駱尚廉2006-07-262018-06-282006-07-262018-06-282005-07-31http://ntur.lib.ntu.edu.tw//handle/246246/22158鉻是一般工業上經常使用之原料，故在工業區附近之地下水中，鉻為最常見的污染物之ㄧ。近年來，利用零價鐵現地處理鉻污染的潛力也逐漸被重視。由於零價鐵之比表面積以及鈍化膜為影響其去除效率極為重要的因子，而奈米化後的鐵粉既具備較大的比表面積也具備較薄的鈍化膜，故在應用上遠比商用鐵粉更具率， 因此本研究主要在比較J.T. Baker 牌商業鐵粉和自製奈米級鐵粉對於六價鉻之去除效果。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 ofchromium 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. However, in nanolized iron system, the influences of chloride, sulfate, nitrate and perchloride ions on chromium removal rate were very relatively insignificant. But the existence of phosphate ion can still decrease the chromium removal rate. This above phenomenon and the results of electrochemical analysis indicated the destruction of passive film is the ratedetermining step for chromium removal by zero valent iron in commercial powder iron system but is not in nanolized iron system.application/pdf569960 bytesapplication/pdfzh-TW國立臺灣大學環境工程學研究所六價鉻商業鐵粉奈米鐵粉chromiumcommercial powder ironnanolized ironreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/22158/1/932211E002035.pdf