Mesoporous TiO2@Ag3PO4 photocatalyst with high adsorbility and enhanced photocatalytic activity under visible light
Mesoporous TiO2@Ag3PO4 photocatalyst with high adsorbility and enhanced photocatalytic activity under visible light
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介孔TiO2@Ag3PO4光催化剂具有高吸附性和增强可见光下的光催化活性
DOI：
10.1016/j.materresbull.2015.04.029
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发表时间：
2015-10-01
影响因子：
5.4
通讯作者：
Luo, Yan
中科院分区：
文献类型：
--
作者：
Yang, Lixia;Duan, Wuyan;Luo, Yan
将粒径为20 nm的介孔TiO 2附着在Ag 3 PO 4晶体（直径为200 nm ~ 400 nm）表面。这种特殊的介孔TiO 2壳层阻止了Ag 3 PO 4在溶液中的溶解，减少了Ag 3 PO 4晶体中生成的水银离子的数量，从而在不降低其可见光吸收的情况下保护了Ag 3 PO 4免受光腐蚀。TiO2@Ag3PO4催化剂具有很高的可见光催化活性，这是由于Ag 3 PO 4的窄带隙存在。与纯Ag 3 PO 4相比，由于TiO 2的介孔结构，TiO2@Ag3PO4对罗丹明B（RhB）的吸附量从1.1%提高到14.8%.当n（TiO 2）：n（Ag 3 PO 4）为0.5：1时，复合催化剂的降解效率最高。当催化剂用量为0.05g时，100 mL的10 mg/L罗丹明B溶液在12 min内可被完全降解。(C)2015爱思唯尔有限公司版权所有。
Mesoporous TiO2 with 20 nm particle size was attached onto the surface of Ag3PO4 crystals (200nm to 400 nm in diameter). The special mesoporous TiO2 shell hindered Ag3PO4 from being dissolved into the solution, which reduced the number of aqua-Ag ions generated from Ag3PO4 crystal, thereby protecting Ag3PO4 from photocorrosion without decreasing its visible-light absorption. TiO2@Ag3PO4 catalyst had high visible-light photocatalytic activity because of the presence of narrow-band-gap Ag3PO4. Compared with pure Ag3PO4, the adsorption capacity of TiO2@Ag3PO4 toward rhodamine B (RhB) increased from 1.1% to 14.8% because of the mesoporous structure of TiO2. The composite TiO2@Ag3PO4 catalyst with molar ratio 0.5:1 exhibited the highest degradation efficiency. About 100 mL of 10 mg/LRhB can be totally degraded within 12 min in presence of 0.05 g of catalyst. (C) 2015 Elsevier Ltd. All rights reserved.