Efficient adsorption of Au(III) from acidic solution by a novel N, S-containing metal-organic framework

Due to the special status of precious metals in the preparation of high-tech materials, the recycling of precious metals has important practical significance. A novel metal-organic framework called as Zn-AMT containing large number of functional atoms (N, S) was prepared as a highly efficient adsorbent to recover Au(III) from acid solution. Compared with the reported adsorbents, Zn-AMT shows remarkable adsorption efficiency towards Au (III) with the maximum adsorption capacity up to 2040 mg.g(-1) at 25 ?. Increasing temperature to 42 C could make the adsorption capacity increased to 2878 mg.g(-1). The adsorption ratio of 100% could be achieved for the low Au(III) concentration within 100 mg.L-1. The Zn-AMT shows both excellent selectivity and good reusability. The adsorption kinetics data follow the pseudo-second-order kinetics and the adsorption isotherms data are well fitted by the Langmuir model. The adsorption mechanism was deduced that the Au(III) was firstly adsorbed onto the surface of Zn-AMT through electronic attraction and the coordination interaction of-SH, and then in situ reduced to Au(I). With the prominent adsorption performance, excellent selectivity, and admirable reusability, the Zn-AMT adsorbent could be a promising candidate for gold recovery in practical application.

Automated summary

This study reports a novel metal-organic framework material, Zn-AMT, which can be used as a highly efficient adsorbent for recovering Au(III) from acid solution. The adsorbent exhibits remarkable adsorption efficiency, excellent selectivity, and good reusability, making it a promising candidate for gold recovery in practical applications.