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通过溶胶凝胶法制备氨基修饰的磁性纳米粒子。以紫外分光光度法为检测手段,采用静态批次实验研究不同实验参数(吸附时间、溶液pH和溶液温度)对铜离子吸附的影响。对铜离子的动力吸附学过程符合准二级动力学模型。准一级动力学模型证明其对铜离子的吸附是一个基于内部粒子扩散的过程。吸附等温线数据既符合Langmuir吸附等温模型又符合Dubinin Radushkevich吸附等温式。随着溶液pH的增加和温度的升高,水中铜离子的去除效率也增加。另外,铜离子在低pH时可以很容易地从吸附材料上面洗脱下来,并且在材料重复使用5次之后,铜离子的回收率仍然保持在90.0%以上。根据吸附活化能和热力学实验结果,可以推断铜离子在吸附剂上的吸附机制是离子交换表面络合。
Preparation of Amino Modified Magnetic Nanoparticles by Sol - Gel Method. Using UV spectrophotometry as the detection method, the effects of different experimental parameters (adsorption time, solution pH and solution temperature) on copper ion adsorption were studied by static batch experiments. The kinetic sorption of copper ions follows the quasi-second order kinetic model. The quasi-first-order kinetic model proves that the adsorption of copper ions is based on the internal particle diffusion process. The adsorption isotherm data is consistent with the Langmuir adsorption isotherm model and with the Dubinin Radushkevich adsorption isotherm. With the increase of solution pH and temperature, the removal efficiency of copper in water also increases. In addition, copper ions elute easily from the adsorbent material at low pH, and copper ion recovery remains above 90.0% after five repeated uses of the material. According to the activation energy of adsorption and thermodynamic experimental results, we can infer that the adsorption mechanism of copper ions on the adsorbent is the ion exchange surface complexation.