【摘要】 以硅藻土为基体,Zn₂SiO₄为吸附改性剂,采用溶剂热法制备了Zn₂SiO₄/硅藻土复合材料。通过X射线衍射仪（XRD）、扫描电子显微镜（SEM）、氮气吸附/脱附仪（BET）对样品的物相组成、形貌和表面特性进行表征,测试复合材料对亚甲基蓝的吸附性能,并进行吸附动力学分析。结果表明:复合材料制备最佳条件为m_{（硅藻土）}∶V_{（甲醇溶液）}=1∶1.6,Zn（NO₃）₂负载量为11.24%。该条件下,复合材料的比表面积比未负载的硅藻土提高了4倍,对亚甲基蓝溶液有较好的吸附性能,吸附量为44.74 mg/g。动力学分析表明,复合材料对亚甲基蓝的吸附过程符合准二级动力学模型。更多还原

【Abstract】 Zn₂SiO₄/diatomite composites were prepared by solvent thermal method using purified diatomite as matrix, and Zn₂SiO₄ as adsorption modifier. The phase composition, morphology and surface properties of specimens were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and nitrogen adsorption-desorption（BET）. The adsorption properties of the composite materials on methylene blue were tested and the adsorption kinetic was analyzed. The results show that the better contents of the zinc silicate composite is m_{（diatomite）}∶V_{（methanol solution）}=1∶1.6. The loading of Zn（NO₃）₂ is 11.24%. The specific surface area of the sample increases by 4 times than that of unsupported diatomite, the composite have better adsorption performences of methylene blue solution and adsorbed amount is 44.74 mg/g under this condition. The kinetic analysis shows that the adsorption of methylene blue on composite material is more in line with the pseudo-second order kinetics model.更多还原