微塑料对土壤中镉吸附与解吸特性的影响
Effect of Microplastics on the Adsorption and Desorption Properties of Cadmium in Soil.
作者信息
Chen Su, Feng Tianzhen, Lin Xiaonan, Hou Ziyan, Chao Lei, Zhang Xiaoying, Liu Ying, Li Jiaqi
机构信息
Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang, 110044, People's Republic of China.
Shenyang Jianzhu University, Shenyang, 110168, People's Republic of China.
出版信息
Bull Environ Contam Toxicol. 2022 Dec 31;110(1):33. doi: 10.1007/s00128-022-03669-2.
This study analyzed the role of micro polyethylene (mPE) and micro polypropylene (mPP) on cadmium (Cd) adsorption and desorption in soil. Cd adsorption in soils reached equilibrium within 240 min with or without mPP/mPE. The largest Cd adsorption amount was 923.88 mg kg in the control treatment (no MPs). The Cd adsorption amount in the mPP treatment was 872.21 mg kg, greater than that in the mPE treatment (780.21 mg kg). MPs reduced the soil adsorption of Cd to some extent. Soils supplemented with mPE were more inhibitory to Cd adsorption than mPP. The pseudo-second-order model equation proved to be the most optimal equation for describing Cd adsorption dynamics in the presence of different MPs, while the Freundlich equation was best for describing isothermal adsorption of Cd in the presence of MPs. MPs facilitate the desorption of metals from the soil.
本研究分析了微聚乙烯（mPE）和微聚丙烯（mPP）对土壤中镉（Cd）吸附和解吸的作用。无论有无mPP/mPE，土壤中Cd的吸附在240分钟内达到平衡。对照处理（无微塑料）中最大的Cd吸附量为923.88毫克/千克。mPP处理中的Cd吸附量为872.21毫克/千克，大于mPE处理中的吸附量（780.21毫克/千克）。微塑料在一定程度上降低了土壤对Cd的吸附。添加mPE的土壤比mPP对Cd吸附的抑制作用更强。伪二级模型方程被证明是描述不同微塑料存在下Cd吸附动力学的最优方程，而Freundlich方程最适合描述微塑料存在下Cd的等温吸附。微塑料促进了金属从土壤中的解吸。
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