| This study focused on the preparation of phosphate functionalized hollow mesoporous silica spheres(PHMS)and their adsorption removal performance of trace amounts of antimony(Ⅲ)from water.The route are as follows: Using large-diameter monodisperse carbon microspheres(CS)synthesised by glucose-oxygen hydrothermal method as the hard template and cetyltrimethylammonium bromide(CTAB)as the soft template to synthesize hollow mesoporous silica spheres(HMSs).On this basis,phosphate groups were grafted by post-grafting method to synthesize phosphonic acid functionized hollow mesoporous silica microspheres(PHMS).The applications of PHMS are: being applied to water treatment of trace contaminated polluted water and exploring its optimal adsorption conditions and adsorption parameters.Phosphonic acid functionalized hollow mesoporous silica composites(PHMS)were prepared in this study and used as a novel adsorbent for adsorption of trace antimony(Ⅲ)from water.The CSs,HMSs,PHMS and PHMS which have reached adsorption equilibrium,were characterized by SEM,TEM,BET,FTIR,particle size distribution,comprehensive thermal analysis,etc.The physicochemical properties were analyzed as well.The effects of solution p H,temperature,adsorbent concentration and treating time on the adsorption of trace ruthenium(Ⅲ)were investigated and a kinetic model for adsorption was established.The synthesized functionalized hollow mesoporous materials have a regular mesoporous structure,monodisperse particle size distribution,and a stable shell-core structure.The CS synthesized in this study with glucose precursors is superior in the uniformity of particle size to sucrose and starch precursors.The addition of ammonia could accelerate the hydrothermal polymerization of carbon microspheres during the hydrothermal reaction.The reducing conditions provided by the hydrothermal heat promoted the carbonization reaction,and increased the average particle size of the carbon microspheres from 395 nm to 11.5μm.The average pore size of the synthesized HMSs is 2.5nm.The hollowness of the hollow spheres can be controlled by adjusting the particle size of the hard template.The content of each component in the reaction system has a great influence on the shell thickness and pore size of the formed HMSs.Infrared spectroscopy showed that on the surface of HMSs,the phosphate groups were highly compatible with the silanol groups.PHMS have high adsorption capacity for Sb(Ⅲ)concentration of 100 μg/L and can be used as an effective adsorbent for trace amounts of antimony(Ⅲ)in water.The max adsorption capacity is 87.46 mg/g,the max removal rate is 87.46 mg/g and the adsorption equilibrium time is 6 h,and the fitting degree of Langmuir equation is 99.961%,indicating that the chemical adsorption is the main adsorption mechanism. |
