共查询到18条相似文献,搜索用时 49 毫秒
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以玻璃纤维为载体,将TiO2/Fe3+负载到其表面制成了空间玻璃纤维反应器。利用该反应器以高压汞灯为光源进行了光催化降解水中苯酚的试验研究,重点考察了H2O2及O2的协同作用对光催化氧化的影响。试验发现,H2O2的加入对HO.的产生有显著的引发作用,同时向溶液中充入O2可明显提高光催化效率,降低H2O2用量。试验结果表明,以UV365-250 W光源照射,在初始pH为3~5,O2通入量为1.0 L/(min.L),上升流速为0.7 m/min,H2O2浓度为0.1 mmol/L等试验条件下,初始质量浓度为30 mg/L的苯酚废水经120 min光催化反应后,其矿化率可达83%左右。 相似文献
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以TiCl4为原料,采用NH4NO3分解法制备了粒径在10~20am之间的二氧化钛.并用热分析仪、X光衍射仪、透射电子显微镜和比表面分析仪等对其进行了必要的表征.以高压汞灯为光源,研究了二氧化钛悬浮液对苯酚的催化降解作用,当苯酚的初始浓度为80mg/L,催化剂TiO2投加量为1.0
g/L和溶液的pH=3~4时,苯酚的光催化降解效率最好. 相似文献
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以磁性可分离材料四氧化三铁为核心,外层包覆无定型二氧化硅阻隔层保护四氧化三铁,制备出Si O2/Fe3O4内核(SF),再以Ti O2为活性物质,包覆于磁核外,制备出具有磁性可分离性能的臭氧催化剂T-SF。采用X射线衍射(XRD)和振动样品磁强计(VSM)和TEM对其表征,并考察了催化剂的臭氧催化草酸的活性。发现所制备的催化剂具有良好的催化臭氧化草酸的能力,并且具有良好的磁分离效应。 相似文献
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采用纳米级γ-Al_2O_3作为催化剂基体,制备γ-Al_2O_3负载氧化锰纳米催化剂来催化臭氧化降解水中的苯酚。采用浸渍法制备负载型的金属氧化物催化剂,以间歇反应的方式对不同浸渍浓度下催化剂的效能,不同催化剂投加量及苯酚溶液初始pH值等影响因素进行了深入研究。研究表明,4%Mn/γ-Al_2O_3催化剂显著提高了臭氧化降解水中苯酚的效果。催化剂投加量试验研究表明4%Mn/γ-Al_2O_3催化剂具有更多的活性位点。基于此,提出了催化臭氧化苯酚的反应机理。 相似文献
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利用化学法合成了新生态MnO2/凹凸棒土复合催化荆,对模拟苯酚废水进行了臭氧化处理,考察了不同条件对苯酚催化臭氧化过程的影响。结果表明,复合催化荆对体系臭氧化过程中苯酚的降解和COD的去除有显著的促进作用,含催化剂时反应动力学受体系pH值的影响程度明显减小。在pH=8.0的条件下,催化剂投加量以500mg/L为宜。适当操作条件下,体系COD的最高去除率可达85.3%。 相似文献
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The efficiency of catalytic ozonation with homogeneous (containing dissolved ions of Fe2+, Mn2+, Cu2+, Ni2+, Co2+, V5+, Cr3+, Mo6+) and heterogeneous (MnO2, Ni2O3, Fe2O3, CuO, Al2O3, CoO, V2O5, Cr2O3, MoO3, TiO2) catalysts and non-accompanied ozonation was compared for degradation of m-dinitrobenzene (m-DNB). Several transition metals in homogeneous and heterogeneous form improved significantly the ozone performance for degradation of m-DNB. This improvement was found to be due to supplementary formation of reactive species (hydroxyl radicals) and better ozone utilization. The effects observed were found to be strongly dependent on the treatment conditions. 相似文献
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The investigation of heterogeneous catalytic ozonation of sulfosalicylic acid (SSal) in aqueous solution is reported in this paper. It was found that catalytic ozonation in the presence of V-O supported on silica gel had a more positive effect on the removal rate (62% in 30 min) of total organic carbon (TOC) than that of ozonation alone (20% in 30 min), and the catalyst supported on TiO2 had similar results. The experimental results also showed that the ozone dosage should be sufficient for achieving the catalytic effect. Efficient removal of TOC in catalytic ozonation was probably attributed to producing more powerful oxidants than molecular ozone. 相似文献
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Libo Gao Qiang Zhang Junyang Li Ruiting Feng Hongyan Xu Chenyang Xue 《中国化学工程学报》2014,22(10):1168-1173
The adsorption of mesoporous Fe3O4–SiO2–TiO2 (MFST), which can be separated easily from solution by a mag-net, for the removal of methyl orange (MO) was investigated. The nitrogen adsorption–desorption... 相似文献
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This study focuses on the catalytic ozonation of organic matter recalcitrant to usual water treatment technologies. Experiments aimed to investigate the efficiency of the process TOCCATA®, which uses a granular catalyst coupled with ozonation. Comparison was made between single ozonation, single adsorption onto the catalyst and catalytic ozonation. Adsorption was proven to contribute to decreased dissolved organic carbon. Catalytic ozonation enhanced organic matter removal and ozone transfer compared to single ozonation. Catalytic ozonation was modeled with global apparent first-order kinetics and single adsorption with pseudo–second-order sorption kinetics. 相似文献
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本文采用浸渍法制备得到一系列过渡金属(Fe、Cu、Mn等)负载的改性沸石(ZSM-5)催化剂,并以苯酚为目标污染物,考察溶液初始pH值、苯酚初始浓度、催化剂投加量、H_2O_2投加量等因素对催化降解苯酚效果的影响。Fe-Mn-Cu-ZSM-5催化剂在pH=2-8范围内均能高效催化氧化苯酚废水。处理浓度为100 mg·L~(-1)的苯酚时,加入1 m L/L 30%H_2O_2和2g/L Fe-Mn-Cu-ZSM-5催化剂,在紫外光照下反应60 min,其苯酚去除率大于90%。通过分析Fe-Cu-Mn-ZSM-5催化氧化苯酚的UV-VIS谱图和参考有关的文献,推断其反应机理为羟基自由基机理和光生空穴氧化机理的结合。 相似文献
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本实验以钛酸四丁酯为前驱物,乙醇和正己烷作为晶形导向剂,通过水热法合成不同晶形的TiO2催化剂。催化剂的结构特性采用X射线衍射(XRD)来表征。催化剂的催化活性通过对水中草酸晶形催化臭氧化降解来进行评估;通过研究叔丁醇对催化剂臭氧化反应的影响,证明反应遵循羟基自由基(HO·)反应机理。 相似文献