The New Method Of Treating Heavy Metal In Water

The water is one of the essential factors for the natural and human survival and development. As the development of the global economy, the demand of water increasing, and on the other hand water environment pollution has become increasingly serious. Originally, people thought that the water is "inexhaustible unlimited", but this view has become a history. At present the lack of water has been considerable. How to use existing water resources to meet today even after the world's survival and development has become a hot issue of worldwide. So it needs that how to conduct a follow-up polluted water purification, so as to achieve the demand of people's production and survival. Heavy metals pollution takes a fairly large proportion on water pollution in the environment. Unlike other types of pollutions, which can be biodegradable and weakened or disappeared in biological chain cycle, heavy metal pollution in the biological chain vulnerable in the enrichment enlarge and exist in the body, and it has a greater the toxicity .heavy metal pollution has made a seriously affect on human health and the survival of the development. At present the main methods of heavy metal ions treatment in water are adsorption, flocculation precipitation, membrane separation technology, biotechnology, organic materials and sulfide precipitation etc. The methods of organic materials and sulfide precipitation have made more and more attention by people .That because it's better choice, the strong handling capacity, simply feasible process, low-cost advantages and can be repeatedly used.The issue makes a brief overview of heavy metal ions in water pollution and treatment, and makes a system summarize on water treatment research work and the future development of the heavy metal pollution at home and abroad. Focused on the modified traditional polyurethane by the synthesized 4,4'- Dihydroxy diphenyl thioether, which is a new type of adsorption materials for heavy metal ions - new sulfide ether polyurethane foam. The main topic of the research is to determine the optimal conditions synthesis of 4,4'- Dihydroxy diphenyl thioether(TDP) ,makes its character by IR and melting point measure. Then mix TDP into the synthesis of the traditional polyurethane foam ,in order to modify the traditional polyurethane foam .and confirmed the best ratio of the various materials in synthesis of PU . Finally gained a sulfide polyurethane foam (SPUF), which is stable on appearance and property. After the token of the product, selected three heavy metal ions (Cu²⁺, Pb²⁺, Cd²⁺) ,made the static and dynamic adsorption tests for the product, and consider the impactions of pH, temperature, time, velocity. Determine the best adsorption conditions of static and dynamic adsorption. And make a functional regeneration after the adsorption of heavy metal ions, and measure adsorption capacity after the elution of the sulfide polyurethane foam, which it can be repeatedly used for the purpose of reach. Though there are many reports on the heavy metal ion adsorption function of the material by modified polyurethane, but it is still rare through TDP. Therefore, this subject has some innovativeness. Through numerous experiments confirmed that the project is feasible, and effective, and it has good prospects for development.