Abstract
2,4-Dichlorophenoxyacetic acid (2,4-D) is one of the most widely used pesticides in the world, which pose hazardous effects to the aquatic environment and human health due to its long-term and extensive use. In this work, MOF-808-Cys with highly water stable was prepared by one-pot method using L-cysteine modified Zr-based organic framework. Cysteine confers a variety of functional groups to MOF-808, enabling its chemical binding to the target substrate 2,4-dichlorophenylacetic acid (2,4-D). Adsorption experiments reveal that MOF-808-Cys has a higher adsorption efficiency (90%) toward 2,4-D than pristine MOF-808 (75%). Moreover, the adsorption kinetics confirms that the adsorption behavior follows a pseudo-second-order model with intraparticle diffusion. Experimental and characterization analysis show that physical adsorption and chemisorption synergistic improved adsorption capacity and adsorption efficiency. The -NH2 and -SH moiety are introduced into MOF-808 to enhance the adsorption performance by chemical adsorption. This study provides an effectively strategy of functional group modification to enhance the adsorption of pesticides and antibiotic pollutants in wastewater.
Published Version
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