Zr掺杂介孔硅对亚甲基蓝的选择性吸附性能

Mesoporous silica with worm-like channels was synthesized using hydroxyethyl cellulose as template and sodium metasilicate as silicon source. Adsorbents with different Zr content were prepared by direct synthesis method （named as Zr-HECMS-D）and post-grafting method （named as Zr-HECMS-P）respectively. Selective adsorption performance of each adsorbent for methylene blue in methylene blue/methyl orange mixed solution was evaluated. The results show that the optimum pH value of the adsorption process is 10.Under acidic conditions,Zr-HECMS-D with Zr/Si molar ratio of 0.02 and Zr-HECMS-P with Zr/Si molar ratio of 0.01 have the best selective adsorption performances, and the methylene blue removal efficiency is proportional to the proportion of O in Zr-O-Si on the surface of adsorbents as well. The metal doping amount has little effect on the selectivity under alkaline conditions. The adsorption process is conformed to the pseudo-second-order kinetic model, and the adsorption equilibrium is conformed to the Langmuir adsorption model.
     

改良8字法外固定治疗锁骨骨折的体会

目的 研究锁骨骨折有效外固定方式.方法 对2006年10月至2007年10月47例锁骨骨折病例行闭合复位改良8字法外固定患者的临床资料进行回顾及分析.结果 47例患者4～6周全部愈合.无畸形愈合.无骨不连.结论 改良8字法外固定,比传统8字法更符合锁骨愈合要求.促进骨折的愈合,值得推广.