Selective recovery of Au(III) from wastewater by a recyclable magnetic Ni0.6Fe2.4O4 nanoparticels with mercaptothiadiazole: Interaction models and adsorption mechanisms. (1st November 2019)

• Record Type: Journal Article
• Authors: Zhao, Jiling; Wang, Chen; Wang, Shixing; Zhang, Libo; Zhang, Bing
• Is Part Of: Journal of cleaner production. Volume 236(2019)
• Publication Date: 2019-11-01
• Subjects: Magnetic -- Adsorption -- Gold -- Wastewater -- Desorption; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.117605
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: 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 (Ni0.6 Fe2.4 O4 -MTD) was synthesized by functionalizing Ni0.6 Fe2.4 O4 with mercaptothiadiazole for selectively recovery of Au(III) from wastewater. The Ni0.6 Fe2.4 O4 -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, Ni0.6 Fe2.4 O4 -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 Ni0.6 Fe2.4 O4 -MTD has high adsorption capacity and remarkable selectivity for Au(III), it becomes an ideal adsorbent for the recovery of Au(III) in wastewater. Graphical abstract: Image 1 Highlights: A adsorbent was synthesized by functionalizing Ni0.6 Fe2.4 O4 with mercaptothiadiazole. The maximum adsorption capacity of adsorbent for Au(III) is 283.9 mg/g. Adsorbent shows good reusability after at least 4 cycles. Adsorbent can selectively separate Au(III) from wastewater with various metal ions.