Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun, 113001, China.
Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun, 113001, China.
Chemosphere. 2019 Dec;237:124454. doi: 10.1016/j.chemosphere.2019.124454. Epub 2019 Jul 26.
This study investigated the degradation of norfloxacin by persulfate activated with corn stalk biochar. The results demonstrate that corn stalk biochar is a green and low-cost carbon material with excellent catalytic activity for the metal-free activation of persulfate to degrade norfloxacin. The removal rate of norfloxacin increased with the increase in the dosage of persulfate, but the increased ratio gradually decreased. With alcohols and phenols as free radical trapping agents, it was determined that norfloxacin degradation by SO- 4· and HO· in the biochar/persulfate system occurred mainly on the surface or boundary layer of biochar. pH has an important effect on norfloxacin degradation in the biochar/persulfate system. Norfloxacin degradation performances under different initial pH conditions are decreased according to the following order: (initial pH 6.5) > (initial pH 3.4) > (initial pH 10.6). The effects of pH on norfloxacin degradation in the biochar/persulfate system was mainly realized through affecting norfloxacin adsorption on corn stalk biochar surface.
本研究考察了过硫酸盐在玉米秸秆生物炭活化下对诺氟沙星的降解情况。结果表明，玉米秸秆生物炭是一种绿色、低成本的碳材料，对过硫酸盐的无金属活化具有优异的催化活性，可用于降解诺氟沙星。诺氟沙星的去除率随着过硫酸盐用量的增加而增加，但增加的比例逐渐减小。通过醇类和酚类作为自由基捕获剂，确定了生物炭/过硫酸盐体系中 SO- 4·和 HO· 主要通过生物炭的表面或边界层来降解诺氟沙星。pH 值对生物炭/过硫酸盐体系中诺氟沙星的降解有重要影响。不同初始 pH 值条件下诺氟沙星的降解性能按以下顺序降低：（初始 pH 6.5）＞（初始 pH 3.4）＞（初始 pH 10.6）。pH 值对生物炭/过硫酸盐体系中诺氟沙星降解的影响主要是通过影响诺氟沙星在玉米秸秆生物炭表面的吸附来实现的。
