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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.
Using the silane coupling agent KH-550 to modify the halloysite composite material, a new material KH-550 modified halloysite was obtained, and the infrared spectroscopy and X-ray diffraction analysis of the halloysite composite material were performed. The coupling agent was successfully grafted on halloysite.At the same time, the static batch method was used to investigate the adsorption of uranyl ion by KH-550 modified halloysite in water and the effects of different chemical conditions, such as concentration, p H value and Ionic strength, etc. on the adsorption of uranyl ion on the modified halloysite suspension.The results showed that the best halloysite suspension concentration of KH-550 modified halloysite was 1.0 mol·L-1 , The modified halloysite uranyl ion adsorption efficiency decreases with increasing ionic strength, the best p H value of about 7.5 with different adsorption model for different temperature adsorption behavior was found using Langmuir The model fitting effect is better (R2 = 0.998) and the maximum adsorption capacity is 147.58 mg · g-1. The fitting of adsorption behavior by Lagrange quasi-first-order kinetic model and quasi-second-order kinetic model shows that the adsorption process is more In line with the quasi-second-order kinetic model, the optimum adsorption time was 90 min.