Equilibria and dynamics of liquid-phase trinitrotoluene adsorption on granular activated carbon: effect of temperature and pH.
Equilibria and dynamics of liquid-phase trinitrotoluene adsorption on granular activated carbon: effect of temperature and pH.
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DOI：
10.1016/j.jhazmat.2006.06.110
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发表时间：
2007-03
影响因子：
13.6
通讯作者：
Jae‐Wook Lee;T. Yang;W. Shim;T. Kwon;I. Moon
中科院分区：
文献类型：
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作者：
Jae‐Wook Lee;T. Yang;W. Shim;T. Kwon;I. Moon
从废水中去除三硝基甲苯（TNT）的环境法规越来越严格。本研究主要探讨TNT在非均相活性炭上的吸附平衡、吸附动力学及吸附柱动力学。用Langmuir方程对温度（298.15、313.15和323.15K）和pH（3、8和10）下的吸附平衡数据进行了关联。此外，采用广义非线性正则化方法计算了描述多孔固体吸附剂非均相特性的吸附能分布函数。研究了活化柱在不同操作条件下的吸附穿透曲线，如温度、pH、浓度、流速和柱长。我们发现，吸附穿透曲线上的pH值的影响是相当高的比其他操作条件。采用表面扩散模型的活性炭颗粒内的吸附模型。采用正交配置法对模型方程进行数值求解，成功地模拟了吸附穿透曲线。
Environmental regulations for removal of trinitrotoluene (TNT) from wastewater have steadily become more stringent. This study focuses on the adsorption equilibrium, kinetics, and column dynamics of TNT on heterogeneous activated carbon. Adsorption equilibrium data obtained in terms of temperature (298.15, 313.15 and 323.15K) and pH (3, 8 and 10) were correlated by the Langmuir equation. In addition, the adsorption energy distribution functions which describe heterogeneous characteristics of porous solid sorbents were calculated by using the generalized nonlinear regularization method. Adsorption breakthrough curves were studied in activated column under various operating conditions such as temperature, pH, concentration, flow rate, and column length. We found that the effect of pH on adsorption breakthrough curves was considerably higher than other operating conditions. An adsorption model was formulated by employing the surface diffusion model inside the activated carbon particles. The model equation that was solved numerically by an orthogonal collocation method successfully simulated the adsorption breakthrough curves.