Construction of Magnetic S‐Doped CoWO₄ Composite for Efficient and Selective Recovery of Gold from Wastewater via Adsorption–Reduction Pathway

The design and synthesis of efficient adsorbents for the recovery precious metals from secondary resources are great environmental economic significance. Herein, a magnetic sulfur-doped composite CoFe2O4@S–CoWO4 ([email protected]–CoWO4) is developed through hydrothermal method, which used to selectively recover gold in aqueous media. Significantly, [email protected]–CoWO4 exhibits best overall performance with ions adsorption capacity (Qmax) distribution coefficient (Kd) 1049 mg g−1 4.4 × 106 mL g−1, respectively, much higher than those other materials. selectivity coefficients (K) toward metal (Pd2+, Ca2+, Mg2+, Cd2+, Al3+, Li+, Ni+) also higher, suggests that had preferential Au3+ coexisting ion solutions. Moreover, antianion interference follows order: SO42− > PO43− NO3− CO32−, it shows very good reusability efficiency at 81.78% after four repeated cycles. Based on characterizations calculation, found Au(III) mainly undergoes chelation reduction reactions S sites protected]–CoWO4, indicates important role sites. Hence demonstrates promising application recycling electronic wastewater.