Hollow 3D rGO/P-HC/TiO2 for Photocatalytic Degradation of Ammonia Nitrogen
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摘要: 采用水热法制备了一系列能够降解水体中氨氮的催化剂,通过SEM、XRD、BET和UV-vis-DRS光谱技术对催化剂材料的表面性质进行了表征,研究了HC、P-HC、rGO/P-HC、TiO2、P-HC/TiO2、rGO/TiO2和rGO/P-HC/TiO2的光催化性能,探讨催化剂用量、溶液p H值和氨氮浓度对氨氮降解过程的影响。研究发现,氨氮去除率随着催化剂用量的增加先升高后降低,在p H=8时氨氮去除率最高。rGO/P-HC/TiO2催化剂对氨氮降解的光催化活性明显高于其他催化剂,氨氮去除率达到93.0%,在循环利用试验中,rGO/P-HC/TiO2在紫外线和阳光下氨氮氧化反应中表现出良好的循环活性和稳定性。所制备的催化剂具有良好的应用前景。Abstract: In this work,a series of catalyst were successfully fabricated via hydrothermal method,which were used as efficient UV light photocatalytic degradation of ammonia nitrogen from aqueous solution.The surface properties of the catalysts were characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),the Brunauer-Emmett-Teller(BET) method and UV-vis-DRS spectroscopy(DRS) technique.The comparison of photocatalytic performance among HC,P-HC,rGO/P-HC,TiO2,P-HC/TiO2,rGO/TiO2 and rGO/P-HC/TiO2 was carried out.The influences of the dosage of catalyst,the solution p H and ammonia nitrogen concentration on the degradation process were also investigated.It is shown that the ammonia nitrogen removal rate first increases and then decreases with the increase of catalyst dosage.And the removal rate reaches the highest at p H = 8. The as-prepared rGO/P-HC/TiO2 catalyst shows a much higher photocatalytic activity for degradation of ammonia nitrogen than other catalysts,with the removal efficiency reached 93.0%.In cycle availability experiments,the rGO/P-HC/TiO2 exhibits outstanding recycle activity and stability in ammonia nitrogen oxidation reaction under UV and sun light.The prepared catalysts are promising for the degradation of ammonia nitrogen from water resource.
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Key words:
- TiO2 /
- rGO /
- photocatalytic /
- adsorption /
- ammonia nitrogen
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