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標題: 稻桿製成之黑炭對六價鉻之吸附和還原轉化作用
Sorption and reductive transformation of hexavalent chromium by black carbon derived from rice straw
作者: 許乃樺
HSu, Nai-Hua
關鍵字: 黑炭
Black carbon
sorption of Cr(VI)
reduction of Cr(VI)
出版社: 土壤環境科學系所
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摘要: Black carbon (BC) is produced by incomplete combustion of various organic material including fossil fuels and vegetation. In rice paddy soils, the major source of black carbon is burning rice straw. Burning rice straw is a common post-harvest practice of rice production. Because black carbon is resistant to decomposition, a long-term rice production may result in the accumulation of BC in rice paddy soils to a considerable extent with respect to determining the fates of contaminants in soils. In this work, Cr(VI) sorption and reductive transformation on BC derived from rice straw were investigated. Rice straw was burned in the air and the resulting ash was treated with HCl/HF solution to remove soluble salts and silica. Sorption of Cr(VI) on BC was investigated under various pHs, Cr(VI) concentrations and ion strengths. After sorption experiments, the residual sorbents were analyzed by X-ray photoelectron spectroscopy(XPS) and Cr K-edge X-ray absorption near-edge structure (Cr K-edge XANES) to determine the structures of sorbed Cr. The results of Cr K-edge XANES and XPS revealed that Cr(VI) was sorbed and reduced to Cr(III) on BC. Thus, BC derived from rice straw is an effective sorbent and reductant for Cr(VI) and may play an important role in determining the fate of Cr(VI) in soils.
黑炭(black carbon)在環境中主要來自於各種有機物質的不完全燃燒所產生的含碳物質。在水田土壤中,黑炭則來自稻米生產的副產物-稻桿的焚燒。台灣在過去有很長的水稻種植歷史,因此推測水田土壤中應有相當量黑炭的存在,並可能影響污染物在水田土壤中的化學轉換和移動性,因此本研究的目的是探討稻桿衍生之黑炭對六價鉻的吸附和還原轉化作用。稻桿經過燃燒後,所得的灰燼進一步以HCl/HF處理以去除可溶性鹽類和矽,以收集其中的黑炭部份,分析顯示其表面具有酸鹼官能基。在不同的pH、離子強度、鉻濃度等實驗條件下將黑炭與六價鉻溶液反應,並以Cr的X光光電子光譜和X光吸收近邊緣結構分析鉻的結構和氧化還原組態。結果顯示,黑炭除了吸附六價鉻之外,還可進一步將其還原成三價鉻,三價鉻除了在表面形成沉澱外,並有部分被釋放至水溶液中。黑炭對Cr(VI)進行表面吸附,吸附於黑炭表面的Cr(VI)再被黑炭還原成Cr(III)。因此,稻桿衍生之黑炭為有效的吸附劑和還原劑,預期對六價鉻在土壤中的生物有效性和宿命將扮演重要的角色。
其他識別: U0005-2508200811162500
Appears in Collections:土壤環境科學系



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