Synthesis of Ag-HKUST-1 composites and adsorption performance of neutral red dye

• Published in: Inorganic chemistry communications 2024-09, Vol.167, p.112757, Article 112757
• Main Authors: Liang, Yumin, Liu, Chenhui, Ma, Zhiyu, Gao, Jiyun, Wu, Yanxin
• Format: Article
• Language: English
• Subjects: Adsorption; Ag-HKUST-1; Metal-organic frameworks; Neutral red
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2024.112757

[Display omitted] •Ag-HKUST-1 composite material were synthesized by impregnating Ag+ into the HKUST-1 precursor solution using the impregnation method.•The adsorption of AH1 on NR is consistent with the Langmuir model and the pseudo-second-order kinetic model.•Ag-HKUST-1 composite material have better stability and recyclability.•The possible mechanism of NR adsorption by Ag-HKUST-1 composite materials was proposed through experiments and kinetic fitting. HKSUT-1 is often used as an adsorbent because of its excellent adsorption properties. In this study, Ag+ was impregnated into the HKSUT-1 precursor solution using the impregnation method, with sodium borohydride (NaBH4) serving as the reducing agent. This was done to examine the removal efficiency of NR dye. The Ag-HKSUT-1 composites were prepared by varying the additions of AgNO3 and NaBH4. The morphology and structure of the Ag-HKSUT-1 composites were characterized by TG, FT-IR, BET and TEM. The adsorption performance of AH1 for neutral red dye in wastewater was investigated. The adsorption process was described by the Langmuir model and the pseudo-second-order kinetic model. The adsorption capacity of AH1 for NR dye at 298 K was calculated to be 64.59 mg/g, indicating that Ag-HKUST-1 effectively adsorbed NR dye. The adsorption process is driven by a chemisorption mechanism, where intermolecular forces between Ag-HKUST-1 and NR, electrostatic interactions, and π-π conjugation between benzene rings play key roles. The results enhance our understanding of the surface interactions between Ag-HKUST-1 and NR dyes and broaden the application of HKUST-1 as an adsorbent for pollutant removal in water.