聚苯胺光催化复合材料的制备及性能研究

发布时间：2018-03-09 15:55

本文选题：聚苯胺　切入点：掺杂　出处：《青岛科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：聚苯胺(PANI)与n型半导体光催化剂的界面形成p-n结,可提高材料的光催化性能。本文利用直接混合法制备不同酸体系的聚苯胺纳米纤维,利用水热法制备磷酸铋(BiPO_4)、钒酸铋(BiVO_4)光催化剂材料,利用原位复合法制备PANI光催化复合材料。采用X射线衍射仪、扫描电镜、紫外-可见分光光度计等设备,对光催化材料的晶型结构、形貌结构和光学性质进行表征分析,以亚甲基蓝染液为降解对象,探索制备条件和复合顺序对复合材料光催化性能的影响。同时对PANI的吸附性能进行了研究。主要研究结果如下:(1)BiPO_4存在下聚合生成PANI,形成BiPO_4/PANI复合材料,硫酸掺杂态PANI质量比为0.5%时降解性能最优,从纯BiPO_4的70%提高到83.3%。PANI存在下合成BiPO_4制备PANI/BiPO_4复合材料,磷酸掺杂态PANI质量比为7%时降解率最优,为93.81%。(2)BiVO_4存在下聚合生成PANI,形成BiVO_4/PANI光催化材料,硫酸掺杂态PANI质量比为0.5%时吸附性能最优,从纯BiVO_4的59.8%提高到81.3%。BiVO_4/PANI进一步与SiO_2复合形成BiVO_4/PANI/SiO_2三元材料,硫酸掺杂态PANI质量比为1%、Si/V摩尔比为2时降解率达94.8%。(3)硫酸掺杂态PANI对甲基橙的吸附率达95.6%,吸附量为23.9mg/g,其吸附极限达到45 mg/g,并具有良好的重复利用性。本征态PANI的吸附性能差,其吸附量在6 mg/g以下。掺杂态PANI的吸附性能随溶液pH值的减小而降低,随温度的升高而提高,在碱性环境中对阳离子染料具有良好的吸附效果。PANI的吸附过程符合伪一级反应动力学方程和Langmuir型吸附等温模型。
[Abstract]:The p-n junction between Polyaniline (pan) and n-type semiconductor photocatalyst can improve the photocatalytic performance of the materials. In this paper, Polyaniline nanofibers with different acid systems were prepared by direct mixing method. Bismuth phosphate BiPO4 and bismuth vanadate BiVO4) photocatalyst materials were prepared by hydrothermal method, and PANI photocatalytic composite materials were prepared by in-situ composite method. X-ray diffractometer, scanning electron microscope, UV-Vis spectrophotometer and so on were used. The crystal structure, morphology and optical properties of photocatalytic materials were characterized and analyzed. The methylene blue dye solution was used as the degradation object. The effects of preparation conditions and composition sequence on the photocatalytic properties of the composites were explored. The adsorption properties of PANI were also studied. When the mass ratio of sulfuric acid doped PANI is 0.5, the degradation rate of PANI/BiPO_4 composites is the best, from 70% of pure BiPO_4 to 83.3% of pani. The degradation rate of PANI/BiPO_4 composites is the best when the mass ratio of phosphoric acid doped PANI is 7. In the presence of 93.81% BiVO4, Pani was polymerized to form BiVO_4/PANI photocatalytic material. The adsorption performance of PANI doped with sulfuric acid was optimized when the mass ratio of PANI was 0.5, which increased from 59.8% of pure BiVO_4 to 81.3%. BiVO4 / pani further compounded with SiO_2 to form BiVO_4/PANI/SiO_2 ternary material. The molar ratio of sulfuric acid doped PANI to methyl orange is 95.6 and the adsorption capacity is 23.9 mg / g, and the adsorption limit is 45 mg / g, and the reusability of PANI is good. The adsorption capacity of the doped PANI is below 6 mg/g. The adsorption performance of the doped PANI decreases with the decrease of pH value of the solution and increases with the increase of the temperature. The adsorption of cationic dyes in alkaline environment. The adsorption process of pani accords with pseudo-first-order reaction kinetics equation and Langmuir adsorption isotherm model.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X713

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