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| 折扣與優(yōu)惠：團(tuán)購(gòu)最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:本文以凹凸棒石(ATP)為載體，鈦酸四丁酯和六水合硝酸鈰為原料，采用溶膠-凝膠法制備ATP/CeO2-TiO2納米復(fù)合材料。通過TG、TEM、XRD、FTIR、N2吸附脫附等測(cè)試手段對(duì)樣品的微觀結(jié)構(gòu)進(jìn)行表征。以羅丹明B為模擬廢水進(jìn)行了催化降解實(shí)驗(yàn)，考察復(fù)合材料的催化性能并對(duì)其催化氧化機(jī)理進(jìn)行初步探討。 研究表明，對(duì)ATP/CeO2-TiO2納米復(fù)合材料而言，當(dāng)鈰鈦摩爾比≥3:7時(shí)，鈰鈦氧化物可以形成固溶體均勻負(fù)載于ATP表面。最佳煅燒溫度在400 ℃左右，過高的煅燒溫度會(huì)造成凹凸棒石載體塌陷；而過低的煅燒溫度會(huì)使氧化物無法獲得較好的結(jié)晶度。當(dāng)鈰鈦摩爾比為5:5，溶膠-凝膠反應(yīng)溫度為30 ℃，煅燒溫度為400 ℃時(shí)，氧化物均勻分散在ATP表面，得到具有介孔結(jié)構(gòu)的ATP/CeO2-TiO2復(fù)合材料。這種復(fù)合材料具有較好的催化性能，以臭氧為氧化劑，對(duì)羅丹明B模擬有機(jī)廢水溶液的COD降解率達(dá)93%。 關(guān)鍵詞：凹凸棒石；溶膠-凝膠；ATP/CeO2-TiO2；催化降解
Abstract:In this research, ATP/CeO2-TiO2 nanocomposites were synthesized by sol-gel method using ATP as support, cerium nitrate hexahydrate, tetrabutyl titanate as raw materials. The microstructures of the as-prepared nanocomposites were characterized by thermogravimetric (TG), transmission electron microscopy (TEM), X-ray diffraction (XRD), fourier transform infrared spectrometer (FTIR), N2 sorption-desorption. The catalytic oxidation properties of ATP/CeO2-TiO2 could be determined by the degradation test of Rhodamine B, the simulated wastes and the catalytic mechanism of ATP/CeO2-TiO2 nanocomposites was analyzed in this discussion. Results showed that the solid solution of Ce and Ti oxides were loaded on the surface of ATP evenly in the case of Ce:Ti(molal ratio)≥3:7. The optimized calcination temperature was found around 400 ℃. The higher calcination temperature led to the collapse of ATP, on the contrary, lower calcination temperature would impede the oxides to get a higher degree of crystallinity. Well-defined ATP/CeO2-TiO2 nanocomposites owning mesoporous structure can be prepared successfully, when Ce:Ti(molal ratio) was 5:5 and the sol-gel temperature was 30 ℃. This nanocomposites demonstrated enhanced catalytic property as compared to ATP/CeO2 and ATP/TiO2. The COD removal efficiency of ATP/CeO2-TiO2(Ce:Ti=5:5) for Rhodamine B could reach 93%. Key words: attapulgite; sol-gel; ATP/CeO2-TiO2; catalytic degradation
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