Amino-Modified ZIF-90 for Effective Adsorption of Au(III) in Environmental Water.

Zhou, Na; Wu, Xueli; Wang, Shaoxia; Qu, Jianfei; Tan, Yang; Luan, Chuanlei; Yin, Xiuli; Wu, Xuran; Zhuang, Xuming

In this work, amino-modified ZIF-90 (NH2-ZIF-90) was prepared by using butylamine as a modifier, and its effectiveness in adsorbing Au(III) from environmental samples was investigated. The morphology and structure of NH2-ZIF-90 were analyzed via SEM, XRD, FT-IR, and XPS. Optimal adsorption occurred after 12 h of shaking in a pH = 5 aqueous solution with 2 mg mL−1 NH2-ZIF-90. The adsorption kinetics conformed to a pseudo-second-order model, and the equilibrium data fit the Freundlich isotherm model well. Finally, NH2-ZIF-90 was successfully used in lake water and tap water samples for Au(III) adsorption, with recovery rates ranging from 81.0% to 93.3%. This study presents a novel approach for addressing Au(III) adsorption challenges.

DRINKING water; ADSORPTION kinetics; ENVIRONMENTAL sampling; WATER sampling; AQUEOUS solutions

Molecules, 2025, Vol 30, Issue 8, p1826

1420-3049

Academic Journal

10.3390/molecules30081826