KH-550改性埃洛石对水中铀酰离子吸附性能的研究  

The adsorption of uranyl ion in aqueous solution by halloysite modified KH-550

作　　者：刘晨[1] 陈元涛[1] 张炜[1] 赫文芳 王雲生 余芳[1] 

机构地区：[1]青海师范大学化学化工学院,青海810008

出　　处：《环境科学学报》2017年第1期243-248,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.B070302);青海省自然科学基金(No.2016-ZJ-912)~~

摘　　要：利用硅烷偶联剂KH-550对埃洛石复合材料进行改性,获得了新型材料KH-550改性埃洛石,并对其进行了红外光谱和X-射线衍射图谱的检测,证明硅烷偶联剂成功嫁接在埃洛石上.同时,实验通过静态批式法探究了KH-550改性埃洛石对水中铀酰离子的吸附作用,分析了不同化学条件下,如浓度、p H值和离子强度等对改性埃洛石悬浮液吸附铀酰离子效果的影响.结果表明,KH-550改性埃洛石吸附铀酰离子的最佳埃洛石悬浮液浓度为1.0 mol·L-1,改性埃洛石对铀酰离子的吸附效果随离子强度的增大而减小,最佳p H值在7.5左右.用不同吸附模型对不同温度下的吸附行为进行拟合,发现用Langmuir模型拟合的效果更好(R2=0.998),最大吸附量为147.58 mg·g-1.用Lagrange准一级动力学和准二级动力学模型对吸附行为进行拟合,发现此吸附过程更加符合准二级动力学模型,最佳吸附时间为90 min.The halloysite（ HNTs） were modified with silane coupling agent KH-550 to form a new adsorbent KH-550 halloysite. The modified HNTs were characterized by Fourier Transform infrared spectroscopy（ FT-IR） spectra and X-ray diffraction（ XRD） analysis. The results show that silane coupling agent KH-550 was grafted on the halloysite surface successfully. While the removal of U（ Ⅵ） from aqueous solution by modified halloysite was studied as a function of various solution chemistry conditions such as concentration,p H,and ionic strength by static batch method. The result indicates that 1. 0mol·L-1of KH-550 modified halloysite soliquoid was optimal for adsorption. The effects of p H and ionic strength on the adsorption capacity were also investigated,Results show the adsorption capacity of the modified HNTs decreased significantly with the increase of ionic strength. p H-dependent sorption suggests an optimal p H value of 7.5 for using modified HNTs in the decontamination of U（ Ⅵ） from aqueous solution. The adsorption of U（ Ⅵ） on the modified HNTs is well described with Langmuir model（ R2= 0.998）,and the maximum adsorption capacity of 147.58 mg·g-1of U（ Ⅵ） was achieved.Sorption kinetic curve can be well fitted by the pseudo-second-order model,and the adsorption process reached equilibrium in about 90 min.

关 键 词：铀酰离子 改性埃洛石 吸附 KH-550 

分 类 号：X703[环境科学与工程—环境工程]