Modified Leather Collagen Fibers Enrichment Characteristics Of Heavy Metal Ions In Water

Metals which specific gravity larger than 5.0 or equal to 5.0 are heavy metals. Heavy metals can't decomposed by animalcule. On the contrary, organism can enrich them and trasfer them to mental-organic compound wich have more toxicity. Because of that , heavy metals are one of latent contamination. Along with the development of industrial of plating/curry/antisepsis and dye matter, more and more waste water containing heavy metal ion was let out. As result, the health of human being and the security of environment were hi danger. Since 1950's , bone-ache disease appeared in Japan as a wicked result of Cadmium pollution, people paid more attention to the pollution of heavy metals. Scholars made abroad and in-depth research on the chemical characters of heavy metal ion in water. In all those studies , analysis of heavy metal work as basic research.Due to low content of heavy metal ion in water; and complex composing of the water, every group have influence on different checking method. Mass of instrument analysis, such as Emission spectrometry and Polarography, has not enough sensitivity . Even if it could check those low consistence element, basic element did infection on exactitude and precision of the checking method. Therefore enriching the trace heavy metal ion and separating it from basic element are necessary.Leather glue fibril constitute with tissue fibrin, and it occupies 95-'98% in corium fibrin. Glue fibril have a large amount of function groups such as -CONH-/-OH/-COOH/-NH2, and have special solid reticulation framework.. This kind of configuration decides that leather glue fibril can chelated the heavy metal ion in water and then enrich them.In this thesis, the condition of enriching heavy metal in water were found out: pH=6.0 and the velocity of flow V=3ml/min; and 1.0~2.0mol/L HNO3 canwash them out entirely. And the maximum absorption of heavy metals by leather glue fibril were found out, too. Alkali metals and alkaline-earth metals affect little on the process of absorption; NH3 affect the process of absorption in some degree, it depress the absorption by compete with leather glue fibril.From the experimentation, we can drew the conclusion that, leather glue fibril is one kind of good solid sorbent. It could absorb heavy metal ions in water as Cu2+,Cd2+,Co2+,Cr3+,Pb2+,Ni2+. It enriches those ions in large multiple and fast speed, and it can be washed out fast and completly. The leather glue fibril can be made in a cheap and simple way, and it could be used for many times. Besides, leather glue fibril is one kind of green material used in analysis, it could be decomposed easily after it become inefficacy. Based on that, I offer proposals for doing more research on leather glue fibril as one kind of absorption material, and manufacture it in factory.