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Selective recovery of Au(III) from wastewater by a recyclable magnetic Ni0.6Fe2.4O4 nanoparticels with mercaptothiadiazole: Interaction models and adsorption mechanisms
- Zhao, Jiling, Wang, Chen, Wang, Shixing, Zhang, Libo, Zhang, Bing
- Journal of cleaner production 2019 v.236 pp. 117605
- adsorbents, adsorption, desorption, endothermy, gold, industry, ion exchange, magnetism, metal ions, models, nanogold, pH, social benefit, sorption isotherms, temperature, thermodynamics, wastewater
- Gold is widely used in various industries. The recovery of Au(III) from wastewater has important economic and social benefits. In here, a new adsorbent (Ni0.6Fe2.4O4-MTD) was synthesized by functionalizing Ni0.6Fe2.4O4 with mercaptothiadiazole for selectively recovery of Au(III) from wastewater. The Ni0.6Fe2.4O4-MTD was characterized by FT-IR, TEM, ZETA, TGA and XPS. The optimum pH, kinetic, isotherm and thermodynamics were determined. The maximum adsorption capacity (283.9 mg/g) was obtained at pH 4 and 300 min. The mechanism was mainly ion exchange, complexation and reduction. The adsorption process submits to pseudo-secondary kinetics and Langmuir models because monolayer chemisorption is the rate-determining step. Adsorption and desorption experiments had shown that the adsorbent was reusable at least 4 cycles. In addition, Ni0.6Fe2.4O4-MTD can selectively separate Au(III) from laboratory wastewater containing various metal ions. The increase of temperature is favorable for Au(III) adsorption because adsorption processes were a spontaneous endothermic reaction. Since Ni0.6Fe2.4O4-MTD has high adsorption capacity and remarkable selectivity for Au(III), it becomes an ideal adsorbent for the recovery of Au(III) in wastewater.