Regulation of tourmaline-mediated Fenton-like system by biochar: Free radical pathway to non-free radical pathway

化学 生物炭 电气石 罗丹明B 电子顺磁共振 亚甲蓝 降级(电信) 甲基橙 污染物 核化学 环境化学 光催化 光化学 催化作用 有机化学 材料科学 冶金 电信 物理 核磁共振 热解 计算机科学
作者
Yaoning Chen,Mengyang Zhao,Yuanping Li,Yihuan Liu,Li Chen,Hongjuan Jiang,Hui Li,Yanrong Chen,Han Yan,Suzhen Hou,Longbo Jiang
出处
期刊:Journal of Environmental Management [Elsevier BV]
卷期号:344: 118497-118497
标识
DOI:10.1016/j.jenvman.2023.118497
摘要

The heterogeneous Fenton-like systems induced by Fe-containing minerals have been largely applied for the degradation of organic pollutants. However, few studies have been conducted on biochar (BC) as an additive to Fenton-like systems mediated by iron-containing minerals. In this study, the addition of BC prepared at different temperatures was found to significantly enhance the degradation of contaminants in the tourmaline-mediated Fenton-like system (TM/H2O2) using Rhodamine B (RhB) as the target contaminant. Furthermore, the hydrochloric acid-modified BC prepared at 700 °C (BC700(HCl)) could achieve complete degradation of high concentrations of RhB in the BC700(HCl)/TM/H2O2 system. Free radical quenching experiments showed that TM/H2O2 system removed contaminants mainly mediated by the free radical pathway. After adding BC, the removal of contaminants is mainly mediated by the non-free radical pathway in BC700(HCl)/TM/H2O2 system which was confirmed by the Electron paramagnetic resonance (EPR) experiments and electrochemical impedance spectroscopy (EIS). In addition, BC700(HCl) had broad feasibility in the degradation of other organic pollutants (Methylene Blue (MB) 100%, Methyl Orange (MO) 100%, and tetracycline (TC) 91.47%) in the tourmaline-mediated Fenton-like system. Possible pathways for the degradation of RhB by the BC700(HCl)/TM/H2O2 system were also proposed.
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