共查询到19条相似文献,搜索用时 93 毫秒
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含氟废水的处理研究 总被引:2,自引:0,他引:2
成国飞 《中国新技术新产品》2009,(1):7-7
近年来,现代工业的快速发展,特别是电子工业和含氟矿物的开采加工排放的废水含大量氟化物,导致每年的含氟废水排放量急剧增加。氟的大量排放污染环境的同时威胁着人类的健康,因此必须加强对含氟工业废水的处理。 相似文献
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《膜科学与技术》2018,(6)
在玻璃态聚合物中引入立体侧基,能够降低主链堆叠,增加自由体积,提高聚合物的气体渗透性.提出利用立体结构的六氟三苯二胺(BABTFMM),同六氟二酐(6FDA)进行缩聚制备具有高气体渗透性的含氟聚酰亚胺,采用巨正则蒙特卡罗(GCMC)和分子动力学(MD)方法预测了其气体渗透分离性能.分子模拟结果表明,二胺单体中的六氟二甲苯侧基通过空间位阻和主链构型限制,增加了含氟聚酰亚胺的主链间距,降低了堆积密度,增加了自由体积,可以提高含氟聚酰亚胺的气体渗透性.制备了6FDA-BABTFMM和6FDA-ODA两种含氟聚酰亚胺的均质膜进行气体渗透性能测试.结果表明,气体渗透性能测试结果同分子模拟结果一致,6FDA-BABTFMM较6FDA-ODA型聚酰亚胺的渗透性大幅增加,O_2、N_2、CH_4和CO_2渗透速率分别为25.1×10~(-9)、6.8×10~(-9)、5.7×10~(-9)、103.8×10~(-9 )mol/(m~2·s·Pa). 相似文献
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以砖瓦厂含氟废气吸收液为研究对象,用CaO与CaCl2混合钙盐沉淀法处理含氟废气吸收液。通过控制投加Ca的总量,改变CaCl2与CaO的摩尔比,测定去除率和处理后溶液pH,并和模拟含氟废水处理结果进行对比,研究混合钙盐沉淀法处理含氟废气吸收液的可行性。结果表明:模拟吸收液处理实验中,当CaCl2/CaO为1:1时去除率为92.30%,pH为11.85,处理效果较好;砖瓦厂含氟气体吸收液处理实验中,当CaCl2/CaO为7:1时去除率为94.14%,pH为6.48,处理效果较好;混合钙盐处理含氟废气吸收液操作方便,在处理砖瓦厂含氟废气吸收液方面有一定可行性。 相似文献
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Yu. M. Shul'ga V. E. Muradyan V. M. Martynenko B. P. Tarasov N. V. Polyakova 《Fullerenes, Nanotubes and Carbon Nanostructures》2006,14(2):243-247
The mass-spectrometric investigation of the gases evolved from fluorinated multi-walled carbon nanotubes under heating was carried out. It was shown that in temperature interval from 20°C to 120°C the gases are composed predominantly of CO2, CO and H2O. Molecules of COF2 can be finding in gas phase of products of decomposition at 120-300°C. Molecules of CF4 and C2F6 realized from fluorinated nanotubes at 300-450°C. 相似文献
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电真空器件内的残气压强是制管和管子工作过程中管内吸气剂材料吸气后形成的平衡压强,器件击破后质谱分析室本底气体会被吸气剂吸收。因质谱分析室放出的本底气体量一般远小于吸气剂在器件内原吸收的气体量,故器件内的残气压强的新平衡值增量可以忽略,分析室本底不会影响正确的分析结果;大气漏入管内后只表现出该管内惰性气体氩的积累;据此,我们提出了充氩法贮存寿命的快速测试方法。只有吸气剂失效或吸气饱和后管内残气质谱图才反映出漏入的大气成份或分析室本底气体干扰的特征。 相似文献
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V. A. Babain D. N. Bykhovskii K. E. Gil'bo Yu. I. Ibragimov V. F. Saprykin I. V. Smirnov 《Radiochemistry》2003,45(2):135-139
A procedure was proposed for decomposing liquid radioactive organic wastes in low-temperature plasma to form solid inorganic products. Thermolysis of two types of extraction systems with heavy fluorinated diluents, proposed for application in radiochemical industry, was studied. The solid and gaseous thermolysis products were completely analyzed. No fluorine-containing organic compounds were detected in the exhaust gases. To prevent formation of corrosive products, a metal cation was added forming insoluble compounds with the decomposition products. A convenient procedure for simultaneous feeding of organic compound and calcium salt in a methanol solution was proposed. 相似文献
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Tsai WT 《Journal of hazardous materials》2007,139(2):185-192
Hydrofluoropolyethers (HFPEs), a new family of linear oligomeric fluorinated fluids, are being used as potential replacements for halon, hydrochlorofluorocarbons (HCFCs) and perfluorocarbons (PFCs) that have been listed as ozone depleting substances and/or greenhouse gases. Because of their physicochemical properties, these substances may be industrially used as cleaning solvents in the electronic components, fire suppression agents in the fire protection, and heat transfer fluids in the heat exchangers. From the environmental, ecological, and healthy points of view, it is urgent to understand their environmental risks of these HFPEs. This article aimed at introducing these HFPEs in physiochemical properties and potential uses, and evaluating their environmental risks (i.e., global warming, photochemical potential, and environmental partition). Further, the updated data on their toxicological profiles and potential exposure hazards from their degradation products were also addressed in this paper. It is indicated that HFPEs still pose some significant hazards, especially global warming and photochemical potentials, to the atmosphere. Regarding the estimation of partition properties (i.e., vapor pressure, octanol-water partition coefficient and bioconcentration) of HFPEs, the predicted values of logKow for several HFPEs were found to be below zero, suggesting that they should possess very low potential for bioaccumulation in the environment. 相似文献