Remediation of preservative ethylparaben in water using natural sphalerite:Kinetics and mechanisms  

作　　者：Yanpeng Gao Teng Guo Xiaolin Niu Na Luo Jia Chen Junlang Qiu Yuemeng Ji Guiying Li Taicheng An 

机构地区：[1]Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health,Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control,Institute of Environmental Health and Pollution control,Guangdong University of Technology,Guangzhou 510006,China [2]Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control,Key Laboratory of City Cluster Environmental Safety and Green development,School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China [3]Division of Analytical and Environmental Toxicology,Department of Laboratory Medicine and Pathology,Faculty of Medicine and Dentistry,University of Alberta,Edmonton,AB T6G 2G3,Canada

出　　处：《Journal of Environmental Sciences》2022年第3期72-80,共9页环境科学学报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China (Nos.41977365and 41425015);the National Key Research and Development Program of China (No.2019YFC1804503);the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (No.2017BT01Z032) Natural Sciences and Engineering Research Council of Canada;the Canada Research Chairs Program;Alberta Innovates;Alberta Health for their support;support of Guangdong University of Technology for her visiting scholarship.

摘　　要：As a typical class of emerging organic contaminants(EOCs), the environmental transformation and abatement of preservative parabens have raised certain environmental concerns. However, the remediation of parabens-contaminated water using natural matrixes(such as, naturally abundant minerals) is not reported extensively in literature. In this study, the transformation kinetics and the mechanism of ethylparaben using natural sphalerite(NS) were investigated. The results show that around 63% of ethylparaben could be absorbed onto NS within 38 hr, whereas the maximum adsorption capacity was 0.45 mg/g under room temperature. High temperature could improve the adsorption performance of ethylparaben using NS. In particular, for the temperature of 313 K, the adsorption turned spontaneous. The well-fitted adsorption kinetics indicated that both the surface adsorption and intra-particle diffusion contribute to the overall adsorption process. The monolayer adsorption on the surface of NS was primarily responsible for the elimination of ethylparaben. The adsorption mechanism showed that hydrophobic partitioning into organic matter could largely govern the adsorption process, rather than the Zn S that was the main component of NS. Furthermore, the ethylparaben adsorbed on the surface of NS was stable, as only less than 2% was desorbed and photochemically degraded under irradiation of simulated sunlight for 5 days. This study revealed that NS might serve as a potential natural remediation agent for some hydrophobic EOCs including parabens, and emphasized the significant role of naturally abundant minerals on the remediation of EOCs-contaminated water bodies.

关 键 词：Emerging organic contaminants PARABEN Naturally abundant minerals Natural sphalerite Adsorption mechanism 

分 类 号：X52[环境科学与工程—环境工程]