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141.
We studied the hydrolysis of gas-phase carbon tetrachloride (CCl4), chloroform (CHCl3), and dichloromethane (CH2Cl2) over a metallic Fe surface for its application in combination with air stripping and soil vapour extraction. The effects of chlorocarbon concentration, type and preparation of the iron-containing material, humidity, and temperature on process performance are reported. The hydrolysis of chlorinated methane derivatives is catalysed by metallic iron resulting in a noticeable decrease of the reaction temperature. The reaction kinetics were found to be consistent with the Langmuir-Hinshelwood model. 相似文献
142.
A method for dechlorination of chloroaromatic compounds at room temperature and atmospheric pressure by an in situ generated––in reaction of Al particles with water––or gaseous hydrogen in alkaline media and the presence of Pd/C catalyst was thoroughly investigated, having in mind its possible application in utilization of organochlorine waste. Conversion degree to dechlorinated compounds depended on the constitution of substrates and ranged between 88% and 96% when in situ hydrogen was used (at substrate (chlorine) to catalyst molar ratio 550:1 and over twofold stoichiometric excess of Al relative to substrate (chlorine); the process lasted ca. 26 h until all Al was consumed), or 90–97% if gaseous hydrogen was purged. Effectiveness of dechlorination was markedly affected by stirring, i.e. size of the stirrer and speed of revolution. Prospects for application of the method described were briefly outlined. 相似文献
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144.
《环境科学学报(英文版)》2023,35(2):379-396
Wastewater containing an azo dye Orange G (OG) causes massive environmental pollution, thus it is critical to develop a highly effective, environmental-friendly, and reusable catalyst in peroxymonosulfate (PMS) activation for OG degradation. In this work, we successfully applied a magnetic MnFe2O4/α-MnO2 hybrid fabricated by a simple hydrothermal method for OG removal in water. The characteristics of the hybrid were investigated by X-ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller method, vibrating sample magnetometry, electron paramagnetic resonance, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The effects of operational parameters (i.e., catalytic system, catalytic dose, solution pH, and temperature) were investigated. The results exhibited that 96.8% of OG degradation was obtained with MnFe2O4/α-MnO2(1:9)/PMS system in 30 min regardless of solution pH changes. Furthermore, the possible reaction mechanism of the coupling system was proposed, and the degradation intermediates of OG were identified by mass spectroscopy. The radical quenching experiments and EPR tests demonstrated that SO4• ̶, O2• ̶, and 1O2 were the primary reactive oxygen species responsible for the OG degradation. The hybrid also displayed unusual stability with less than 30% loss in the OG removal after four sequential cycles. Overall, magnetic MnFe2O4/α-MnO2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater. 相似文献
145.
催化氧化—碱渣回流深度处理高浓度染料废水 总被引:1,自引:0,他引:1
在多种酸碱染料废水进行混合、中和的基础上,以铁屑为催化剂,H_2O_2为氧化剂,控制适当的pH,进行催化氧化,破坏染料分子结构,再辅以石灰碱渣回流中和,炉渣过滤,出水中有机质和色度均可大幅度下降,COD_(cr)的去除率>95%,色度去除率>99%。 相似文献
146.
Wei Gao Xiaolong Tang Honghong Yi Shanxue Jiang Qingjun Yu Xizhou Xie Ruijie Zhuang 《环境科学学报(英文版)》2023,35(3):112-134
As the main contributor of the formation of particulate matter as well as ozone, volatile organic compounds(VOCs) greatly affect human health and the environmental quality. Catalytic combustion/oxidation has been viewed as an efficient, economically feasible and environmentally friendly way for the elimination of VOCs. Supported metal catalyst is the preferred type of catalysts applied for VOCs catalytic combustion because of the synergy between active components and support as well as its flexi... 相似文献
147.
齐湘毅 《石油化工环境保护》2006,29(1):41-42,53
天津分公司污水处理场有机废气处理装置,采用“脱硫及总烃浓度均化——催化燃烧”联合处理工艺,废气处理能力为3000Nm^3/h。介绍了采用催化燃烧法处理污水场有机废气的工艺流程,并对装置运行情况进行总结。 相似文献
148.
149.
催化燃烧法处理沥青烟气的研究 总被引:4,自引:0,他引:4
在不同温度、不同沥青烟气与天然气混合比、不同催化剂的条件下,用燃烧法对沥青融化中产生的烟气进行处理,研究其最佳处理效果,降低沥青烟气排放浓度和烟气中有害物质浓度,解决沥青烟气严重污染环境的现状。 相似文献
150.
聚合氯化铝(PAC)对腐殖酸有机溶胶混凝机理的探讨 总被引:4,自引:0,他引:4
采用一定铝总量[Al]T的不同羟铝比(r=[OH]/[Al])的PAC溶液对有机溶胶进行混凝实验.结果表明,聚合氯化铝表面张力(σ)与有机溶胶的COD去除率呈正相关.根据溶液表面张力与溶质水合能力的关系和不同羟铝比的聚合氯化铝中各种羟铝配离子的相对含量,探讨聚合氯化铝对有机溶胶的混凝机理. 相似文献