曙红-碳纳米管-NiO光催化体系的构建及光催化还原水制氢性能

构建了曙红-碳纳米管-NiO(Eosin Y-MWNTs-NiO)光催化体系, 利用氢气还原法对其进行了活化, 然后使用三乙醇胺作为牺牲剂考察了其可见光催化还原水制氢性能. 研究结果表明, 氢气活化后的Eosin Y-MWNTs-NiO是一个高效的可见光催化剂. 其光催化还原水析氢的速率可达344 μmol·g-1·h-1. 其中, 氢气活化对催化剂的活性具有重要影响, 未活化的Eosin Y-MWNTs-NiO光催化体系的活性仅为活化后的光催化体系的1/10. 此外, 还研究了溶液pH值和催化剂用量对催化体系活性的影响. 在此基础上, 对Eosin Y-MWNTs-NiO的光催化机制进行了初步探讨.

Fabrication of the Eosin Y-MWNTs-NiO Photocatalytic System and Its Photocatalytic Activity for H2 Evolution from Water

A photocatalytic system containing Eosin Y,multiwalled carbon nanotubes(MWNTs) and NiO(Eosin Y-MWNTs-NiO) was fabricated and activated by hydrogen reduction treatment.The photocatalytic hydrogen evolution over this photocatalytic system was investigated using triethanolamine as a sacrificial reagent.The results displayed that the Eosin Y-MWNTs-NiO was an efficient photocatalyst with the highest rate of H2 evolution of 344 μmol·g-1·h-1 under visible light irradiation.Therein,the hydrogen reduction treatment played an important role in the improvement of photocatalytic activity.The activity of the photocatalytic system Eosin Y-MWNTs-6%NiO unactivated by hydrogen was only one-tenth of that of the activated one.Moreover,the photocatalytic hydrogen evolution was studied as functions of pH of the solution and dosage of the catalyst,respectively.Based on the results obtained,the mechanism was discussed preliminarily.