摘要
First, the date palm kernel is used to produce granular activated carbon (GAC) by a physiochemical activation process. The process involves six steps: washing, drying, crushing, sieving, carbonization, and activation. Secondly, the ability of the produced GAC to remove pollutants is examined through batch experiments of residual chlorine adsorption whereas the equilibrium isotherm experimental data are tested for the Langmuir and Freundlich isotherms equations. Thirdly, the experimental and theoretical study of dynamic adsorption process and the effect of major operating parameters on dynamic adsorption are investigated. The results show that the Langmuir isotherm gives the best fitting to experimental data, which indicates that the residual chlorine adsorption can be characterized by mono layer adsorption behavior. The produced GAC has a great potential as an adsorbent for residual chlorine in water systems and it can compete favorably with the conventional adsorbents. The Thomas extended model with combined mass transfer resistances is used for verifying the experimental results and the results show that the proposed model coincides well with the experimental data of the dynamic adsorption process.
采用物化活化工艺,以枣椰仁为原材料制作颗粒活性碳( GAC) ,制作过程主要有 6 个步骤: 清洗,烘干,粉碎,筛分,炭化和活化. 通过小试对新型 GAC 去除余氯的特性进行了研究,并将实验结果与 Langmuir和 Freundlich 等温方程进行了拟合. 通过理论和实验分析,考察了主要运行参数对吸附动力的影响. 结果表明: Langmuir 等温方程与实验数据最为吻合,说明其对余氯吸附为单层吸附. 新型 GAC 在余氯吸附方面具有巨大潜力,比传统的吸附剂更具竞争力. 采用托马斯扩展模型结合物质转移阻力对实验结果进行了验证,模拟结果与实验非常符合.
基金
The National Natural Science Foundation of China(No. 51078074)