二硫化钼纳米复合材料制备及光催化性能研究

发布时间：2018-11-12 16:13

【摘要】：近几年来,工业废水的肆意排泄,人们生活用水的不合理处理都对我们的生态环境造成重度污染,如何高效率的降解污染物是我们目前要解决的重要问题。本论文通过水热法制备获得了两种以MoS_2为基底的复合材料:MoS_2/BiVO_4和MoS_2/ZnS,对材料进行表征,并研究了光催化性能,主要研究工作如下:(1)研究尺寸大小对MoS_2微纳材料光催化性能的影响。结果表明:小尺寸的MoS_2光催化性能更好。光催化亚甲基蓝(MB)试剂,仅用120分钟,降解效率就达41.4%。(2)研究物料配比对MoS_2/BiVO_4复合材料的形貌及光催化性能的影响。结果表明:物料配比不同使MoS_2/BiVO_4形貌发生变化。可见光条件下,与纯MoS_2对比,MoS_2/BiVO_4光催化降解MB结果更明显。并且含量上BiVO_4所占比重逐渐增多,复合材料的光催化能力逐渐提高,其中,当物料摩尔比MoS_2:Bi(NO_3)_3:NH_4VO_3为6:5:5时,合成的MBV5样品光催化性能最优,仅用120分钟,降解效率就为71%。(3)研究MB浓度对MoS_2/ZnS复合材料光催化性能的影响。结果表明:MoS_2/ZnS形貌呈微球状,尺寸约为2μm,结晶质量较好。可见光条件下,MoS_2/ZnS光催化性能更优异。当MB浓度为15mg·L-1,加入20mg的MoS_2/ZnS,光照120分钟,降解效率高达99.8%。
[Abstract]:In recent years, the wanton discharge of industrial wastewater and unreasonable treatment of people's domestic water have caused serious pollution to our ecological environment. How to degrade pollutants efficiently is an important problem that we need to solve at present. In this paper, two kinds of composites based on MoS_2: MoS_2/BiVO_4 and MoS_2/ZnS, were prepared by hydrothermal method, and their photocatalytic properties were studied. The main research work is as follows: (1) the effect of size on photocatalytic performance of MoS_2 micro / nano materials is studied. The results show that the photocatalytic performance of small size MoS_2 is better. The degradation efficiency of the photocatalytic methylene blue (MB) reagent was 41.4% in 120 minutes. (2) the effect of the ratio of materials on the morphology and photocatalytic performance of MoS_2/BiVO_4 composite was studied. The results showed that the morphology of MoS_2/BiVO_4 was changed with different material ratio. Compared with pure MoS_2, the photocatalytic degradation of MB by MoS_2/BiVO_4 was more obvious under visible light. And the proportion of BiVO_4 increased gradually, and the photocatalytic ability of the composite was improved gradually. When the molar ratio of MoS_2:Bi (NO_3) _ 3:NH_4VO_3 was 6:5:5, The photocatalytic activity of the synthesized MBV5 samples was the best, and the degradation efficiency was 71g in 120 minutes. (3) the effect of MB concentration on the photocatalytic performance of MoS_2/ZnS composites was studied. The results show that the morphology of MoS_2/ZnS is microsphere, the size is about 2 渭 m, and the crystal quality is good. Under visible light, the photocatalytic performance of MoS_2/ZnS is better. When the concentration of MB was 15mg L -1, the degradation efficiency of MoS_2/ZnS, was 99.8 when 20mg was added to MoS_2/ZnS, for 120 minutes.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;O644.1

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