过氧二硫酸盐
生物炭
化学
腐植酸
罗丹明B
激进的
电子转移
催化作用
光化学
猝灭(荧光)
动力学
降级(电信)
过硫酸盐
电化学
无机化学
光催化
荧光
有机化学
电信
肥料
物理
电极
量子力学
热解
物理化学
计算机科学
作者
Zezhuang Cao,Jinlan Xu,Wenfa Tan,Huan Tang,Huan Li,Yikai Li
标识
DOI:10.1016/j.molliq.2024.123962
摘要
Sulfate radical advanced technologies (SR-AOPs) has been increasingly applied for chemical oxidation of toxic wastewater treatment, while the sluggish kinetics of Fe(III)/Fe(II) cycling remains a serious problem in its application. In this study, a novel co-catalyst of humic acid-Fe incorporated biochar (HA-Fe@BC) was successfully synthesized that can greatly accelerate the Fe(II) regeneration. More than 95 % organic pollutants could be degraded in HA-Fe@BC/peroxydisulfate (PDS) system, especially for the model pollutant Rhodamine B (an almost 8.0-fold kinetic increase). More excitingly, the superior catalytic activity of HA-Fe@BC for PDS activation may be attributed to the ample surface C-OH and C=O groups, accelerated electron transfer and formed surface HA-Fe@BC-PDS* complex with efficient oxidation activity. Radical capture, quenching experiments and electrochemical analysis confirmed that the HA-Fe@BC/PDS was caused by radicals (SO4•-+ O2•-+•OH = 68.13 %) and non-radical (surface-mediated electron transfer and 1O2 = 26.33 %) pathways. Besides, it also exhibited anti-interference performance against anions and organic matter (eg. Cl-, Br-, NO3–, and PO43-). Furthermore, the degradation pathways were proposed by LC-MS assisted with density functional theory (DFT) calculations, and the mechanism was proposed comprehensively. This work demonstrates the PDS activation by HA-Fe@BC through free radical and non-free radical pathways, which provides insight into application of biochar-based materials for wastewater treatment.
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