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排序方式: 共有104条查询结果,搜索用时 156 毫秒
91.
92.
Silva GV Vasconcelos MT Santos AM Fernandes EO 《Environmental science and pollution research international》2003,10(4):209-216
BACKGROUND, AIMS AND SCOPE: The building materials are recognised to be major contributors to indoor air contamination by volatile organic compounds (VOCs). The improvement of the quality of the environment within buildings is a topic of increasing research and public interest. Legislation in preparation by the European Commission may induce, in the near future, European Union Member States to solicit the industries of paints, varnishes and flooring materials for taking measures, in order to reduce the VOC emissions resulting from the use of their products. Therefore, product characterisation and information about the influence of environmental parameters on the VOC emissions are fundamental for providing the basic scientific information required to allow architects, engineers, builders, and building owners to provide a healthy environment for building occupants. On the other hand, the producers of coating building materials require this information to introduce technological alterations, when necessary, in order to improve the ecological quality of their products, and to make them more competitive. Studies of VOC emissions from wet materials, like paints and varnishes, have usually been conducted after applying the material on inert substrates, due to its non-adsorption and non-porosity properties. However, in real indoor environments, these materials are applied on substrates of a different nature. One aim of this work was to study, for the first time, the VOC emissions from a latex paint applied on concrete. The influence of the substrate (uncoated cork parquet, eucalyptus parquet without finishing and pine parquet with finishing) on the emissions of VOC from a water-based varnish was also studied. For comparison purposes, polyester film (an inert substrate) was used for both wet materials. METHODS: The specific emission rates of the major VOCs were monitored for the first 72 h of material exposure in the atmosphere of a standardized test chamber. The air samples were collected on Tenax TA and analysed using thermal desorption online with gas chromatography provided with both mass selective detection and flame ionisation detection. A double exponential model was applied to the VOC concentrations as a function of time to facilitate the interpretation of the results. RESULTS AND DISCUSSION: The varnish, which was introduced in the test chamber 23 h after the application of the last layer of material, emitted mainly glycolethers. Only primary VOCs were emitted, but their concentrations varied markedly with the nature of the substrate. The higher VOC concentrations were observed for the parquets of cork and eucalyptus, which indicated that they have a much higher porosity and, therefore, a higher power of VOC adsorption than the finished pine parquet (and polyester film). The paint was introduced in the chamber just after its application. Only primary VOCs were emitted (esters, phthalates, glycolethers and white spirit) but some compounds, like 2-(2-butoxyethoxy)ethanol and diethylphthalate, were only observed for paint/polyester, which suggested that they were irreversibly adsorbed by the paint/concrete. Compared with the inert substrate, the rate of VOC emissions was lower for concrete in the wet-stage (first hours after the paint application) but slightly higher later (dry-stage) as a consequence of desorption. CONCLUSIONS: As to varnish, the substrates without finishing, like cork and eucalyptus parquets, displayed a higher power of adsorption of VOCs than the pine parquet with finishing, probably because they have a higher porosity. As concerns paint, the total masses of VOCs emitted were lower for concrete than for polyester, indicating that concrete reduces the global VOC emissions from the latex paint. Concrete is seen to have a strong power of adsorption of VOCs. Some compounds, namely 2-(2-butoxyethoxy)ethanol, diethylphthalate and TEXANOL (this partially), were either irreversibly adsorbed by the concrete or desorbed very slowly (at undetected levels). A similar behaviour had not been reported for gypsum board, a paint substrate studied before. RECOMMENDATIONS AND OUTLOOK: The present data suggest that concrete may be a recommendable substrate for paint in an indoor environment. As the nature of the substrate conditions the rate and nature of VOC emissions from wet materials, it must be explicit when emissions from composite materials are reported, in order to allow comparisons and labelling of the product in terms of indoor air quality. 相似文献
93.
铁氧体—高压水解一步除氰,镍的机理研究 总被引:3,自引:0,他引:3
本文研究了在1.013MPa,180℃条件下,废水中CN^-,NH3,Ni^2+并存时,以形成铁氧体同时进行高压水解一步除氰,除镍的反应机理。结果发现,镍铁氧体的形成是由于镍离子取代了Fe3O4中的两价铁的晶格位置形成的,新生太的Fe3O4具有表面吸附作用,但随着反应时间的延长吸附量会有所下降;氰水解是镍形成铁氧体的前提,为含氰、含镍废水在高压水解条件下铁氧体一步法治理奠定了理论基础。 相似文献
94.
通过对炼油污水的油性剖析和主要除油设施的净化效率评价,探讨了除油效率与油特性的关系,对现有除油设施存在的问题进行了分析,并提出对策建议。 相似文献
95.
以硅烷偶联剂为改性剂,通过实验研究了纳米TiO2有机化表面改性的影响因素。结果表明,硅烷偶联剂用量为15%、二氯甲烷作为溶剂、改性时间为2h,改性后的纳米TiO2的表面由亲水性转变为亲油性,并能较好地分散于甲苯中,能满足纳米隔热涂料的制备。 相似文献
96.
康冠军 《石油化工环境保护》2004,27(3):20-25
针对洛阳石化PTA污水处理装置存在的主要问题,通过分析,提出了相应对策,优化了生产操作,提高了装置的处理水平,保证了污水的达标排放。 相似文献
97.
金济川 《石油化工环境保护》1997,(4):1-6
综述了近十年来炼油厂给排水工程的设计概况。论述了逆流式冷却塔、污水处理、给水处理以及建筑给排水及消防的技术发展和新技术的开发及应用;并提出看法和建议。 相似文献
98.
99.
100.
钢渣对酸性含Ni(Ⅱ)废水的吸附-中和作用 总被引:1,自引:0,他引:1
以碱性钢渣为水处理材料,研究了其吸附、中和酸性含Ni(Ⅱ)废水的工艺过程和机理。结果表明:在钢渣粒度小于2 mm、用量10 g/L、温度25℃、搅拌强度100 r/min条件下钢渣与Ni(Ⅱ)浓度200 mg/L、pH值4.8的废水反应8 min,可使废水中Ni(Ⅱ)浓度降低到0.25 mg/L,pH值升高到7.2,达到GB8978-1996《污水综合排放标准》的要求。钢渣对酸性废水中Ni(Ⅱ)的吸附符合Langmuir等温吸附式,其饱和吸附量达37 mg/g,反应包括钢渣中碱性物质的水解、Ni(Ⅱ)生成Ni(OH)2沉淀、生成的Ni(OH)2沉淀吸附于钢渣表面等几个过程。X射线衍射分析证明钢渣表面吸附了Ni(OH)2沉淀物。 相似文献