微波加热烟杆制备活性炭处理含铜废水

Removal of Copper from Waster Water with Activated Carbon Prepared from Tobacco Stems by Microwave Heating

采用微波加热氯化锌活化法由烟杆制备活性炭,并研究所制活性炭对水中Cu(II)的吸附性能。探讨了吸附时间、活性炭用量、pH值等条件对Cu(II)去除率的影响及吸附等温线。研究结果表明,所制活性炭对水中Cu(II)有较好的去除效果,饱和吸附量可达7.03 mg/g,最高去除率可达91.64%;pH值是影响Cu(II)去除率的主要因素,在pH值为6.0时去除率最高,pH>6.0会产生Cu(OH)2沉淀,不利于吸附;活性炭投加量为10 g/L时,即可达到最佳吸附效果;本研究所制活性炭具有较高吸附速率,可在30 min内达到吸附平衡。采用Langmuir、Freundlich和Temkin吸附等温式对不同温度下的吸附平衡数据进行了拟合,结果显示Langmuir模型拟合相关性最好。

Adsorption of Cu（Ⅱ） from waster water onto activated carbon prepared from tobacco stems impregnated with zinc chloride by microwave heating was investigated in a batch system. The adsorption isotherms of Cu（Ⅱ） onto activated carbon was studied by considering the effects of various parameters on the removal rate of Cu（Ⅱ）, such as contact time, pH, and the dosage of activated carbon. The experimental result shows that the activated carbon is an efficient adsorbent for removing Cu（Ⅱ） from aqueous solution, the saturated adsor-ption capacity is 7.03mg/g, while the removal ratio is as high as 91.64%. The result shows that copper adsorption was found to be pH-dependent and the optimum initial pH was chosen to be 6.0 because precipitation of copper hydroxide was observed at pH greater than 6.0. Cu（Ⅱ） in waste water adsorbed by activated carbon mainly took place during the first 30 minutes. The optimal adsorbent dosage is 0.5g. Lan-grnuir, Freundlieh, Temkin isotherms were used to fit the equilibrium data at different temperatures and the equilibrium data were found to be well represented by the Langrnuir isotherm equation.