Abstract Co doped SnO2 nanoparticles were synthesized by chemical precipitation. Excess Co ions as doping element were used to compensate the deficit of oxygen from SnO2 lattice. The crystalline structure of all samples corresponds to tetragonal rutile crystalline phases of tin oxide and the crystallinity increases by doping. The nanoparticles shape is polyhedral with narrow distribution. The presence of Co ions in SnO2 lattice results in decreasing the oxygen deficiency. All the doped samples show the red shift in optical response. Photoluminescence emission spectra show peaks in UV and visible region. Visible emissions decrease by doping which indicate lower recombination rate of photogenerated electron-hole pairs. All the samples show photocatalytic activity against RhB synthetic solution under visible light irradiation, the best performance was obtained using 1.0%Co–SnO2. The mechanism of photocatalytic activity was explained based on the reactive oxygen species generated by nanoparticles under visible irradiation in correlation with structural and optical information obtained in this study.

中文翻译：

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通过控制氧空位状态增强 Co 掺杂的 SnO2 纳米粒子的光催化活性

摘要 采用化学沉淀法合成了Co掺杂的SnO2纳米颗粒。过量的 Co 离子作为掺杂元素用于补偿 SnO2 晶格中氧的不足。所有样品的晶体结构对应于氧化锡的四方金红石晶相，并且结晶度通过掺杂增加。纳米颗粒形状为多面体，分布较窄。Co 离子在 SnO2 晶格中的存在导致氧不足的减少。所有掺杂的样品都显示出光响应的红移。光致发光发射光谱在紫外和可见光区域显示出峰值。掺杂减少了可见光发射，这表明光生电子-空穴对的复合率较低。所有样品在可见光照射下均表现出对 RhB 合成溶液的光催化活性，使用 1.0% Co-SnO2 获得最佳性能。基于纳米粒子在可见光照射下产生的活性氧与本研究中获得的结构和光学信息相关联，解释了光催化活性的机制。