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81.
Low-temperature VOCs oxidation performance of Pt/zeolites catalysts with hierarchical pore structure
Different zeolites supported Pt catalysts with micro-mesoporous structure were prepared by organic base tetrapropylammonium hydroxide (TPAOH) treatment and their catalytic oxidation activity for various volatile organic compounds (VOCs) were evaluated. The results reveal that the synergistic effect between Pt nanoparticles and surface acid sites plays an important role in VOCs low-temperature removal. The small size and high dispersion of Pt nanoparticles on the surface of the zeolites would promote the catalytic oxidation of aromatics and alkanes over the Pt/zeolite catalysts, while strong acidity and abundant acid sites of catalysts are in favour of the oxidation of the VOCs containing N and O heteroatoms. In addition, it was found that Pt/ZSM-5 catalyst exhibits the highest oxidation activity for various VOCs low-temperature removal amongst all the catalysts due to the balance of both Pt dispersion and abundant acid sites in the catalyst. This comprehensive consideration should be very helpful when designing and preparing novel catalysts for the low-temperature removal of VOCs. 相似文献
82.
Liao Juan Fang Derong Liu Yijun Xiong Shimin Wang Xia Tian Yingkuan Zhang Haonan An Songlin He Caidie Chen Wei Liu Xiang Wu Nian Tian Kunming Wang Linglu Zhang Ya Yuan Hongyu Zhang Li Li Quan Shen Xubo Zhou Yuanzhong 《Environmental science and pollution research international》2022,29(39):58869-58880
Environmental Science and Pollution Research - Reported evidence has increasingly indicated that exposure to phthalates can cause adverse pregnancy outcomes. However, phthalate exposure levels... 相似文献
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84.
外源NO对Cu胁迫下番茄幼苗L-精氨酸代谢的影响 总被引:1,自引:0,他引:1
一氧化氮(nitric oxide,NO)作为生物活性分子,广泛参与各种生物和非生物胁迫。采用营养液培养,研究Cu胁迫下番茄体内L-精氨酸、NO、多胺代谢对外源NO的响应机制,以期为铜污染区域蔬菜种植提供科学依据和技术支持。结果表明,Cu胁迫下添加外源SNP(硝普钠,外源NO供体)能够调节番茄根系和叶片中精氨酸脱羧酶(Arginine Decarboxylase,ADC)、鸟氨酸脱羧酶(Ornithine Decarboxylase,ODC)及一氧化氮合酶(Nitric Oxide Synthase,NOS)活性。根系中,外源SNP能够上调NOS活性,L-精氨酸代谢向着NO合成方向进行;叶片中,外源SNP能够同时上调ADC、ODC、NOS活性,PA、NO的合成同时进行;此外,Cu胁迫下添加外源SNP能够增加根系和叶片L-精氨酸含量,而作为PA、NO的合成前体,精氨酸含量升高无疑会间接促进PA、NO的合成,从而提高番茄对Cu胁迫的抵抗能力。 相似文献
85.
生态-人工渗滤技术在高速公路收费站生活污水处理中的应用 总被引:1,自引:0,他引:1
研究了生态-人工渗滤组合技术在高速公路收费站生活污水中的处理效果。结果表明:在水力负荷为1.5m3/(m2.d),湿干比为1∶3的条件下,系统对COD、SS、NH4+-N、TP均有较好的去除效果,进水中COD、SS、NH4+-N以及TP浓度分别由126~218、123~186、19.89~32.69、2.75~4.53 mg/L降到出水的8~56、7~28、0.45~1.95和0.12~0.40 mg/L,COD、SS去除率分别在80%、85%以上,NH4+-N、TP的去除率均在90%以上。此研究显示,生态-人工渗滤技术在工程应用良好,基建和运行成本较低,在处理远离城市的生活废水时具有巨大的优势。 相似文献
86.
Meng Zhu Yuhuan He Xiaobao Wei Haoran Qi Yunpeng Zhang Yijun Zhang Ruyi Yang Yongming Luo 《Frontiers of Environmental Science & Engineering》2022,16(9):115
87.
88.
The aim of this paper is to compare different end-of-life tire (ELT) treatment technologies in China from an environmental and economic perspective. Four treatment technologies were evaluated: ambient grinding, devulcanization, pyrolysis and illegal tire oil extraction.Life cycle assessment (LCA) was applied to evaluate the potential environmental impact of each treatment based on the Eco-indicator 99 (Hierarchist approach) method provided by GaBi 4 software. The final result shows that pyrolysis represents the environmentally benign option while illegal tire oil extraction caused the worst damages. For the three legal treatments, although high credit was obtained when considering avoided impacts from recycled materials and energy, they have great impact as to respiratory effects (inorganic) dominantly contributed by energy production stage, which implies that the emphasis on environmental policies related to ELT treatment should shift from the control of emissions from treatment process to the reduction of energy consumption.A simplified comparison of net benefits and total impacts shows that the most eco-effective ELT treatment technology is pyrolysis, followed by dynamic devulcanization and ambient grinding. The illegal tire oil extraction, however, must be prohibited immediately because of its highest environmental pollution and lowest net benefit. 相似文献
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90.
在北京北郊铁塔的100m高度释放六氟化硫(SF_6)气体(每小时排放30—40kg),在下风方向3、5km两条弧线上用一辆汽车往返穿行,在车上用塑料针筒取样,然后回到实验室分析浓度。在9、20km弧上和36、50、70km的弧上分别各用一辆汽车装载连续示踪物检测仪穿行,当时在记录器上记录浓度的空间分布。 根据实验资料并配合计算的100、50m和地面的水平轨迹及其它气象资料,分析了风速垂直切变、水平风摆动、大气稳定度和地表特征等因子对扩散的影响。风速垂直切变(特别是地形风和城市热岛引起的风速垂直切变)使浓度水平分布分裂为几段。而在切变较小的稳定和中性条件下,在36km距离的浓度仍呈现典型的正态分布。 计算了水平扩散参数σy,得到城区和郊区的两种稳定度下(中性和稍不稳定)几十公里距离的σy随距离的变化。其规律与用平衡球定位方法所得到的结果接近,并与国外同类实验结果进行了比较。 相似文献