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Fabrication of chitosan-modified magnetic durian shell biochar for removal of the microplastics
Summary
Researchers created a magnetic biochar material from durian shells modified with chitosan that can efficiently remove microplastics from wastewater, achieving removal rates up to 97%. The material works through a combination of surface interactions and can be magnetically recovered and reused up to five times while still maintaining over 76% effectiveness. This green, low-cost approach offers a promising new method for cleaning microplastic-contaminated water.
Microplastics (MPs) are an emerging threat to terrestrial ecosystems and have attracted global attention. In this study, durian shell was used as biochar raw material to provide magnetism, and then it was modified with chitosan to make chitosan-modified magnetic biochar (CMBC). The prepared CMBC was used to simulate the adsorption of MPs in sewage. Experimental results showed that the amount of CMBC was 0.1 g, pH was 10, the concentration of 160 mg/L had the optimal adsorption effect, the adsorption rate reached up to 97.22 %, and the adsorption capacity was 15.56 mg/g. According to the adsorption kinetic analysis, the adsorption process conformed to be the Freundlich model. The removal rate of MPs still remained at 76.41 % when CMBC, a green environmentally friendly adsorption material, was recycled for five times. This research broadens the understanding for the evaluation of magnetic biochar effectiveness in the adsorption of MPs pollution.