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| 离子液体辅助制备AgCl/Ag2O复合光催化剂 |
| Ionic liquid-assisted preparation of AgCl/Ag2O composite photocatalyst |
| 投稿时间：2022-05-04 |
| DOI： |
| 中文关键词: 光催化 AgCl/Ag2O 异质结 光生电荷分离 |
| 英文关键词: photocatalysis AgCl/Ag2O heterostructures charge separation |
| 基金项目:国家自然科学基金项目(22064005)；钒钛资源综合利用四川省重点实验室项目(2018FTSZ15) |
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| 中文摘要: |
| 在离子液体[CPMIm]Cl辅助下，采用沉淀法原位制备了AgCl/Ag2O复合光催化剂。采用X射线衍射仪(XRD)、能量散射光电子能谱(EDS)、扫描电镜(SEM)、比表面仪(BET)和紫外-可见漫反射光谱(UV-Vis DRS)等对AgCl/Ag2O复合光催化剂结构、组成、形貌、比表面积和光吸收性能进行了表征；运用表面光电压谱(SPS)对异质结光催化剂的光生电荷分离特性进行了研究。考察了AgCl/Ag2O复合光催化剂对模拟污染物甲基橙的光催化降解性能。结果表明，AgCl的存在抑制了Ag2O颗粒的生长，增加了复合光催化剂的比表面积和孔容积。AgCl与Ag2O的原位复合有效提高了复合光催化剂光生e-/h+对分离速率，增强了复合光催化剂对甲基橙的光催化降解。捕获测试表明?O2-是光催化降解甲基橙的主要活性自由基。 |
| 英文摘要: |
| AgCl/Ag2O composite photocatalysts were in-situ fabricated with the assistance of ionic liquid [CPMIm]Cl, and then were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), UV/Vis diffuse reflectance spectroscopy (UV-Vis DRS). Surface photovoltage spectrometer (SPS) was used to study the separation of photoinduced carriers. Using methyl orange as the model pollutant, the photocatalytic activities of AgCl/Ag2O heterostructures were investigated under simulated sunlight irradiation. The results indicate that the presence of AgCl in the composites significantly inhibited the growth of Ag2O particles, providing high specific surface area and large pore volume for the photocatalytic reaction. The separation rate of photoinduced e-/h+ pairs was effectively boosted by coupling AgCl with Ag2O, accelerating the formation of ?O2- and promoting the degradation of methyl orange. ?O2- is the main active free radicals during the photocatalytic degradation process of methyl orange. |
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