rGO@nZVI-BC修饰的PRB增强糖皮质激素还原转化性能研究  

Enhancement of glucocorticoid reduction transformation by PRB modified with rGO@nZVI-BC

作　　者：孙博宇 韩东梅 马伟芳[1] SUN Bo-yu;HAN Dong-mei;MA Wei-fang(School of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China;Beijing Energy Conservation and Environmental Protection Center,Beijing 101160,China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083 [2]北京节能环保中心,北京101160

出　　处：《中国环境科学》2022年第7期3212-3223,共12页China Environmental Science

基　　金：国家自然科学基金资助项目(51678052)。

摘　　要：为制备环境功能材料rGO@nZVI-BC,以此材料构建可渗透反应墙(PRB)实现对地下水中含氟糖皮质激素(FGCs)的有效阻控.结果表明,阻控过程可用改进Yoon-Nelson模型描述,在r GO@n ZVI-BC和土壤系统中吸附速率和生物降解速率常数分别为0.485和0.035d^(-1)、0.233和0.029d^(-1).提升阻控效能的主要机理是强化吸附和生物降解功能.其中运行初期以吸附作用占主导,贡献比为76.12%左右.生物强化机制主要为n ZVI为GCs还原提供了电子供体,从而增强了还原脱氟功能,该部分贡献比约为87.06%,并伴随着脱羟基、氧化侧链降解和开环等降解.此外具有还原性脱卤属的功能性微生物(Xanthomonadaceae,Desulfuromonas和Sphingomonadaceae)物种丰度的增加进一步索证了功能材料r GO@nZVI-BC的效能.本研究为地下水中GCs的污染阻控提供了一种有效的方法.In order to synthesize an environmentally useful material,rGO@nZVI-BC,and to design a permeable reactive barrier(PRB)employing this material for the effective removal of fluorinated glucocorticoids(FGCs)from groundwater.The results indicated that the inhibitory process could be represented using an improved Yoon-Nelson model,with adsorption and biodegradation rate constants of 0.485 and 0.035d^(-1),0.233 and 0.029d^(-1),respectively,in rGO@nZVI-BC and soil systems.The primary mechanism for increasing the efficacy of the process is by strengthening the adsorption and biodegradation activities.At the first stage of operation,adsorption was found to be the dominant mechanism,accounting for approximately 76.12%of the total removal.The mechanism of bioaugmentation is that nZVI acts as an electron donor for the reduction of GCs,thus,enhancing the defluorination reduction function.This component contributed to approximately 87.06%of the total,which is accompanied by dehydroxylation,oxidative side chain degradation,and ring-opening degradation.Additionally,the increased relative abundance of the functional bacteria belonging to the reductive dehalogenation taxa(Xanthomonadaceae,Desulfuromonas,and Sphingomonadaceae)indicated the efficiency of [e-mail] research provides a practical strategy for preventing and controlling the contamination of groundwater.

关 键 词：可渗透反应墙 地下水 含氟糖皮质激素 还原降解 

分 类 号：X703[环境科学与工程—环境工程] X523