Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, MS, India.
Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, MS, India.
Ultrason Sonochem. 2018 Mar;41:582-589. doi: 10.1016/j.ultsonch.2017.10.024. Epub 2017 Oct 26.
The present work deals with the preparation of graphene oxide (GO) using Hummers-Offeman method in the presence of ultrasonic irradiations. Further loading of TiO photocatalyst on prepared GO was accomplished which is basically oxidation reduction reaction between graphene oxide and titanium isopropoxide that leads to the formation of graphene-TiO nanocomposite. Graphene-Ce-TiO and Graphene-Fe-TiO nanocomposites were prepared using one step in-situ ultrasound assisted method using GO, titanium isopropoxide, cerium nitrate, ferric nitrate, and 2-propanol. The successfully prepared graphene-TiO, Graphene-Ce-TiO, Graphene-Fe-TiO nanocomposites were then characterized using XRD, SEM and TEM analysis. The obtained XRD patterns clearly indicates the formation of anatase TiO on graphene nanosheets and it also indicates the presence of Ce and Fe in the Graphene-Ce-TiO and Graphene-Fe-TiO nanocomposite respectively. Further the use of the prepared nanocomposites as a photocatalyst have been studied for the degradation of crystal violet dye. The effect of various parameters such as catalyst doping, catalyst loading and initial concentration of dye on its degradation were studied. The effectiveness of the prepared catalysts were compared for the degradation of crystal violet dye. It has been observed that Graphene-Fe-TiO exhibits maximum photocatalytic activity compared to Graphene-Ce-TiO and Graphene-TiO nanocomposite photocatalyst.
本工作采用 Hummers-Offeman 法在超声辐照下制备氧化石墨烯（GO）。进一步在制备的 GO 上负载 TiO2 光催化剂，这主要是氧化石墨烯和异丙醇钛之间的氧化还原反应，导致形成石墨烯-TiO 纳米复合材料。使用一步原位超声辅助法，使用 GO、异丙醇钛、硝酸铈、硝酸铁和 2-丙醇，制备了石墨烯-Ce-TiO 和石墨烯-Fe-TiO 纳米复合材料。成功制备的石墨烯-TiO、石墨烯-Ce-TiO、石墨烯-Fe-TiO 纳米复合材料随后通过 XRD、SEM 和 TEM 分析进行了表征。获得的 XRD 图谱清楚地表明在石墨烯纳米片上形成了锐钛矿 TiO，并且还表明在石墨烯-Ce-TiO 和石墨烯-Fe-TiO 纳米复合材料中分别存在 Ce 和 Fe。进一步研究了制备的纳米复合材料作为光催化剂对结晶紫染料的降解作用。研究了催化剂掺杂、催化剂负载和染料初始浓度等各种参数对其降解的影响。比较了制备的催化剂对结晶紫染料降解的效果。结果表明，与石墨烯-Ce-TiO 和石墨烯-TiO 纳米复合材料光催化剂相比，石墨烯-Fe-TiO 表现出最大的光催化活性。
