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Engineered ZIF-8 Grown on Polydopamine-Functionalized Melamine Foam for Enhanced Adsorption of Chlortetracycline
Wenhao Bao1, Bizhi Lv1, Linqiong Xu1
1Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, Institute of Mass Spectrometry, School of Materials Science and Chemical Engineering, Ningbo University, 315211 Ningbo, P.R. China.
Abstract:
A macroscopic P-ZIF-8/PDA/MF adsorbent was fabricated by substituting conventional zinc precursors with layered porous zinc oxide (P-ZnO) on polydopamine (PDA)-functionalized melamine foam (MF). The composite exhibited exceptional adsorption capacity for chlortetracycline hydrochloride from wastewater, with a Langmuir-modeled maximum of 1320 mg/g at pH 6. Systematic evaluation of environmental parameters─including pH gradients, ionic strength variations, and competitive ion interference─revealed robust performance under various aqueous conditions. In addition, FT-IR and XPS analyses were performed to characterize P-ZIF-8/PDA/MF both prior to adsorption and following the adsorption process in order to clarify its adsorption behavior. The analysis indicates that the uptake by P-ZIF-8/PDA/MF mainly proceeds through monolayer chemisorption, which results from the combined contributions of hydrogen-bond interactions, π-π stacking, and pH-dependent electrostatic attraction.
