Department of Biology, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China.
Environ Sci Technol. 2009 Oct 15;43(20):7883-8. doi: 10.1021/es902013d.
Zn:In(OH)ySz solid solution nanoplates (Zn:In(OH)ySz-SSNs) with uniform nanoparticle size were synthesized through a simple sodium dodecyl sulfate (SDS)-assisted hydrothermal process. To achieve better photoabsorption in the visible light (VL) region and suitable redox potentials of the Zn:In(OH)ySz solid solution (Zn:In(OH)ySz-SS), the substitution of S(2-) for OH was carried out by adjusting the concentration of thiourea and SDS in the synthesis solution, while the doping of Zn2+ was realized by adjusting Zn2+ concentration. In addition, the morphology and crystallinity of Zn:In(OH)ySz-SSs were also controlled by the concentration of SDS. Using Rhodamine B (RhB) as a target pollutant the photocatalytic performance of these Zn:In(OH)ySz-SSs with different components, diameter sizes, and morphologies was investigated. Remarkably, Zn:In(OH)ySz-SSNs prepared with atomic ratio of Zn2+ and In3+ of 0.6, 45 mmol L(-1) thiourea, and 26 mmol L(-1) SDS, have the highest visible-light-driven (VLD) photocatalytic activity, exceeding 95% for the degradation of RhB after 60 min. The investigation of photocatalylic mechanism further indicates that the holes, superoxide radical (*O2(-)) and surficial hydroxyl radical (*OHs) are the major reactive species for the photocatalytic reactions. More importantly, for the first time, a simple and versatile strategy is developed to confirm the fact that direct contact between the Zn:In(OH)ySz-SS and RhB is the prerequisite for the photocatalytic degradation of RhB. Therefore, we report not only the preparation of a novel and effective VL-driven photocatalyst, but also provide mechanistic insight into semiconductor photocatalysis.
Zn:In(OH)ySz 固溶体纳米板（Zn:In(OH)ySz-SSNs）通过简单的十二烷基硫酸钠（SDS）辅助水热法合成，具有均匀的纳米颗粒尺寸。为了在可见光（VL）区域实现更好的光吸收和 Zn:In(OH)ySz 固溶体的合适氧化还原电位（Zn:In(OH)ySz-SS），通过调整合成溶液中硫脲和 SDS 的浓度来进行 S(2-) 取代 OH，同时通过调整 Zn2+浓度实现 Zn2+掺杂。此外，SDS 的浓度还控制着 Zn:In(OH)ySz-SSs 的形貌和结晶度。使用 Rhodamine B（RhB）作为目标污染物，研究了具有不同成分、直径大小和形貌的这些 Zn:In(OH)ySz-SSs 的光催化性能。值得注意的是，Zn2+和 In3+原子比为 0.6、45 mmol L(-1)硫脲和 26 mmol L(-1)SDS 制备的 Zn:In(OH)ySz-SSNs 具有最高的可见光驱动（VLD）光催化活性，在 60 min 内 RhB 的降解率超过 95%。光催化机理的研究进一步表明，空穴、超氧自由基（*O2(-)）和表面羟基自由基（*OHs）是光催化反应的主要活性物质。更重要的是，首次开发了一种简单通用的策略，证实了 Zn:In(OH)ySz-SS 与 RhB 直接接触是 RhB 光催化降解的前提。因此，我们不仅报道了一种新型高效 VL 驱动光催化剂的制备，而且为半导体光催化提供了机理见解。
