Khabiri Gomaa, Aboraia Abdelaziz M, Omar S, Soliman Malak, Omar Asmaa M A, Kirichkov Mikhail V, Soldatov A V
Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090, Rostov-on-Don, Russia. Physics Department, Center for Environmental and Smart Technology (CEST), Faculty of Science, Fayoum University, Fayoum 63514, Egypt.
Nanotechnology. 2020 Nov 20;31(47):475602. doi: 10.1088/1361-6528/aba212.
Molybdenum disulfide (MoS) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS Quantum dots (QDs) were synthesized via the ultrasonication technique to construct heterostructure with SnS nanosheets (SnS@MoS QDs) and the prepared materials were tested for photocatalytic applications for Methylene blue (MB). Pristine SnS and SnS@MoS QDs nanocomposite were analyzed by XRD, TEM, PL, and Uv-Vis. Both SnS and SnS@MoS QDs exhibited a single trigonal phase with the P-3m1 space group. The TEM analysis confirmed the coupling between the pristine SnS and SnS@MoS QDs. The results of photocatalytic activity toward MB indicated that SnS@MoS QDs material exhibits much superior photocatalytic performance compared to pristine SnS. The excellent photodegradation performance of SnS@MoS QDs is due in the main to the formation of heterojunction between SnS and MoS QDs with narrow bandgap formation, which results in a facile carriers transfer and thus high photocatalytic efficiency. A representative mechanism of the photodegradation for SnS@MoS QDs photocatalyst was proposed. Such an ultrasonic technique is capable of producing small metallic particle size that can be used to construct new heterostructures for water remediation applications.
二硫化钼（MoS）最近被认为是一种用于潜在光催化应用的有效材料；然而，由于活性位点密度低，其光催化活性受到限制。在这项工作中，通过超声技术合成了MoS量子点（QDs），以与SnS纳米片构建异质结构（SnS@MoS QDs），并测试了所制备材料对亚甲基蓝（MB）的光催化应用。通过XRD、TEM、PL和紫外可见光谱对原始SnS和SnS@MoS QDs纳米复合材料进行了分析。SnS和SnS@MoS QDs均呈现具有P-3m1空间群的单一三方相。TEM分析证实了原始SnS和SnS@MoS QDs之间的耦合。对MB的光催化活性结果表明，与原始SnS相比，SnS@MoS QDs材料表现出更优异的光催化性能。SnS@MoS QDs优异的光降解性能主要归因于SnS和MoS QDs之间形成了具有窄带隙的异质结，这导致了载流子的轻松转移，从而具有高光催化效率。提出了SnS@MoS QDs光催化剂光降解的代表性机理。这种超声技术能够产生小尺寸的金属颗粒，可用于构建用于水修复应用的新型异质结构。
