摘要
铬是一般工业上经常使用的原料,故在工业区附近的地下水中,铬为最常见的污染物之一,近年来,利用零价铁处理铬污染的潜力也逐渐被重视.由于零价铁的比表面积以及钝化膜为影响其去除效率极为重要的因子,而纳米化后的铁粉既具备较大的比表面积也具备较薄的钝化膜,故在应用上远比商用铁粉更有效率,因此本文主要比较J.T.Baker牌商业铁粉和自制纳米级铁粉对于六价铬的去除效果.研究结果显示氯离子和硫酸根能增加商业铁粉对六价铬的去除效果,而硝酸根、高氯酸根及磷酸根则会使商业铁粉去除六价铬的效果变差.
Chromium is a common pollutant in groundwater in industrial region because it is a raw material which is often used by many industries.The potential for using zero valent iron to treat chromium pollution in situ has been concerned in recent years.The surface area and the passivity of the passive film on the iron surface are very important factors for chromium removal by zero valent iron.The surface area for nanolized iron is much larger and the passive film for nanolized iron is much thinner than that for commercial powder iron.Therefore,the chromium removal rate in nanolized iron system should be much higher than that in commercial powder iron system.The efficiencies of chromium removal in nanolized iron and commercial powder iron（J.T.Baker） systems were compared in this work.The results show that the existence of chloride and sulfate ions can increase the rate of chromium removal by zero valent iron in commercial powder iron system.Otherwise existence of the phosphate,perchloride and nitrate ions can reduce the rate of chromium removal by zero valent iron in commercial powder iron system.
出处
《首都师范大学学报（自然科学版）》
2015年第5期53-56,59,共5页
Journal of Capital Normal University：Natural Science Edition
关键词
六价铬
商业铁粉
纳米铁粉
chromium
commercial powder iron
nanolized iron
