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    Title: 以奈米級鐵鎳雙金屬處理水中硝酸鹽之研究
    Nitrate reduction by nanoscale Fe0/Ni0 bimetallic system
    Authors: 鄭智中
    Chih Chung Cheng
    Contributors: 余光昌
    Keywords: 硝酸鹽
    zero-valent metals
    Date: 2006
    Issue Date: 2008-11-24 17:01:03 (UTC+8)
    Abstract: 硝酸鹽為地下水體中最常見的污染物之一。硝酸鹽過量攝入人體之所以有害,乃因硝酸鹽進入腸道後易被還原為亞硝酸鹽。亞硝酸鹽會引起血紅素中的鐵氧化變性,喪失攜氧能力;另外亞硝酸根離子會與人體消化道中的二級胺形成亞硝胺,其為眾所皆知的誘變劑和致癌劑。對生態系統而言,氮源的增加也是造成水體優氧化的原因之一。
    本研究探討以自行合成之零價奈米級鐵鎳雙金屬(Fe0/ Ni0 )對水體中硝酸鹽之去除效率以及相關動力模式。本研究以批次試驗,針對pH值、不同比例之奈米級零價鐵鎳金屬、硝酸鹽氮起始濃度、溶氧等影響因子對奈米級零價金屬去除硝酸鹽之影響,並據以推算其反應速率常數及半衰期。
    Nitrate is one of main pollutants in the groundwater. Nitrate, indigested by the digested system, may be converted to nitrites, which could switch the iron in hemoglobin from ferrous to ferric state and make it no longer capable of carring oxygen. Nitrites can react with secondary amines to form N-nitrosamines, which are the well-known mutagen and carcinogen. In addition, the increase of nitrogen can enhance the eutrophication of the water body.
    The aim of this study is to realize the removal efficiency and kinetics of nitrates in water treated by nanoscale Fe0/ Ni0. The influences of several factors, including pH, the adding ratio of Fe0 with Ni0, initial nitrate concentration and DO on the reaction of nitrates with nanoscale Fe0/ Ni0 would be operated by batch tests and to find the rate constants and half-life.
    Results show that the removal efficiencies of nitrates in the low pH are all significant by adding no matter nanoscale Fe0, Ni0 or Fe0/ Ni0.
    Comparing the removal efficiency of nitrates by adding nanoscale Fe0, Ni0 or Fe0/ Ni0, it can be found that the adding of bimetallic Fe0/ Ni0 can get the better removal efficiency than nanoscale Fe0 or Ni0. Meanwhile, the higher of the ratio of Fe0 in bimetallic Fe0/ Ni0 can attain the better removal efficiency on nitrates.
    This study is also to compare the removal efficiency of nitrates by adding combinedly or separatedly synthesized nanoscale Fe0/ Ni0. Results show that combinedly synthesized could attain the better removal efficiency on nitrates than separatedly synthesized.
    In addition, DO content in water body can not affect the removal of nanoscale zero-valent metals on nitrates.
    Keywords: bimetallic iron/nickel, nitrate, naoscale iron, nanoscale nickel.
    Relation: 校內馬上公開,校外一年後公開
    Appears in Collections:[Dept. of Environmental Engineering and Science (including master's program)] Dissertations and Theses

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