| 桑换新,葛永慧,刘兴静,王振力.化学通报,2018,81(4):349-354. |
| 硫比例对Zn0.8Cd0.2S-En杂化固溶体光催化制氢性能的影响 |
| Effects of molar ratio of S on the photocatalytic hydrogen production over Zn0.8Cd0.2S-En hybrid solid solutions |
| 投稿时间：2017-11-23 修订日期：2018-01-28 |
| DOI： |
| 中文关键词: 光催化 制氢 Zn0.8Cd0.2S固溶体 杂化纳米片 乙二胺 |
| 英文关键词:photocatalyst, hydrogen production, Zn0.8Cd0.2S-En hybrid solid solutions, nanosheet,Ethylenediamine |
| 基金项目:国家自然科学基金资助(20806059) |
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| 摘要点击次数: 1922 |
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| 中文摘要: |
| 采用溶剂热制备了具有不同厚度和大小的Zn0.8Cd0.2S-乙二胺杂化纳米片固溶体，系统地考察了制备过程中S/(Zn+Cd)摩尔比对所制备的光催化材料的组成与结构、光电性质以及亲水性能的影响。HR-TEM照片表明，随着制备体系中硫脲含量的增加，固溶体纳米片表面逐渐平整；荧光发射光谱结果表明，合适的S/(Zn+ Cd)摩尔比可以提高光催化材料光生电子和空穴的分离效率；光催化性能评价表明，制备过程中的S/(Zn+ Cd)原子比对其制氢活性有明显影响，在可见光照射下，S/(Zn+Cd)为4.75时，合成的Zn0.8Cd0.2S-En样品表现出最高的氢气产率，其可达到12100 μmol·h-1·g-1，分别是S/(Zn+Cd)为1.2和6.5时合成的Zn0.8Cd0.2S-En样品产氢量的2.2倍和1.7倍。光催化活性的提高与样品较少的表面缺陷、合适的形貌以及高光生电子和空穴分离效率有关。 |
| 英文摘要: |
| Zn0.8Cd0.2S-En hybrid solid solutions with different thickness and size were successfully synthesized by changing the atomic ratio of S/(Zn+Cd) in the hydrothermal reaction. The results show that the content of thiourea in solvent has an important effect on the composition and structure, photoelectric property and hydrophilic property of the prepared solid solutions. With the increase of the content of thiourea in the reaction system, the nanosheet solid solutions were gradually formed. Fluorescence emission spectra (photoluminescence spectra) and photocatalytic activity tests show that the proper S/(Zn+Cd) atomic ratio can improve the separation efficiency of photogenerated electrons and holes, resulting into the superior photocatalytic activity. The maximum yield of Zn0.8Cd0.2S-En under visible light irradiation was obtained when the molar ratio of S/(Zn+Cd) was 4.75, reaching 12100 μmol · h-1 · g-1, which is 2.19 times and 1.7 times higher than those over samples with S/(Zn+Cd) of 1.2 and 6.5. The improvement of photocatalytic activity is mainly related to the less surface defects, suitable morphology, and high separation efficiency of photo-generated electrons and holes. |
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