Differential effects of polystyrene microplastics on the adsorption of cadmium and ciprofloxacin by tea leaf litter-derived magnetic biochar: Influencing factors and mechanisms.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Environment Research Pub Date : 2024-09-01 DOI:10.1002/wer.11117
Xiaoming Gong, Ranran Chen, Guanwei Shi, Haibo Sun, Yang Yang, Yunshan Liang, Pufeng Qin, Huilin Yang, Zhibin Wu
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Abstract

Water pollution involves the coexistence of microplastics (MPs) and traditional pollutants, and how can MPs influence the adsorption of other pollutants by biochar during the treatment process remains unclear. This study aimed to investigate the influence of polystyrene microplastics (PS MPs) on the adsorption of cadmium (Cd) and ciprofloxacin (CIP) by magnetic biochar (MTBC) in the single and binary systems. MTBC was prepared using tea leaf litter; the effects of time, pH, and salt ions on the adsorption behaviors were investigated; and X-ray photoelectronic spectroscopy (XPS) and density flooding theory analysis were conducted to elucidate the influence mechanisms. Results indicated that PS MPs reduced the pollutants adsorption by MTBC due to the heterogeneous aggregation between PS MPs and MTBC and the surface charge change of MTBC induced by PS MPs. The effects of PS MPs on heavy metals and antibiotics adsorption were distinctly different. PS MPs reduced Cd adsorption on MTBC, which were significantly influenced by the solution pH and salt ions contents, suggesting the participation of electrostatic interaction and ion exchange in the adsorption, whereas the effects of PS MPs on CIP adsorption were inconspicuous. In the hybrid system, PS MPs reduced pollutants adsorption by MTBC with 66.3% decrease for Cd and 12.8% decrease for CIP, and the more remarkable reduction for Cd was due to the predominated physical adsorption, and CIP adsorption was mainly a stable chemisorption. The influence of PS MPs could be resulted from the interaction between PS MPs and MTBC with changing the functional groups and electrostatic potential of MTBC. This study demonstrated that when using biochar to decontaminate wastewater, it is imperative to consider the antagonistic action of MPs, especially for heavy metal removal. PRACTITIONER POINTS: Magnetic biochar (MTBC) was prepared successfully using tea leaf litter. MTBC could be used for cadmium (Cd) and ciprofloxacin (CIP) removal. Polystyrene microplastics (Ps MPs) reduced Cd/CIP adsorption by MTBC. Ps MPs effects on Cd adsorption were more obvious than that of CIP. Ps MPs changed the functional groups and electrostatic potential of MTBC, thus influencing MTBC adsorption.

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聚苯乙烯微塑料对茶叶渣磁性生物炭吸附镉和环丙沙星的不同影响:影响因素和机制
水污染涉及微塑料(MPs)和传统污染物的共存,而在处理过程中,微塑料如何影响生物炭对其他污染物的吸附仍不清楚。本研究旨在探讨聚苯乙烯微塑料(PS MPs)对磁性生物炭(MTBC)在单一和二元体系中吸附镉(Cd)和环丙沙星(CIP)的影响。利用茶叶渣制备了磁性生物炭,研究了时间、pH 值和盐离子对吸附行为的影响,并通过 X 射线光电子能谱(XPS)和密度泛滥理论分析阐明了影响机制。结果表明,由于 PS MPs 与 MTBC 的异质聚集以及 PS MPs 诱导的 MTBC 表面电荷变化,PS MPs 可降低 MTBC 对污染物的吸附量。PS MPs 对重金属和抗生素的吸附效果明显不同。PS MPs降低了MTBC对镉的吸附,而镉的吸附受溶液pH值和盐离子含量的影响较大,这表明吸附过程中存在静电作用和离子交换作用,而PS MPs对CIP的吸附作用不明显。在混合体系中,PS MPs 降低了 MTBC 对污染物的吸附,对 Cd 的吸附降低了 66.3%,对 CIP 的吸附降低了 12.8%,对 Cd 的吸附降低更为显著的原因是物理吸附占主导地位,而对 CIP 的吸附主要是稳定的化学吸附。PS MPs 的影响可能是由于 PS MPs 与 MTBC 之间的相互作用改变了 MTBC 的官能团和静电位。这项研究表明,在使用生物炭净化废水时,必须考虑 MPs 的拮抗作用,尤其是对重金属的去除。实践点:利用茶叶渣成功制备了磁性生物炭(MTBC)。MTBC 可用于去除镉(Cd)和环丙沙星(CIP)。聚苯乙烯微塑料(Ps MPs)减少了 MTBC 对 Cd/CIP 的吸附。与 CIP 相比,Ps MPs 对 Cd 的吸附效果更为明显。聚苯乙烯微塑料改变了 MTBC 的官能团和静电位,从而影响了 MTBC 的吸附。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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