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Tsai CY, Liu CW, Hsi HC, Lin KS, Lin YW, Lai LC, Weng TN. Preparation of AgCl/TNTs nanocomposites for organic dyes and inorganic heavy metal removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:22082-22096. [PMID: 31147996 DOI: 10.1007/s11356-019-05570-8] [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: 01/18/2019] [Accepted: 05/24/2019] [Indexed: 06/09/2023]
Abstract
In this study, TiO2 nanotubes (TNTs) and AgCl-modified TNTs nanocomposites with multiple crystal phases were synthesized through a hydrothermal method without calcination. The resultant samples had a large Brunauer-Emmett-Teller surface area. Additionally, the Ag modification process reduced the recombination rate of electron-hole pairs in the synthesized sample and possessed more oxygen vacancy sites. The surface area of the AgCl-modified TNTs was smaller than that of non-modified TNTs sample; however, the nanocomposites exhibited outstanding photocatalytic performance and adsorption properties. AgCl compounds present on the TNTs surface effectively interacted with Hg0, improving the dye photodegradation efficiency. The Hg0 removal efficiencies of the TNTs and AgCl-modified TNTs samples were about 63% and 86%, respectively. The crystal violet (CV) and malachite green (MG) removal efficiencies of the AgCl-modified TNTs sample were around 57% and 72%, respectively. Both dyes photodecomposition efficiencies for AgCl-modified TNTs sample are higher than those of TNTs sample. The oxygen vacancy on the AgCl-modified TNTs surface was determined to be advantageous for OH- and arsenate adsorption through ligand exchange. The maximum adsorption quantity of As5+ calculated by Langmuir equation was 15.38 mg g-1 (TNTs) and 21.10 mg g-1 (AgCl-modified TNTs).
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Affiliation(s)
- Cheng-Yen Tsai
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan
| | - Chen-Wuing Liu
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan.
| | - Hsing-Cheng Hsi
- Graduate Institute of Environmental Engineering, National Taiwan University, No. 71, Chou-Shan Road, Taipei, 106, Taiwan
| | - Kuen-Song Lin
- Department of Chemical Engineering and Materials Science, Yuan Ze University, No. 135, Yuan-Tung Road, Chung-Li, Taoyuan City, 320, Taiwan
| | - Yi-Wen Lin
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan
| | - Li-Chi Lai
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan
| | - Tsung-Nan Weng
- Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan
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ZHANG LX, ZHANG AC, ZHU QF, WANG H, ZHANG CJ. Effects of experimental parameters on Hg 0 removal over magnetic AgI-BiOI/CoFe 2 O 4 photocatalysts using wet process. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/s1872-5813(18)30016-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhao Y, Hao R, Xue F, Feng Y. Simultaneous removal of multi-pollutants from flue gas by a vaporized composite absorbent. JOURNAL OF HAZARDOUS MATERIALS 2017; 321:500-508. [PMID: 27669391 DOI: 10.1016/j.jhazmat.2016.09.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 09/18/2016] [Accepted: 09/20/2016] [Indexed: 06/06/2023]
Abstract
An economical process that was used to remove SO2, NO and Hg0 simultaneously was developed, based on the pre-oxidations of Hg0 and NO by a vaporized Fenton-based complex oxidant (FO) consisted of Fenton and NaClO. The effects of concentrations of FeSO4 and NaClO in the oxidant, the molar ratio of vaporized oxidant to multi-pollutant, the oxidant solution pH, the reaction temperature, the gas flow ratio of vaporized FO to multi-pollutants, the flue gas flow and the concentrations of coexistence gases in flue gas on the simultaneous removals were investigated experimentally. The results showed that the removals of NO and Hg0 were significantly depended on FeSO4 and NaClO concentrations, the molar ratio of vaporized oxidant to multi-pollutants, the FO solution pH, the reaction temperature, the gas flow ratio of vaporized FO to multi-pollutants and flue gas flow. And higher concentration of SO2 and an appropriate concentration of NO had the promotion for Hg0 removal. The average simultaneous removal efficiencies of 100% for SO2, 81% for NO and 91% for Hg0 were obtained under the optimal reaction conditions. According to the characterization of the reaction removal products by SEM, EDS, XRD and AFS, the reaction mechanism was speculated.
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Affiliation(s)
- Yi Zhao
- School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China.
| | - Runlong Hao
- School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Fangming Xue
- School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Yanan Feng
- School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
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Liu Y, Adewuyi YG. A review on removal of elemental mercury from flue gas using advanced oxidation process: Chemistry and process. Chem Eng Res Des 2016. [DOI: 10.1016/j.cherd.2016.06.024] [Citation(s) in RCA: 125] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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