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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。
With almond as raw material, modified by sodium hydroxide, the modified almond nuclear biosorbent was obtained. The effects of dosage, pH, adsorption time, initial concentration and temperature on the adsorption performance were investigated. The isothermal adsorption characteristics, adsorption kinetics and thermodynamics were systematically studied. The results showed that: the dosage of 8g / L, pH 6.5, modified apricot kernel Ni 2+ has a good adsorption effect, the adsorption equilibrium after 180min. The adsorption process is in accordance with the Langmuir isothermal adsorption model and quasi-second-order kinetic equation. The Gibbs free energy △ G <0 is the spontaneous reaction. In addition, infrared spectroscopy was also used to investigate the changes of chemical functional groups before and after adsorption. Studies have shown that modified almonds can be used to remove Ni 2+ in water, and it is a promising biomaterial for heavy metal wastewater treatment.