Hamadi Nadhem K, Chen Xiao Dong
Department of Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
J Hazard Mater. 2004 Aug 9;112(1-2):133-41. doi: 10.1016/j.jhazmat.2004.04.011.
The removal of pesticide from wastewater under different batch experimental conditions, using a car tire derived activated carbon was investigated. The pesticide utilized in the study was Paraquat dichloride (1,1-dimethyl-4,4-bipyridyl dichloride), which is a well known herbicide. The adsorbent was produced from the pyrolysis and activation of used tires (TAC). The performances of this adsorbent and a commercial activated carbon F300 (CAC) have been compared. It was determined that the adsorption of Paraquat was weakly pH dependent. The effects of particle size, carbon dosage, temperature and the initial concentration of the Paraquat were studied. Further experiments investigating the regeneration capabilities of the tire-supplied carbon were performed. The regenerated carbons that were washed with basic pH solution were found to have the best sorption capacity recovery. It was found that the rate of sorption of Paraquat onto the carbon is very fast with almost 90% of the maximum possible adsorption taking place in the first 5 min. Nevertheless, the batch sorption kinetics was fitted for a first-order reversible reaction, a pseudo-first-order reaction and a pseudo-second-order reaction. The pseudo-second-order chemical reaction model appears to provide the best correlation. The applicability of the Langmuir isotherm for the present system has been evaluated at different temperatures. The isotherms show that the sorption capacity of CAC decreases with temperature and the dominant mechanism of CAC adsorption is physical sorption.
研究了使用汽车轮胎衍生的活性炭在不同间歇实验条件下去除废水中农药的情况。该研究中使用的农药是百草枯二氯化物（1,1 - 二甲基 - 4,4 - 联吡啶二氯化物），它是一种知名的除草剂。吸附剂由废旧轮胎的热解和活化制备而成（TAC）。已将这种吸附剂与商业活性炭F300（CAC）的性能进行了比较。已确定百草枯的吸附对pH的依赖性较弱。研究了粒径、碳用量、温度和百草枯初始浓度的影响。还进行了进一步的实验来研究轮胎提供的碳的再生能力。发现用碱性pH溶液洗涤后的再生碳具有最佳的吸附容量回收率。发现百草枯在碳上的吸附速率非常快，在前5分钟内几乎发生了最大可能吸附量的90%。然而，间歇吸附动力学符合一级可逆反应、准一级反应和准二级反应。准二级化学反应模型似乎提供了最佳的相关性。已在不同温度下评估了Langmuir等温线对本系统的适用性。等温线表明，CAC的吸附容量随温度降低，且CAC吸附的主要机制是物理吸附。
