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改性荔枝皮对水中Pb(Ⅱ)的动态吸附特性

孔郑磊 李晓晨 杨继利 潘新革

孔郑磊, 李晓晨, 杨继利, 潘新革. 改性荔枝皮对水中Pb(Ⅱ)的动态吸附特性[J]. 环境科学研究, 2014, 27(10): 1186-1192.
引用本文: 孔郑磊, 李晓晨, 杨继利, 潘新革. 改性荔枝皮对水中Pb(Ⅱ)的动态吸附特性[J]. 环境科学研究, 2014, 27(10): 1186-1192.
KONG Zheng-lei, LI Xiao-chen, YANG Ji-li, PAN Xin-ge. Biosorption of Pb(Ⅱ) by Modified Lychee Pericarps in Fixed-Bed Columns[J]. Research of Environmental Sciences, 2014, 27(10): 1186-1192.
Citation: KONG Zheng-lei, LI Xiao-chen, YANG Ji-li, PAN Xin-ge. Biosorption of Pb(Ⅱ) by Modified Lychee Pericarps in Fixed-Bed Columns[J]. Research of Environmental Sciences, 2014, 27(10): 1186-1192.

改性荔枝皮对水中Pb(Ⅱ)的动态吸附特性

基金项目: 国家自然科学基金青年项目(51208174)

Biosorption of Pb(Ⅱ) by Modified Lychee Pericarps in Fixed-Bed Columns

  • 摘要: 以改性荔枝皮为吸附剂对Pb(Ⅱ)进行固定床动态吸附试验,考察了填料柱高(3.1、5.2和10.4 cm)、Pb(Ⅱ)溶液进水流速(2、4和6 mL/min)和初始ρ〔Pb(Ⅱ)〕(50、100和200 mg/L)对Pb(Ⅱ)的吸附穿透曲线和传质区长度的影响. 结果表明:降低柱高、增大流速、增大初始ρ〔Pb(Ⅱ)〕均会使穿透时间提前;柱高、流速和初始ρ〔Pb(Ⅱ)〕引起的传质区长度的平均变化率绝对值分别为0.076、0.090和0.004,可见与初始ρ〔Pb(Ⅱ)〕相比,柱高和流速对传质区长度的影响更大. 吸附穿透曲线的试验数据符合Thomas模型的使用条件(R2>0.95),吸附容量实测值(qexp)大于59.1 mg/g,与Thomas模型预测值(qcal)较为接近,说明内部扩散和外部扩散均非该吸附过程的限速步骤. 在仅改变流速或者初始ρ〔Pb(Ⅱ)〕时,穿透时间预测值和实测值间的最大误差分别为7.14%和8.45%,表明可以通过BDST(bed depth service time)模型确定固定床的使用周期.

     

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出版历程
  • 收稿日期:  2013-10-16
  • 修回日期:  2014-02-27
  • 刊出日期:  2014-10-25

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