Enhanced photocatalytic activity of zinc oxide synthesized by calcination of zinc sulfide precursor
Enhanced photocatalytic activity of zinc oxide synthesized by calcination of zinc sulfide precursor
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DOI：
10.1016/j.mssp.2012.06.006
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发表时间：
2013-04
影响因子：
4.1
通讯作者：
Xiaohua Zhao;M. Li;Xiangdong Lou
中科院分区：
文献类型：
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作者：
Xiaohua Zhao;M. Li;Xiangdong Lou
采用ZnS前驱体在空气气氛中煅烧的方法合成了ZnO纳米粒子，其中首先以硫化钠(Na2S)为沉淀剂通过沉淀法合成了ZnS。通过X射线衍射、能量色散谱、扫描电子显微镜和透射电子显微镜对样品的详细结构和形貌进行了表征。通过紫外-可见吸收光谱检查光学性质。通过活性蓝 14 (KGL) 的降解来评估样品的光催化活性。结果表明，ZnS前驱体在400~800℃的温度范围内煅烧逐步转化为纯ZnO，并且在700℃以上可以得到纯ZnO。 700℃煅烧得到的ZnO平均晶粒尺寸约为45nm，表现出最高的光催化活性，在紫外线照射下60min后，KGL降解率接近97.1%，优于直接合成和商业化的ZnO。讨论了不同样品及其光催化活性之间的内在相关性。样品的物相、晶体尺寸、比表面积和氧空位缺陷被认为会影响其光催化活性。
ZnO nanoparticles were synthesized by calcination of ZnS precursor in an air atmosphere, in which ZnS had been firstly synthesized through precipitation with sodium sulfide (Na2S) as the precipitator. Detailed structure and morphology of the samples were characterized by X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, and transmission electronic microscopy. Optical properties were examined by UV–vis absorption spectroscopy. Photocatalytic activities of the samples were evaluated by degradation of Reactive Blue 14 (KGL). The results indicate that ZnS precursor converted into pure ZnO stepwise via calcination at a temperature range of 400–800°C, and pure ZnO can be achieved above 700°C. ZnO obtained by calcination at 700°C had an average crystalline size around 45nm and exhibited the highest photocatalytic activity, degrading KGL by almost 97.1% after 60min under ultraviolet irradiation, which was superior to that of the directly synthesized and commercial ZnO. The inherent correlation between different samples and their photocatalytic activities was discussed. The phase, crystalline size, specific surface area and oxygen vacancy defects of the samples were proposed to affect their photocatalytic activity.