In-situ reduction of Au(S2O3)23− for efficient recovery of gold with magnetically separable shell-core structured MoS2@Fe3O4 composite

Efficient Recovery of Gold(I) from Thiosulfate Solutions through Photocatalytic Reduction with Mn(II)-Doped MoS2

“…Adding HAuCl 4 into (NH 4 ) 2 S 2 O 3 solution was to prepare [Au­(S 2 O 3 ) 2 ] 3– solution as described in previous work; 10 mg of synthesized samples (MoS 2 or Mn-MoS 2 ) was added into [Au­(S 2 O 3 ) 2 ] 3– solution (150 mL) with a Au concentration of 100 mg/L, and subsequently, the solution was stirred (150 rpm) under natural light with an intensity of 0.457 kW/m 2 . The composition design of gold solution was based on the recovery ability of the synthesized materials.…”

“…21 What is more, MoS 2 could be reused from liquid through construction of threedimensional aerogels or combing with magnetic material such as Fe 3 O 4 . 22 From the perspective of catalysis using MoS 2 , the electronic conductivity of MoS 2 was unsatisfactory, 23−25 hinder further efficient recovery of [Au(S 2 O 3 ) 2 ] 3− . Doping with heteroatoms in MoS 2 had always been considered one of the most promising strategy to tune the electronic structure and then improve the photocatalytic reduction ability.…”

“…The reduction of [Au­(S 2 O 3 ) 2 ] 3– by MoS 2 mainly consisted of photoreduction and chemical reduction in which photoreduction played a dominant role . What is more, MoS 2 could be reused from liquid through construction of three-dimensional aerogels or combing with magnetic material such as Fe 3 O 4 …”

An Overview of Modified Chitosan Adsorbents for the Removal of Precious Metals Species from Aqueous Media

“…The Au(III) sorption properties of chemically modified chitosan were studied by Donia et al, where the primary interaction between modified chitosan polymers and Au(III) involves the formation of salt linkages between R-CH=NH + and AuCl 4-species [71]. In a report by Sun and Song, they indicated that the catalytic reduction of Au(S2O3)2 3-occurs on the surface sites of a MoS2@Fe3O4 composite [72]. These composites can produce photoelectrons in the conduction band that creates holes on the valence band to reduce adsorbed Au(S2O3)2 3-to Au(0) directly [72].…”

“…In a report by Sun and Song, they indicated that the catalytic reduction of Au(S2O3)2 3-occurs on the surface sites of a MoS2@Fe3O4 composite [72]. These composites can produce photoelectrons in the conduction band that creates holes on the valence band to reduce adsorbed Au(S2O3)2 3-to Au(0) directly [72]. Zhao used energy-dispersive X-ray spectroscopy (EDS) to determine that gold ions were adsorbed onto the surface of cystamine-modified magnetic cross-linked chitosan.…”