微波法制备的煤基活性炭对芘吸附行为的研究

持久性有机污染物多环芳烃(PAHs)由于其难生物降解的特性对环境造成了极大的危害,本研究以新疆丰富的煤炭为原料,采用微波法制备煤基活性炭(CAC),并利用其吸附性能对典型PAHs芘进行吸附去除,研究各因素对吸附的影响。结果表明:随着温度的升高,吸附率和吸附量降低;随着CAC用量的增加,吸附率升高,吸附量降低;随着溶液初始浓度的增加,吸附率降低,吸附量增大,而溶液的初始pH和转速对吸附影响较小;在温度25~55℃之间探讨了其吸附等温线及吸附动力学,Langmuir模型和拟二级动力学模型可很好地描述吸附行为,表明CAC对芘的吸附属单分子层吸附且吸附过程存在化学作用;CAC对芘的吸附量高达88.08 mg/g,具有良好的吸附作用,表明利用CAC可控制PAHs对环境造成的污染。

Adsorption Behavior of Pyrene onto Coal-based Activated Carbon Prepared by Microwave Activation

Polycyclic aromatic hydrocarbons （PAHs） caused great harm to environment due to their stability and difficult degradation by microorganisms.This research takes advantage of abundant coal resource of Xinjiang as raw materials,coal-based activated carbon （CAC） was prepared by microwave activation. Its adsorption performance was used to remove pyrene,and the effects of adsorption conditions on pyrene adsorption were studied. The results suggest that with the increase of temperature, the adsorption rate and amount decreased. The increase of the amount of CAC resulted in the increase in the adsorption rate and decrease in adsorption amount. The adsorption rate decreased and adsorption amount increased as the initial concentration increasing. With the increase of initial pH solution, the adsorption amount changed little.Agitation had little effect on adsorption.The kinetics and thermodynamics of pyrene adsorbed onto CAC from 25 ~C to 55 ~C were investigated.Pyrene adsorption was well described with Langmuir isotherm and pseudo-second-order model.It indicates that the adsorption behavior belongs to monolayer adsorption,and chemical adsorption is existent in adsorption process.CAC was highly effective in adsorbing pyrene, and the maximum adsorption amount was 88.08 mg/g. Making use of CAC to control the PAHs pollution to the environment is a promising.