椰壳活性炭的制备及吸附酸性大红GR染料动力学

Preparation of coconut shell-based activated carbon and its kinetics on the adsorption of acidic scarlet GR dye

采用椰壳制备活性炭吸附处理酸性大红GR染料废水。通过单因素和响应面实验确定了椰壳活性炭制备的最优工艺参数:液固比为3.1 mL/g,磷酸质量分数为66%,活化时间为2.5 h,活化温度为602℃,此条件下制备的活性炭对酸性大红GR染料的吸附容量为1 682 mg/g。以Design-expert7.0软件建立的工艺参数模型与实验结果有较好的吻合度。SEM显示,制备的活性炭具有均匀的纳米级微孔结构。制备的活性炭对酸性大红GR染料的吸附行为符合准二级动力学方程。

Coconut shell has been used for the preparation of activated carbon and the adsorption treatment of acidicred GR dye wastewater. By single-factor and response surface experiments, it is ascertained that the optimized tech-nological parameters of the coconut shell-based activated carbon are as follows ： liquid-solid ratio is 3.1 mL/g, phos-phoric acid mass fraction 66%, activation time 2.5 h and activation temperature 602 ℃. Under these conditions, theadsorption capacity of the activated carbon for acidic scarlet GR dye is 1 682 mg/g. The technological parametersmodel set up Design-expert 7.0 software are in good agreement with experimental results. SEM indicates that theprepared activated carbon has uniform nano-microporous structure. The adsorption action of the prepared activatedcarbon for acidic scarlet GR dye complies with pseudo-second order kinetics equation.