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161.
Comparison of dynamic adsorption/desorption characteristics of toluene on different porous materials
Four different types of adsorbents, SBA-15, MCM-41, NaY and SiO2, were used to study the dynamic adsorption/desorption of toluene. To further investigate the influence of pore structure on its adsorption performance, two SBA-15 samples with different microspores were also selected. It is shown that microporous material NaY has the largest adsorption capacity of 0.2873 mL/g, and the amorphous SiO2 exhibits the least capacity of 0.1003 mL/g. MCM-41 also shows a lower break through capacity in spite of the relatively small pore diameter, because it can not provide the necessary small geometric confinement for the tiny adsorbates. However, the mesoporous SBA-15 silica with certain micropore volume shows relatively higher adsorption capacity than that of MCM-41 silica. The presence of micropores directly leads to an increase in the dynamic adsorption capacity of toluene. Although NaY has the highest adsorption capacity for toluene, its complete desorption temperature for toluene is high (>350℃), which limits its wide application. On the contrary, mesoporous silica materials exhibits a good desorption performance for volatile organic compounds at lower temperatures. Among these materials mesoporous SBA-15 samples, with a larger amount micropores and a lower desorption temperature, are a potentially interesting adsorbent for the removal of volatile organic compounds. This behavior should been related with the best synergetic effect of mesopores and micropores. 相似文献
162.
A wire-mesh catalyst coated by La0.8Sr0.2MnO3 was combined with a dielectric barrier discharge (DBD) reactor for toluene removal at atmospheric pressure. It was found that toluene removal efficiency and carbon dioxide selectivity were enhanced in the catalytic packed-bed reactor. In addition, ozone and nitrogen monoxide from the gas effluent byproducts decreased. This is the first time that ultrasound combined with plasma has been used for toluene removal. A synergistic effect on toluene removal was observed in the plasma-assisted ultrasound system. At the same time, the system increased toluene conversion and reduced ozone emission. 相似文献
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以相对产甲烷活性(RA)和COD去除率为指标,考察不同浓度甲苯二胺对厌氧污泥微生物活性的影响。实验结果表明:甲苯二胺质量浓度为0~150 mg/L时,RA接近100%甚至高于100%,COD去除率为91%~93%,与对照组无差别,对厌氧微生物几乎没有抑制作用;当甲苯二胺质量浓度为200~400 mg/L时,RA为75%~95%,COD去除率与对照组相比下降了2~6个百分点,属于轻度抑制;当甲苯二胺质量浓度高于400 mg/L时,RA在70%以下,COD去除率降至85%以下,属于中度抑制;且随着甲苯二胺质量浓度增大,RA减小、COD去除率减小,抑制作用增强。因此,为了防止甲苯二胺对厌氧污泥微生物活性的抑制,甲苯二胺质量浓度应控制在0~150 mg/L。 相似文献
168.
HAO Li-qing WANG Zhen-y FANG Li ZHANG Wei-jun WANG Wei LI Cheng-xiang SHENG Liu-si 《环境科学学报(英文版)》2006,18(5):903-909
Photooxidation reaction of toluene in smog chamber systems was initiated by the UV radiation of tolucne/CH5ONO/NOx mixtures. The products of the photooxidation reaction of toluene and its subsequent reactions were analyzed directly utilizing Fourier transform infrared spectrometer (FTIR). Detailed assignments to FTIR spectrum of gas-phase products were given. The information of some important functional groups in the products, such as, carbonyl groups (C-O), hydroxyl groups (-OH), carboxylic acid (- COOH), C-C bonding, N O bonding and C-H bonding (C H), was got from this analysis. These results were compared to those analyzed by aerosol time of flight mass spectrometer (ATOFMS). It was found that there are some differcnccs between FTIR analysis of gas-phase products and that of particle-phase, for example, the products with carbonyl groups, which were connected to unsaturated chemical bonds, was relatively higher in the gas phase, while kctoncs, aldehydes, carboxylic acid and organonitrates were the dominant functional groups in the aerosol-phase reaction products. The possible reaction pathways of some important products in the gas phase were also discussed. 相似文献
169.
生物膜法净化甲苯二甲苯混合废气的研究 总被引:8,自引:4,他引:4
在生物滴滤器中对低质量浓度甲苯、二甲苯混合废气的净化性能进行试验研究。结果表明:甲苯、二甲苯的净化率均随入口浓度增加而降低,同样条件下二甲苯净化率明显低于甲苯;单负荷进气且气体流量为200L/h时,甲苯最大生化降解量为79.5g/(m3.h),二甲苯最大生化降解量为47.5g/(m3.h);多负荷进气由于竞争抑制作用导致两者净化程度均有所降低。维持甲苯、二甲苯质量浓度不变,两种废气的净化率η均随气量的增加而减少;在气量为260L/h时,两种化合物生化降解量均达到最大值,适宜停留时间为119s。 相似文献
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