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| The characteristics and mechanisms of microplastic adsorption by ciprofloxacin in the presence of heavy metals |
| Received:November 21, 2020 |
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| KeyWord:microplastic;antibiotic;heavy metal;adsorption |
| Author Name | Affiliation | E-mail | | LIU Di | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | | | TONG Fei | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | | | GAO Yan | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | | | LU Xin | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | | | FAN Guang-ping | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | | | ZHANG Ya-xiang | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | | | ZHANG Zhen-hua | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in the Lower Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing 210014, China | zhenhuaz70@hotmail.com |
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| Abstract: |
| To determine the characteristics of microplastic adsorption when these materials co-occurring with heavy metals and antibiotics, we studied the adsorption behavior and mechanisms of ciprofloxacin(CIP) for polyamide(PA) and polyvinyl chloride(PVC) in the presence of the heavy metals Cu and Cd, based on batch adsorption experiments. The results showed that the adsorption of PA and PVC by CIP conformed to the Langmuir and Freundlich equations. The maximum adsorption capacities of CIP for PA and PVC based on the Langmuir equation were 1.846 mg·g-1 and 1.862 mg·g-1, respectively. The adsorption of the two microplastics by CIP at different pH values revealed a trend of initial increase followed by a decrease, with the adsorptive capacity reaching a maximum value at pH 6. In the presence of Cu and Cd, the adsorption isotherms were more in line with predictions of the Langmuir equation. Whereas the presence of Cu inhibited microplastic adsorption by CIP, the presence of Cd promoted a significant increase in adsorption. At a given pH value, there was no significant change in the adsorptive capacity of CIP for microplastics in the presence of Cu or Cd. In addition, electrostatic and polar interactions were identified as important mechanisms underlying the adsorption of the two microplastics by CIP. The adsorption of PVC by CIP was found to be predominantly attributable to physical adsorption, whereas the adsorption of PA involves the formation of hydrogen bonds between amide and carbonyl groups. However, although the presence of heavy metals(Cu and Cd) can modify the adsorptive capacity of CIP for the two assessed microplastics, it does not affect the mechanisms whereby CIP adsorbs PA and PVC. |
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