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131.
S.-Q. Li Q. Yao S.-E. Wen Y. Chi J.-H. Yan 《Journal of the Air & Waste Management Association (1995)》2013,63(9):1315-1326
Abstract Used tires were pyrolyzed in a pilot-scale quasi-inert rotary kiln. Influences of variables, such as time, temperature, and agent flow, on the activation of obtained char were subsequently investigated in a laboratory-scale fixed bed. Meso-porous pores are found to be dominant in the pore structures of raw char. Brunauer-Emmett-Teller (BET) surfaces of activated chars increased linearly with carbon burnoff. The carbon burnoff of tire char achieved by carbon dioxide (CO2) under otherwise identical conditions was on average 75% of that achieved by steam, but their BET surfaces are almost the same. The proper activation greatly improved the aqueous adsorption of raw char, especially for small molecular adsorbates, for example, phenol from 6 to 51 mg/g. With increasing burnoff, phenol adsorption exhibited a first-stage linear increase followed by a rapid drop after 30% burnoff. Similarly, iodine adsorption first increased linearly, but it held as the burnoff exceeded 40%, which implied that the reduction of iodine adsorption due to decreasing micro-pores was partially made up by increasing mesopores. Both raw chars and activated chars showed appreciable adsorption capacity of methylene-blue comparable with that of commercial carbons. Thus, tire-derived activated carbons can be used as an excellent mesoporous adsorbent for larger molecular species. 相似文献
132.
Titanium dioxide films were prepared on glass, indium-tin oxide (ITO) glass and p-type monocrystalline silicon and studied for the photocatalytic degradation of rhodamine B in an aqueous medium. Raman, AFM, and XPS spectroscopic investigations of these films indicated that microstructure of titanium oxide films were greatly affected by the substrate materials. Rutile was confirmed to be easily formed on the surface of ITO glass, and TiO2 tended to grow as closely packed particles that were elongated strips with an average size of 20 nm, and had lovely contrast with the perfectly round particles grown on p-type monocrystalline silicon. Charge transfer between the film and silicon substrate was verified by surface photovoltage spectra. This may be the real reason why the films grown on ITO glass and silicon substrates exhibit higher photocatalytic reactivity than the film on glass substrate. Moreover, the different surface properties also seem to be responsible for the different activity. 相似文献
133.
Yuan Yao Kohji Kakimoto Hiroaki I. Ogawa Yasuhiko Kato Yoshifumi Hanada Ryota Shinohara Eiichi Yoshino 《Chemosphere》1997,35(12):2891-2897
The photodechlorination pathways of 3,3′,4,5,5′-pentachlorobiphenyl (3,3′,4,5,5′-PentaCB) and the related lower polychlorinated biphenyl congeners irradiated at 254 nm in alkaline 2-propanol were elucidated. Steric effect is the most important factor for controlling the dechlorination pattern of these substrates. Electronic effect also influences the photoreactivity of chlorine substituents. 相似文献
134.
指数平滑法是常用的一种时间序列预测方法,但用于环境预测的先例则较少。本文以南通市１９８１－１９９０年工业三废排放量时间序列为例,简要介绍了该法的原理以及平滑计算、建模、预测和精度分析的过程,并对其在环境预测中的应用效果进行了探讨,结果表明,该法与目前环境预测中常用的回归法相比,具有数据来源较易,不需要特殊分布,计算简单,精度较高等明显的优点,充分显示出该法在环境预测中应用的可行性。 相似文献
135.
Journal of Polymers and the Environment - In this study, Polyethyleneimine modified magnetic chitosan (MCS-PEI) was synthesized by grafting polyethyleneimine onto chitosan and adding magnetic Fe3O4... 相似文献
136.
RuO2/La2O3/TiO2悬浮体系中直接耐晒黑G的光催化降解 总被引：2，自引：0，他引：2
钛酸丁酯为前驱体,采用溶胶-凝胶-浸渍法制备RuO2/La2O3/TiO2复合光催化剂,以紫外灯为光源,研究了催化剂组成、煅烧温度、溶液pH值等因素对直接耐晒黑G(DFBG)光催化降解的影响.结果表明掺杂量w(La2O3)1.39%、w(RuO2)0.12%、煅烧温度500℃(2 h)、溶液pH值7.3时,光催化活性最佳.当通气量为200 mL/min,催化剂投加量为150mg时,50 mg/L的DFBG溶液经60 min降解,其降解率近100%.DFBG的光催化降解服从Langmuir-Hinshelwood动力学模型,测得相应的动力学参数k=7.42×10-3mmol/L·min,K=19.54 L/mmol. 相似文献
137.
针对石化废水中不同特征污染物,采用人工分离筛选去除COD和油工程菌6株、硝化工程菌10株(亚硝化细菌5株、硝化细菌5株)构建高效混合菌群,通过臭氧固定化生物活性炭滤池除污染效能中试研究表明,该系统深度处理石化难降解有机废水是可行的,能同时实现去除COD、油类、NH3 N等污染物的功效,对COD、油类、NH3 N和色度的平均去除率分别为73 0%、90 5%、81 2%和90%,相应的出水分别为33 2mg/L、0 4mg/L、4 5mg/L和10倍,各项指标均达到了国家循环冷却水的用水要求,它的推广应用必将带来显著的环境效益、社会效益和经济效益。 相似文献
138.
139.
我区城市污水处理程度探讨 总被引：1，自引：0，他引：1
建立城市污水处理厂处理污水,是城市发展的必然趋势,而处理级别及处理后水的去向及用途是关系到环境保护和资源得到充分利用的关键,针对我区干旱缺水,灌溉农业特征及天然水域的特点,就污水处理级别排水的用途提出一些看法。 相似文献
140.
影响淀山湖水质变化的因素分析 总被引：4，自引：0，他引：4
就１９９６－１９９８年淀册湖全湖水质均值变化情况作了评述,对影响淀山湖水质变化的因素进行了分析和探讨。针对淀山湖水质受到太湖来水水质影响的情况,提出了在今后的工作中进一步加大保护淀册湖水质的建议和措施。 相似文献