Ren Yawei, Han Yajing, Li Zhaoyang, Liu Xiangmei, Zhu Shengli, Liang Yanqin, Yeung Kelvin Wai Kwok, Wu Shuilin
The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China, School of Materials Science & Engineering, Tianjin University, Tianjin, 300072, China.
Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan, 430062, China.
Bioact Mater. 2020 Feb 21;5(2):201-209. doi: 10.1016/j.bioactmat.2020.02.005. eCollection 2020 Jun.
Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol-gel method, which endowed TiO NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO. Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti-O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for and , respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO.
细菌感染及相关疾病正威胁着人类健康。光催化消毒作为一种简单且低成本的消毒策略，正受到越来越多的关注。在这项工作中，采用溶胶 - 凝胶法通过共掺杂铈（Ce）和铒（Er）对二氧化钛纳米颗粒（NPs）进行改性，与未处理的二氧化钛相比，改性后的二氧化钛纳米颗粒具有增强的可见光光催化性能，但不具备纯紫外光催化性能。我们的结果表明，随着铒掺杂量的增加，改性二氧化钛纳米颗粒的光催化活性先增加后降低。铈掺杂也出现同样的趋势。当铒和铈的掺杂剂量分别为0.5 mol%和0.2 mol%时，在800℃煅烧的0.5Ce0.2Ti - O表现出最佳的抗菌性能，对大肠杆菌和金黄色葡萄球菌的抗菌效率分别为91.23%和92.8%。铒离子的存在被认为成功地将近红外辐射转化为可见光区域，这更容易被二氧化钛纳米颗粒吸收。同时，铈离子的加入可以有效扩展光谱响应范围并抑制电子和空穴的复合，增强共掺杂二氧化钛的光催化消毒活性。
