不同材质、尺寸粉末炭吸附水中五氯酚的特性

Characteristics of pentachlorophenol(PCP) removal from water by powdered activated carbon with different materials and sizes

五氯酚(PCP)是一种广谱杀虫剂,具有毒性,当五氯酚泄漏到饮用水源后需要有效的技术将其去除.为考察新近出现的纳米尺度粉末炭及不同材质粉末炭(PAC)对水溶液中五氯酚的吸附效能,分别研究了粒径为20、60、200 nm 3种橡木粉末炭及0.5、2.0、5.0μm 3种杉木粉末炭对水中五氯酚的吸附特性,研究结果表明五氯酚在两种材质、6种尺寸的粉末炭上的吸附规律均符合Langmuir模型,对于同一种材质的粉末炭,随着颗粒尺寸减小,吸附速度以及吸附容量都增加.但研究也发现微米级尺寸的杉木粉末炭的吸附容量要远远的大于纳米级尺寸的橡木粉末炭,机理分析认为其主要原因是前者颗粒内部存在大量微孔,比后者拥有更大的微孔容积和比表面积.该研究为筛选和评价吸附水中有机污染物的粉末炭效能提供了理论指导.

The substance pentachlorophenol （PCP） is a type of broad-spectrum pesticide, also referred to as a kind of toxic organic pollutant as well. An effective removal method is needed when large amounts of PCP leaks into drinking water systems. In this research, in order to study the characteristics of PCP removal from water by nanoscale powdered activated carbon （PAC） and the PAC made of different materials appearing recently, the ad？sorption efficiency of PCP by oak PAC （20nm, 60nm, 200nm） and Chinese fir PAC （0.5μm, 2.0μm, 5.0μm） were comparatively studied. It was discovered that the absorption laws of PCP absorbed by the two types of PAC （six kinds of size in all） were all in accordance with Langmuir formula. The smaller size PAC has a rapider adsorp？tion rate and larger adsorption capacity. The micron-sized Chinese-fir PAC shows stronger absorption ability than the nanoscale oak PAC. The main reason is that the former had many microporous structures and has larger specific surface area and microspore volume. This research could provide the theoretical guidance for selecting and evalua？ting the PAC which adsorbs organic pollutants in water.