ScholarWorks@중앙대학교

초록

In this study, a Zn-based metal–organic framework (MOF) composite, Zn-H4dbp/GO-5, was engineered by integrating 5 wt% graphene oxide (GO) with Zn-H4dbp for the efficient adsorption and electrochemical detection of Cr(VI) in aqueous environments. The composite was synthesized via a hydrothermal method using 4,4′-dimethylenebiphenyl diphosphonic acid (H4dbp), Zn2+, and GO, achieving an exceptional Cr(VI) adsorption capacity of 311.8 mg g−1, which surpasses that of comparable materials. The adsorption mechanism followed the Freundlich isotherm and pseudo-second-order kinetic models, revealing multilayer chemisorption dominated by electrostatic interactions between the adsorbent and adsorbate. The composite material maintained over 80 % removal efficiency after five adsorption–desorption cycles, benefiting from deprotonated GO-enhanced hydrophobicity. Electrochemically, while Zn-H4dbp/Au showed superior Cr(VI) detection performance with enhanced reduction peak intensity, sensitivity (2.97 μA mg−1 L cm−2), and current density(j) (javer. –4.52 × 10−4 Acm−2), the insulating properties of GO limited the electrochemical response of Zn-H4dbp/GO composites. The Zn-H4dbp/Au sensor achieved a detection limit of 2.03 mg L−1 with a linear range of 2–100 mg L−1. These findings highlight Zn-H4dbp/GO-5 as an outstanding adsorbent for Cr(VI) removal and Zn-H4dbp/Au as a promising electrochemical sensor, positioning both materials as viable solutions for industrial wastewater treatment. © 2025 The Korean Society of Industrial and Engineering Chemistry

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