共沉淀法制备磷酸盐纳米颗粒及其对甲基蓝吸附性能研究

Synthesis of Phosphate Microparticles by Precipitation and Their Applications for Adsorption of Methyl Blue

采用共沉淀方法室温下制备分别含有Ca和Ba的磷酸盐纳米颗粒,并作为吸附剂用于水溶液中甲基蓝染料的去除。实验通过研究不同接触时间和不同初始浓度的甲基蓝溶液对上述两种吸附剂吸附甲基蓝量的影响,对吸附过程进行等温吸附线和吸附动力学分析。结果表明:在20min内,两种吸附剂都达到吸附平衡,而且对甲基蓝的吸附符合准二级动力学方程。磷酸盐对甲基蓝的吸附性能满足Langmuir吸附等温线方程。

Two kinds of phosphate microparticles were synthesized by a simple precipitation method. X-ray diffraction(XRD), and scanning electron microscope(SEM) were used to characterize the samples. The prepared materials were used as absorbents for adsorption of methyl blue. Some influencing factors, including contact time and initial concentration of methyl blue were investigated. The results show that the equilibrium is achieved within 20 min for the two kinds of phosphate microparticles. The experimental data follow the Langmuir isotherm model and the Kinetic results accorded with the pseudo-second-order model.