木质素制备C-ZnO复合材料及其光催化性能研究

发布时间：2018-06-03 12:33

本文选题：木质素磺酸钠 + C　；参考：《东北林业大学》2015年硕士论文

【摘要】：随着环境污染的加剧,光催化作为一种降解有机污染物的绿色技术,高效并具有广泛的适用性,氧化锌便是其中一种性能优异的半导体光催化材料。炭材料因其较大的比表面积和丰富的孔隙结构常被用作催化剂或载体。将氧化锌和炭材料结合起来,采取较为简单的方法制备出更为高效和成本低廉的光催化复合材料,在处理有机污染物方面具有重大意义。本文采用制浆造纸废液中的木质素磺酸盐,辅助制备具有不同形貌的C-ZnO复合材料,对所制备的复合材料的光催化性能进行了研究,并得出复合材料的生长机制和光催化机理。主要内容如下：通过直接沉淀法,以木质素磺酸钠为表面活性剂和碳源,在水-乙醇混合溶剂中制备出了C-ZnO复合材料。通过XRD、拉曼光谱和XPS分析了复合材料的组成和结构,证明了复合材料中含有ZnO和碳。同时,探讨了不同木质素磺酸钠的添加量、烧结温度和溶液pH值对复合材料形貌、结构的影响,结果表明碳与氧化锌形成了以碳为基底,氧化锌从碳中生长出来的结构。对所制备的C-ZnO复合材料进行了光催化性能研究。由于材料的这种结构,使其在紫外光照射下能将有机污染物先吸附于催化剂的表层,然后吸附与光降解过程同时进行,这种协同作用使得材料的光催化效率得到提高。实验还通过调控木质素磺酸钠添加量,烧结温度,反应溶液的碱度和陈化高度来探究不同参数的变化对合成出的C-ZnO复合材料的光催化效率的影响,从中选择最佳制备方法。
[Abstract]:With the worsening of environmental pollution, photocatalysis as a green technology for the degradation of organic pollutants is highly efficient and widely applicable, among which zinc oxide is one of the excellent semiconductor photocatalytic materials. Carbon material is often used as catalyst or carrier because of its large specific surface area and abundant pore structure. It is of great significance to combine zinc oxide with carbon materials to prepare photocatalytic composites with higher efficiency and lower cost by means of simple methods. It is of great significance in the treatment of organic pollutants. In this paper, C-ZnO composites with different morphologies were prepared by using lignin sulfonate in pulping and papermaking waste liquor. The photocatalytic properties of the composites were studied, and the growth mechanism and photocatalytic mechanism of the composites were obtained. The main contents are as follows: C-ZnO composites were prepared by direct precipitation method using sodium lignosulfonate as surfactant and carbon source in water-ethanol mixed solvent. The composition and structure of the composites were analyzed by XRD, Raman spectroscopy and XPS. It was proved that the composites contain ZnO and carbon. At the same time, the effects of different amount of sodium lignosulfonate, sintering temperature and pH value on the morphology and structure of the composites were discussed. The results showed that carbon and zinc oxide formed the structure of carbon and zinc oxide grown from carbon. The photocatalytic properties of the prepared C-ZnO composites were studied. Due to this structure, organic pollutants can be adsorbed on the surface of the catalyst under UV irradiation, and then adsorbed at the same time as the photodegradation process. This synergistic effect improves the photocatalytic efficiency of the materials. The effects of different parameters on the photocatalytic efficiency of the synthesized C-ZnO composites were investigated by adjusting the amount of sodium lignosulfonate, sintering temperature, basicity and aging height of the reaction solution, and the optimum preparation method was selected.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332;O643.36

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