改性杏核对水溶液中Ni^(2+)的吸附研究

Study on the adsorption of Ni^(2+) in aqueous solution with modified apricot core

以杏核为原料,经氢氧化钠改性后,得到改性杏核生物吸附剂。考察了投加量、pH、吸附时间、初始浓度和温度对吸附性能的影响,并对等温吸附特征、吸附动力学和热力学进行了系统研究。结果表明:投加量为8g/L,pH为6.5,改性杏核对Ni 2+具有很好的吸附效果,吸附在180min后达到平衡。该吸附过程符合Langmuir等温吸附模型和准二级动力学方程,其反应的吉布斯自由能△G<0,为自发反应过程。此外,还采用红外光谱方法探讨了吸附前后相关化学官能团的变化。研究表明,改性杏核可用于去除水中Ni 2+,而且它是一种很有前景的重金属废水处理生物材料。

Using apricot core as the raw material which was modified by sodium hydroxide,modified apricot core biosorbent was prepared.The influences of dosage,pH,adsorption time,initial concentration and reaction temperature on adsorption properties through single factor tests were investigated.Adsorption isotherm models,thermodynamics models and kinetics models of the adsorption process between modified apricot cote and Ni 2＋were systematically studied.The results showed that the modified apricot core had maximum adsorption efficiencies when the dosage was 8g/L,the pH was6.5.The adsorption reached equilibrium after 180 min.The adsorption process can be fitted very well by Langmuir adsorption isotherms and the quasi-second order kinetics equation.Gibbs free energy was less than zero,which showed that the reaction process was spontaneous.What＇s more,the change of chemical functional groups was examined by IR spectrometry.This study demonstrated that modified apricot core could be used for the removal of Ni 2＋in water treatment.Thus,the modified apricot core was a promising biological material for heavy metal wastewater treatment.