鸡蛋壳基多孔碳酸钙对刚果红吸附特性研究

Study on adsorption characteristics of multi-pore calcium carbonate made from egg shell powder for Congo red

以废弃物鸡蛋壳为原料,以十二烷基硫酸钠为模板剂,采用模板法制成多孔碳酸钙微粒,并用扫描电镜对其进行表观形貌分析。将多孔碳酸钙微粒应用于刚果红的吸附研究,得出较佳吸附条件为:室温、多孔碳酸钙添加量为0.15 g、质量浓度为300 mg/L的刚果红溶液25 mL、吸附时间为7 h,该条件下的吸附率约为93%。通过吸附等温模型和动力学模型分析,表明多孔碳酸钙对刚果红的吸附属于单分子层吸附,吸附动力学比较符合准二级动力学;红外光谱分析表明多孔碳酸钙对刚果红的吸附主要以物理吸附为主。

By using waste egg shell as raw material and sodium dodecyl sulfate as template,porous calcium carbonate particles were prepared by template method,and their apparent morphology was analyzed by scanning electron microscope.Porous cal-cium carbonate particles were used to study the adsorption of Congo red,the optimal adsorption conditions were as follows:at room temperature,porous calcium carbonate content of 0.15 g,25 mL of Congo red solution with mass concentration of 300 mg/L,adsorption time of 7 h,and under this condition the adsorption rate was about 93%.The adsorption isothermal model and kine-tic model showed that the adsorption of porous calcium carbonate to Congo red belonged to monolayer adsorption,and the ad-sorption kinetics was in line with the quasi-second-order kinetics.Infrared spectrum analysis showed that the adsorption of Congo red by porous calcium carbonate was mainly physical adsorption.