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Preparation of High-Performance CdS@C Catalyst Using Cd-Enriched Biochar Recycled From Plating Wastewater
Rui-Zhi Xing1, Jia-Xin Li1, Xing-Gui Yang1
1Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.
Frontiers in Chemistry
|April 8, 2020
Summary
This study transforms cadmium-enriched biochar from wastewater treatment into a CdS@C photocatalyst. This novel material efficiently degrades organic dyes, offering a sustainable solution for cadmium waste.
Area of Science:
- Materials Science
- Environmental Chemistry
- Photocatalysis
Background:
- Biochar effectively adsorbs cadmium (Cd) from wastewater but poses secondary pollution risks.
- Cadmium-enriched biochar requires safe disposal and valorization strategies.
Purpose of the Study:
- To develop a CdS@C photocatalyst from cadmium-enriched biochar.
- To evaluate the photocatalytic performance of CdS@C for organic dye degradation.
Main Methods:
- Rice straw biochar was used to adsorb Cd from plating wastewater.
- Cd-enriched biochar was pyrolyzed and hydrothermally treated to form mesoporous carbon-supported CdS (CdS@C).
- Photocatalytic degradation of organic dyes under visible light was assessed.
Main Results:
- Cd-enriched biochar exhibited a saturated adsorption capacity of 63.5 mg/g.
- The synthesized CdS@C photocatalyst contained mixed cubic and hexagonal CdS phases with a reduced band gap (2.1 eV).
- CdS@C demonstrated enhanced photocatalytic activity for dye degradation compared to pure CdS, attributed to improved light harvesting and electron-hole separation.
Conclusions:
- This research offers a method for safe disposal of Cd-enriched wastewater by creating a value-added CdS@C photocatalyst.
- The developed CdS@C material shows significant potential for environmental remediation applications.
