准分子灯光催化降解难降解有机污染物

发布时间：2018-05-09 04:30

本文选题：准分子灯 + 光催化　；参考：《江苏理工学院》2016年硕士论文

【摘要】：采用准分子紫外光解/光催化降解两种体系对难降解有机污染物进行降解。通过建立动力学模型,计算光子效率定量评价了光催化反应器的性能,考察了初始浓度、外加氧化性离子、外加氧化剂对去除效果的影响,研究了准分子灯光催化降解有机物的反应机制;探讨了该体系降解实际印染和农药废水的可行性。具体结果如下:(1)采用动力学模型对苯酚的降解进行拟合,表明光解和光催化体系中苯酚的降解均符合准一级动力学模型。计算体系的全额光子效率,定量评价体系的光催化性能。研究发现,加入催化剂和提高初始c(苯酚)可以提高体系的光催化性能。辐射功率为0.76W、初始c(苯酚)为1.10 mmol/L、ρ(催化剂)为0.8 g/L的条件下,全额光子效率为5.56%。利用高效液相色谱测定了苯酚光催化降解生成的中间产物,其表现为c(对苯二酚)c(邻苯二酚)c(对苯醌)c(间苯二酚);通过建立苯酚及中间产物的拟一级降解动力学模型,证实苯酚光催化降解历程为苯酚→芳香烃中间产物→最终产物。(2)四种准分子光源(KrBr*、KrCl*、XeBr*和Hg)对邻苯二甲酸二甲酯(DMP)光解的去除率按照KrBr*KrCl*Xe Br*Hg依次降低。采用KrBr*灯光解DMP,研究发现,光解过程中产生了O3、O2-?、?OH、HO2?和H2O25种活性物质,贡献率大小分别为:?OH(56.6%)O3(12.8%)O2-?/HO2?/H2O2(9.5%),UV直接光解贡献率约占21.1%。(3)通过对比不同光源、外加氧化性物质对DMP直接光解和光氧化降解的影响,证实污染物光解受制于两个条件:直接光解取决于污染物自身能吸收光发生分解;间接光解取决于外加氧化剂能吸收紫外光产生活性基团而非自身光解。(4)采用准分子灯光催化降解实际废水(印染、农药),探讨了准分子灯废水深度治理的可行性。
[Abstract]:Excimer UV photolysis / photocatalytic degradation was used to degrade refractory organic pollutants. The kinetic model was established to quantitatively evaluate the performance of photocatalytic reactor by calculating photon efficiency. The effects of initial concentration, addition of oxidizing ions and oxidant on the removal efficiency were investigated. The mechanism of photocatalytic degradation of organic compounds by excimer light was studied, and the feasibility of degradation of actual printing and dyeing wastewater and pesticide wastewater by this system was discussed. The results are as follows: (1) the kinetic model is used to fit the degradation of phenol, which shows that the degradation of phenol in photocatalytic system is in accordance with the quasi-first-order kinetic model. The full photon efficiency of the system was calculated and the photocatalytic performance of the system was evaluated quantitatively. It was found that the photocatalytic activity of the system could be improved by adding catalyst and increasing the initial C (phenol). When the radiation power is 0.76 W, the initial c (phenol) is 1.10 mmol / L and 蟻 (catalyst) is 0.8 g / L, the full photon efficiency is 5.56. The intermediate products produced by photocatalytic degradation of phenol were determined by high performance liquid chromatography (HPLC), which were characterized as c (hydroquinone) (catechol) c (p-benzoquinone) (resorcinol), and the pseudo-first-order degradation kinetic model of phenol and its intermediate products was established. It is confirmed that the photocatalytic degradation process of phenol is the final product of phenol aromatics intermediate product. (2) the photolysis efficiency of dimethyl phthalate (DMP) by four excimer light sources, KrBrln, XeBr* and Hg2, is decreased according to KrBr*KrCl*Xe Br*Hg. Using KrBr* light to hydrolyze DMPs, it was found that O3O2-OHHHO2 was produced during photolysis. And the active substances of H2O25 species, the contribution rate is 56.6%, respectively, and the contribution rate is about 21.1% by comparing the direct photolysis contribution of different light sources and the addition of oxidizing substances on the direct photolysis and photooxidative degradation of DMP by comparing the direct photolysis of DMP with O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2 / H _ 2O _ 2, respectively. It is proved that the photolysis of pollutants is restricted by two conditions: direct photolysis depends on the ability of the pollutants to absorb light to decompose; Indirect photolysis depends on the addition of oxidant can absorb ultraviolet light to produce active group instead of self-photolysis. It uses excimer light to catalyze the degradation of actual wastewater (printing and dyeing, pesticide, etc.) the feasibility of deep treatment of excimer lamp wastewater is discussed.
【学位授予单位】：江苏理工学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703

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