标题：Chemical oxidation of benzene and trichloroethylene by a combination of peroxymonosulfate and permanganate linked by in-situ generated colloidal/amorphous MnO2作者：Cui, JX (Cui, Jiaxin); Zhang, LY (Zhang, Lieyu); Xi, BD (Xi, Beidou); Zhang, J (Zhang, Jing); Mao, XH (Mao, Xuhui)

来源出版物：CHEMICAL ENGINEERING JOURNAL卷：313 页码：815-825 DOI： 10.1016/j.cej.2016.12.104 出版年：APR 1 2017

摘要：The present study demonstrates the effectiveness of a novel oxidant system, namely the combined use of peroxymonosulfate (PMS) and permanganate (CUPP), for the degradation of benzene and trichloroethylene (TCE) in simulated groundwater. The CUPP process exhibited favorable oxidizing capability because the in-situ generated colloidal and amorphous MnO2 linked the two oxidants. Compared with the separate use of permanganate or peroxymonosulfate, the CUPP process showed much better efficiency for the removal of refractory benzene. According to the electron paramagnetic resonance analysis and PMSactivating experiments, both colloidal and amorphous MnO2 (AM-MnO2) triggered the radical mediated oxidation, but the AM-MnO2-activated PMS showed an adsorption-dependent oxidizing capability. For the CUPP process, higher temperatures promoted the initial degradation rate of benzene, but did not change its final removal efficiency. The degradation of benzene was mostly associated with the activated PMS, and the intermediates also competed with TCE for KMnO4. The KMnO4 component played a more important role than PMS for the removal of TCE. For an aqueous mixture of 0.3 mM benzene and TCE, the combination of 2.4 mM PMS and 1.8 mM KMnO4 was optimal, achieving removal efficiencies higher than 85% for both pollutants. Regarding the degradation of benzene, chloride ions had a concentration-dependent effect, and bicarbonate ions and dihydrogen phosphate showed different levels of retarding effect. The CUPP is envisaged to be used as a remedial reagent for the in-situ chemical oxidation of groundwater contaminants.

入藏号：WOS:000394723200083

文献类型：Article

语种：English

作者关键词：Chemical oxidation remediation; Peroxymonosulfate; Permanganate; Colloidal MnO2; Amorphous MnO2; Groundwater

扩展关键词：THERMALLY ACTIVATED PERSULFATE; CATALYTIC PHENOL DEGRADATION; POTASSIUM-PERMANGANATE; HYDROGEN-PEROXIDE; AQUEOUS-SOLUTIONS; HETEROGENEOUS ACTIVATION; CONTAMINATED GROUNDWATER; MN(IV)-CONTAINING OXIDES; TRANSFORMATION PRODUCTS; CHLORINATED ETHYLENES

通讯作者地址：Mao, XH (reprint author), Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址：clab@whu.edu.cn

地址：

[Cui, Jiaxin; Xi, Beidou; Zhang, Jing; Mao, Xuhui] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

[Zhang, Lieyu; Xi, Beidou] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China.

[Mao, Xuhui] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.

研究方向：Engineering

ISSN：1385-8947

eISSN:1873-3212

影响因子：5.31