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A MXene-based multiple catalyst for highly efficient photocatalytic removal of nitrate
Wanying Chen1, Bo Wu2, Qingzhao Yao3
1School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing, 211189, People's Republic of China.
This study developed an efficient photocatalyst for nitrate removal from wastewater using titanium dioxide (TiO2) grown on MXene and modified with silver. The novel material achieves high nitrate removal rates and nitrogen selectivity, offering a promising environmental solution.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Nitrate contamination in wastewater poses environmental risks.
- Efficient and selective photocatalytic nitrate removal remains a significant challenge.
- Developing advanced materials for wastewater treatment is crucial.
Purpose of the Study:
- To synthesize a novel photocatalyst for enhanced nitrate removal from wastewater.
- To investigate the synergistic effects of Ti3C2 MXene and silver nanoparticles on TiO2.
- To evaluate the efficiency, selectivity, and stability of the prepared photocatalyst.
Main Methods:
- In situ growth of TiO2 on Ti3C2 MXene via calcination.
- Modification of the composite material with silver particles.
- Photocatalytic degradation experiments under a high-pressure mercury lamp.
- Density functional theory (DFT) calculations to elucidate electron transfer pathways.
Main Results:
- The synthesized TiO2/Ti3C2 MXene/Ag photocatalyst exhibited excellent nitrate removal efficiency (96.1%) at 500 mgN/L.
- High nitrogen selectivity (92.6%) was achieved, minimizing unwanted byproducts.
- The photocatalyst demonstrated remarkable stability, retaining 89% efficiency after 5 cycles.
- DFT calculations confirmed the improved electron transfer and reduced recombination rates.
Conclusions:
- The novel TiO2/Ti3C2 MXene/Ag composite is a highly efficient and stable photocatalyst for nitrate removal.
- The synergistic effects of MXene and silver significantly enhance photocatalytic performance.
- This material presents a promising solution for wastewater remediation and environmental protection.
