【摘要】：三氧化鉬有多種晶相,在合成過程中,不同合成方法,或者是同一合成方法不同合成條件都會影響其結構、形貌、性能。本研究以水熱法為例,探討了不同合成條件對MoO3的影響,并篩選出形貌均勻的MoO3作為主催化劑。鑒于純相MoO3的催化氧化能力有限,因此本文重點研究了改性的Ce摻雜材料,比較不同降解條件、降解環(huán)境對材料降解性能的影響,提出節(jié)能環(huán)保、凈化污染物的最優(yōu)方案。本文主要研究內(nèi)容和研究成果如下：(1)以四水合鉬酸銨((NH4)6Mo7O24·4H2O)為鉬源,與稀硝酸水熱反應合成六方相三氧化鉬(h-MoO3),同時考察了反應溫度、反應時間、硝酸含量對產(chǎn)物結構的影響。(2)以MoO3為主催化劑,以不同含量的Ce(NO3)3·6H2O溶液為Ce源,采用浸漬煅燒法制備一系列CeO2摻雜的MoO3 (Ce(x)/MoO3,x代表CeO2在MoO3中的質(zhì)量百分數(shù))。同時運用SEM、XRD、HRTEM、SAED、FT-IR等分析手段對催化材料進行一系列表征。(3)考察催化劑的催化性能,分別在無光照/有光照(可見光)條件下降解有機污染物亞甲基藍(MB)、甲基橙(MO)。研究表明Ce(5)/MoO3催化氧化性能優(yōu)良,與純相MoO3催化活性相比,無光、有光條件下催化劑性能均提高了百倍以上。其中在可見光條件下,摻雜材料的帶隙顯著減小,因此光吸收能力也將明顯增強,光催化性能隨之提高。在本論文中,首先探究了催化材料的在無光條件下的催化性能,從節(jié)能環(huán)保角度,為環(huán)境污染物的降解提供了新思路。同時本文也首次將Ce摻雜的MoO3材料運用于光催化領域,其展現(xiàn)出的良好降解性能為擴展Mo基摻雜材料指明了新的應用及發(fā)展方向。
文內(nèi)圖片：
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[Abstract]:There are many crystal phases of Mo _ 2O _ 3. In the process of synthesis, different synthesis methods, or different synthesis conditions, will affect the structure, morphology and properties of Mo _ 2O _ 3. In this study, taking hydrothermal method as an example, the effects of different synthesis conditions on MoO3 were discussed, and MoO3 with uniform morphology was selected as the main catalyst. In view of the limited catalytic oxidation ability of pure phase MoO3, the modified Ce doping materials were studied in this paper. the effects of different degradation conditions and degradation environment on the degradation properties of the materials were compared, and the optimal scheme of energy saving and environmental protection and purification of pollutants was put forward. The main contents and research results of this paper are as follows: (1) hexagonal molybdate trioxide (h-MoO3) was synthesized by hydrothermal reaction of ammonium molybdate tetrahydrate (NH4) 6Mo7O24 路4H2O) with dilute nitric acid. The effects of reaction temperature, reaction time and nitric acid content on the structure of the product were investigated. (2) MoO3 was used as catalyst and Ce (NO3) 3 路6H2O solution with different content was used as Ce source. A series of CeO2-doped MoO3 (Ce (x) / MoO3,x were prepared by impregnation and calcination method, which represented the mass percentage of CeO2 in MoO3. At the same time, a series of characterization of catalytic materials were carried out by SEM,XRD,HRTEM,SAED,FT-IR and other analytical methods. (3) the catalytic performance of the catalyst was investigated, and the degradation of methylene blue (MB), methyl orange (MO). Without light / light (visible light) was investigated. The results show that the catalytic oxidation performance of Ce (5) / MoO3 is better than that of pure phase MoO3. Compared with pure phase MoO3, the catalyst performance is more than 100 times higher than that of pure phase MoO3. Under the condition of visible light, the band gap of the doped materials is significantly reduced, so the optical absorption capacity will also be significantly enhanced, and the photocatalytic performance will be improved. In this paper, the catalytic performance of catalytic materials under the condition of no light is investigated, which provides a new idea for the degradation of environmental pollutants from the point of view of energy saving and environmental protection. At the same time, Ce-doped MoO3 materials are also applied to the field of photocatalysis for the first time, and their good degradation performance indicates a new application and development direction for the expansion of Mo-based doping materials.
【學位授予單位】：南京信息工程大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：O643.36;X703

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本文編號：2510319