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Enhanced activation of periodate by iodine-doped granular activated carbon for organic contaminant degradation.
Chemosphere. 2017 Aug; 181:609-618.C

Abstract

In this study, iodine-doped granular activated carbon (I-GAC) was prepared and subsequently applied to activate periodate (IO4-) to degrade organic contaminants at ambient temperature. The physicochemical properties of GAC and I-GAC were examined using scanning electron microscopy, N2 adsorption/desorption, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. No significant difference was observed between the two except for the existence of triiodide (I3-) and pentaiodide (I5-) on I-GAC. The catalytic activity of I-GAC towards IO4- was evaluated by the degradation of acid orange 7 (AO7), and superior catalytic performance was achieved compared with GAC. The effects of some influential parameters (preparation conditions, initial solution pH, and coexisting anions) on the catalytic ability were also investigated. Based on radical scavenging experiments, it appeared that IO3 was the predominant reactive species in the I-GAC/IO4- system. The mechanism underlying the enhanced catalytic performance of I-GAC could be explained by the introduction of negatively charged I3- and I5- into I-GAC, which induced positive charge density on the surface of I-GAC. This accelerated the interaction between I-GAC and IO4-, and subsequently mediated the increasing generation of iodyl radicals (IO3). Furthermore, a possible degradation pathway of AO7 was proposed according to the intermediate products identified by gas chromatography-mass spectrometry.

Authors+Show Affiliations

State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. Electronic address: liuxt@bnu.edu.cn.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28476000

Citation

Li, Xiaowan, et al. "Enhanced Activation of Periodate By Iodine-doped Granular Activated Carbon for Organic Contaminant Degradation." Chemosphere, vol. 181, 2017, pp. 609-618.
Li X, Liu X, Lin C, et al. Enhanced activation of periodate by iodine-doped granular activated carbon for organic contaminant degradation. Chemosphere. 2017;181:609-618.
Li, X., Liu, X., Lin, C., Qi, C., Zhang, H., & Ma, J. (2017). Enhanced activation of periodate by iodine-doped granular activated carbon for organic contaminant degradation. Chemosphere, 181, 609-618. https://doi.org/10.1016/j.chemosphere.2017.04.134
Li X, et al. Enhanced Activation of Periodate By Iodine-doped Granular Activated Carbon for Organic Contaminant Degradation. Chemosphere. 2017;181:609-618. PubMed PMID: 28476000.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced activation of periodate by iodine-doped granular activated carbon for organic contaminant degradation. AU - Li,Xiaowan, AU - Liu,Xitao, AU - Lin,Chunye, AU - Qi,Chengdu, AU - Zhang,Huijuan, AU - Ma,Jun, Y1 - 2017/04/29/ PY - 2017/01/18/received PY - 2017/03/31/revised PY - 2017/04/26/accepted PY - 2017/5/6/pubmed PY - 2017/8/9/medline PY - 2017/5/6/entrez KW - Catalytic mechanism KW - Degradation pathway KW - Iodine-doped granular activated carbon KW - Periodate SP - 609 EP - 618 JF - Chemosphere JO - Chemosphere VL - 181 N2 - In this study, iodine-doped granular activated carbon (I-GAC) was prepared and subsequently applied to activate periodate (IO4-) to degrade organic contaminants at ambient temperature. The physicochemical properties of GAC and I-GAC were examined using scanning electron microscopy, N2 adsorption/desorption, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. No significant difference was observed between the two except for the existence of triiodide (I3-) and pentaiodide (I5-) on I-GAC. The catalytic activity of I-GAC towards IO4- was evaluated by the degradation of acid orange 7 (AO7), and superior catalytic performance was achieved compared with GAC. The effects of some influential parameters (preparation conditions, initial solution pH, and coexisting anions) on the catalytic ability were also investigated. Based on radical scavenging experiments, it appeared that IO3 was the predominant reactive species in the I-GAC/IO4- system. The mechanism underlying the enhanced catalytic performance of I-GAC could be explained by the introduction of negatively charged I3- and I5- into I-GAC, which induced positive charge density on the surface of I-GAC. This accelerated the interaction between I-GAC and IO4-, and subsequently mediated the increasing generation of iodyl radicals (IO3). Furthermore, a possible degradation pathway of AO7 was proposed according to the intermediate products identified by gas chromatography-mass spectrometry. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/28476000/Enhanced_activation_of_periodate_by_iodine_doped_granular_activated_carbon_for_organic_contaminant_degradation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(17)30676-8 DB - PRIME DP - Unbound Medicine ER -