Hao Xiufang, Cui Xiaoyan, Hu Meiqi, Jia Yiming, Li Xinxin, Wei Shuo, Lu Jun
College of Chemistry, Beijing Normal University Beijing 100875 PR China
Analytical and Testing Center, Beijing Normal University Beijing 100875 PR China.
RSC Adv. 2019 May 17;9(27):15561-15570. doi: 10.1039/c9ra01486a. eCollection 2019 May 14.
For traditional photocatalysts, the adsorption and successive surface reaction constitute a coupled and integrated process, owing to the limited number of catalytic active centres available. An attempt to boost the photocatalytic performance to optimize the adsorption and surface reaction process may be performed by exploring various photocatalyst infrastructures. Herein, we use a facile solvothermal method to synthesize a series of layered alkylammonium thiostannate hybrids, namely (baH)SnS, (haH)SnS and (oaH)SnS (ba = butylamine, ha = hexylamine, oa = octylamine). The hybrids showed broad UV-visible light absorption with appropriate band gaps. The inorganic/organic amphiphilic infrastructure of these hybrids enables them to exhibit prominent ion-exchange properties for Rhodamine B, with a large capacity over a wide pH range (1-11). And the adsorbed Rhodamine B is photodegraded within 30 minutes. A mechanistic study indicates that the adsorption and photodegradation steps are performed at the organic and inorganic layers within these hybrids, respectively, which are decoupled and independent. We conclude that the high-performance integrated adsorption-photodegradation ability is a consequence of the lipophilicity of intercalated alkylammonium and the photocatalysis performance of the 2D [SnS] monolayers.
对于传统光催化剂而言，由于可用的催化活性中心数量有限，吸附和后续的表面反应构成了一个耦合且一体化的过程。通过探索各种光催化剂结构，可以尝试提高光催化性能以优化吸附和表面反应过程。在此，我们采用简便的溶剂热法合成了一系列层状烷基硫代锡酸盐杂化物，即(baH)SnS、(haH)SnS和(oaH)SnS（ba = 丁胺，ha = 己胺，oa = 辛胺）。这些杂化物表现出具有适当带隙的宽紫外-可见光吸收。这些杂化物的无机/有机两亲性结构使其对罗丹明B表现出显著的离子交换性能，在较宽的pH范围（1 - 11）内具有大容量。并且吸附的罗丹明B在30分钟内被光降解。机理研究表明，吸附和光降解步骤分别在这些杂化物的有机层和无机层中进行，它们是解耦且独立的。我们得出结论，高性能的集成吸附-光降解能力是插层烷基铵的亲脂性和二维[SnS]单层的光催化性能的结果。
