Abstract
Enrichment of gold (Au) from wastewater is an efficient use of non-renewable resources and can reduce environmental pollution. Here, A new adsorbent (UiO-66-ES) is created that efficiently captures Au(III) in simulated wastewater by altering UiO-66-NH2 with poly(ethylene sulfide). The adsorbent was successfully prepared as confirmed by FT-IR, SEM, EDS, BET, XRD and XPS. At 318 K and a pH of 4.0, the highest removal ability of UiO-66-ES for gold ions is 723.005 mg/g. Kinetic studies revealed that Au(III) chemisorption on UiO-66-ES was the main driving force in the process. The recovery of Au(III) by UiO-66-ES happened as a monolayer adsorption over a uniform surface, according to the isotherm investigation. Meanwhile, thermodynamic analyses revealed that the adsorption is a heat-absorbing and natural phenomenon. Moreover, after four adsorption–desorption cycles, UiO-66-ES still achieved 89.83% adsorption and 86.43% desorption. In simulated wastewater comprising seven metallic ions, the adsorbent is extremely specific for Au(III). The adsorption mechanism of Au(III) includes electrostatic attraction, chelation, and reduction, according to zeta and XPS data. Since its high adsorption capacity, great selectivity, and good repeatability, UiO-66-ES is projected to be used in the practice of gold (Au) recovery from wastewater.
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