Studies On The Removal Of Arsenic In Water With Manganese Oxide

The arsenic pollution to the environment, especially the problem of water pollution, has drawn widespread concern of the researchers in environmental science around the world for arsenide’s high toxicity, and its widely use in industry and agriculture production process. While China is one of the countries with most serious arsenic pollution, Hunan, as the famous "home of non-ferrous metals", the arsenic content in the water is heavily exceeding the standard. Since1990s, the water quality in Xiangjiang River is becoming worsen, in which the arsenic pollution is particularly serious with the volume of81.851·a-1, bringing great threat to the safety of drinking water to more than4000people. Therefore, the research on water arsenic removal technology has realistic meaning of the arsenic containing wastewater treatment and water purification. This study uses the easy accessible manganese oxide, iron and other materials to produce manganese dioxide adsorbent with different structure, to characterize the structure characteristics and surface nature by using testing methods such as electron microscope scanning, X ray diffraction analysis and infrared spectrum analysis, removing the arsenic of various forms in water by using the principle of preoxidation and adsorption, discussing and studying the removal effect of arsenic in water with nanometer manganese dioxide in different structure, and determine the potent adsorption materials. It had been proved that nanometer MnO2, in which MnO2, nano films are the best with the maximum adsorption capacity of about30mg/g, is a good adsorption to arsenic, MnO2, nano needle has the advantages of high efficiency of adsorption and separation, while the adsorption capacity compared with nano films is low. Pure MnO2has high arsenic adsorption efficiency in the acidic environment, which limits its practical application. FeOOH/MnO2has high adsorption efficiency under the condition of PH6.0, compared with other adsorbents, the adsorption capacity is low. Therefore, each kind of nano materials has certain advantages, but there also exist some shortcomings, the use of different materials should be chosen according to the actual condition of application.