Electrophoretic Deposition of Graphene Oxide and Reduced Graphene Oxide on the Rutile Phase of TiO2 Nanowires for Rapid Reduction of Cr (VI) under Simulated Sunlight Irradiation
Electrophoretic Deposition of Graphene Oxide and Reduced Graphene Oxide on the Rutile Phase of TiO2 Nanowires for Rapid Reduction of Cr (VI) under Simulated Sunlight Irradiation
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DOI：
10.3390/catal12101282
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发表时间：
2022-10
期刊：
影响因子：
3.9
通讯作者：
Subagja Toto Rahmat;N. Alias;Rajesh Kumar;W. K. Tan;G. Kawamura;A. Matsuda;Z. Lockman
中科院分区：
文献类型：
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作者：
Subagja Toto Rahmat;N. Alias;Rajesh Kumar;W. K. Tan;G. Kawamura;A. Matsuda;Z. Lockman
六价铬是非常致癌的，因此，在处理废水之前将其去除是很重要的。本研究报道了利用石墨烯衍生的TiO2纳米线（TNW）复合材料在模拟阳光下光还原Cr（VI）。在金红石相tnw上进行了氧化石墨烯（GO）和还原氧化石墨烯（rGO）的电泳沉积（EPD）。在750℃下，在1M氢氧化钾雾的存在下，对钛箔进行热氧化制备TNWs。钛纳米波均匀地覆盖在钛箔表面。将氧化石墨烯或还原氧化石墨烯的EPD作为时间的函数来生成不同厚度的沉积物。在可见光下测试了GO/TNWs或rGO/TNWs对Cr（VI）的光催化性能。rGO/TNWs对Cr（VI）的还原性能优于GO/TNWs。在可见光下，在TNW样品上沉积10秒的还原氧化石墨烯可以在30分钟内还原10 mg/L的Cr(VI)，这可能是由于从还原氧化石墨烯到TNW的高电子转移加速了Cr（VI）的还原。
Hexavalent chromium is very carcinogenic, and it is, therefore, important to remove it from wastewater prior to disposal. This study reports the photoreduction of Cr(VI) under simulated sunlight using graphene-derived TiO2 nanowire (TNW) composites. Electrophoretic deposition (EPD) of graphene oxide (GO) and reduced graphene oxide (rGO) was carried out on rutile phase TNWs. The TNWs were fabricated by thermal oxidation of titanium foil in the presence of 1M potassium hydroxide mist at 750 °C. The TNWs uniformly covered the surface of the titanium foil. EPD of GO or rGO was done as a function of time to produce deposits of different thicknesses. The photocatalytic performances of the GO/TNWs or rGO/TNWs were tested to reduce Cr(VI) under visible light. The performance of rGO/TNWs in reducing Cr(VI) was better than GO/TNWs. A 10-second-deposited rGO on TNW samples can reduce 10 mg/L Cr(VI) within 30 min under visible light, likely as a result of the high electron transfer from rGO to TNWs accelerating the Cr(VI) reduction.