Production of micro- and mesoporous activated carbon from paper mill sludge I. Effect of zinc chloride activation
Production of micro- and mesoporous activated carbon from paper mill sludge I. Effect of zinc chloride activation
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DOI：
10.1016/s0008-6223(00)00043-9
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发表时间：
2000
期刊：
影响因子：
10.9
通讯作者：
N. Khalili;M. Campbell;G. Sandí;J. Gołaś
中科院分区：
文献类型：
--
作者：
N. Khalili;M. Campbell;G. Sandí;J. Gołaś
以造纸厂污泥为原料，采用改进的炭化方法制备了一系列微孔和介孔活性炭。利用吸附等温线数据和D-R方程、αs图、MP法和BJH法等数学模型对所制炭的表面性质进行表征。表面分析结果表明，造纸厂污泥可以经济、成功地转化为比表面积大于1000 m2/g的微孔和介孔活性炭。通过控制化学活化过程中氯化锌（ZnCl2）的用量，制备出具有规定微孔或介孔结构的活性炭。ZnCl2的添加量对孔隙演化的影响最大。将zncl2与污泥的比例从0.75提高到2.5，导致介孔体积增加600%。zncl2与污泥比小于1和大于1.5分别产生微孔碳和介孔碳。在zncl2与污泥比为3.5的条件下，生产出了以介孔结构为主（80%）的活性炭。计算得到的微孔结构活性炭的D-R微孔体积与α法计算得到的微孔体积吻合较好，而α法计算得到的微孔体积与中孔结构活性炭的D-R计算结果存在明显偏差。
A series of micro- and mesoporous activated carbons were produced from paper mill sludge using a modified carbonization methodology. N2-adsorption isotherm data and mathematical models such as the D–R equation, αs-plot, and MP and BJH methods were used to characterize the surface properties of the produced carbons. Results of the surface analysis showed that paper mill sludge can be economically and successfully converted to micro- and mesoporous activated carbons with surface areas higher than 1000 m2/g. Activated carbons with a prescribed micro- or mesoporous structure were produced by controlling the amount of zinc chloride (ZnCl2) used during chemical activation. Pore evolvement was shown to be most affected by the incremental addition of ZnCl2. Increasing the ZnCl2to sludge ratio from 0.75 to 2.5 resulted in a 600% increase in the mesopore volume. ZnCl2to sludge ratios less than 1 and greater than 1.5 resulted in the production of micro- and mesoporous carbons, respectively. At a ZnCl2to sludge ratio of 3.5, an activated carbon with a predominantly (80%) mesoporous structure was produced. The calculated D–R micropore volumes for activated carbons with the suggested microporous structure were in good agreement with those obtained from the αsmethod, while estimated micropore volumes from the αsmethod deviated markedly from those obtained from the D–R equation for carbons with a predominantly mesoporous structure.