文献类型：期刊文献

英文题名：Biochar enhanced the degradation of organic pollutants through a Fenton process using trace aqueous iron

作者：Feng, Dongqing[1];Lu, Jinhong[1];Guo, Sen[1];Li, Jianfa[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China

年份：2021

卷号：9

期号：1

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000615221100008)、、EI(收录号：20205009622857)、Scopus(收录号：2-s2.0-85097492680)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Nos. 21777103 and 41271475).

语种：英文

外文关键词：Biochar; Advanced oxidation; 2,4-D; Fenton reaction; Hydroxyl radical production; Fe(III)/Fe(II) cycling

外文摘要：The Fenton process is among the most popular technique for oxidation of organic pollutants, but faces the challenges of slow Fe(III)/Fe(II) cycling, limited (OH)-O-center dot production, and the by-production of hazardous ironcontaining sludge. In this work, two biochars (LB700 and LB500) were added in a Fenton process using trace aqueous iron (0.2-1.8 mg/L), so as to enhance the degradation of organic pollutants while minimizing the production of iron-containing sludge. The results indicate that the addition of biochar in the Fenton process accelerated the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-dichlorophenol (2,4-DCP). The pseudo-first order rate constants (Irobs) for 2,4-D degradation in the combined biochar and Fe(II)/H2O2 systems are enhanced to 3.09-4.97 times that in the homogenous Fe(II)/H2O2 system and 4.61-5.80 times that in the biochar/H2O2 systems. The mechanism investigations using electron spin resonance (ESR) and a chemical probe method indicate that addition of biochar increased the cumulative production of (OH)-O-center dot in Fenton system, and the high temperature biochar LB700 led to more (OH)-O-center dot production and consequently quicker 2,4-D degradation. The biochar can also facilitate the Fe(III)/Fe(II) cycling and initiate the Fenton-like oxidation of 2,4-D using trace aqueous Fe(III). This research work suggests a facile and environmentally friendly way to enhance the efficiency of advanced oxidation of refractory pollutants.