Affiliation:
1. Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, School of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
2. Kunming Institute for Food and Drug Control, Kunming 650034, China
Abstract
The recovery of Au(III) from solution using adsorbents in the form of granules or powders is challenging due to issues such as instability during the recovery process or mass loss caused by small particle size. This study introduces a PEI-TCT/PVDF composite membrane designed to intercept and capture Au(III) in wastewater. Experimental results demonstrated that the PEI-TCT/PVDF membrane exhibits a broad pH range (1–8) and a high retention efficiency for Au(III) of 97.8%, with a maximum adsorption capacity of 294.5 mg/g. The mechanism of Au(III) adsorption on the PEI-TCT/PVDF membrane was mainly through electrostatic adsorption, which caused AuCl4− to aggregate on the surface of the membrane and gradually reduced to Au0 and Au+. Furthermore, the membrane can be entirely regenerated within 20 min and maintains its performance in subsequent adsorption cycles. This study highlights the potential of PEI-TCT/PVDF membranes for the recovery of precious Au(III).
Funder
Special Basic Cooperative Research Programs of Yunnan Provincial Undergraduate Universities’ Association
Basic Research Project of Yunnan Province
High-Level Talent Plans for Young Top-notch Talents of Yunnan Province
High-Level Talent Special Support Plans for Young Talents of Kunming City
Joint Basic Research Program (partial) of Yunnan Provincial Undergraduate Universities
Scientific and Technological Project of Yunnan Precious Metals Laboratory
Yunnan Fundamental Research Projects