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首页> 外文期刊>Catalysis science & technology >Study of the enhanced visible-light-sensitive photocatalytic activity of Cr2O3-loaded titanate nanosheets for Cr(VI) degradation and H-2 generation
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Study of the enhanced visible-light-sensitive photocatalytic activity of Cr2O3-loaded titanate nanosheets for Cr(VI) degradation and H-2 generation

机译：研究增强visible-light-sensitive光催化活性Cr2O3-loaded钛酸nanosheets铬(VI)退化和2一代

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摘要

Visible-light-sensitive titanate nanosheets (TNSs) were synthesized with Cr2O3 successfully loaded and well dispersed on Cr(III)-TNSs by a one-step hydrothermal method for enhanced photocatalytic activity. As in our previous reports, the as-prepared samples clearly exhibited a porous flake-like structure with a large specific surface area (300-400 m(2) g(-1)). Accompanied with the hydrothermal growth of the TNSs, the loaded Cr2O3 not only influenced the layered structure of the TNSs, but also brought about a remarkable enhancement of the visible-light response and the separation of photogenerated carriers. The XPS fitting results indicated that the Cr ions mainly existed in the trivalent form and caused a change in the binding states towards Ti and O. Based on the evaluation of the photocatalytic activity, it was found that the Cr(III)TNSs obtained a significant improvement for RhB and K2Cr2O7 (Cr(VI)) degradation under visible-light irradiation, which was attributed to retarding the charge recombination and the effective electron transfer from Cr2O3 to TNSs. The better photocatalytic activity was obtained with an optimal content (0.5 at%) of Cr3+, and the degradation rate (K-app) was 2.9-fold and 4.1-fold, respectively, as compared to TNSs. The samples were also evaluated in photocatalytic H-2 generation with the photodeposition of Pt nanoparticles as cocatalysts. The results showed that the visible-light H-2 production rate of Pt-0.25/Cr(III)-TNSs (0.25 wt% of Pt) was observably enhanced under the efficient sacrificial agent/water system, giving a relatively high H-2 generation rate of 473 mu mol h(-1) g-1 at 0.5 at% of Cr3+ content. The cyclic tests demonstrated the good stability and recycling performance of the samples. Alternative mechanisms for the visible-light-sensitive photocatalytic activity were also proposed.
机译：钛酸Visible-light-sensitive nanosheets评分)合成了Cr2O3成功加载和分散在铬(III)评分的一步增强光催化水热方法活动。好样品明显表现出一种多孔片状的结构与具体面积(300 - 400 m (2) g(1))。热液评分的增长,加载Cr2O3不仅影响了分层结构的评分,但也带来了可见光的显著增强反应和photogenerated的分离运营商。三价的铬离子主要存在形式并造成的改变对绑定状态Ti和o .评价的基础上光催化活性,这是发现铬(III)从而获得明显改善重铬酸钾RhB和铬(VI)下退化可见光照射,这是由于负责重组和减速有效的电子转移Cr2O3评分。更好的光催化活性与最优的三价铬,的内容(%)0.5降解率(K-app)是2.9倍分别为4.1倍,而评分。样本还在光催化2评估代的photodeposition Pt:纳米颗粒。的可见光,氢产量Pt - 0.25 /铬(III)评分(0.25 wt %的Pt)显著地提高了效率牺牲剂/水系统,给一个相对较高的2代473亩摩尔h(1)在三价铬含量的% g - 1为0.5级。展示了良好的稳定性和测试回收样品的性能。机制visible-light-sensitive提出了光催化活动。

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