微波改性柠檬渣吸附Cu^2+的研究与回归分析

Regression analysis and study on the adsorption of Cu by microwave modifed lemon residue

为了研究柠檬渣微波改性后对Cu^2+的吸附性能。利用紫外光谱(UV)、红外光谱(FT-IR)、差热分析(TG-DTA)和能谱(EDS)对柠檬渣进行表征,并进行回归分析。结果表明:用微波改性后的柠檬渣对Cu^2+的吸附率是预处理后柠檬渣的14.5倍左右,是化学改性后柠檬渣的1.23倍左右;微波产生的内酯基和酸性基团羧基,对Cu^2+的吸附更有利;吸附Cu^2+的柠檬渣较微波后的柠檬渣的最大吸收UV波长发生了蓝移,且振动范围变宽了;吸附Cu^2+后的柠檬渣的TG线有3个失重过程;Cu^2+能被改性柠檬渣有效吸附。相同拟合条件下,柠檬渣吸附Cu^2+后的UV、FT-IR和DTA的出峰位置与峰强的拟合程度变差。

In order to study the adsorption properties of Cu^2+by microwave modified lemon residues,the samples were characterized by UV,FT-IR,TG-DTA,EDS,and regression analysis was used too.The result shown that the adsorption rate of Cu^2+by the lemon residues was 14.5times than by the pretreatment,and 1.23times by chemical modified lemon residues.The lactone groups and the carboxyl groups of the acidic groups produced by the microwave were more favorable for the adsorption of Cu^2+.The maximum absorption UV wavelength of the lemon residues after Cu^2+adsorption was increased than the microwave modified lemon residues,and the vibration range became wider.There were three weight loss processes to the TG line of the lemon residue after Cu^2+adsorption.Cu^2+could be effectively adsorbed by the modified lemon residue.The degree of fitting of the peak position and the peak intensity that the UV,FT-IR and DTA of lemon residues after Cu^2+adsorption was worse.