胶态水合二氧化锰絮凝粒子的结构形貌及其混凝机理  

Image and Coagulation Behavior of Colloidal Hydrated Manganese Dioxide Flocculate Particles

作　　者：杨威[1] 杨艳玲[2] 李星[2] 李圭白[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院 [2]北京工业大学建筑工程学院,北京100022

出　　处：《环境科学》2007年第5期1050-1055,共6页Environmental Science

基　　金：国家自然科学基金项目(50678007);黑龙江省自然科学基金项目(E200510);北京市教委科技发展计划项目(KM200610005020)

摘　　要：采用透射电镜技术观察了胶态水合二氧化锰絮凝粒子的结构形貌并采用Zeta电位测定仪对粒子的荷电特征进行了研究;利用红外光谱、XRD等技术对粒子的界面性质进行了表征;通过混凝试验考察了KMnO4还原法制备的水合二氧化锰胶体对原水的混凝性能并探讨了混凝机理.结果表明,胶态水合二氧化锰粒子在去离子水和原水中荷负电,在去离子水中,粒子直径为10 nm并形成网状结构,有利于发挥吸附架桥作用;粒子具有丰富的表面羟基,比表面积为151.422 m2/g,为-δMnO2,表现出优良的吸附污染物的界面特性;较低投量的胶态水合二氧化锰表现出对原水的优良混凝效能和去除有机微污染的效能.The structure and image of colloidal hydrated manganese dioxide flocculate particles and the electrical charge characteristic of colloidal hydrated manganese dioxide were studied by transmission electron microscope （TEM） and zeta potential （ZP） measurement. The surface chemistry characteristic of colloidal hydrated manganese dioxide was characterized by IR spectra and XRD technology etc. Then the coagulating property and behavior of the colloidal hydrated manganese dioxide produced by KMnO4 were also studied by jar test. The results show that the colloidal hydrated manganese dioxide shows negative electricity in doubly distilled water and raw water. The diameter of the particles is about 10 nm and its flocculate shows network structure which benefits to adsorbing-bridging in doubly distilled water. It has abundant surface hydroxyl radical and its specific surface is 151.422 m^2/g. It belongs to δ-MnO2 . So it exhibits surface chemistry of excellent removal pollutants. It gives best coagulation efficiency and good effect of removal organic pollutants to raw water in a low dosage.

关 键 词：胶态水合二氧化锰 结构形貌 电荷特征 界面性质 混凝 

分 类 号：X703.1[环境科学与工程—环境工程] TU991.2[建筑科学—市政工程]