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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要：本論文以乙酸鈰(Ce(CH3CO2)3)，乙酸鐠(Pr(CH3CO2)3)為原料，以三嵌段共聚物聚P123為模板，利用溶劑揮發(fā)自組裝的方法合成了一系列具有高活性的介孔CeO2及CeO1-xPrxO2粉體。利用X射線衍射(XRD)，能譜(EDS)，紅外分析(FT-IR)，透射電鏡(TEM)及氮氣脫吸附等手段對材料進(jìn)行分析和表征。并且對粉體催化降解染料廢水進(jìn)行研究，討論影響有機(jī)廢水降解率的因素。 結(jié)果表明，以乙酸鈰為原料，P123為模板，在煅燒溫度為400℃的條件下，可以獲得比表面積達(dá)135m2/g的介孔CeO2，孔徑分布范圍2-4nm。在介孔Ce1-xPrxO2的合成過程中，隨著鐠摻雜量的增加，Ce1-xPrxO2的比表面積不斷增大，對酸性品紅染料廢水的催化降解能力不斷提高。當(dāng)乙酸鈰和乙酸鐠的摩爾比為5:5時，合成產(chǎn)物對酸性品紅表現(xiàn)出優(yōu)良的催化降解效果，在250min時降解率可以達(dá)到100%。 關(guān)鍵詞：介孔；CeO2；CeO1-xPrxO2；催化降解
Abstract: Mesoporous CeO2 and Ce1-xPrxO2 powders with highly active were synthesized via a evaporation-induced self assembly(EISA) method with cerium acetate hydrate (Ce(CH3CO2)3) and praseodymium acetate hydrate (Pr(CH3CO2)3) as starting materials and triblock copolymer P123 as templates. XRD, EDS, FT-IR, TEM and BJH techniques were used to analyze and characterize the samples. And studied on the catalytic degradation of dyeing wastewater with powders, then discussed the impact of organic wastewater degradation rate factors. The results showed that mesoporous CeO2 with specific surface area of 135m2/g, pore size ranged from 2 to 4 nm was obtained under the condition as follows: cerium acetate hydrate as starting materials, P123 as templates and the calcination temperature was 300℃. Specific surface area rise with increasing of doping content of Pr during the process of synthesize mesoporous Ce1-xPrxO2, and increasing the ability of the catalytic degradation of acid fuchsin dyeing wastewater. For acid fuchsin, synthetic products exhibited excellent catalytic degradation effect when x is 0.5, and the degradation rate could reached 100% in 250 minutes. Key words：mesoporous；CeO2；Ce1-xPrxO2；catalytic degradation
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