文献类型：期刊文献

英文题名：Insight on the generation of reactive oxygen species in the CaO2/Fe(II) Fenton system and the hydroxyl radical advancing strategy

作者：Xue, Yunfei[1,2];Sui, Qian[1,2];Brusseau, Mark L.[3];Zhang, Xiang[1];Qiu, Zhaofu[1];Lyu, Shuguang[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Univ Arizona, Sch Earth & Environm Sci, Soil Water & Environm Sci Dept, Tucson, AZ 85721 USA

年份：2018

卷号：353

起止页码：657

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20183105642670);WOS:【SCI-EXPANDED(收录号:WOS:000441527900065)】；

基金：This study was financially supported by the grant from the Natural Science Foundation of Shanghai, China (16ZR1407200). The contributions of Mark Brusseau were supported by the NIEHS Superfund Research Program of United States (PS 42 ES04940).

语种：英文

外文关键词：Hydroxyl radical; Superoxide radical anion; CaO2/Fe(II) oxidation; ROSs yield; In situ chemical oxidation

摘要：Calcium peroxide (CaO2) is a stable hydrogen peroxide (H2O2) carrier, and the CaO2/Fe(II) system has been applied for treatment of various pollutants. It is commonly reported in the literature that hydroxyl radical (HO center dot) and superoxide radical anions (O-2(center dot-)) are the two main reactive oxygen species (ROSs) generated in the CaO2/Fe (II) system. However, many of the reported results were deduced from degradation performance rather than specific testing of radical generation. Thus, the specific generation of ROSs and the influence of system conditions on ROSs yield are still unclear. To our knowledge, this is the first study specifically focusing on the generation of HO center dot and O-2(center dot-) in the CaO2/Fe(II) system. Experimental conditions were optimized to investigate the production of HO center dot and O-2(center dot-). The results showed the influences of CaO2, Fe(II), and solution pH on HO% and O-2(center dot-) generation, and the HO center dot generation efficiency was reported for the first time. In addition, the ROSs generation pathways in the CaO2/Fe(II) system were elucidated. A strategy for enhancing HO center dot yield is developed, based on the continuously dosing Fe(II). This proposed strategy has implications for the effective application of in situ chemical oxidation employing CaO2/Fe(II) for groundwater remediation.