The second recovery of gold has fundamental environmental and economic significance.

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In this paper, the covalent organic polymer of enaminone was modified by thiourea, and the covalent organic polymer of thiourea (CTOP) was synthesized by simple solvothermal method. At 25 ℃, the adsorption capacity of the polymer for trivalent gold ion is 2372.7 mg/g. In the mixed aqueous solution of divalent cadmium ion, trivalent gold ion, divalent copper ion, divalent cobalt ion and divalent nickel ion, CTOP can only adsorb trivalent gold ion, which indicates that CTOP has high selective adsorption performance for trivalent gold ion. In addition, CTOP material still maintains high adsorption performance after five adsorption cycles, which proves that the adsorption material has good reusability. According to the experimental results of adsorption kinetics and thermodynamics, the adsorption process of CTOP for trivalent gold ions conforms to the quasi second order adsorption model and Langmuir adsorption model, that is, the adsorption process of CTOP for trivalent gold ions is single-layer chemical adsorption. CTOP not only has strong adsorption and selectivity to Au (Ⅲ), but also has good reusability. Therefore, it is an ideal environmental functional material, which can be used to separate and enrich trivalent gold ions in wastewater.

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