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Controlled polyethylene glycol and activated carbon interaction with nanoscale zerovalent iron for trichloroethylene degradation. J Taiwan Inst Chem Eng 2020. [DOI: 10.1016/j.jtice.2020.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Abstract
Among all minerals, iron is one of the elements identified early by human beings to take advantage of and be used. The role of iron in human life is so great that it made an era in the ages of humanity. Pure iron has a shiny grayish-silver color, but after combining with oxygen and water it can make a colorful set of materials with divergent properties. This diversity sometimes appears ambiguous but provides variety of applications. In fact, iron can come in different forms: zero-valent iron (pure iron), iron oxides, iron hydroxides, and iron oxide hydroxides. By taking these divergent materials into the nano realm, new properties are exhibited, providing us with even more applications. This review deals with iron as a magic element in the nano realm and provides comprehensive data about its structure, properties, synthesis techniques, and applications of various forms of iron-based nanostructures in the science, medicine, and technology sectors.
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Zhang Z, Yue X, Duan Y, Rao Z. A study on the mechanism of oxidized quinoline removal from acid solutions based on persulfate-iron systems. RSC Adv 2020; 10:12504-12510. [PMID: 35497624 PMCID: PMC9051261 DOI: 10.1039/c9ra10556e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 02/11/2020] [Indexed: 11/21/2022] Open
Abstract
Quinoline (Qu) and its derivatives have been widely regarded as hazardous pollutants in the world because of their acute toxicity to humans and animals, and potential carcinogenic risks. In this study, a novel sulfate radical system co-activated by ferrous and ZVI was developed to remove Qu from acidic solutions. The optimal ratio of ferrous and ZVI in the system and the mechanism of Qu removal from acidic solutions are also explored. The ZVI can initiate activation using hydrogen ions, which are released from the reaction of Fe2+, organics and PS in acidic solutions. This may dramatically improve the overall removal efficiency of Qu. The results indicated that the initial removal rate of Qu increases from 85.8% to 92.9%. The cleavage pathway of Qu is speculated by Frontier molecular orbital (FMO) theory and verified by GC/MS analysis.
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Affiliation(s)
- Zhichun Zhang
- College of Environment Science and Engineering, Taiyuan University of Technology Taiyuan 030024 China +86-351-3176581 +86-351-3176581
| | - Xiuping Yue
- College of Environment Science and Engineering, Taiyuan University of Technology Taiyuan 030024 China +86-351-3176581 +86-351-3176581
| | - Yanqing Duan
- College of Environment Science and Engineering, Taiyuan University of Technology Taiyuan 030024 China +86-351-3176581 +86-351-3176581
| | - Zhu Rao
- Environmental Organic Geochemistry, Key Laboratory of Eco-Geochemical, Ministry of Land and Resources, National Research Center for Geoanalysis Beijing China
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Baskaran D, Rajamanickam R, Pakshirajan K. Experimental studies and neural network modeling of the removal of trichloroethylene vapor in a biofilter. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 250:109385. [PMID: 31521920 DOI: 10.1016/j.jenvman.2019.109385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 08/05/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
In this study, bamboo carrier based lab scale compost biofilter was evaluated to treat synthetic waste air containing trichloroethylene (TCE) under continuous operation mode. The effect of inlet TCE concentration and gas flow rate and its removal was investigated. Maximum TCE removal efficiency was found to be 89% under optimum conditions of inlet 0.986 g/m3 TCE concentration corresponding to a loading rate of 43 g/m3 h and 0.042 m3/h gas flow rate at empty bed residence time (EBRT) of 2 min. For the first time, Artificial Neural Network (ANN) was applied to predict the performance of the compost biofilter in terms of TCE removal. The ANN model used a three layer feed forward based Levenberg-Marquardt algorithm, and its topology consisted of 3-25-1 as the optimum number for the three layers (input, hidden and output). An excellent match between the experimental and ANN predicted the value of TCE removal was obtained with a coefficient of determination (R2) value greater than 0.99 during the model training, validation, testing and overall. Furthermore, statistical analysis of the ANN model performance mediated its prediction accuracy of the bioreactor to treat TCE contaminated systems.
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Affiliation(s)
- Divya Baskaran
- Department of Chemical Engineering, Annamalai University, Cuddalore, 608002, Tamil Nadu, India
| | - Ravi Rajamanickam
- Department of Chemical Engineering, Annamalai University, Cuddalore, 608002, Tamil Nadu, India.
| | - Kannan Pakshirajan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
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Zhou H, Wu S, Zhou Y, Yang Y, Zhang J, Luo L, Duan X, Wang S, Wang L, Tsang DCW. Insights into the oxidation of organic contaminants by iron nanoparticles encapsulated within boron and nitrogen co-doped carbon nanoshell: Catalyzed Fenton-like reaction at natural pH. ENVIRONMENT INTERNATIONAL 2019; 128:77-88. [PMID: 31029982 DOI: 10.1016/j.envint.2019.04.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 03/17/2019] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
Iron nanoparticles encapsulated within boron and nitrogen co-doped carbon nanoshell (B/N-C@Fe) were synthesized through a novel and green pyrolysis process using melamine, boric acid, and ferric nitrate as the precursors. The surface morphology, structure, and composition of the B/N-C@Fe materials were thoroughly investigated. The materials were employed as novel catalysts for the activation of potassium monopersulfate triple salt (PMS) for the degradation of levofloxacin (LFX). Linear sweep voltammograms and quenching experiments were used to identify the mechanisms of PMS activation and LFX oxidation by B/N-C@Fe, where SO4- as well as HO were proved to be the main radicals for the reaction processes. This study also discussed how the fluvic acid and inorganic anions in the aqueous solutions affected the degradation of LFX and use this method to simulate the degradation in the real wastewater. The synthesized materials showed a high efficiency (85.5% of LFX was degraded), outstanding stability, and excellent reusability (77.7% of LFX was degraded in the 5th run) in the Fenton-like reaction of LFX. In view of these advantages, B/N-C@Fe have great potentials as novel strategic materials for environmental catalysis.
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Affiliation(s)
- Hao Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shikang Wu
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
| | - Yuan Yang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jiachao Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Xiaoguang Duan
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Shaobin Wang
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Lei Wang
- Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin St, Sheffield S1 3JD, United Kingdom; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
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Mahmoud ME, Saad EA, Soliman MA, Abdelwahab MS. Environmental water remediation using covalently functionalized zerovalent iron nanocomposites with 2-pyridinecarboxaldehyde via 3-aminopropyltrimethoxysilane and ethylenediamine. SEP SCI TECHNOL 2018. [DOI: 10.1080/01496395.2018.1529045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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