碳羟磷灰石(CHAP)吸附废水中锰离子的动力学研究

摘要

主要研究了碳羟磷灰石(CHAP)对二价锰离子的吸附性能.从pH、吸附时间及初始Mn2+浓度3方面对吸附能力的影响进行吸附试验.试验结果表明:在常温常压,CHAP吸附Mn2+的最佳pH值为6,最佳吸附时间为60 min,吸附量达到22.44 mg/g.CHAP对Mn2+的吸附过程符合准二级反应动力学模型.CHAP吸附Mn2+的能力随着废水中Mn2+浓度增加而增加,最大的吸附量达24.29 mg/g,CHAP对Mn2+的吸附符合Langmuir吸附等温式.%Sorption potential of Carbonate hydroxylapatite for Mn2+ from synthetic wastewater was explored. The effects of pH, contact time and initial concentration were studied in batch experiments. The maximum uptake of metal ions was obtained at pH 6.0.Sorption equilibrium was established by 60 min. The pseudo-second-order kinetic model provided well correlation( R > 0.99)of the used experimental data. The adsorption of Mn2+ by CHAP increased as the initial Mn + concentration increased. The maximum Mn + adsorbed was found to be 22.44 mg/g. It was found that the sorption of Mn2+ on CHAP was correlated well( R2 = 0.998 5) with the Langmuir equation under the concentration range.