酵母基多孔碳珠对染料废水的吸附特性研究

Adsorption characteristics evaluation of yeast-based hollow carbon beads for dye wastewater

以酵母为原料,ZnCl2为活化剂,采用一步热裂解法制备了多孔碳珠,通过静态吸附实验考察多孔碳珠对染料刚果红的吸附性能,测定了溶液初始浓度、碳珠投加量、温度对吸附的影响,探讨了等温吸附模型以及吸附动力学。结果表明,当刚果红溶液的初始浓度为8 mg/L,多孔碳珠的投加量为0.20 g,吸附温度298 K时,刚果红的去除率可达到83%,最大吸附量为1.39 mg/g。酵母基多孔碳珠的吸附行为符合Langmuir模型,相关系数为0.99,且吸附符合准二级方程。

Hollow carbon beads were prepared using a pyrolysis treatment of yeast with ZnCl2. The research investigated the adsorption characteristics of the hollow carbon beads to dye Congo red by static adsorption experiment. The effects of adsorption conditions, including solution initial concentration, dosages of hollow carbon beads and temperature of adsorption were determined. Moreover, the adsorption isotherm model and adsorption kinetics were explored. The results showed that hollow carbon beads were observed to adsorb above 83% Congo red under the tested condition of initial concentration of Congo red solution for 8 rag/L, dosages of hollow carbon beads for 0.20 g and temperature 298 K. The maximum adsorption capacity of hollow carbon beads was found to be 1.39 mg/g. The equilibrium for Congo red .adsorption well fitted to the Langmuir absorption model with the correlation coefficient （R2 ） being 0.99. The adsorption of Congo red could be best described by the pseudo-second-order equation.