含铬有序介孔硅对挥发性有机污染物的吸附性能研究

发布时间：2018-01-19 10:04

本文关键词： 介孔材料二氧化硅合成吸附挥发性有机污染物 VOCs 再生节能　出处：《天然气工业》2017年04期 　论文类型：期刊论文

【摘要】：挥发性有机化合物(VOCs)是天然气开采和利用的过程中排放到大气中的主要污染物,需要对其进行处理。吸附法因具有费用低、能耗低、设备灵活等优点,故在实际生产中得到了广泛的应用。然而常用的吸附剂——活性炭和硅基分子筛都存在着易堵塞、有自燃风险、再生困难等明显的缺点,致使其应用受到限制。为此,采用共组装方法合成了一种含铬有序介孔硅材料作为新型吸附剂,并利用小角X射线散射、氮气吸附/脱附、扫描电镜、透射电镜等表征手段,对该新材料的结构进行表征。进而以甲苯、苯、环己烷、乙酸乙酯作为挥发性有机物污染物目标污染物,系统地考察了其对污染物的吸附性能。研究结果表明:①当硅铬比为30时,合成的Cr SBA-15(30)具有最大的微孔孔容;②Cr SBA-15(30)对甲苯、苯、环己烷、乙酸乙酯等4种污染物的吸附性能均良好;③Cr SBA-15(30)的再生比活性炭的再生更加节约能源且操作简单。结论认为:Cr SBA-15(30)在吸附去除VOCs领域具有较为广阔的应用前景。
[Abstract]:Volatile organic compounds (VOCs) are the main pollutants released into the atmosphere during the exploitation and utilization of natural gas, which need to be treated. Because of the advantages of flexible equipment, it has been widely used in practical production. However, the commonly used adsorbents-activated carbon and silicon-based molecular sieves have obvious shortcomings such as easy clogging, spontaneous combustion risk, difficult regeneration and so on. Therefore, an ordered mesoporous silicon containing chromium was synthesized by co-assembly method as a new adsorbent, and small angle X-ray scattering, nitrogen adsorption / desorption, scanning electron microscopy were used. The structure of the new material was characterized by transmission electron microscopy, and toluene, benzene, cyclohexane and ethyl acetate were used as the target pollutants of volatile organic pollutants. The adsorption properties of the synthesized Cr SBA-15 / 30) were investigated systematically. The results show that the synthesized Cr SBA-15 / 30) has the largest micropore volume when the ratio of Si to Cr is 30. 2Cr SBA-15 / 30) has good adsorption properties for toluene, benzene, cyclohexane and ethyl acetate. The regeneration of 3Cr SBA-15 (30) is more energy efficient and easier to operate than that of activated carbon. It has a broad application prospect in the field of adsorption and removal of VOCs.
【作者单位】：同济大学环境科学与工程学院;上海同济科蓝环保设备工程有限公司;
【基金】：污染控制与资源化国家重点实验室自主课题(编号:PCRRK16009)
【分类号】：X74
【正文快照】： 0引言挥发性有机化合物(Volatile Organic Compoun-ds,简称为VOCs)是天然气开采和利用的过程中排放到大气中的主要污染物[1-2]。VOCs在不同地区、行业有多种定义:世界卫生组织(WHO)将VOCs定义为熔点低于室温且沸点介于50~260℃之间的挥发性有机化合物;美国ASTM D3960—98标准

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