Abstract
Microplastics (MPs) were found to be a novel carrier for tetracycline (TC) in aquatic environments. Therefore, the synergistic adsorption treatment of TC in water based on biochar (BC) and MPs was explored in this study. Polyethylene, polypropylene, and polyvinyl chloride were selected for aging treatment and added to biochar obtained from vitamin C-modified crayfish shells (CSB-VC), which performed best in preliminary adsorption experiments. The pseudo second order kinetic model and Freundlich isotherm model are more suitable for describing the synergistic adsorption process. Under the synergistic effects of CSB-VC-PE, CSB-VC-PP, and CSB-VC-PVC, the saturation adsorption capacities were determined as 275.99 mg/g, 275.24 mg/g, and 284.48 mg/g, respectively. In actual water experiments, the four adsorption systems still exhibit good synergistic performance with Qe > 245 mg/g. Characterization, experiments, and DFT calculations confirm that van der Waals force, hydrogen bonding and electrostatic interaction were the main adsorption mechanisms in the synergistic interactions between CSB-VC and MPs. The study of the synergistic adsorption mechanism between biochar and MPs provides a foundation for further comprehensive research on the sustainable development of complex solutions to various environmental pollution problems.
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