Investigation on the adsorption and desorption behaviors of antibiotics by degradable MPs with or without UV ageing process

Xiulei Fan; Yefeng Zou; Nan Geng; Jiaqiang Liu; Jun Hou; Dandan Li; Chengfang Yang; Ying Li

doi:10.1016/j.jhazmat.2020.123363

Investigation on the adsorption and desorption behaviors of antibiotics by degradable MPs with or without UV ageing process

J Hazard Mater. 2021 Jan 5:401:123363. doi: 10.1016/j.jhazmat.2020.123363. Epub 2020 Jul 2.

Authors

Xiulei Fan¹, Yefeng Zou², Nan Geng³, Jiaqiang Liu², Jun Hou⁴, Dandan Li⁵, Chengfang Yang², Ying Li²

Affiliations

¹ Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province, College of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China. Electronic address: xlfan@xzit.edu.cn.
² Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province, College of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China.
³ College of Water Conservancy and Environment Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, China.
⁴ Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China. Electronic address: hhuhjyhj@126.com.
⁵ Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.

PMID: 32650105
DOI: 10.1016/j.jhazmat.2020.123363

Abstract

To assess the potential vector effects of degradable MPs (microplastics) on the coexisting pollutant, the adsorption-desorption behaviors of tetracycline (TC) and ciprofloxacin (CIP) by the original and aged polylactic acid (PLA) was investigated. Compared with PVC, the physicochemical properties of PLA changed more observably during the UV ageing. The original smooth surface of PLA appeared holes and cracks, and the S_BET of PLA increased a 2.66-fold after the aging experiments. During the ageing processes, the hydrophily of aged MPs was also enhanced due to the increase of oxygen-containing functional groups. And the zeta potential of PLA decreased from -7.79 to -13.51 mV and PVC from -4.96 to -8.34 mV, respectively. In adsorption experiment, both the original and aged PLA showed better vector effects for antibiotics than PVC. The ageing factor increased the adsorption capacity of antibiotics on PLA 1.18-2.19 times. The desorption experiments showed that the desorption amount of antibiotics on MPs in simulated intestinal fluid was greater than that in Milli-Q water. On this basis, the desorption capacity of antibiotics with PLA was better than that of PVC, which proved that the potential negative impact of PLA on the aquatic environment and organisms might be more serious.

Keywords: Adsorption; Aging; Antibiotics; Degradable MPs; Desorption.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Anti-Bacterial Agents
Plastics*
Water Pollutants, Chemical* / analysis

Substances

Anti-Bacterial Agents
Plastics
Water Pollutants, Chemical