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Liu Z, Li X, He W, Zhao G, Yang Y, Liu X, Zhang X, Li X, Zhang S, Sun W, Lu G. Synergistic effect of charge and strain engineering on porous g-C9N7 nanosheets for highly controllable CO2 capture and separation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120135] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Shi R, Liu K, Liu B, Chen H, Xu X, Ren Y, Qiu J, Zeng Z, Li L. New insight into toluene adsorption mechanism of melamine urea-formaldehyde resin based porous carbon: Experiment and theory calculation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127600] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Qu P, Li Y, Huang H, Chen J, Yu Z, Huang J, Wang H, Gao B. Urea formaldehyde modified alginate beads with improved stability and enhanced removal of Pb 2+, Cd 2+, and Cu 2. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122664. [PMID: 32339875 DOI: 10.1016/j.jhazmat.2020.122664] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/23/2020] [Accepted: 04/04/2020] [Indexed: 06/11/2023]
Abstract
Urea formaldehyde (UF) was grafted onto the backbone of alginate to prepare microbeads as an adsorbent for the removal of heavy metal ions from aqueous solutions. The expensive alginate was crosslinked with cheaper UF at different ratios (1: 2.5∼1: 12.5) to produce sturdy alginate-UF beads at lower cost. Characterization results showed that UF modification enhanced the pore network and structural stability of the beads, which can be attributed to the reduced intermolecular forces and plentiful of nitrogen and oxygen donor atoms of the beads. The swelling of air-dried alginate-UF beads in different solutions was much lower than that of the unmodified alginate beads, confirming the improved stability. The replacement of alginate with UF at different ratios either did not affect or increased the adsorption of heavy metal ions (Pb2+, Cd2+, and Cu2+) on the beads. For example, the adsorption capacities of Pb2+, Cd2+, and Cu2+ on air-dried alginate-UF (1: 2.5) beads were 1.66, 0.61, and 0.80 mmol/g, which were 39.88%, 9.29%, and 9.52% higher than those of the corresponding unmodified alginate beads, respectively. The adsorption of heavy metals on the alginate-UF beads was mainly controlled by ion exchange, complexation, and electrostatic interaction mechanisms.
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Affiliation(s)
- Ping Qu
- Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Key laboratory of Crop and livestock Integrated Farming, Ministry of Agriculture, Nanjing, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing, Jiangsu Province, 210014, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32606, USA; Soil and Water Science Department, Tropical Research and Education Center, University of Florida, Homestead, FL, 33031, USA
| | - Yuncong Li
- Soil and Water Science Department, Tropical Research and Education Center, University of Florida, Homestead, FL, 33031, USA
| | - Hongying Huang
- Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Key laboratory of Crop and livestock Integrated Farming, Ministry of Agriculture, Nanjing, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing, Jiangsu Province, 210014, China
| | - Jianjun Chen
- Mid-Florida Research & Education Center, University of Florida, Apopka, FL, 32703, USA
| | - Zebin Yu
- School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China
| | - Jun Huang
- Hualan Design & Consulting Group Co. Ltd., Nanning, 530011, China; College of Civil Engineering and Architecture Guangxi University, Nanning, 530004, China
| | - Hailong Wang
- School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong, 528000, China; Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32606, USA.
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Qu P, Li Y, Huang H, Wu G, Chen J, He F, Wang H, Gao B. Foamed urea-formaldehyde microspheres for removal of heavy metals from aqueous solutions. CHEMOSPHERE 2020; 241:125004. [PMID: 31590025 DOI: 10.1016/j.chemosphere.2019.125004] [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: 08/23/2019] [Revised: 09/25/2019] [Accepted: 09/27/2019] [Indexed: 06/10/2023]
Abstract
A simple foaming method was applied to fabricate urea formaldehyde (UF) microspheres with cross-linked porous structures for environmental remediation of heavy metals. The specific surface area and average pore radius of the resultant foamed UF microspheres were 11-29 m2/g and 11-25 nm, respectively, which increased with the increasing molar ratio of formaldehyde to urea. All the foamed UF microspheres showed good removal of heavy metals ions (Pb(II), Cu(II), and Cd(II)) in both single- and mixed-metal solutions. Further investigations of Pb(II) adsorption on a selected UF microspheres showed fast kinetics and relatively high adsorption capacity (21.5 mg/g), which can be attributed to the mesoporous structure and abundance of oxygen surface functional groups of the microspheres. Both experimental and model results showed that chelation or complexation interactions between Pb(II) and the surface functional groups were responsible to the strong adsorption of the heavy metal ions on the microspheres. Hydrochloric acid (0.05 M) successfully desorbed Pb(II) from the post-adsorption microspheres for multiple times and the regenerated microspheres showed high Pb(II) removal rates (>96%) in five adsorption-desorption cycles. With many promising advantages, foamed UF microspheres show great potential as a wastewater treatment agent for heavy metal removal.
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Affiliation(s)
- Ping Qu
- Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture, Nanjing, PR China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, USA; Soil and Water Science Department, Tropical Research and Education Center, University of Florida, Homestead, FL, USA
| | - Yuncong Li
- Soil and Water Science Department, Tropical Research and Education Center, University of Florida, Homestead, FL, USA
| | - Hongying Huang
- Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture, Nanjing, PR China
| | - Guofeng Wu
- Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture, Nanjing, PR China
| | - Jianjun Chen
- Mid-Florida Research & Education Center, University of Florida, Apopka, FL, 32703, USA
| | - Feng He
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Hailong Wang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, China; Biochar Engineering Technology Research Center of Guangdong Province, School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong, 528000, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, USA.
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Effect of Ammonia Activation and Chemical Vapor Deposition on the Physicochemical Structure of Activated Carbons for CO2 Adsorption. Processes (Basel) 2019. [DOI: 10.3390/pr7110801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Focusing on the bottlenecks of traditional physical activation method for the preparation of activated carbons (ACs), we established a simple and scalable method to control the physicochemical structure of ACs and study their CO2 adsorption performance. The preparation is achieved by ammonia activation at different volume fractions of ammonia in the mixture (10%, 25%, 50%, 75%, and 100%) to introduce the nitrogen-containing functional groups and form the original pores and subsequent chemical vapor deposition (CVD) at different deposition times (30, 60, 90, and 120 min) to further adjust the pore structure. The nitrogen content of ACs-0.1/0.25/0.5/0.75/1 increases gradually from 2.11% to 8.84% with the increase of ammonia ratio in the mixture from 10% to 75% and then decreases to 3.02% in the process of pure ammonia activation (100%), during which the relative content of pyridinium nitrogen (N-6), pyrrolidine (N-5), and graphite nitrogen (N-Q) increase sequentially but nitrogen oxygen structure (N-O) increase continuously. In addition, ACs-0.5 and ACs-0.75, with a relatively high nitrogen content (6.37% and 8.84%) and SBET value (1048.65 m2/g and 814.36 m2/g), are selected as typical samples for subsequent CVD. In the stage of CVD, ACs-0.5-60 and ACs-0.75-90, with high SBET (1897.25 and 1971.57 m2/g) value and an appropriate pore-size distribution between 0.5 and 0.8 nm, can be obtained with the extension of deposition time from 60 to 90 min. The results of CO2 adsorption test indicate that an adsorption capacity of ACs-0.75-90, at 800 mmHg, is the largest (6.87 mmol/g) out of all the tested samples. In addition, the comparison of CO2 adsorption performance of tested samples with different nitrogen content and pore structure indicates that the effect of nitrogen content seems to be more pronounced in this work.
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Kaur B, Singh J, Gupta RK, Bhunia H. Porous carbons derived from polyethylene terephthalate (PET) waste for CO 2 capture studies. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 242:68-80. [PMID: 31028953 DOI: 10.1016/j.jenvman.2019.04.077] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 03/05/2019] [Accepted: 04/19/2019] [Indexed: 06/09/2023]
Abstract
Oxygen augmented carbon adsorbent has been developed using polyethylene terephthalate (PET) waste by first carbonizing at different temperatures (500-800 °C) and then chemically activating using different ratios of KOH: PET (mass ratio 1 to 4). The textural characterization divulges the effect of activation in terms of the development of the high surface area and micropore volume of 1690 m2 g-1 and 0.78 cm3 g-1 respectively, for the optimum sample (PET-3-700). Elemental analysis of PET-3-700 illustrates the presence of 34.33% oxygen and XPS results confirmed the occurrence of oxygen moieties which enhance the basicity of the adsorbent and promote CO2 capture. The CO2 adsorption capacity of prepared carbons was determined thermogravimetrically under dynamic conditions, at different concentrations of CO2 (6-100%) and temperatures. The maximum CO2 uptake capacity of 2.31 mmol g-1 was exhibited by PET-3-700 at an adsorption temperature of 30 °C under 100% pure CO2 flow. Four adsorption-desorption cycles corroborate almost complete regenerability of the prepared adsorbent. Adsorption kinetics at all adsorption conditions was described best by fractional order kinetic model. Freundlich isotherm fit indicates the surface of adsorbent being heterogeneous and low values of isosteric heat shows physisorption behavior of the process. Negative values of thermodynamic parameters indicate exothermic and feasible nature of adsorption process.
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Affiliation(s)
- Balpreet Kaur
- Department of Chemical Engineering, Thapar Institute of Engineering and Technology (Deemed to be University), Patiala, 147004, Punjab, India.
| | - Jasminder Singh
- School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology (Deemed to be University), Patiala, 147004, Punjab, India.
| | - Raj Kumar Gupta
- Department of Chemical Engineering, Thapar Institute of Engineering and Technology (Deemed to be University), Patiala, 147004, Punjab, India.
| | - Haripada Bhunia
- Department of Chemical Engineering, Thapar Institute of Engineering and Technology (Deemed to be University), Patiala, 147004, Punjab, India.
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Lin YS, Lin Y, Periasamy AP, Cang J, Chang HT. Parameters affecting the synthesis of carbon dots for quantitation of copper ions. NANOSCALE ADVANCES 2019; 1:2553-2561. [PMID: 36132712 PMCID: PMC9419006 DOI: 10.1039/c9na00137a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 05/10/2019] [Indexed: 05/20/2023]
Abstract
A simple, eco-friendly, and low-cost electrochemical approach has been applied to the synthesis of carbon dots (C dots) from histidine hydrochloride in the absence or presence of halides (Cl, Br, and I) at various potentials up to 10 V. The as-formed C dots refer to C dots, Cl-C, Br-C, and I-C dots. The time-evolution UV-vis absorption and photoluminescence (PL) spectra provide more detailed information about the formation of C dots. Upon increasing the reaction time from 1 to 120 min, more and more C dots are formed, leading to increased PL intensity. The halides play two important roles in determining the formation of C dots; controlling the reaction rate and surface states. When compared to chloride and bromide, iodide has a greater effect on varying surface states and inducing PL quenching through intersystem crossing. The PL intensities of the four types of C dots all decrease upon increasing Cu2+, Hg2+, and Ag+ concentrations. In the presence of 0.8 mM I-, I-C dots compared to C dots, Cl-C dots, and Br-C dots are slightly better for quantitation of Cu2+. Fourier transform infrared spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy results of I-C dots reveal the interactions of Cu2+ with the surface ligands (imidazole and histidine). The I-C dot probe in the presence of 0.8 mM I- is selective toward Cu2+ over the tested metal ions such as Hg2+ and Ag+. The assay provides a limit of detection of 0.22 μM for Cu2+ at a signal-to-noise ratio of 3. Practicality of this probe has been validated by the analyses of tap, lake, and sea water samples, with negligible matrix effects.
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Affiliation(s)
- Yu-Syuan Lin
- Department of Chemistry, National Taiwan University Taipei 10617 Taiwan
| | - Yaling Lin
- Department of Chemistry, National Taiwan University Taipei 10617 Taiwan
| | | | - Jinshun Cang
- Department of Chemical Engineering, Yancheng Institute of Industry Technology Yancheng Jiangsu 224005 China
| | - Huan-Tsung Chang
- Department of Chemistry, National Taiwan University Taipei 10617 Taiwan
- Department of Chemistry, Chung Yuan Christian University Taoyuan City 32023 Taiwan
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Tiwari D, Bhunia H, Bajpai PK. Development of chemically activated N-enriched carbon adsorbents from urea-formaldehyde resin for CO 2 adsorption: Kinetics, isotherm, and thermodynamics. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 218:579-592. [PMID: 29715667 DOI: 10.1016/j.jenvman.2018.04.088] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 04/11/2018] [Accepted: 04/20/2018] [Indexed: 06/08/2023]
Abstract
Nitrogen enriched carbon adsorbents with high surface areas were successfully prepared by carbonizing the low-cost urea formaldehyde resin, followed by KOH activation. Different characterization techniques were used to determine the structure and surface functional groups. Maximum surface area and total pore volume of 4547 m2 g-1 and 4.50 cm3 g-1 were found by controlling activation conditions. The optimized sample denoted as UFA-3-973 possesses a remarkable surface area, which is found to be one of the best surface areas achieved so far. Nitrogen content of this sample was found to be 22.32%. Dynamic CO2 uptake capacity of the carbon adsorbents were determined thermogravimetrically at different CO2 concentrations (6-100%) and adsorption temperatures (303-373 K) which have a much more relevance for the flue gas application. Highest adsorption capacity of 2.43 mmol g-1 for this sample was obtained at 303 K under pure CO2 flow. Complete regenerability of the adsorbent over four adsorption-desorption cycles was obtained. Fractional order kinetic model provided best description of adsorption over all adsorption temperatures and CO2 concentrations. Heterogeneity of the adsorbent surface was confirmed from the Langmuir and Freundlich isotherms fits and isosteric heat of adsorption values. Exothermic, spontaneous and feasible nature of adsorption process was confirmed from thermodynamic parameter values. The combination of high surface area and large pore volume makes the adsorbent a new promising carbon material for CO2 capture from power plant flue gas and for other relevant applications.
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Affiliation(s)
- Deepak Tiwari
- Department of Chemical Engineering, Thapar Institute of Engineering & Technology (Deemed to be University), Patiala 147004, Punjab, India.
| | - Haripada Bhunia
- Department of Chemical Engineering, Thapar Institute of Engineering & Technology (Deemed to be University), Patiala 147004, Punjab, India.
| | - Pramod K Bajpai
- Department of Chemical Engineering, Thapar Institute of Engineering & Technology (Deemed to be University), Patiala 147004, Punjab, India.
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CO 2 adsorption on oxygen enriched porous carbon monoliths: Kinetics, isotherm and thermodynamic studies. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.11.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Synthesis of nitrogen enriched porous carbons from urea formaldehyde resin and their carbon dioxide adsorption capacity. J CO2 UTIL 2017. [DOI: 10.1016/j.jcou.2017.08.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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