化学改性强化活性炭纤维吸附重金属离子

发布时间：2019-02-15 23:37

【摘要】：为提高活性炭纤维(ACF)对水中重金属离子的吸附性能,采用两种不同改性方法对ACF进行改性处理,比较其对水中Pb(II)、Cu(II)和Co(II)的竞争吸附效能,并对改性前后ACF表面的物理化学特征变化进行分析.结果表明:改性ACF均具有较大的比表面积和孔容积;HNO3及Fe改性后ACF结晶程度较未改性ACF有所降低,且Fe改性ACF具有明显的Fe衍射峰.ACF对重金属离子吸附速率较快,60 min吸附基本达到平衡,HNO3及Fe改性ACF的吸附平衡时间有所增加.初始p H变化直接影响ACF对Pb(II)、Cu(II)和Co(II)的去除效果.3种ACF对重金属离子的亲和力顺序均为Pb(II)Cu(II)Co(II),随着平衡质量浓度的增加,其对Pb(II)和Cu(II)的吸附量增大,而对Co(II)的吸附量呈先增加再下降趋势.Langmuir和Freundlich模型均能较好地描述竞争吸附中Pb(II)和Cu(II)离子的吸附过程,但不能有效模拟Co(II)离子的吸附过程.
[Abstract]:In order to improve the adsorption performance of activated carbon fiber (ACF) for heavy metal ions in water, two different modification methods were used to modify ACF and compare its competitive adsorption efficiency for Pb (II), Cu (II) and Co (II) in water. The physical and chemical characteristics of ACF surface before and after modification were analyzed. The results showed that the modified ACF had large specific surface area and pore volume. The degree of crystallization of ACF modified by HNO3 and Fe was lower than that of unmodified ACF, and the Fe modified ACF had obvious Fe diffraction peak. The adsorption rate of heavy metal ions by ACF was faster, and the adsorption of 60 min reached equilibrium. The adsorption equilibrium time of HNO3 and Fe modified ACF was increased. The change of initial pH has a direct effect on the removal of Pb (II), Cu (II) and Co (II) by ACF. The order of affinity of the three ACF to heavy metal ions is Pb (II) Cu (II) Co (II), with the increase of equilibrium mass concentration. The adsorption amount of Pb (II) and Cu (II) increased, while the adsorption of Co (II) increased first and then decreased. Both Langmuir and Freundlich models can describe the adsorption process of Pb (II) and Cu (II) ions in competitive adsorption. However, the adsorption process of Co (II) ions can not be effectively simulated.
【作者单位】：解放军后勤工程学院国防建筑规划与环境工程系;哈尔滨工业大学市政环境工程学院;中国人民解放军69330部队;
【基金】：国家自然科学基金(51508564) 重庆市前沿与应用基础研究计划(cstc2015jcyj A20024)
【分类号】：X703;TQ424.1

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