| Cu2O-Ag-AgBr/MA可见光催化剂的制备及其降解2-氯苯酚的研究 |
| 摘要点击 2686 全文点击 1186 投稿时间：2014-02-09 修订日期：2014-03-28 |
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| 中文关键词 Cu2O 可见光催化剂 等离子体 2-CP 活性物种 |
| 英文关键词 Cu2O visible-induced photocatalyst plasmon 2-CP active species |
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| 中文摘要 |
| 通过沉积-沉淀法 将Cu2O、Ag-AgBr负载在介孔 γ-Al2O3（MA）上制备了等离子体诱导可见光催化剂 Cu2O-Ag-AgBr/MA. 研究了其在可见光照（λ >420 nm）下的催化性能. 通过XRD、XPS和UV-vis吸收光谱的去卷积分析表明，表面银以Ag+和Ag0形式共存. 结果表明，Cu2O-Ag-AgBr/MA对难降解有机物2-氯苯酚（2-CP）显示出很高的可见光催化去除效率. 同时 Cu2O的掺入，显著抑制了降解过程中Ag+的溶出. 自由基捕获剂的影响实验表明，h+、O2·-和 ·OH是反应中最重要的活性物种. |
| 英文摘要 |
| Cu2O-Ag-AgBr/MA plasmon photocatalyst was prepared by the co-deposition of Cu2O and Ag-AgBr nanoparticles on mesoporous alumina (MA). The samples were characterized by means of X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS) and diffuse reflectance UV-vis spectra (UV-vis DRS). The results showed that both Ag+ and Ag0 existed on the surface. The photocatalytic activity of the samples prepared were evaluated by degradation of 2-chlorophenol (2-CP) under visible light (λ >420 nm) irradiation. The results showed that the catalyst had high photocatalytic activity for the degradation of 2-CP. Meanwhile, the doping of Cu2O nanoparticles significantly inhibited the release of silver ions during the photocatalytic reaction, which improved the photostability of the catalyst. Analyses on the effects of various scavengers showed that h+, O2·- and ·OH radicals were the primary active species. |
