.1016/j.chemosphere.2018.11.144] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/09/2018] [Accepted: 11/22/2018] [Indexed: 06/09/2023]
Abstract
Hydrochars derived from hickory wood and peanut hull through hydrothermal carbonization were activated with H3PO4 and KOH to improve their performance as a volatile organic compound (VOC) adsorbent. Polar acetone and nonpolar cyclohexane were used as representative VOCs. The VOC adsorptive capacities of the activated hydrochars (50.57-159.66 mg⋅g-1) were greater than that of the nonactivated hydrochars (15.98-25.36 mg⋅g-1), which was mainly caused by the enlargement of surface area. The significant linear correlation (R2 = 0.984 on acetone, and R2 = 0.869 on cyclohexane) between BET surface areas of hydrochars and their VOC adsorption capacities, together with the obvious adsorption exothermal peak of differential scanning calorimetry curve confirmed physical adsorption as the dominating mechanism. Finally, the reusability of activated hydrochar was tested on H3PO4 activated hickory hydrochar (HHP), which had higher acetone and cyclohexane adsorption capacities. After five continuous adsorption desorption cycles, the adsorptive capacities of acetone and cyclohexane on HHP decreased by 6.2% and 7.8%, respectively. The slight decline in adsorption capacity confirmed the reusability of activated hydrochar as a VOC sorbent.
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Affiliation(s)
- Xueyang Zhang
- School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou 221018, China; Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA; Jiangsu Key Laboratory of Environmental Material and Environmental Engineering, Yangzhou University, Yangzhou 225009, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA.
| | - June Fang
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Weixin Zou
- Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA; Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Lin Dong
- Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China; Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Chengcheng Cao
- School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou 221018, China
| | - Jian Zhang
- Jiangsu Key Laboratory of Environmental Material and Environmental Engineering, Yangzhou University, Yangzhou 225009, China
| | - Yuncong Li
- Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA
| | - Hailong Wang
- School of Environment and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China; School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou, Zhejiang 311300, China
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35
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Liu X, Chen L, Zhu T, Ning R. Catalytic oxidation of chlorobenzene over noble metals (Pd, Pt, Ru, Rh) and the distributions of polychlorinated by-products. JOURNAL OF HAZARDOUS MATERIALS 2019; 363:90-98. [PMID: 30308369 DOI: 10.1016/j.jhazmat.2018.09.074] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
Catalytic oxidation of chlorobenzene over noble metal catalysts Pd/TiO2, Pt/TiO2, Ru/TiO2, and Rh/TiO2 was evaluated, and Ru/TiO2 contributed the highest catalytic activity and CO2 selectivity. During the oxidation, polychlorinated benzenes PhClx (x ≥ 2) were observed, and Ru/TiO2 showed apparently lower PhClx concentrations than other three samples. With the improvement of temperature, the maximum concentration appeared in the sequence of dichlorobenzene (PhCl2), trichlorobenzene (PhCl3), tetrachlorobenzene (PhCl4), and pentchlorobenzene (PhCl5), whereas the concentration of hexachlorobenzene (PhCl6) was always low and showed no apparent regularity. Besides, the dioxin-like PCBs (dl-PCBs) were collected and analyzed for Pd/TiO2 and Ru/TiO2. The ∑dl-PCBs produced by Pd/TiO2 (0.0055 ng WHO-TEQ/Nm3) was about 1.5 times that of Ru/TiO2 (0.0027 ng WHO-TEQ/Nm3). XPS analyses revealed that Ru/TiO2-used and Rh/TiO2-used gave the lowest and the highest Cl content of 0.61% and 1.87%. Ru/TiO2-used afforded the lowest (Clad+Clor)/Cl value (22.1%) and the highest Clbr/Cl value (77.9%), which might be an important reason for its strongest chlorine removal ability and the lowest yields of polychlorinated by-products, whereas other three catalysts showed similarity in the Cl distributions. Additionally, systematic in-situ FTIR studies were conducted, and a reaction mechanism for the catalytic oxidation of chlorobenzene was proposed.
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Affiliation(s)
- Xiaolong Liu
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
| | - Li Chen
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Tingyu Zhu
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| | - Ruliang Ning
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China
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36
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Fu S, Zheng Y, Zhou X, Ni Z, Xia S. Visible light promoted degradation of gaseous volatile organic compounds catalyzed by Au supported layered double hydroxides: Influencing factors, kinetics and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2019; 363:41-54. [PMID: 30300777 DOI: 10.1016/j.jhazmat.2018.10.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 09/18/2018] [Accepted: 10/03/2018] [Indexed: 05/09/2023]
Abstract
In this paper, factors of initial concentration, catalyst dosage, irradiation intensity, relative humidity and reaction temperature onto visible light gaseous o-xylene photodegradation by ZnCr layered double hydroxides (ZnCr-LDHs) and Au supported ZnCr-LDHs (Au/ZnCr-LDHs) were investigated. ZnCr-LDHs shows low removal efficiency for o-xylene photodegradation, while Au/ZnCr-LDHs exhibits both excellent photodegradation rate and high TOF values for o-xylene as well as other VOCs including benzene, o-xylene, m-xylene and p-xylene. The kinetic equation and activation energy were calculated for o-xylene photodegradation, which are [Formula: see text] and 21.85 kJ/mol for ZnCr-LDH [Formula: see text] and 12.84 kJ/mol for Au/ZnCr-LDHs. The obvious difference both in kinetic equation and activation energy suggests the reaction mechanism of ZnCr-LDHs and Au/ZnCr-LDHs should be very different. The active species inhabitation experiments show that the major drive of photocatalytic reaction for ZnCr-LDHs is hydroxyl radical, while for Au/ZnCr-LDHs it is the hole and hydroxide radical. It is also proved that the support of Au NPs onto LDHs would result in the transfer of photoexcited electrons from LDHs to Au NPs which results in the enhancement of photocatalytic property as well as photocatalytic mechanism change based on UV-vis, XPS, the contribution of different wavelength ranges of visible light onto photocatalytic efficiency and electrochemical tests.
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Affiliation(s)
- Shifeng Fu
- College of Water Conservancy and Hydropower Engineering, Hohai University, 1 Xikang Road, Nanjing, 210024, PR China
| | - Yuan Zheng
- College of Water Conservancy and Hydropower Engineering, Hohai University, 1 Xikang Road, Nanjing, 210024, PR China
| | - Xiaobo Zhou
- Entegris, Inc., 129 Concord Road, Billerica, MA, 01821, USA
| | - Zheming Ni
- Department of Chemistry, College of Chemical Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, PR China
| | - Shengjie Xia
- Department of Chemistry, College of Chemical Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, PR China.
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37
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Zhou H, Gao S, Zhang W, An Z, Chen D. Dynamic adsorption of toluene on amino-functionalized SBA-15 type spherical mesoporous silica. RSC Adv 2019; 9:7196-7202. [PMID: 35519950 PMCID: PMC9061090 DOI: 10.1039/c8ra08605b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 02/18/2019] [Indexed: 11/21/2022] Open
Abstract
Amino-functionalized spherical mesoporous silicas were successfully prepared via a convenient treatment method by using APTES, which was used for the adsorption treatment of toluene gas, showing obvious advantages.
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Affiliation(s)
- Huiping Zhou
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Shaomin Gao
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Wenwen Zhang
- College of Environmental Science and Engineering
- Donghua University
- Shanghai
- PR China
| | - Zhaohui An
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Donghui Chen
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
- College of Environmental Science and Engineering
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38
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Li R, Xue T, Bingre R, Gao Y, Louis B, Wang Q. Microporous Zeolite@Vertically Aligned Mg-Al Layered Double Hydroxide Core@Shell Structures with Improved Hydrophobicity and Toluene Adsorption Capacity under Wet Conditions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34834-34839. [PMID: 30277743 DOI: 10.1021/acsami.8b15118] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Zeolites have been recognized as one type of the most promising adsorbents for capturing volatile organic compounds (VOCs, e.g., toluene), but their performance suffers severely from water vapor under wet conditions. In this contribution, we demonstrated that the hydrophobicity of microporous zeolites can be significantly improved by coating vertically aligned LDH nanoplatelets when the contact angle is increased from 16.5-20.1° to 44.4-64.2°. The toluene adsorption capacity of such synthesized zeolite@LDH core@shell composites in wet conditions can thus be largely enhanced when the breakthrough time is increased from 6.4-10.8 to 20.1-27.5 min.
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Affiliation(s)
- Renna Li
- College of Environmental Science and Engineering , Beijing Forestry University , 35 Qinghua East Road , Haidian District, Beijing 100083 , P. R. China
| | - Tianshan Xue
- College of Environmental Science and Engineering , Beijing Forestry University , 35 Qinghua East Road , Haidian District, Beijing 100083 , P. R. China
| | - Rogeria Bingre
- ICPEES - Institut de Chimie et Procédés pour l'Énergie, l'Environnement et la Santé , UMR 7515 CNRS-Université de Strasbourg , 25 rue Becquerel , Strasbourg cedex 2 67087 , France
| | - Yanshan Gao
- College of Environmental Science and Engineering , Beijing Forestry University , 35 Qinghua East Road , Haidian District, Beijing 100083 , P. R. China
| | - Benoit Louis
- ICPEES - Institut de Chimie et Procédés pour l'Énergie, l'Environnement et la Santé , UMR 7515 CNRS-Université de Strasbourg , 25 rue Becquerel , Strasbourg cedex 2 67087 , France
| | - Qiang Wang
- College of Environmental Science and Engineering , Beijing Forestry University , 35 Qinghua East Road , Haidian District, Beijing 100083 , P. R. China
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Li J, Wang Y, Tian Y, He X, Yang P, Yuan M, Cao Y, Lyu J. Crystallization of microporous TiO 2 through photochemical deposition of Pt for photocatalytic degradation of volatile organic compounds. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:15662-15670. [PMID: 29574642 DOI: 10.1007/s11356-018-1767-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 03/13/2018] [Indexed: 06/08/2023]
Abstract
The photocatalytic mineralization efficiency of volatile organic compounds (VOCs) is determined by adsorption of reactants, separation of charge carriers, and reaction activity of catalyst surface. Herein, we provide a strategy to synthesize a novel catalyst, namely, PhPt-Micro, which is characterized by high adsorption ability, charge separation efficiency, and surface reaction activity. Toluene was chosen as the model VOC. The effects of photochemical deposition of Pt on the physical properties of microporous amorphous TiO2 (Micro) and toluene mineralization were studied using N2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) analyses. After photochemical treatment, the structure of Micro was optimized, and Pt nanoparticles were successfully deposited at the outlet of electrons on the catalyst surface. SPS result proved that the optimized structure enhanced the separation efficiency of charge carriers and the migration of photo-generated electrons to the PhPt-Micro surface. The quasi-equilibrium adsorption amount of toluene over PhPt-Micro was two times higher than that with commercial nano TiO2 (P25). The micropores concentrated toluene on the catalyst surface and hindered intermediate desorption. The mineralization efficiency of toluene over PhPt-Micro was 2.4 and 5.9 times higher than those over Micro and P25, respectively.
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Affiliation(s)
- Ji Li
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Yanhong Wang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Yiyuan Tian
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Xuan He
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Pingping Yang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Minghui Yuan
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Yuqing Cao
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Jinze Lyu
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, China.
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China.
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40
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Li L, Ma X, Chen R, Wang C, Lu M. Nitrogen-Containing Functional Groups-Facilitated Acetone Adsorption by ZIF-8-Derived Porous Carbon. MATERIALS 2018; 11:ma11010159. [PMID: 29351217 PMCID: PMC5793657 DOI: 10.3390/ma11010159] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/17/2018] [Accepted: 01/18/2018] [Indexed: 11/26/2022]
Abstract
Nitrogen-doped porous carbon (ZC) is prepared by modification with ammonia for increasing the specific surface area and surface polarity after carbonization of zeolite imidazole framework-8 (ZIF-8). The structure and properties of these ZCs were characterized by Transmission electron microscopy, X-ray diffraction, N2 sorption, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Through static adsorption tests of these carbons, the sample obtained at 600 °C was selected as an excellent adsorbent, which exhibited an excellent acetone capacity of 417.2 mg g−1 (25 °C) with a very large surface area and high-level nitrogen doping (13.55%). The microporosity, surface area and N-containing groups of the materials, pyrrolic-N, pyridinic-N, and oxidized-N groups in particular, were found to be the determining factors for acetone adsorption by means of molecular simulation with density functional theory. These findings indicate that N-doped microporous carbon materials are potential promising adsorbents for acetone.
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Affiliation(s)
- Liqing Li
- School of Energy Science and Engineering, Central South University, Changsha 410083, China.
| | - Xiancheng Ma
- School of Energy Science and Engineering, Central South University, Changsha 410083, China.
| | - Ruofei Chen
- School of Energy Science and Engineering, Central South University, Changsha 410083, China.
| | - Chunhao Wang
- School of Energy Science and Engineering, Central South University, Changsha 410083, China.
| | - Mingming Lu
- College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH 45221, USA.
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41
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Zhou K, Li L, Ma X, Mo Y, Chen R, Li H, Li H. Activated carbons modified by magnesium oxide as highly efficient sorbents for acetone. RSC Adv 2018; 8:2922-2932. [PMID: 35541210 PMCID: PMC9077576 DOI: 10.1039/c7ra11740j] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 01/09/2018] [Indexed: 01/29/2023] Open
Abstract
Porous activated carbon modified with MgO was synthesized by an evaporation-induced self-assembly (EISA) method for its application to acetone capture. The textural and chemical characteristics of five modified activated carbon composites (AC-MgO) were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption isotherm measurements. The adsorption behaviors of samples for acetone were investigated and correlated to their physical and chemical properties. Density functional theory was also employed to calculate the charge transfer, the equilibrium distance, and the adsorption energy of acetone adsorbed on a carbon surface functionalized with crystalline MgO. An AC-MgO-10% sample with balanced surface area, microporosity and MgO content exhibited the highest acetone adsorption capacity (432.7 mg g-1). The results indicate that an appropriate MgO content on AC can effectively improve the adsorption capacity of acetone ascribed to strong chemisorption between MgO nanoparticles and acetone molecules.
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Affiliation(s)
- Ke Zhou
- School of Energy Science and Engineering, Central South University Changsha 410083 Hunan China +86 13807483619
| | - Liqing Li
- School of Energy Science and Engineering, Central South University Changsha 410083 Hunan China +86 13807483619
| | - Xiancheng Ma
- School of Energy Science and Engineering, Central South University Changsha 410083 Hunan China +86 13807483619
| | - Yamian Mo
- School of Energy Science and Engineering, Central South University Changsha 410083 Hunan China +86 13807483619
| | - Ruofei Chen
- School of Energy Science and Engineering, Central South University Changsha 410083 Hunan China +86 13807483619
| | - Hailong Li
- School of Energy Science and Engineering, Central South University Changsha 410083 Hunan China +86 13807483619
| | - Haoyang Li
- School of Materials Science and Engineering, Central South University Changsha 410083 Hunan China
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42
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Zhang X, Gao B, Zheng Y, Hu X, Creamer AE, Annable MD, Li Y. Biochar for volatile organic compound (VOC) removal: Sorption performance and governing mechanisms. BIORESOURCE TECHNOLOGY 2017; 245:606-614. [PMID: 28910648 DOI: 10.1016/j.biortech.2017.09.025] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 09/01/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
Sorption is one of the most efficient and low cost strategies for volatile organic compound (VOC) removal, but VOC sorption by biochar has seen limited research. In this work, gas phase sorption experiments were conducted to determine the sorption potential and mechanisms of VOCs onto biochar. A total of 15 biochars produced from 5 common feedstocks at 300, 450, and 600°C were evaluated as sorbents. Three common VOCs (acetone, cyclohexane, and toluene) were chosen as sorbates. The results showed that all the tested biochars had VOC sorption capacity in the range of 5.58-91.2mgg-1. The sorption capacities were mainly influenced by both the surface area of biochar and its noncarbonized organic matter content. The vapor sorption process was exothermic, and the removal of VOCs by the biochars decreased with increasing feedstock temperature. Both the physical adsorption and partition mechanisms played important roles in controlling the VOC removal by the biochars. Biochar maintained its VOC removal ability after five consecutive sorption-desorption cycles, which indicated good reusability. Findings of this work suggest that biochar is a promising alternative sorbent for gaseous VOC removal.
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Affiliation(s)
- Xueyang Zhang
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221000, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle (Nanchang HangKong University), Nanchang 330063, PR China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA.
| | - Yulin Zheng
- Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL 32611, USA
| | - Xin Hu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering and Center of Material Analysis, 20 Hankou Road, Nanjing University, Nanjing 210093, PR China
| | - Anne Elise Creamer
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221000, PR China
| | - Michael D Annable
- Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL 32611, USA
| | - Yuncong Li
- Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA
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43
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Saini VK, Pires J. Development of metal organic fromwork-199 immobilized zeolite foam for adsorption of common indoor VOCs. J Environ Sci (China) 2017; 55:321-330. [PMID: 28477827 DOI: 10.1016/j.jes.2016.09.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 07/09/2016] [Accepted: 09/07/2016] [Indexed: 06/07/2023]
Abstract
Reticulated foam shaped adsorbents are more efficient for the removal of volatile organic compounds (VOCs), particularly from low VOC-concentration indoor air streams. In this study composite structure of zeolite and metal organic frameworks (MOFs), referred as ZMF, has been fabricated by immobilization of fine MOF-199 powder on foam shaped Zeolite Socony Mobil-5 (ZSM-5) Zeolitic structure, referred as ZF. The ZMF possess a uniform and well-dispersed coating of MOF-199 on the porous framework of ZF. It shows higher surface area, pore volume, and VOCs adsorption capacity, as compared to ZF-structure. Post-fabrication changes in selective adsorption properties of ZMF were studied with three common indoor VOCs (benzene, n-hexane, and cyclohexane), using gravimetric adsorption technique. The adsorption capacity of ZMF with different VOCs follow the order of benzene>n-hexane>cyclohexane. In comparison with MOF-199 and ZF, the composite structure ZMF shows improvement in selectivity for benzene from other two VOCs. Further, improvement in efficiency and stability of prepared ZMF was found to be associated with its high MOF loading capacity and unique morphological and structural properties. The developed composite structure with improved VOCs removal and recyclability could be a promising material for small to limited scale air pollution treatment units.
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Affiliation(s)
- Vipin K Saini
- School of Environment and Natural Resources, Doon University, Dehradun 248001, India; Department of Chemistry and Biochemistry, Faculty of Sciences, University of Lisbon, Lisbon 1749-016, Portugal.
| | - João Pires
- Department of Chemistry and Biochemistry, Faculty of Sciences, University of Lisbon, Lisbon 1749-016, Portugal
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44
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Saffarionpour S, Sevillano DM, Van der Wielen LA, Noordman TR, Brouwer E, Ottens M. Selective adsorption of flavor-active components on hydrophobic resins. J Chromatogr A 2016; 1476:25-34. [DOI: 10.1016/j.chroma.2016.10.053] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/13/2016] [Accepted: 10/23/2016] [Indexed: 11/17/2022]
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45
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Cho JH, Lee S, Rhee YW. Activated Carbon Adsorption Characteristics of Multi-component Volatile Organic compounds in a Fixed Bed Adsorption Bed. KOREAN CHEMICAL ENGINEERING RESEARCH 2016. [DOI: 10.9713/kcer.2016.54.2.239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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46
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Campesi MA, Luzi CD, Barreto GF, Martínez OM. Evaluation of an adsorption system to concentrate VOC in air streams prior to catalytic incineration. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2015; 154:216-24. [PMID: 25734958 DOI: 10.1016/j.jenvman.2015.02.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 02/13/2015] [Accepted: 02/14/2015] [Indexed: 05/27/2023]
Abstract
Catalytic combustion is a well-developed process for the removal of volatile organic compounds (VOCs). In order to reduce both the amount of catalyst needed for incineration and the surface area of recuperative heat exchangers, an evaluation of the use of thermal swing adsorption as a previous step for VOC concentration is made. An air stream containing ethyl acetate and ethanol (employed as solvents in printing processes) has been taken as a case study. Based on the characteristics of the adsorption/desorption system and the properties of the stream to be treated, a monolithic rotor concentrator with activated carbon as adsorbent material is adopted. Once the temperature of the inlet desorption stream TD is chosen, the minimum possible desorption flow rate, WD,min, and the amount of adsorbent material can be properly defined according to the extent of the Mass Transfer Zone (MTZ) at the end of the adsorption stage. An approximate procedure to speed up the calculations needed for sizing the bed and predicting the operating variables is also presented. In the case studied here, the concentration of the VOC stream can reach 6 times that of the primary effluent when TD = 200 °C is chosen.
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Affiliation(s)
- María A Campesi
- Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de La Plata (UNLP) 1 y 47, CP 1900 La Plata, Argentina; CINDECA, CCT La Plata (CONICET-UNLP), Calle 47 Nº 257, CP B1900AJK La Plata, Argentina
| | - Carlos D Luzi
- Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de La Plata (UNLP) 1 y 47, CP 1900 La Plata, Argentina; CINDECA, CCT La Plata (CONICET-UNLP), Calle 47 Nº 257, CP B1900AJK La Plata, Argentina
| | - Guillermo F Barreto
- Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de La Plata (UNLP) 1 y 47, CP 1900 La Plata, Argentina; CINDECA, CCT La Plata (CONICET-UNLP), Calle 47 Nº 257, CP B1900AJK La Plata, Argentina
| | - Osvaldo M Martínez
- Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad Nacional de La Plata (UNLP) 1 y 47, CP 1900 La Plata, Argentina; CINDECA, CCT La Plata (CONICET-UNLP), Calle 47 Nº 257, CP B1900AJK La Plata, Argentina.
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47
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Wang G, Zhang Z, Wang J, Li N, Hao Z. Study of the Influence of Pore Width on the Disposal of Benzene Employing Tunable OMCs. Ind Eng Chem Res 2015. [DOI: 10.1021/ie5037325] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gang Wang
- Research Center for Eco-Environmental
Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhongshen Zhang
- Research Center for Eco-Environmental
Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Junhui Wang
- Research Center for Eco-Environmental
Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Na Li
- Research Center for Eco-Environmental
Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhengping Hao
- Research Center for Eco-Environmental
Sciences, Chinese Academy of Sciences, Beijing 100085, China
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48
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Liu X, Wang J, Zeng J, Wang X, Zhu T. Catalytic oxidation of toluene over a porous Co3O4-supported ruthenium catalyst. RSC Adv 2015. [DOI: 10.1039/c5ra07072d] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Porous Co3O4-MOF and Ru/Co3O4-MOF were prepared and applied in the catalytic oxidation of toluene. Ru/Co3O4-MOF showed higher catalytic performance than other materials. The stability and water-resistence of the catalyst were also studied.
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Affiliation(s)
- Xiaolong Liu
- Beijing Engineering Research Center of Process Pollution Control
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
| | - Jian Wang
- Beijing Engineering Research Center of Process Pollution Control
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
| | - Junlin Zeng
- Beijing Engineering Research Center of Process Pollution Control
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
| | - Xue Wang
- Beijing Engineering Research Center of Process Pollution Control
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
| | - Tingyu Zhu
- Beijing Engineering Research Center of Process Pollution Control
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
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49
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Long Y, Li Q, Ni J, Xu F, Xu H. Treatment of metal wastewater in pilot-scale packed bed systems: efficiency of single- vs. mixed-mushrooms. RSC Adv 2015. [DOI: 10.1039/c5ra02409a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study investigated the biosorption of heavy metals from industrial wastewater using mushrooms at small-sized pilot-scale.
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Affiliation(s)
- Yunchuan Long
- Key Laboratory of Bio-resources and Eco-environment (Ministry of Education)
- College of Life Science
- Sichuan University
- Chengdu
- China
| | - Qiao Li
- Key Laboratory of Bio-resources and Eco-environment (Ministry of Education)
- College of Life Science
- Sichuan University
- Chengdu
- China
| | - Jiangxia Ni
- Key Laboratory of Bio-resources and Eco-environment (Ministry of Education)
- College of Life Science
- Sichuan University
- Chengdu
- China
| | - Fei Xu
- Key Laboratory of Bio-resources and Eco-environment (Ministry of Education)
- College of Life Science
- Sichuan University
- Chengdu
- China
| | - Heng Xu
- Key Laboratory of Bio-resources and Eco-environment (Ministry of Education)
- College of Life Science
- Sichuan University
- Chengdu
- China
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