摘要
以工业粉状废物为主要原料制备出粒径为2～4 mm,孔隙率为45.93%,表观密度为1.37 g/cm3,单颗抗压强度为47.73 N的粒状陶瓷滤料,并在其上负载水合氧化锆以制备吸磷材料,考察其吸磷性能和影响因素。通过SEM、XRD和FT-IR对材料进行分析,以研究其吸磷机制。结果表明:滤料负载水合氧化锆后,质量增加了20.48%,比表面积由7.15 m2/g增大到19.35 m2/g,大孔结构为主的孔隙结构变为以介孔结构为主。吸磷主要通过其表面的羟基和磷酸根之间的离子交换实现。在30℃、pH为7时,其对磷酸根有较好的吸附能力,饱和吸附量为10.79 mg/g。其吸附等温线符合Langmiur吸附模型,吸附动力学符合二级吸附动力学模型。吸附后的滤料可在NaOH中再生,经多次"吸附-解吸"后,其吸附容量一直稳定在0.5 mg/g左右。
The granular porous ceramic filtration media with 2 -4 mm of particle size, 45.93% of porosity, 1.37 g/cm^3 of apparent density and 47. 73 N of single granule compression strength was prepared by industrial powder waste solid, on which the hydrous zirconium oxide was loaded for phosphorus removal from water. The phosphorus adsorption property of the prepared media was investigated. SEM, XRD and FT-IR were used to study the mechanism of phosphorus adsorption. The results show that, after being loaded with hydrous zirconium oxide, the mass increases by 20. 48% and the specific surface increases from 7. 15 to 19. 35 m^2/g. The modification makes the pore structures changing from macropore to mesopore. The phosphorus adsorption process is achieved by the ion exchange between hydroxyl and phosphate groups on the surface of the prepared media. The higher saturation adsorption capacity （ 10. 79 mg/g） is obtained at 30℃ with pH 7. The sorption isotherm and sorption kinetics follow the Langmuir equation and the second-order model, respectively. The filtration media adsorbed phosphorus can be regenerated by NaOH solution, and the adsorption capacity remains at around 0. 5 mg/g by several recycles of sorption-desorption.
出处
《现代化工》
CAS
CSCD
北大核心
2012年第1期61-65,共5页
Modern Chemical Industry
基金
国家自然科学基金重点项目(50578051)
关键词
陶瓷滤料
水合氧化锆
除磷
再生
废水处理
ceramic filtration media
hydrous zirconium oxide
phosphorus removal
regeneration
wastewater treatment
