Novel all-solid-state Z-scheme SnO2/Pt/In2O3 photocatalyst with boosted photocatalytic performance on water splitting and 2,4-dichlorophenol degradation under visible light
Novel all-solid-state Z-scheme SnO2/Pt/In2O3 photocatalyst with boosted photocatalytic performance on water splitting and 2,4-dichlorophenol degradation under visible light
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新型全固态Z型SnO2/Pt/In2O3光催化剂，在可见光下提高水分解和2,4-二氯苯酚降解的光催化性能
DOI：
10.1016/j.cej.2020.124518
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发表时间：
2020-06
影响因子：
15.1
通讯作者：
Chi He
中科院分区：
文献类型：
--
作者：
Yukun Sun;Qi Zhu;Bo Bai;Yuliang Li;Chi He
构建Z型光催化体系对于水的分解和有机污染物的降解具有重要意义。然而，由于对能带边缘水平对准和界面接触的苛刻要求，选择合适的材料来形成Z方案的MEMS系统是非常具有挑战性的。本文采用原位沉积和光还原相结合的方法制备了一种新型的全固态Pt桥SnO 2/Pt/In 2 O3 Z光催化剂。用SEM、TEM、BET、DRS、PL、EIS等手段对材料的物化性能进行了表征。结果表明，由于Pt纳米粒子的局域表面等离子体共振效应，所制备的复合材料的可见光吸收能力显著增强。此外，这种Pt纳米粒子作为光生载流子的电子介体，可以有效地分离SnO 2/Pt/In 2 O3 Z型光催化剂的光生电子空穴对，从而保留最有利的还原和氧化反应位点。2，4-二氯苯酚的光催化降解效率（50 mg L-1）在可见光下SnO 2/Pt/In 2 O3上180 min内达到90%，最佳光催化产氢速率达到967.018 μmol h-1g-1，分别比纯In 2 O3（103.358 μmol h-1g-1）和SnO 2（49.847 μmol h-1g-1）高9.36和19.40倍。此外，稳定性实验表明，SnO 2/Pt/In 2 O3 Z体系光催化剂在5次循环后的H2生成速率仅下降了8.96%。该研究不仅为制备高活性、高稳定性的光催化剂提供了一种简便、环保的方法，而且为设计和构建新型Z型光催化材料提供了一种新的思路。
Fabricating Z-scheme photocatalytic system is of great significance for water splitting and degradation of organic pollutants. However, it is highly challenging to select suitable materials to form Z-scheme photocatalysis systems due to the harsh requirement for band edge levels alignment and interfacial contact. In this work, a novel all-solid-state Pt-bridge SnO2/Pt/In2O3Z-scheme photocatalyst was prepared by an ingeniousin situdeposition and photo-reduction protocol. The physicochemical properties of prepared materials were characterizedviaSEM, TEM, BET, DRS, PL, and EIS. It is revealed that the visible light absorption capacity of prepared composites was remarkably enhanced due to the localized surface plasma resonance effect of Pt nanoparticles. Moreover, such Pt nanoparticles act as the electron mediator of photogenerated carriers, and the photogenerated electron hole pairs of SnO2/Pt/In2O3Z-scheme photocatalysts can be effectively separated, which hence reserving the most favorable reductive and oxidative reaction sites. The photocatalytic degradation efficiency of 2,4-dichlorophenol (50 mg L−1) over SnO2/Pt/In2O3under visible light reaches 90% in 180 min, and the optimal photocatalytic H2generation rate reaches 967.018 μmol h−1g−1, respectively more than 9.36 and 19.40 times higher than that of pure In2O3(103.358 μmol h−1g−1) and SnO2(49.847 μmol h−1g−1). In addition, the stability experiments showed that the H2generation rate of the SnO2/Pt/In2O3Z-scheme photocatalyst after five cycles has only decreased by 8.96%. This work not only demonstrates a facile and eco-friendly strategy to prepare highly active and stable photocatalyst, but provides a new viewpoint about designing and constructing novel Z-scheme photocatalytic materials.
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