Work

Selective electrosorption of silver ions from wastewater by biomass-derived N, S co-doped hierarchical porous carbon

Year: 2024

Type: article

Abstract: The recovery of precious silver (Ag) from wastewater, a dual pursuit of environmental sustainability and economic benefits, faces a formidable challenge in the selective extraction of Ag⁺ ions amidst a matrix of other metal ions. To address this, we developed a novel N, S co-doped hierarchical porous carbon (NSPC) derived from a renewable precursor of Camellia oleifera shell. As the electrode material for capacitive deionization (CDI), the optimized NSPC exhibited a high electroadsorption capacity of 480.5 mg g-1 for Ag+ ions under an operating voltage of 1.2 V. Owing to the strong reaction between Ag+ and S functional groups and the synergistic effect from a hierarchical porous structure and N doping, facilitates the formation of Ag₂S and elemental Ag, enabling the NSPC electrode to selectively remove nearly 100% of Ag⁺ ions from saline water and a solution containing Ni²⁺, Co²⁺, Pb²⁺, Zn²⁺, and Fe³⁺ ions. The impressive results show that the biomass-derived NSPC has the potential for rapid and selective recovery of silver from wastewater and offer a solution for environmental remediation and metal resource recovery.

Source: Separation and Purification Technology

DOI: 10.1016/j.seppur.2024.129944

Authors: Hongying Quan, Lanchao Kou, Zhi-Xia Zhang, Ning Wang, Dezhi Chen

Institution: Nanchang Hangkong University

Language: English

Topic: Membrane-based Ion Separation Techniques

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $3,790