Image and Coagulation Behavior of Colloidal Hydrated Manganese Dioxide Flocculate Particles
胶态水合二氧化锰絮凝粒子的结构形貌及其混凝机理

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 m2/g. It belongs to delta-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.