硅藻土及其制品对有机物的吸附性质研究

发布时间：2018-05-24 00:53

  本文选题：硅藻土 + 二氧化钛　； 参考：《北京交通大学》2017年硕士论文

【摘要】：硅藻土自身是具有天然纳米孔径的重要矿物材料,它具有很好的强吸附性、大的比表面积、高孔隙度等特点,并且硅藻土也是一种很好的载体原料。本文采取物理和化学的方法对硅藻土进行纳米Ti02的负载,研究如何提高纳米Ti02/硅藻土复合材料的光催化性能,制备出具有高催化活性能的光催化材料。以四氯化钛作为钛源,硅藻土作为载体,用水解沉淀法制备纳米TiO2/硅藻土光催化材料。利用XRD、SEM、FT-IR、TG等表征方法分析得到不同预处理方法的硅藻土结构和吸附性能的比较,选出合适的预处理方法。采取单因素实验及正交实验相结合,从纳米Ti02的负载量、煅烧温度及锻烧时长三个因素来确定制备纳米Ti02/硅藻土复合材料的最佳工艺条件为:纳米TiO2负载量为35%,煅烧温度为600℃,煅烧时间为3h。Ti02/硅藻土复合光催化剂的吸附降解性能研究中,染料降解效率随着染液初始浓度的增高而降低;染液的降解效率随着Ti02/硅藻土复合光催化材料用量的增加也随之增加;染液的降解效率随着pH值的增加而逐渐减小。复合材料对罗丹明B的去除效果高达96.77%。利用硅藻土等材料制备成厚度为5毫米的硅藻土板材,并用此板分别与壁纸和壁布进行复合,测试并分析三种板材其对甲醛、甲苯的净化效率和持久性。
[Abstract]:Diatomite itself is an important mineral material with natural nano-pore size, which has good strong adsorption, large specific surface area, high porosity and so on. Diatomite is also a good carrier raw material. In this paper, Ti02 nanoparticles were loaded on diatomite by physical and chemical methods, and how to improve the photocatalytic properties of nano-diatomite composites was studied, and the photocatalytic materials with high catalytic activity were prepared. Nanometer TiO2/ diatomite photocatalytic material was prepared by hydrolysis precipitation method with titanium tetrachloride as titanium source and diatomite as carrier. The structure and adsorption properties of diatomite with different pretreatment methods were analyzed by XRDX SEMT-IRTG and the suitable pretreatment methods were selected. Using single factor experiment and orthogonal experiment, the loading amount of nanometer Ti02 was obtained. Three factors, calcination temperature and calcination time, were used to determine the optimum technological conditions for the preparation of nanosized Ti02/ diatomite composites: the loading amount of nanometer TiO2 was 35, and the calcining temperature was 600 鈩，

本文编号：1927061