文献类型：期刊文献

英文题名：Efficiency and mechanisms of rhodamine B degradation in Fenton-like systems based on zero-valent iron

作者：Liang, Liping[1,2];Cheng, Liubiao[1];Zhang, Yuting[1];Wang, Qian[1];Wu, Qian[1];Xue, Yuanyuan[1];Meng, Xu[3,4]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Coll Life Sci, Shaoxing 312000, Peoples R China;[3]Shaoxing Univ, Coll Text & Garment, Shaoxing 312000, Peoples R China;[4]Shaoxing Univ, Key Lab Clean Dyeing & Finishing Technol Zhejiang, Shaoxing 312000, Peoples R China

年份：2020

卷号：10

期号：48

起止页码：28509

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000556199200006)、、EI(收录号：20203409090237)、Scopus(收录号：2-s2.0-85089685871)、WOS

基金：This research was financially supported by the National Natural Science Foundation of China (Grant No. 41807468), Zhejiang Provincial Natural Science Foundation of China (Grant No. LY18E080018), and State Key Laboratory of Pollution Control and Resource Reuse Foundation (No. PCRRF18021).

语种：英文

外文关键词：Chromophores - Dissolved oxygen - Free radicals - Iron - Iron compounds - Magnetite - Organic carbon - Oxidation - Redox reactions - Rhodamine B - Ultraviolet visible spectroscopy

外文摘要：Based on the Fe-0/H(2)O(2)heterogeneous Fenton system, the degradation of rhodamine B (RhB, an organic dye pollutant) was researched in this paper. The effects of initial pH value, concentration of H2O2, dosage of zero-valent iron (ZVI), and initial RhB concentration on RhB degradation by Fe-0/H(2)O(2)were studied. The results showed that when the initial pH = 4, dosage of ZVI was 9 mM, and concentrations of H(2)O(2)and RhB were 8 mM and 0.1 mM, respectively, the color of RhB could be completely faded within 30 min, and the total organic carbon (TOC) removal percentage was about 63% after 120 min. The dissolved oxygen (DO) content and oxidation-reduction potential (ORP) were monitored during the reaction. Quenching experiments with methanol confirmed that the degradation of the dye was mainly due to oxidation by the (OH)-O-. radical. Besides, the results from UV-Vis spectroscopy showed that the degradation of RhB was mainly due to the destruction of the conjugated oxygen hetero-anthracene in the RhB molecule. The solid-phase characterization of the ZVI samples after reaction confirmed that the original regular and slippery ZVI samples finally were corroded into rough and irregular lepidocrocite and magnetite. Two possible competitive reaction pathways for the degradation of RhB by Fe-0/H(2)O(2)were proposed by GC-MS analysis, which were attributed to the dissociation of ethyl radicals and the degradation of chromophore radicals.