การสังเคราะห์วัสดุซิลเวอร์ไทเทเนียมเอ็มซีเอ็ม 41 โดยการให้ความร้อนด้วยไมโคเวฟสำหรับการบำบัดสีย้อม

Abstract

Ag-Ti-RH-MCM-41 was successfully synthesized via in-situ sol-gel technique with microwave irradiation and rice husk was used as a source of silica. There are two steps of Ag-Ti-RH-MCM-41 material preparation for dye decolorization under visible light, 1) synthesis of Ag-Ti-RH-MCM-41 by mixing a Ag-doped TiOz solution and a solution of CTAB and sodium silicate and then heating in domestic microwave oven. Finally, the obtained solid were calcined to remove CTAB template and 2) coating of the synthesized Ag-Ti-RH-MCM-41 on a recycled polystyrene foam sheet for the convenient use in dye water treatment application. In this study, the effect of microwave power, irradiation time and the concentration of Ag on the characteristic pattern of the synthesized Ag-Ti-RH-MCM-41 were investigated. According to the studies of crystal structure by XRD technique, there were the characteristic peaks of anatase TiO, and Ag nanoparticles whereas three characteristic peaks of RH-MCM-41 were not shown. In addition, the results from XPS technique confirmed the formation of Ti-O-Si bond indicating that the Tif replaced Si"* in the silicate framework of MCM-41. SEM-EDX technique exhibited the uniform dispersion of Si, Ti and Ag on the surface of MCM-41. The studies of photocatalytic performance of methylene blue dye and Rhodamine B decolorization indicated that Ag-Ti-RH-MCM-41 performs effective photocatalytic activity under visible light which corresponds to the UV-DRS results. The optimal conditions of Ag-Ti-RH-MCM-41 synthesis is 100 watts of microwave power, 30 minutes of irradiation time and 0.1 mol Ag: 1 mol Ti: 2 mol Si ratios as indicated by photocatalytic decolorization results.