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利用红外光谱、扫描电子显微镜、X射线衍射仪等测试技术对脲素和蛋壳制成的碳羟基磷灰石(carbonate hydroxylapatite,CHAP)样品表面化学组成进行了表征,并考察了pH值、吸附时间和苯胺浓度对CHAP吸附水中苯胺的影响,以及其吸附动力学和热力学特征。结果表明:当pH=6,吸附时间为60min,苯胺初始浓度为30mg/L,CHAP对苯胺的吸附效果更好。该过程可用Langmuir Freundlich等温式进行描述,但更符合Freundlich经验公式。分别采用准一级动力学模型和准二级动力学模型考察吸附动力学行为,2个模型与实验数据之间有很好的相关性。吸附热力学行为表明该吸附过程是放热和自发的。
The surface chemical compositions of the carbonate hydroxylapatite (CHAP) samples made of urea and eggshell were characterized by means of infrared spectroscopy, scanning electron microscopy and X-ray diffraction. The effects of pH, The effect of time and aniline concentration on the aniline adsorption in water by CHAP, as well as its adsorption kinetics and thermodynamic characteristics. The results showed that when pH = 6, the adsorption time was 60 min, the initial concentration of aniline was 30 mg / L, and the adsorption of aniline by CHAP was better. This process can be described by the Langmuir Freundlich isotherm but more in line with the Freundlich empirical formula. Adopting quasi-first-order kinetic model and quasi-second-order kinetic model respectively to study the adsorption kinetic behavior. There is a good correlation between the two models and the experimental data. Adsorption thermodynamic behavior indicates that the adsorption process is exothermic and spontaneous.