Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovative Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovative Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
J Hazard Mater. 2017 Jun 5;331:235-245. doi: 10.1016/j.jhazmat.2017.02.049. Epub 2017 Feb 27.
ZnO is an important semiconductor and has been widely used in the field of photocatalysis, solar cell and environmental remediation. Herein, we fabricated C-doped ZnO ball-in-ball hollow microspheres (BHMs) by a facile solvothermal treatment of zinc acetate in ethylene glycol-ethanol mixture. The presence of ethylene glycol (EG) leads to the formation of initial single-layered hollow spheres and then a time-dependent evolution transforms them into uniform BHMs with tunable shell thickness and void space. XPS characterizations reveal that C-dopants are introduced into the lattice of ZnO BHMs, with its concentration increasing with solvothermal time and then becoming saturated in 12h. ZEG-12 (ZnO BHMs with 12-h solvothermal treatment), with an optimal hollow structure and C-doping concentration, performs the best optical absorption capability, efficiency of charge separation and transfer, and mass transfer in reaction media, as proved by SEM, TEM, PL, BET and EIS characterizations. When applied as photocatalyst for organic-pollutant degradation and as photoanode material for PEC water splitting, ZEG-12 exhibits respectively ca. 8.9-fold and 10.5-fold higher activity than pristine ZnO nanoparticles.
氧化锌是一种重要的半导体，已广泛应用于光催化、太阳能电池和环境修复等领域。在此，我们通过在乙二醇-乙醇混合溶液中处理醋酸锌制备了 C 掺杂的氧化锌球中球空心微球（BHMs）。乙二醇（EG）的存在导致初始单层空心球的形成，然后随着时间的推移发生了一个依赖时间的演变，最终形成具有可调壳厚和空隙空间的均匀 BHMs。XPS 表征揭示了 C 掺杂剂被引入到 ZnO BHMs 的晶格中，其浓度随溶剂热时间的增加而增加，然后在 12 小时内达到饱和。具有最佳空心结构和 C 掺杂浓度的 ZEG-12 在 SEM、TEM、PL、BET 和 EIS 表征中表现出最好的光吸收能力、电荷分离和转移效率以及在反应介质中的传质能力。当用作有机污染物降解的光催化剂和 PEC 水分解的光电阳极材料时，ZEG-12 的活性分别比原始 ZnO 纳米粒子高约 8.9 倍和 10.5 倍。
