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Qin Y, Yuan R, Wang S, Zhang X, Luo S, He X. Catalytic Ozonation Treatment of Coal Chemical Reverse Osmosis Concentrate: Water Quality Analysis, Parameter Optimization, and Catalyst Deactivation Investigation. TOXICS 2024; 12:681. [PMID: 39330609 PMCID: PMC11435963 DOI: 10.3390/toxics12090681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2024] [Revised: 09/10/2024] [Accepted: 09/17/2024] [Indexed: 09/28/2024]
Abstract
Catalytic ozone oxidation, which is characterized by strong oxidizing properties and environmental friendliness, has been widely used in organic wastewater treatments. However, problems such as a low organic pollutant removal efficiency and unstable operation during the catalytic ozone treatment process for wastewater remain. To address these disadvantages, in this study, the treatment efficacy of catalytic ozone oxidation on a coal chemical reverse osmosis concentrate was investigated. The basic water quality indicators of the chemical reverse osmosis concentrate were analyzed. The effects of initial pollutant concentration, pH, ozone concentration, and catalyst concentration on the COD removal rate from the coal chemical reverse osmosis concentrate were explored. Water quality indicators of the chemical reverse osmosis concentrate before and after the catalytic ozone treatment were studied using spectroscopic analysis methods. The RO concentrate demonstrated large water quality fluctuations, and the catalytic ozonation process removed most of the pollutants from the treated wastewater. A possible deactivation mechanism of the ozone catalyst was also proposed. This study provides a theoretical reference and technical support for the long-term, efficient, and stable removal of organic pollutants from coal chemical reverse osmosis concentrate using a catalytic ozone oxidation process in practical engineering applications.
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Affiliation(s)
- Yihe Qin
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (Y.Q.); (R.Y.)
| | - Run Yuan
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China; (Y.Q.); (R.Y.)
| | - Shaozhou Wang
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China; (S.W.); (X.Z.); (S.L.)
| | - Xuewei Zhang
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China; (S.W.); (X.Z.); (S.L.)
| | - Shaojun Luo
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China; (S.W.); (X.Z.); (S.L.)
| | - Xuwen He
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China; (S.W.); (X.Z.); (S.L.)
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2
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Zhang H, Li S, Zhang C, Ren X, Zhou M. A critical review of ozone-based electrochemical advanced oxidation processes for water treatment: Fundamentals, stability evaluation, and application. CHEMOSPHERE 2024; 365:143330. [PMID: 39277044 DOI: 10.1016/j.chemosphere.2024.143330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 08/27/2024] [Accepted: 09/10/2024] [Indexed: 09/17/2024]
Abstract
In recent years, electrochemical advanced oxidation processes (EAOPs) combined with ozonation have been widely utilized in water/wastewater treatment due to their excellent synergistic effect, high treatment efficiency, and low energy consumption. A comprehensive summary of these ozone-based EAOPs is still insufficient, though some reviews have covered these topics but either focused on a specific integrated process or provided synopses of EAOPs or ozone-based AOPs. This review presents an overview of the fundamentals of several ozone-based EAOPs, focusing on process optimization, electrode selection, and typical reactor designs. Additionally, the service life of electrodes and improvement strategies for the stability of ozone-based EAOPs that are ignored by previous reviews are discussed. Furthermore, four main application fields are summarized, including disinfection, emerging contaminants treatment, industrial wastewater treatment, and resource recovery. Finally, the summary and perspective on ozone-based EAOPs are proposed. This review provides an overall summary that would help to gain insight into the ozone-based EAOPs to improve their environmental applications.
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Affiliation(s)
- Hanyue Zhang
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Shasha Li
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Chaohui Zhang
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Xueying Ren
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Minghua Zhou
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
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Xiang X, Mao X, Ding X, Gu X, Li H, Liu R, Liu Y, Jin J, Qin L. Assembly of core-shell Fe 3O 4 @CD-MOFs derived hollow magnetic microcubes for efficient extraction of hazardous substances: Plausible mechanisms for selective adsorption. JOURNAL OF HAZARDOUS MATERIALS 2024; 473:134588. [PMID: 38797072 DOI: 10.1016/j.jhazmat.2024.134588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 05/08/2024] [Accepted: 05/09/2024] [Indexed: 05/29/2024]
Abstract
Hazardous heavy metals and organic substances removal is of great significance for ensuring the safety of aquatic-ecosystem, yet the highly effective and selective extraction always remains challenging. To address this problem, magnetic hollow microcubes were fabricated through thermal carbonization of Fe3O4-COOH@ γ-CD-MOFs, and core-shell structured precursors were in-situ greenly constructed on a large scale via microwave-assisted self-assembly strategy. As noted, the development of secondary crystallization was utilized to achieve uniform dispersion of cores within MOFs frameworks and thus improved magnetic and adsorption ability of composites. Acquired magnetic Fe3O4 @HC not only can harvest excellent extraction of heavy metals (Cd, Pb, and Cu of 129.87, 151.05, and 106.98 mg·g-1) but also exhibit highly selective adsorption ability for cationic organics (separation efficiency higher than 95.0 %). Impressively, Fe3O4 @HC achieved outstanding adsorption (60-80 %) of Cd in realistic mussel cooking broth with no obvious loss in amino acid. Characterizations better offer mechanistic insight into the enhanced selectivity of positively charged pollutants can be attributed to synergistic effect of ions exchange and electrostatic interaction of abundant oxygen-containing functional groups. Our study provides a feasible route by rationally developing core-shell structured composites to promote the practical applications of sustainable water treatment and value-added utilization of processing by-products.
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Affiliation(s)
- Xingwei Xiang
- College of Food Science and Technology, Key Laboratory of Marine Fishery Resources Exploitment & Utilization, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiaoyan Mao
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, State Key Lab Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xinqi Ding
- College of Food Science and Technology, Key Laboratory of Marine Fishery Resources Exploitment & Utilization, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiu Gu
- Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Haorui Li
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, State Key Lab Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Ruizhi Liu
- Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Yong Liu
- National Narcotic Laboratory Zhejiang Regional Center (NNLZRC), Hangzhou 310053, China
| | - Jiabin Jin
- National Narcotic Laboratory Zhejiang Regional Center (NNLZRC), Hangzhou 310053, China
| | - Lei Qin
- Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, State Key Lab Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China.
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Mortazavi M, Garg S, Waite TD. Kinetic modelling assisted balancing of organic pollutant removal and bromate formation during peroxone treatment of bromide-containing waters. JOURNAL OF HAZARDOUS MATERIALS 2024; 468:133736. [PMID: 38377900 DOI: 10.1016/j.jhazmat.2024.133736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/25/2024] [Accepted: 02/04/2024] [Indexed: 02/22/2024]
Abstract
The peroxone process (O3/H2O2) is reported to be a more effective process than the ozonation process due to an increased rate of generation of hydroxyl radicals (•OH) and inhibition of bromate (BrO3-) formation which is otherwise formed on ozonation of bromide containing waters. However, the trade-off between the H2O2 dosage required for minimization of BrO3- formation and effective pollutant removal has not been clearly delineated. In this study, employing experimental investigations as well as chemical modelling, we show that the concentration of H2O2 required to achieve maximum pollutant removal may not be the same as that required for minimization of BrO3- formation. At the H2O2 dosage required to minimize BrO3- formation (<10 µg/L), only pollutants with high to moderate reactivity towards O3 and •OH are effectively removed. For pollutants with low reactivity towards O3/•OH, high O3 (O3:DOC>>1 g/g) and high H2O2 dosages (O3:H2O2 ∼1 (g/g)) are required for minimizing BrO3- formation along with effective pollutant removal which may result in a very high residual of H2O2 in the effluent, causing secondary pollution. On balance, we conclude that the peroxone process is not effective for the removal of low reactivity micropollutants if minimization of BrO3- formation is also required.
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Affiliation(s)
- Mahshid Mortazavi
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Shikha Garg
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - T David Waite
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
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Yin X, Zhang J, Chen S, Li W, Zhu H, Wei K, Zhang Y, Chen H, Han W. Electric field-enhanced heterogeneous catalytic ozonation (EHCO) process for sulfadiazine removal: The role of cathodic reduction. CHEMOSPHERE 2024; 351:141226. [PMID: 38228193 DOI: 10.1016/j.chemosphere.2024.141226] [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: 10/11/2023] [Revised: 01/04/2024] [Accepted: 01/13/2024] [Indexed: 01/18/2024]
Abstract
In this work, an electric field-enhanced heterogeneous catalytic ozonation (EHCO) was systematically investigated using a prepared FeOx/PAC catalyst. The EHCO process exhibited high sulfadiazine (SDZ) and TOC removal efficiency compared with electrocatalysis (EC) and heterogeneous catalytic ozonation (HCO) process. Almost 100% of SDZ was removed within 2 min, and the TOC removal reached approximately 85% within 60 min. Quenching experiments and EPR analysis suggested that the prominent SDZ and TOC removal performance is supported by the enhanced ·OH generation ability. Further study proved that H2O2 formed by O2 electrochemical reduction, peroxone reaction and electrochemical reduction of ozone contributed to improving ·OH generation. Furthermore, the EHCO system showed satisfactory stability and recyclability compared to conventional HCO systems, and the SDZ and TOC removal rates were maintained at ≥95% and ≥70% in 16 consecutive recycles, respectively. Meanwhile, XPS analysis and Boehm's titration for the FeOx/PAC catalyst used in HCO and EHCO process confirmed that the external electron supply could restrain the oxidation of surface functional groups of PAC and maintain a balance of the Fe(II)/Fe(III) ratio, which proved the critical role of cathode reduction in catalyst in situ regeneration during long consecutive recycles. In addition, the EHCO system could achieve more than 80% SDZ removal within 2 min in different water matrices. These results confirmed that the EHCO process has a wide application perspective for refractory organics removal in actual wastewater.
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Affiliation(s)
- Xu Yin
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Jie Zhang
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Siru Chen
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Wei Li
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Hongwei Zhu
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Kajia Wei
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China.
| | - Yonghao Zhang
- School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Haoming Chen
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Weiqing Han
- Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China.
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Chen Y, He J, Pang H, Yu D, Jiang P, Hao X, Zhang J. Electrochemical denitrification by a recyclable cobalt oxide cathode: Rapid recovery and selective catalysis. JOURNAL OF HAZARDOUS MATERIALS 2024; 463:132870. [PMID: 37924706 DOI: 10.1016/j.jhazmat.2023.132870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 10/16/2023] [Accepted: 10/24/2023] [Indexed: 11/06/2023]
Abstract
Cathodic aging and fouling have presented significant challenges in the realm of electrochemical denitrification for engineering applications. This study focused on the development of an economical and recyclable nanoporous Co3O4/Co cathode through anodization for nitrate reduction. What distinguished our cathode was its exceptional sustainability. Cobalt from the inactive catalyst could be reclaimed onto the substrate, enabling the regeneration of a new Co3O4 layer. This innovative approach resulted in an exceptionally low Co catalyst consumption, a mere 1.936 g/1 kg N, making it the most cost-effective choice among all Co-based cathodes. The Co3O4 catalyst exhibited a truncated octahedron structure, primarily composed of surface Co2+ ions. Density functional theory calculations confirmed that the bonding between the O atom in NO3- ions and the Co atom in Co3O4 was thermodynamically favorable, with a free energy of - 0.89 eV. Co2+ ions acted as "electron porters" facilitating electron transfer through a redox circle Co2+-Co3+-Co2+. However, the presence of two energy barriers (*NH2NO to *N2 and *N2 to N2) with respective heights of 0.83 eV and 1.17 eV resulted in a N2 selectivity of 9.84% and an NH3 selectivity of 90.02%. In actual wastewater treatment, approximately 78% of TN and 93% of NO3- were successfully removed after 3 h, consistent with the prediction kinetic model. This anodization-based strategy offers a significant advantage in terms of long-term cost and presents a new paradigm for electrode sustainability.
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Affiliation(s)
- Yiwen Chen
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China
| | - Heliang Pang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Dehai Yu
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Peigeng Jiang
- North China Municipal Engineering Design & Research Institute Co., Ltd, Tianjin 300202, China Guangzhou University, Guangzhou 510006, PR China
| | - Xiujuan Hao
- School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
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Kong X, Garg S, Mortazavi M, Ma J, Waite TD. Heterogenous Iron Oxide Assemblages for Use in Catalytic Ozonation: Reactivity, Kinetics, and Reaction Mechanism. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:18636-18646. [PMID: 36648439 DOI: 10.1021/acs.est.2c07319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Heterogeneous catalytic ozonation (HCO) has gained increasing attention as an effective process to remove refractory organic pollutants from industrial effluents. However, widespread application of HCO is still limited due to the typically low efficacy of catalysts used and matrix passivation effects. To this end, we prepared an Al2O3-supported Fe catalyst with high reactivity via a facile urea-based heterogeneous precipitation method. Due to the nonsintering nature of the preparation method, a heterogeneous catalytic layer comprised of γ-FeOOH and α-Fe2O3 is formed on the Al2O3 support (termed NS-Fe-Al2O3). On treatment of a real industrial effluent by HCO, the presence of NS-Fe-Al2O3 increased the removal of organics by ∼100% compared to that achieved with a control catalyst (i.e., α-Fe2O3/Al2O3 or γ-FeOOH/Al2O3) that was prepared by a conventional impregnation and calcination method. Furthermore, our results confirmed that the novel NS-Fe-Al2O3 catalyst demonstrated resistance to the inhibitory effect of high concentration of chloride and sulfate ions usually present in industrial effluent. A mathematical kinetic model was developed that adequately describes the mechanism of HCO process in the presence of NS-Fe-Al2O3. Overall, the results presented here provide valuable guidance for the synthesis of effective and robust catalysts that will facilitate the wider industrial application of HCO.
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Affiliation(s)
- Xiangtong Kong
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW2052, Australia
| | - Shikha Garg
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW2052, Australia
| | - Mahshid Mortazavi
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW2052, Australia
| | - Jinxing Ma
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou510006, P.R. China
| | - T David Waite
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW2052, Australia
- UNSW Centre for Transformational Environmental Technologies (CTET), Yixing, Jiangsu Province214206, P.R. China
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Lu K, Ren T, Yan N, Huang X, Zhang X. Revisit the Role of Salinity in Heterogeneous Catalytic Ozonation: The Trade-Off between Reaction Inhibition and Mass Transfer Enhancement. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:18888-18897. [PMID: 37387610 DOI: 10.1021/acs.est.3c00595] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
Heterogeneous catalytic ozonation (HCO) is an effective technology for advanced wastewater treatment, while the influence of coexisting salts remains unclear and controversial. Here, we systematically explored the influence of NaCl salinity on the reaction and mass transfer of HCO through lab experiments, kinetic simulation, and computational fluid dynamics modeling, and proposed that the trade-off between reaction inhibition and mass transfer enhancement would affect the pollutants degradation pattern under varying salinity. The increase of NaCl salinity decreased ozone solubility and accelerated the futile consumption of ozone and hydroxyl radicals (•OH), and the maximum •OH concentration under 50 g/L salinity was only 23% of that without salinity. However, the increase of NaCl salinity also significantly reduced the ozone bubble size and enhanced the interphase and intraliquid mass transfer, with the volumetric mass transfer coefficient being 130% higher than that without salinity. The trade-off between reaction inhibition and mass transfer enhancement shifted under different pH values and aerator pore sizes, and the oxalate degradation pattern would change correspondingly. Besides, the trade-off was also identified for Na2SO4 salinity. These results emphasized the dual influence of salinity and offered a new theoretical perspective on the role of salinity in the HCO process.
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Affiliation(s)
- Kechao Lu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Tengfei Ren
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Ni Yan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xiaoyuan Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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An Z, Yang D, Li M, Huo Y, Jiang J, Zhou Y, Ma Y, Hou W, Zhang J, He M. Hydroxylation of some emerging disinfection byproducts (DBPs) in water environment: Halogenation induced strong pH-dependency. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131233. [PMID: 36948122 DOI: 10.1016/j.jhazmat.2023.131233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/24/2023] [Accepted: 03/15/2023] [Indexed: 06/18/2023]
Abstract
In this work, the hydroxylation mechanisms and kinetics of some emerging disinfection byproducts (DBPs) have been systematically investigated through theoretical calculation methods. Five chlorophenols and eleven halogenated pyridinols were chosen as the model compounds to study their pH-dependent reaction laws in UV/H2O2 system. For the reactions of HO• with 37 different dissociation forms, radical adduct formation (RAF) was the main reaction pathway, and the reactivity decreased with the increase of halogenation degree. The kapp values (at 298 K) increased with the increase of pH from 0 to 10, and decreased with the increase of pH from 10 to 14. Compared with phenol, the larger the chlorination degree in chlorophenols was, the stronger the pH sensitivity of the kapp values; compared with chlorophenols, the pH sensitivity in halogenated pyridinols was further enhanced. As the pH increased from 2 to 10.5, the degradation efficiency increased at first and then decreased. With the increase of halogenation degree, the degradation efficiency range increased, the pH sensitivity increased, the optimal degradation efficiency slightly increased, and the optimal degradation pH value decreased. The ecotoxicity and bioaccumulation of most hydroxylated products were lower than their parental compounds. These findings provided meaningful insights into the strong pH-dependent hydroxylation of emerging DBPs on molecular level.
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Affiliation(s)
- Zexiu An
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China; Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Dongchen Yang
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Mingxue Li
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Yanru Huo
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Jinchan Jiang
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Yuxin Zhou
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Yuhui Ma
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Wenlong Hou
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Jinlin Zhang
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China.
| | - Maoxia He
- Environment Research Institute, Shandong University, Qingdao 266237, China.
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Kong X, Garg S, Chen G, Waite TD. Investigation of the deactivation and regeneration of an Fe 2O 3/Al 2O 3•SiO 2 catalyst used in catalytic ozonation of coal chemical industry wastewater. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131194. [PMID: 36921420 DOI: 10.1016/j.jhazmat.2023.131194] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 02/23/2023] [Accepted: 03/10/2023] [Indexed: 06/18/2023]
Abstract
Catalyst deactivation is an ongoing concern for industrial application of catalytic ozonation processes. In this study, we systematically investigated the performance of a catalytic ozonation process employing Fe2O3/Al2O3•SiO2 catalyst for the treatment of coal chemical industry (CCI) wastewater using pilot-scale and laboratory-scale systems. Our results show that the activity of the Fe2O3/Al2O3•SiO2 catalyst for organic contaminant removal deteriorated over time due to formation of a dense and thin carbonaceous layer on the Fe2O3 catalyst surface. EPR and fluorescence imaging analysis confirm that the passivation layer essentially inhibited the O3-catalyst interaction thereby minimizing formation of surficial •OH and associated oxidation of organic contaminants on the catalyst surface. Calcination was demonstrated to be effective in restoring the activity of the catalyst since the carbonaceous layer could be efficiently combusted during calcination to re-establish the surficial •OH-mediated oxidation process. The combustion of the carbonaceous layer and restoration of the Fe layer on the surface on calcination was confirmed based on SEM-EDX, FTIR and thermogravimetric analysis. Cost analysis indicates that regeneration using calcination is economically viable compared to catalyst replacement. The results of this study are expected to pave the way for developing appropriate regeneration techniques for deactivated catalysts and optimising the catalyst synthesis procedure.
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Affiliation(s)
- Xiangtong Kong
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Shikha Garg
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Guifeng Chen
- China Coal Research Institute, Beijing 100013, PR China
| | - T David Waite
- Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia; UNSW Centre for Transformational Environmental Technologies (CTET), Yixing, Jiangsu 214206, PR China.
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Azaiza AA, Semiat R, Shemer H. Competitive study of homogeneous and heterogeneous Fenton-like flow-through propoxur oxidation in ROC solution. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:2890-2904. [PMID: 37318930 PMCID: wst_2023_160 DOI: 10.2166/wst.2023.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Reverse osmosis is used as a tertiary treatment for wastewater reclamation. However, sustainable management of the concentrate (ROC) is challenging, due to the need for treatment and/or disposal. The objective of this research was to investigate the efficiency of homogeneous and heterogeneous Fenton-like oxidation processes in removing propoxur (PR), a micro-pollutant compound, from synthetic ROC solution in a submerged ceramic membrane reactor operated in a continuous mode. A freshly prepared amorphous heterogeneous catalyst was synthesized and characterized, revealing a layered porous structure of 5-16 nm nanoparticles that formed aggregates (33-49 μm) known as ferrihydrite (Fh). The membrane exhibited a rejection of >99.6% for Fh. The homogeneous catalysis (Fe3+) exhibited better catalytic activity than the Fh in terms of PR removal efficiencies. However, by increasing the H2O2 and Fh concentrations at a constant molar ratio, the PR oxidation efficiencies were equal to those catalyzed by the Fe3+. The ionic composition of the ROC solution had an inhibitory effect on the PR oxidation, whereas increased residence time improved it up to 87% at a residence time of 88 min. Overall, the study highlights the potential of heterogeneous Fenton-like processes catalyzed by Fh in a continuous mode of operation.
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Affiliation(s)
- Abed-Alhakeem Azaiza
- Rabin Desalination Laboratory, Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel E-mail:
| | - Raphael Semiat
- Rabin Desalination Laboratory, Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel E-mail:
| | - Hilla Shemer
- Rabin Desalination Laboratory, Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel E-mail:
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Yang SQ, Liu ZQ, Cui YH, Wang MK. Organics abatement and recovery from wastewater by a polymerization-based electrochemically assisted persulfate process: Promotion effect of chloride ion and its mechanism. JOURNAL OF HAZARDOUS MATERIALS 2023; 446:130658. [PMID: 36580777 DOI: 10.1016/j.jhazmat.2022.130658] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/17/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Ubiquitous chloride ion (Cl-) in wastewaters usually inhibits the degradation of organic contaminants and generates numerous toxic chlorinated products in conventional degradation-based advanced oxidation processes (AOPs). Herein, a more Cl- tolerant polymerization-based electrochemical AOP for organic contaminants abatement and simultaneous organic resource recovery was demonstrated with eight typical organic contaminants and two real industrial wastewaters for the first time. This process can significantly promote dissolved organic carbon (DOC) abatement in the presence of Cl-, differing greatly from conventional degradation-based processes. Compared to sulfate radical (SO4•-) (or hydroxyl radical (HO•)), dichloride radical (Cl2•-) derived from Cl- has moderate reactivity towards most contaminants, which facilitates the organics polymerization as it ensures the formation of polymerizable organic radicals while inhibiting their excessive degradation. Thus, high DOC abatement (over 75 %) and high organic resource recovery ratio (48-79 % separable organic-polymer yield) can be achieved for most contaminants. Both soluble chlorinated compounds and solid chlorinated polymers are formed in the presence of Cl-. The chlorinated products (e.g. chlorophenols) can be polymerized as new monomers, thus the concentration of dissolved organic chlorinated products is much lower than that in conventional degradation-based process. The tolerance of the present process to Cl- is tested in real coking wastewaters, and exceeding 60 % of the abated chemical oxygen demand (COD) is obtained in the form of recoverable organic-polymers.
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Affiliation(s)
- Sui-Qin Yang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, PR China; School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Hongshan District, Wuhan 430074, PR China
| | - Zheng-Qian Liu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Hongshan District, Wuhan 430074, PR China
| | - Yu-Hong Cui
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Hongshan District, Wuhan 430074, PR China.
| | - Ming-Kui Wang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, PR China
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He C, Zhang Z, Han J, Gong C, Zhang J, Wang L, He P, Shan Y, Zhang X. Advanced treatment of high-salinity wastewater by catalytic ozonation with pilot- and full-scale systems and the effects of Cu 2+ in original wastewater on catalyst activity. CHEMOSPHERE 2023; 311:136971. [PMID: 36309063 DOI: 10.1016/j.chemosphere.2022.136971] [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: 08/21/2022] [Revised: 10/01/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
In this work, heterogeneous catalytic ozonation for the treatment of bio-treated saccharin sodium production wastewater (BSSW) was comprehensively investigated with pilot- and full-scale systems, with special emphasis on the effects of Cu2+ in the original wastewater on catalyst activity. The results of semi-batch and continuous experiments show that heterogeneous catalytic ozonation was effective in removing organic compounds from high-salinity wastewater and that Cu2+ in the original wastewater had a substantial effect on the performance of the process. The retention of 0.15 mM Cu2+ in BSSW increased the chemical oxygen demand (COD) removal by 31% in semi-batch reactor with heterogeneous catalytic ozonation. The stable COD removal efficiencies ranged from 74% to 66.4% for a 9-month operation, indicating that Cu2+ with an appropriate concentration in the original BSSW not only improved the COD removal efficiencies but also inhibited catalyst deactivation; catalyst deactivation was mainly caused by the deposition of inorganic salts on the catalyst surface. Cu2+ combined with some anions to inhibit the formation and deposition of inorganic salts that could easily cause deactivation. The deposited copper salts were readily eliminated, especially during backflushing operations. Moreover, in a full-scale study, heterogeneous catalytic ozonation with 0.15 mM Cu2+ in BSSW exhibited stable COD removal efficiencies (51%-83%) after over 3 years of operation. This study offers a new idea for using the inherent properties of wastewater to perform advanced treatments on high-salinity industrial wastewater through heterogeneous catalytic ozonation.
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Affiliation(s)
- Can He
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China.
| | - Zhongguo Zhang
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China.
| | - Junxing Han
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China
| | - Chenhao Gong
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China
| | - Jian Zhang
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China
| | - Liangliang Wang
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China
| | - Peiran He
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China
| | - Yue Shan
- Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing, 100089, PR China; Key Laboratory of Energy-Water Conservation and Wastewater Resources Recovery, China National Light Industry, Beijing, 100089, PR China; The National Engineering Laboratory of Circular Economy (Industrial Wastewater Utilization and Industrial Water Conservation), Beijing, 100089, China
| | - Xian Zhang
- Inner Mongolia University of Technology, Hohhot, 010051, PR China
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Chen X, Gu H, Sun X, Tian J, Li Q, Pan T, Zhang X, Hu X, Linghu S. Improvement of coal gasification reverse osmosis concentrate treatment by Cu-Co-Mn/AC catalytic ozonation. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:144-156. [PMID: 36640029 DOI: 10.2166/wst.2022.420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Approximately 20% of concentrate will be produced from coal gasification wastewater after reverse osmosis treatment. The organic matter contained in the concentrate affects its evaporation crystallisation; therefore, the refractory organics must be removed. In this study, Cu-Co-Mn/AC catalytic ozonation was used to treat reverse osmosis concentrate (ROC). With the addition of the Cu-Co-Mn/AC catalyst, the production of ·OH increased by 82 μmol/L, thereby enhancing the ozonation performance. The pH, ozone dosage, and catalyst dosage all affected the catalytic ozonation performance. By constructing a response surface model, it was found that the catalyst dosage had the most significant effect on the catalytic ozonation performance. The predicted optimal reaction conditions were pH = 9.02, ozone dosage = 1.08 g/L, and catalyst dosage = 1.33 g/L, under which the chemical oxygen demand (COD) removal reached a maximum of 81.49%.
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Affiliation(s)
- Xiurong Chen
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail: ; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Hao Gu
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
| | - Xiaoli Sun
- Shanghai Municipal Engineering Design Institute (Group) Co., LTD, Shanghai 200082, China
| | - Jinyi Tian
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
| | - Qiuyue Li
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
| | - Tao Pan
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
| | - Xinyu Zhang
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
| | - Xueyang Hu
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
| | - Shanshan Linghu
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, China E-mail:
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Babar M, Munir HMS, Nawaz A, Ramzan N, Azhar U, Sagir M, Tahir MS, Ikhlaq A, Mohammad Azmin SNH, Mubashir M, Khoo KS, Chew KW. Comparative study of ozonation and ozonation catalyzed by Fe-loaded biochar as catalyst to remove methylene blue from aqueous solution. CHEMOSPHERE 2022; 307:135738. [PMID: 35850223 DOI: 10.1016/j.chemosphere.2022.135738] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 06/30/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Ozone-based processes gained much attention in recent years. However, due to low oxidative stability and utilization rate, single ozonation process (SOP) is insufficient for complete mineralization of pollutants. As a result, the single ozonation process is performed in the presence of a catalyst, a process known as catalytic ozonation process (COP). A promising catalyst (Fe/BC) was prepared by impregnating iron on biochar surface to remove methylene blue from aqueous solution via heterogeneous catalytic ozonation process (HCOP). The prepared Fe/BC features were characterized using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller method (BET) before and after HCOP. Furthermore, the effect of various operating parameters such as ozone dose, catalyst dose, initial dye concentration, initial pH on the efficiency of SOP and HCOP were compared. In comparison to single ozonation process, the experimental study found that heterogeneous catalytic ozonation process has the highest efficiency. At pH 7.0, approximately 76% of methylene blue is removed during single ozonation process in 60 min. Heterogeneous catalytic ozonation process showed 95% methylene blue elimination from aqueous solution. The efficiency of heterogeneous catalytic ozonation process was decreased by 52% in the presence of hydroxyl radical (●OH) scavenger, indicating that hydroxyl is the major oxidant during heterogeneous catalytic ozonation process for the removal of methylene blue from aqueous solution. Fe/BC catalyst appears to have a lot of industrial promise, as well as the ability to remove methylene blue from aqueous solution via heterogeneous catalytic ozonation process.
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Affiliation(s)
- Muhammad Babar
- Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology (KFUEIT), Abu Dhabi Rd, Rahim Yar Khan, 64200, Pakistan
| | - Hafiz Muhammad Shahzad Munir
- Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology (KFUEIT), Abu Dhabi Rd, Rahim Yar Khan, 64200, Pakistan; Chemical Engineering Department, University of Engineering and Technology, Lahore, 54890, Pakistan.
| | - Aamna Nawaz
- Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology (KFUEIT), Abu Dhabi Rd, Rahim Yar Khan, 64200, Pakistan
| | - Naveed Ramzan
- Chemical Engineering Department, University of Engineering and Technology, Lahore, 54890, Pakistan
| | - Umair Azhar
- Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology (KFUEIT), Abu Dhabi Rd, Rahim Yar Khan, 64200, Pakistan.
| | - Muhammad Sagir
- Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology (KFUEIT), Abu Dhabi Rd, Rahim Yar Khan, 64200, Pakistan
| | - Muhammad Suleman Tahir
- Department of Chemical Engineering, Khwaja Fareed University of Engineering and Information Technology (KFUEIT), Abu Dhabi Rd, Rahim Yar Khan, 64200, Pakistan
| | - Amir Ikhlaq
- Institute of Environmental Engineering and Research, University of Engineering and Technology, Lahore, 54890, Pakistan
| | | | - Muhammad Mubashir
- Department of Petroleum Engineering, School of Engineering, Asia Pacific University of Technology and Innovation, 57000, Kuala Lumpur, Malaysia
| | - Kuan Shiong Khoo
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, Taiwan
| | - Kit Wayne Chew
- Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou, 325035, China; School of Energy and Chemical Engineering, Xiamen University Malaysia, Jalan Sunsuria, Bandar Sunsuria, 43900, Sepang, Selangor, Malaysia.
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Recent Developments in Activated Carbon Catalysts Based on Pore Size Regulation in the Application of Catalytic Ozonation. Catalysts 2022. [DOI: 10.3390/catal12101085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Due to its highly developed pore structure and large specific surface area, activated carbon is often used as a catalyst or catalyst carrier in catalytic ozonation. Although the pore structure of activated carbon plays a significant role in the treatment of wastewater and the mass transfer of ozone molecules, the effect is complicated and unclear. Because different application scenarios require catalysts with different pore structures, catalysts with appropriate pore structure characteristics should be developed. In this review, we systematically summarized the current adjustment methods for the pore structure of activated carbon, including raw material, carbonization, activation, modification, and loading. Then, based on the brief introduction of the application of activated carbon in catalytic ozonation, the effects of pore structure on catalytic ozonation and mass transfer are reviewed. Furthermore, we proposed that the effect of pore structure is mainly to provide catalytic active sites, promote free radical generation, and reduce mass transfer resistance. Therefore, large external surface area and reasonable pore size distribution are conducive to catalytic ozonation and mass transfer.
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Avramescu SM, Fierascu I, Fierascu RC, Brazdis RI, Nica AV, Butean C, Olaru EA, Ulinici S, Verziu MN, Dumitru A. Removal of Paracetamol from Aqueous Solutions by Photocatalytic Ozonation over TiO 2-Me xO y Thin Films. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:613. [PMID: 35214942 PMCID: PMC8875729 DOI: 10.3390/nano12040613] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/01/2022] [Accepted: 02/06/2022] [Indexed: 12/10/2022]
Abstract
Analgesics and nonsteroidal anti-inflammatory drugs (NSAIDs) such as paracetamol, diclofenac, and ibuprofen are frequently encountered in surface and ground water, thereby posing a significant risk to aquatic ecosystems. Our study reports the catalytic performances of nanosystems TiO2-MexOy (Me = Ce, Sn) prepared by the sol-gel method and deposited onto glass slides by a dip-coating approach in the removal of paracetamol from aqueous solutions by catalytic ozonation. The effect of catalyst type and operation parameters on oxidation efficiency was assessed. In addition to improving this process, the present work simplifies it by avoiding the difficult step of catalyst separation. It was found that the thin films were capable of removing all pollutants from target compounds to the oxidation products.
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Affiliation(s)
- Sorin Marius Avramescu
- Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 050663 Bucharest, Romania;
- PROTMED Research Centre, University of Bucharest, 050107 Bucharest, Romania; (A.V.N.); (E.A.O.)
| | - Irina Fierascu
- Emerging Nanotechnologies Group, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 060021 Bucharest, Romania;
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 011464 Bucharest, Romania
| | - Radu Claudiu Fierascu
- Emerging Nanotechnologies Group, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 060021 Bucharest, Romania;
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
| | - Roxana Ioana Brazdis
- Emerging Nanotechnologies Group, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, 060021 Bucharest, Romania;
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
| | - Angel Vasile Nica
- PROTMED Research Centre, University of Bucharest, 050107 Bucharest, Romania; (A.V.N.); (E.A.O.)
| | - Claudia Butean
- Department of Chemistry and Biology, North University Centre of Baia Mare, Technical University of Cluj-Napoca, 430122 Baia Mare, Romania;
| | - Elena Alina Olaru
- PROTMED Research Centre, University of Bucharest, 050107 Bucharest, Romania; (A.V.N.); (E.A.O.)
| | | | - Marian Nicolae Verziu
- Department of Bioresources and Polymer Science, Advanced Polymer Materials Group, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Gh Polizu Street, 011061 Bucharest, Romania;
| | - Anca Dumitru
- Faculty of Physics, University of Bucharest, 077125 Magurele, Romania
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