Chemical Manganese Dioxide (CMD) was prepared by an alkali-oxidation method. There are several virtues to this environmental friendly and clean process, including the nontoxic and harmless reagents and products, easy operations, no pollutants, easily obtained raw materials and moderate reaction conditions. The synthesized manganese dioxide was characterized by XRD and SEM. The particles were small, consisting primarily of α-MnO2 and γ-MnO2. Experimental results showed that the optimum conditions were: MnSO4?H2O to NaOH ratio, 1.0:2.4; catalyst concentration (catalyst TF-2), 6% of the MnSO4; initial solution pH, 11; reaction time and temperature, 20 min and 80 °C; air flow, 0.20 m3/h; and, agitation rate, 700 r/min. The conversion of MnSO4 can exceed 80% under these optimum conditions.
展开▼
机译:The preparation and the in-vitro pharmacodynamics study of the intracapsular sustained-release preparations for the prevention of posterior capsule opacification
机译:How the Group Leaders of Lesson Preparation Groups Facilitate Group Learning and Reflective Practice in Chinese Public High Schools =中国公立高中的备课组长是如何引领团队学习和反思性实践的?
机译:神父市政厅,宗教自由和天主教传统。真实地狱中的均一教义发展案例,阿巴耶·圣马德琳(Les Barroux),第二版。修订和扩充,1998年,T。I,系统学,第一期:Preparations,LX + 466页。第二期:成果,278页。 T. II,编年史,总理专着:资料来源,第594页。第二期:所附文件,430页。 T. III,按字母顺序,第一期:参考书目,552页。第二期:一般分析索引,540页。