Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron:performance and mechanism  

作　　者：Yuping Han Huanhuan Xu Guangzhou Wang Peiyuan Deng Lili Feng Yaoshen Fan Jiaxin Zhang 

机构地区：[1]North China University of Water Resources and Electric Power,Zhengzhou 450046,China [2]Henan Key Laboratory of Water Resources Conservation and Intensive Utilization in the Yellow River Basin,Zhengzhou 450046,People’s Republic of China [3]Yellow River Institute of Hydraulic Research,Yellow River Conservancy Commission,Zhengzhou 450003,Henan Province,China [4]Zhengzhou Normal University,Zhengzhou 450044,China [5]State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China

出　　处：《Biochar》2023年第1期1159-1173,共15页生物炭（英文）

基　　金：Study on Colloidal Coagulation and Heavy Metal Adsorption Mechanism of Sediment River(No.42007158);Study on the distribution characteristics of birds and the reduction technology of typical pollutants in their habitats in the Yellow River basin(Henan section)(No.23B180008)supported this research.

摘　　要：The intensification of estrogen non-point source pollution has drawn global attention due to their contribution to ecological environment problems worldwide,and it is critical to develop effective,economic and eco-friendly methods for reducing estrogens pollution.To address the agglomeration and oxidation of nano zero-valent iron(nZVI),biochar-nanoscale zero-valent iron composite(nZVI-biochar)could be a feasible choice for estrogens removal.This study summarized biochar and nZVI-biochar preparation,characterization,and unusual applications for estrone(E1),17β-estradiol(E2),and estriol(E3)removal.The properties of biochar and nZVI-biochar in characterization,effects of influencing factors on the removal efficiency,adsorption kinetics,isotherm and thermodynamics were investigated.The experiment results showed that nZVI-biochar exhibited the superior removal performance for estrogens pollutants compared to biochar.Based on the quasi-second-order model,estrogens adsorption kinetics were observed,which supported the mechanism that chemical and physical adsorption existed simultaneously on estrogens removal.The adsorption isotherm of estrogens could be well presented by the Freundlich model and thermodynamics studies explained that nZVI-biochar could spontaneously remove estrogens pollutants and the main mechanisms involvedπ-πinteraction,hydrophobic interaction,hydrogen bonding and degradation through ring rupture.The products analyzed by GC-MS showed that estrogens degradation was primarily attributed to the benzene ring broken,and Fe^(3+)promoted the production of free radicals,which further proved that nZVI-biochar had the excellent adsorption performances.Generally,nZVI-biochar could be employed as a potential material for removing estrogens from wastewater.

关 键 词：Biochar supported nanoscale zero-valent iron ESTROGENS Free radicals ADSORPTION DEGRADATION 

分 类 号：X703[环境科学与工程—环境工程]