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NiSe2/CdS composite nanoflakes photocatalyst with enhanced activity under visible light
Shijie Shen1,2,3, Linghui Yan3, Kai Song3
1School of Materials Science and Engineering, Lanzhou University of Technology Lanzhou 730050 China.
RSC Advances
|May 6, 2022
Summary
This study enhances organic pollutant degradation using a novel cadmium sulfide (CdS) and nickel selenide (NiSe2) composite photocatalyst. The NiSe2-CdS composite significantly boosts Rhodamine B degradation efficiency under visible light.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Environmental pollution from organic compounds necessitates advanced remediation strategies.
- Photocatalysis under visible light offers a sustainable solution for degrading persistent organic pollutants.
- Developing efficient and stable photocatalysts is crucial for practical environmental applications.
Purpose of the Study:
- To synthesize and characterize a novel composite photocatalyst for enhanced degradation of organic pollutants.
- To investigate the effect of nickel selenide (NiSe2) loading on cadmium sulfide (CdS) photocatalytic activity.
- To evaluate the stability and efficiency of the developed photocatalyst under visible light irradiation.
Main Methods:
- Solvothermal synthesis method for preparing NiSe2 nanoflakes loaded on CdS.
- Characterization using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).
- Evaluation of photocatalytic activity via degradation of Rhodamine B (RhB) under visible light, supported by electrochemical impedance spectroscopy (EIS) and photocurrent measurements.
Main Results:
- A 2 mol% loading of NiSe2 on CdS significantly enhanced the degradation rate of Rhodamine B by over twofold (0.01000 min⁻¹ compared to 0.00478 min⁻¹).
- The NiSe2-CdS composite exhibited excellent stability during the photocatalytic process.
- Enhanced performance is attributed to improved separation and transfer of photogenerated charge carriers due to the face-to-face contact between NiSe2 nanoflakes and CdS.
Conclusions:
- The developed NiSe2-CdS composite is a highly efficient and stable photocatalyst for degrading organic pollutants under visible light.
- The study demonstrates the potential of NiSe2 as an effective co-catalyst for optimizing photocatalytic materials.
- This research provides a promising approach for developing advanced materials for environmental remediation.
