Research on adsorption behavior of microplastics for typical psychoactive drugs

WANG Ruixue; WANG Yuqi; ZHANG Chenglong; XU Yunyun

doi:10.13205/j.hjgc.202606014

Volume 44 Issue 6

Jun. 2026

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2026 > 44(6): 138-147

WANG Ruixue, WANG Yuqi, ZHANG Chenglong, XU Yunyun. Research on adsorption behavior of microplastics for typical psychoactive drugs[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 138-147. doi: 10.13205/j.hjgc.202606014

Citation:

WANG Ruixue, WANG Yuqi, ZHANG Chenglong, XU Yunyun. Research on adsorption behavior of microplastics for typical psychoactive drugs[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 138-147. doi: 10.13205/j.hjgc.202606014

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Research on adsorption behavior of microplastics for typical psychoactive drugs

doi: 10.13205/j.hjgc.202606014

School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China

Received Date: 2025-10-10
Accepted Date: 2025-11-05
Rev Recd Date: 2025-10-23

Available Online: 2026-07-06

Abstract

Abstract

As an emerging environmental pollutant， microplastics can adsorb psychotropic drugs in aquatic environments， followed by continuous migration and transformation， ultimately contributing to environmental pollution. To investigate the adsorption behavior and mechanism of microplastics for psychotropic drugs， four types of microplastics （PE， PP， PS， and PVC） with a particle size of 50 μm were selected as the experimental subjects， and three psychotropic drugs （diazepam， fluoxetine， and mianserin） were used to simulate the adsorption of these drugs by microplastics in water. The kinetic characteristics， adsorption isotherms， as well as the effects of pH and salinity on adsorption were examined. By fitting and analyzing the experimental data of the adsorption of psychotropic drugs by the four types of microplastics using the Langmuir and Freundlich isothermal adsorption models， it was found that PE adsorbed fluoxetine better， PP adsorbed mianserin better， and PVC adsorbed diazepam better， while a certain linear characteristic was observed in the adsorption of fluoxetine by PS. When the pH value of natural surface water ranged between 6.5 and 8.5， the adsorption of diazepam by microplastics reached a maximum. With an increase in NaCl concentration， the equilibrium adsorption capacity of diazepam in the solution also gradually increased. This is because the adsorption of diazepam is dominated by non-electrostatic interactions， and increasing the ionic strength can enhance the adsorption capacity of microplastics for diazepam in water.
- microplastics,
- psychoactive drugs,
- adsorption kinetics,
- adsorption isotherm,
- adsorption mechanism

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References(28)

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