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Preparation of Y2SiO5:Pr3+,Li and Na2NbxTa2−xO6/(Au/RGO) composites and investigation into visible-light driven photocatalytic hydrogen production
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-06-06 00:00:00 , DOI: 10.1039/c8nj01768a
Xudong Liu 1, 2, 3, 4 , Xu Zhang 1, 2, 3, 4 , Cheng Zhao 1, 2, 3, 4 , Xiaoqing Shu 1, 2, 3, 4 , Dawei Fang 1, 2, 3, 4 , Jun Wang 1, 2, 3, 4 , Youtao Song 2, 3, 4, 5
Affiliation  

A visible-light-driven photocatalytic hydrogen production system (Y2SiO5:Pr3+,Li/Na2NbxTa2−xO6/(Au/RGO)), which is composed of an up-conversion luminescence agent (Y2SiO5:Pr3+,Li), Nb(V)-substituted Na2Ta2O6 (Na2NbxTa2−xO6) and a combined co-catalyst (Au/RGO), is designed and the photocatalytic hydrogen production activity is studied using methanol as the sacrificial agent in aqueous solution. In the employed composite nanoparticles, the Y2SiO5:Pr3+,Li/Na2Nb0.5Ta1.5O6/(Au/RGO) system with 0.4 : 1.0 mass ratio of Y2SiO5:Pr3+,Li and Na2Nb0.5Ta1.5O6 affords the highest amount of hydrogen production under visible-light irradiation, which is 2.3 times higher than that of Na2Nb0.5Ta1.5O6/(Au/RGO). The high photocatalytic hydrogen production activity is attributed to the spectrographic matching between Y2SiO5:Pr3+,Li and Na2Nb0.5Ta1.5O6/(Au/RGO). That is, the ultraviolet-light (230–320 nm) from the up-conversion emission of Y2SiO5:Pr3+,Li can effectively activate Na2Nb0.5Ta1.5O6/(Au/RGO). The presence of Nb can lead to the adjustment of the band-gap of Na2Ta2O6 to broaden the light response range. In addition, Au/RGO can quickly separate the photo-generated electrons and holes and further enhance the photocatalytic hydrogen production activity.

中文翻译:

Y 2 SiO 5:Pr 3+,Li和Na 2 Nb x Ta 2− x O 6 /(Au / RGO)复合材料的制备及可见光驱动的光催化制氢研究

可见光驱动的光催化制氢系统(Y 2 SiO 5:Pr 3+,Li / Na 2 Nb x Ta 2− x O 6 /(Au / RGO)),由上转换发光剂组成(Y 2 SiO 5:Pr 3+,Li),Nb(V)-取代的Na 2 Ta 2 O 6(Na 2 Nb x Ta 2− x O 6)和组合助催化剂(Au / RGO),设计并使用甲醇作为水溶液中的牺牲剂研究了光催化制氢活性。在所采用的复合纳米颗粒,在Y 2的SiO 5:PR 3+,锂/钠2的Nb 0.5的Ta 1.5 ø 6 /(金/ RGO)系统用0.4:Y为1.0质量比2的SiO 5 PR:3+,李Na 2 Nb 0.5 Ta 1.5 O 6在可见光照射下产生的氢量最高,是Na 2的2.3倍Nb 0.5 Ta 1.5 O 6 /(Au / RGO)。高的光催化制氢活性归因于Y 2 SiO 5:Pr 3+,Li和Na 2 Nb 0.5 Ta 1.5 O 6 /(Au / RGO)之间的光谱匹配。也就是说,Y 2 SiO 5:Pr 3+,Li的上转换发射产生的紫外光(230-320 nm)可以有效地激活Na 2 Nb 0.5 Ta 1.5 O 6 /(Au / RGO)。Nb的存在可导致Na 2带隙的调节Ta 2 O 6扩大了光响应范围。此外,Au / RGO可以快速分离光生电子和空穴,并进一步提高光催化制氢活性。
更新日期:2018-06-06
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