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| 題 名 | 氯化鋅化學活化製備之麻竹活性碳對水溶液中六價鉻離子之吸附效能=Adsorption Efficiency of Ma Bamboo Activated Carbon Prepared by Chemical Activation of ZnCl₂ for Absorbing Cr(VI) from Aqueous Solution |
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| 作 者 | 劉素玲; 盧崑宗; | 書刊名 | 林產工業 |
| 卷 期 | 37:3 2018.09[民107.09] |
| 頁 次 | 頁165-174 |
| 分類號 | 436.188 |
| 關鍵詞 | 吸附效能; 等溫吸附模式; 氯化鋅化學活化; 六價鉻離子; 麻竹活性碳; Adsorption efficiency; Adsorption isotherm model; Chemical activation of zinc chloride; Hexavalent chromium ion; Ma bamboo activated carbon; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 利用氯化鋅化學活化法,在升溫速率10℃/min,活化溫度500℃之活化條件下,以30、60、90及120min等4種不同持溫時間製備麻竹活性碳作為吸附劑(Adsorbent),探討4種活性碳對水溶液中不同濃度六價鉻(Cr(VI))離子之吸附效能,並以Langmuir與Freundlich等溫吸附模式分析麻竹活性碳對Cr(VI)之吸附行為。界面電位分析結果得知,4種不同持溫時間麻竹活性碳之等電位點為pH=3。以不同pH值金屬溶液吸附水溶液Cr(VI)之試驗結果顯示,4種不同持溫時間麻竹活性碳皆於水溶液pH=4時,可得到最高吸附量,且其吸附機制屬於離子交換與靜電吸引力作用。以氯化鋅化學活化製備之麻竹活性碳,其表面鹼性官能基之含量較酸性官能基高。Langmuir等溫吸附模式之平衡常數與Freundlich等溫吸附模式之經驗常數得知,持溫60、90、120min製備之麻竹活性碳皆有利於吸附Cr(VI),再由決定係數R^2值得知,此3種活性碳之吸附模式較符合Freundlich等溫吸附模式屬多層吸附行為。 |
| 英文摘要 | In this study, the adsorbent of Ma bamboo (Dendrocalamus latiflorus) activated carbons which were prepared by chemical activation of zinc chloride under the conditions of activation temperature of 500°C, heating rate of 10°C/min and with different holding times of 30, 60, 90 and 120 min, respectively. The adsorption efficiency of the adsorbent for absorbing hexavalent chromium ion (Cr(VI)) from aqueous solution as well as its adsorption isotherm models were examined. According to the zeta potential analysis, the isoelectric point of the four kinds of activated carbons with different holding times was at pH3. All four kinds of activated carbons had the highest adsorption amount of Cr(VI) at pH 4 and meantime combined with a higher base functional groups than acid functional groups at the surface of activated carbons. The adsorption mechanism of Ma bamboo activated carbon absorbing Cr(VI) from aqueous solution belong ion exchange and electrostatic interaction. According to the equilibrium parameter of Langmuir and the empirical constant of Freundlich models, the activated carbons with holding time of 60, 90, and 120 min are apt to adsorb Cr(VI) from aqueous solution. Furthermore, by considering the coefficient of determination (R^2), the Freundlich adsorption isotherm model, a multilayer adsorption model, does more conform to the adsorption behavior of the three kinds of activated carbons. |
本系統中英文摘要資訊取自各篇刊載內容。