Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2018-05-03 Fen Zhang, Yongcai Zhang, Geshan Zhang, Zhanjun Yang, Dionysios D. Dionysiou, Aiping Zhu
Effective enhancement of the separation and transfer of photogenerated electrons and holes of semiconductor photocatalysts is key to increase their photocatalytic efficiency. This study aims at improving the photocatalytic performance of visible-light-responsive, CdI2-type layered SnS2 by employing good conductivity N-doped reduced graphene oxide (NRG) and polyaniline (PANI) as the receptors and transporters of photogenerated electrons and holes, respectively. PANI/SnS2/NRG ternary composites were prepared by a three-step method, and the optimum conditions for preparing the most efficient product were explored. The photocatalytic experiments demonstrated that the PANI/SnS2/NRG ternary composite prepared under the optimum conditions (PANI/SnS2/NRG-2%) had markedly higher photocatalytic activity than SnS2 nanoplates, SnS2/PANI and SnS2/NRG binary composites in the reduction of aqueous Cr(VI) under the irradiation of visible-light (λ > 420 nm). Based on comparison of the photoabsorption, photoluminescence and electrochemical impedance properties of PANI/SnS2/NRG, SnS2/PANI and SnS2, it was thought that the coupling of SnS2 with both PANI and NRG had synergistic effects in increasing the absorption of visible-light as well as the separation and transfer of photogenerated electrons and holes, which contributed to the exceptionally high photocatalytic activity of PANI/SnS2/NRG ternary composite. Moreover, it was discovered that the photocatalytic reduction of Cr(VI) over PANI/SnS2/NRG-2% was dominantly through the reduction by photogenerated electrons, whereas both photogenerated electron and superoxide anion radical (O2
–) reduction played important roles in the photocatalytic reduction of Cr(VI) over SnS2. Besides, the influences of photocatalytic testing conditions (including starting pH and concentration of Cr(VI) solution, and dosage of photocatalyst) on the efficiency of PANI/SnS2/NRG-2% in treatment of aqueous Cr(VI) were also examined.中文翻译：
通过与聚苯胺和N掺杂的还原氧化石墨烯偶联，异常协同增强SnS 2的光催化活性
有效增强光生电子和半导体光催化剂空穴的分离和转移是提高其光催化效率的关键。这项研究旨在通过采用良好电导率的N掺杂还原型氧化石墨烯（NRG）和聚苯胺（PANI）作为光生电子和空穴的受体和转运体，改善可见光响应的CdI 2型层状SnS 2的光催化性能。， 分别。通过三步法制备了PANI / SnS 2 / NRG三元复合材料，并探讨了制备最高效产品的最佳条件。光催化实验表明，PANI / SnS 2在最佳条件（PANI / SnS 2 / NRG-2％）下制备的/ NRG三元复合物在还原水Cr（VI）方面比SnS 2纳米板，SnS 2 / PANI和SnS 2 / NRG二元复合物具有明显更高的光催化活性。在可见光（λ> 420 nm）的照射下。通过比较PANI / SnS 2 / NRG，SnS 2 / PANI和SnS 2的光吸收，光致发光和电化学阻抗特性，可以认为SnS 2的偶联与PANI和NRG一起使用时，在增加可见光的吸收以及光生电子和空穴的分离和转移方面具有协同作用，这有助于PANI / SnS 2 / NRG三元复合材料具有极高的光催化活性。此外，还发现Cr（VI）在PANI / SnS 2 / NRG-2％上的光催化还原主要是通过光生电子的还原，而光生电子和超氧阴离子自由基（O 2
–）还原在SnS 2上光催化还原Cr（VI）发挥了重要作用。此外，还研究了光催化测试条件（包括初始pH和Cr（VI）溶液的浓度以及光催化剂的用量）对PANI / SnS 2 / NRG-2％处理Cr（VI）的效率的影响。。
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