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采用阳离子表面活性剂十六烷基二甲基溴化铵对临安膨润上进行改性修饰，以钛酸丁酯和K2P1Cl6为前驱体，利用掺有小同量铂的TiO2溶胶对改性膨润土进行反应，制得一系列掺铂有机-钛柱撑膨润土复合材料。测定了复合材料的BET比表面积，利用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）和能量分散光谱（EDS）等手段对其微观结构进行了表征。以甲基橙染料为目标污染物，考察了复合材料的吸附能力和光催化活性。实验结果表明，掺铂的有机-钛柱撑膨润土复合材料比未掺铂的复合材料具有较好的层状结构，且对甲基橙的吸附能力较佳。由于铂能够充当捕获载流子的陷阱，能够有效抑制TiO2光生电子-空穴的复合，所以掺铂有机-钛柱撑膨润土复合材料具有更好的光催化性能，其中掺铂量为0．2％的复合材料的光催化活性最佳，对甲基橙的降解效果最好。 相似文献
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Mengkui TIAN Wenfeng SHANGGUAN Shijie WANG Ziyuan OUYANG 《中国地球化学学报》2006,25(B08):121-122
From primitive wood to nowadays fossil fuels such as coal, oil and natural gas, it can be seen that the forms of energy becomes more and more diverse and the core trend of decarburization is also obvious （the rate of the element of H to C ranging from 1/10, 1/2-1, 2, to 4 in wood, coal, oil and natural gas, respectively）. Although the content of C in current main fuels becomes less and less, the excess exploitation and extensive utilization of various fossil fuels are widely recognized to be responsible for the deterioration of the environment （greenhouse effect, acid rain, photochemical pollution, etc.）. With the roar consumption of energy to maintain the development of human society and taking the environmental problems into consideration, it is inevitable to develop renewable energy containing more H and less C as possible. Under these circumstances, the development of H2 energy is the certain and ultimate choice for its high energy per unit, diversity resources, no pollution to environment and ideal renewable utilization cycle. There are so many methods and ways were employed to develop HE energy, such as electrolysis, methane stream reforming process, coal gasification, etc., but there lies two main problems in current methods and ways, those are the cost of bulk of first energy to extract HE from fossil raw materials and still facing the problems of C deposition （carbon dioxide）. Consequently, if considering the cost and environmental issues, the development of HE energy must resort to renewable energy sources such as solar energy, wind energy to extract HE from water. Based on this context, the development of HE energy by semiconductor photocatalyst to split water into HE and O2 under the irradiation of solar energy, photocatalysis process in short word, is one of the most promising ways. In this review, the importance and necessity to develop hydrogen energy were intensively studied based on the relationship between energy consumption and environment effect. Then the current ways and methods to develop hydrogen were reviewed, especially the state-of-the-art photocatalysis process （from the semiconductor photocatalyst materials perspective）. 相似文献
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天然含铁闪锌矿的可见光催化还原活性研究 总被引：2，自引：0，他引：2
通过电子探针(EMPA)、X射线光电子能谱(XPS)、漫反射谱(DRS)、光致发光谱(PL)、透射电镜(TEM)、扫描电镜(SEM)和霍尔效应(Hall-effect)等测试手段对天然闪锌矿样品的半导体物理化学性能进行了表征分析。分析结果认为,天然闪锌矿良好的可见光响应性能主要源自其晶格内丰富的类质同像替代离子。此外,样品中的变价元素Fe能够参与价带光生空穴的捕获,提高导带光生电子的利用率,从而提高其光催化活性。样品中丰富的缺陷也有利于光催化活性的提高,大量的解理面和裂开面能够提供较完整的晶面增加反应活性点位,空位缺陷和晶格膨胀畸变等可以提高光生电子空穴对的分离效率。与其特殊的物理化学性质相符,天然闪锌矿光催化还原降解甲基橙的实验证明了其较高的可见光催化还原活性。本研究结果也预示着天然半导体矿物闪锌矿作为一种新的低成本、高效率的可见光催化材料将在环境污染治理领域具有一定的应用前景。 相似文献
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采用酸性溶胶法制备掺铁-TiO2/膨润土复合光催化剂,利用XRD﹑IR等测试手段对其进行了表征。通过测试甲基橙溶液的脱色率和COD去除率对复合光催化剂的光催化活性进行了评价。结果表明,该催化剂有较高的催化氧化性能,在太阳光照射下,对pH=4﹑质量浓度为20 mg/L的甲基橙溶液进行降解时,其脱色率可达95%以上,COD去除率可达85%以上。该催化剂在经过200℃焙烧活化2.5 h后可多次重复利用。 相似文献