Simultaneous removal of aniline, antimony and chromium by ZVI coupled with H2O2: Implication for textile wastewater treatment
Simultaneous removal of aniline, antimony and chromium by ZVI coupled with H2O2: Implication for textile wastewater treatment
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ZVI 与 H2O2 结合同时去除苯胺、锑和铬：对纺织废水处理的启示
DOI：
10.1016/j.jhazmat.2019.02.009
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发表时间：
2019-04-15
影响因子：
13.6
通讯作者：
Chen, Jiabin
中科院分区：
文献类型：
--
作者：
Gang, Xue;Wang, Qi;Chen, Jiabin
苯胺、锑(Sb)和铬(Cr3+)是纺织废水中典型的、可调控的共污染物，但对它们的去除往往是单独研究的。本文研究了ZVI与H_2O_2联用同时脱除苯胺、Sb和Cr。当投加量为0.5g L~(-1)ZVI和2 mM H_2O_2时，在pH为3的条件下，苯胺、Sb和Cr都能被完全去除。以异丙醇为自由基清除剂的实验证实，Fenton反应生成的(OH)-O-中心点对苯胺的降解起主要作用，但对Sb和Cr的去除作用不明显。H_2O_2加速了Fe(0)的腐蚀，生成了纳米铁(氢)氧化物。首先用(OH)-O-中心点降解苯胺，然后用铁(氢)氧化物吸附和共沉淀除去降解产物。铁(0)和铁(氢)氧化物都对Sb和Cr的去除起作用，但铁(氢)氧化物被确定为主要贡献者。X射线光电子能谱分析表明，Sb和Cr主要以Sb(III)和Cr(III)的形式被去除。通过对实际纺织废水的研究，证实ZVI与H_2O_2联用可有效去除苯胺、Sb和Cr，对纺织废水的深度处理具有重要意义。
Aniline, antimony (Sb) and chromium (Cr) are typical and regulated co-contaminants in textile wastewater, but their removal was often investigated individually. In this work, simultaneous removal of aniline, Sb and Cr by ZVI coupled with H2O2 was studied. With the dosage of 0.5 g L-1 ZVI and 2 mM H2O2, aniline, Sb and Cr can be removed completely at pH 3. Experiment with iso-propanol as the radical scavenger confirmed that (OH)-O-center dot derived from Fenton reaction accounts for aniline degradation, but not for Sb and Cr removal. H2O2 accelerated Fe(0) corrosion and generated the nanoscale iron(hydro)oxides. Aniline was degraded by (OH)-O-center dot first and then the degradation products were removed by iron(hydro)oxides via adsorption and co-precipitation. Both Fe(0) and iron (hydro)oxides were responsible for Sb and Cr removal, yet iron(hydro)oxides were identified as the major contributor. X-ray photoelectron spectroscopy analysis demonstrated that Sb and Cr were removed mainly as the states of Sb(III) and Cr(III). The real textile wastewater investigation confirmed that ZVI coupled with H2O2 can eliminate aniline, Sb and Cr effectively, which has important implications for the advanced treatment of textile wastewater.