文献类型：期刊文献

英文题名：Co-catalysis of trace dissolved Fe(iii) with biochar in hydrogen peroxide activation for enhanced oxidation of pollutants

作者：Feng, Dongqing[1];Shou, Jianxin[2];Guo, Sen[1];Ya, Mengna[1];Li, Jianfa[1];Dong, Huaping[1];Li, Yimin[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Coll Life Sci, Shaoxing 312000, Zhejiang, Peoples R China

年份：2022

卷号：12

期号：27

起止页码：17237

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000809616600001)、、EI(收录号：20222812337988)、Scopus(收录号：2-s2.0-85133603348)、WOS

基金：1 This work was kindly supported by National Natural Science Foundation of China (No. 21777103 and 21677101), and Natural Science Foundation of Zhejiang Province of China (LY16B070004).

语种：英文

外文摘要：Activation of hydrogen peroxide (H2O2) with biochar is a sustainable and low-cost approach for advanced oxidation of organic pollutants, but faces the challenge of a low yield of hydroxyl radical (OH). Herein, we hypothesize that the activation efficiency of H2O2 can be enhanced through co-catalysis of trace dissolved iron (Fe) with biochar. Two biochar samples derived from different feedstock, namely LB from liquor-making residue and WB from wood sawdust, were tested in the co-catalytic systems using trace Fe(iii) (0.3 mg L-1). The cumulative OH production in [Fe(iii) + LB]/H2O2 was measured to be 3.28 times that in LB/H2O2, while the cumulative OH production in [Fe(iii) + WB]/H2O2 was 11.9 times that in WB/H2O2. No extra consumption of H2O2 was observed in LB/H2O2 or WB/H2O2 after addition of trace Fe(iii). Consequently, the reaction rate constants (k(obs)) for oxidation of pollutants (2,4-dichlorophenoxyacetic acid and sulfamethazine) were enhanced by 3.13-9.16 times. Other iron species including dissolved Fe(ii) and iron minerals showed a similar effect on catalyzing 2,4-D oxidation by biochar/H2O2. The interactions involved in adsorption and reduction of Fe(iii) by biochar in which the defects acted as electron donors and oxygen-containing functional groups bridged the electron transfer. The fast regeneration of Fe(ii) in the co-catalytic system resulted in the sustainable OH production, thus the efficient oxidation of pollutants comparable to other advanced oxidation processes was achieved by using dissolved iron at a concentration as low as the concentration that can be found in natural water.