Study On The Adsorption Of Talcum Powder To Adsorb The Heavy Iron

Water is vital factor on which human being depend to exist. Water symbolizes the civilization of humans. With the rapid development of economy, the water resource is consumed rapidly. Furthermore, the problem of water pollution has been becoming more and more serious. It is threat to huaman and anmimals health and destroies the stabilization of the whole ecosystem. There aew lots kinds of contaiminations in water, such as Heavy metal, Organic Pollutant , Cyanide , sulpHide et al. Among this, Heavy metals are serious inorganic contamination in water according to its property of poison to huaman and propagation, and they are hardly to deal with. Generally, heavy metals are come from the industry pollution.So, People use many ways to uptake the heavy metals and using natural silicates to solve the pollution have being become more and more popular. At present, people use layer silicates to adsorb the heavy metal from wastewater and found that they have excellent adsorptive performance. Taclum powder is a kind of layer silicate. It has excellent adsorption to deal with lipin, pigment, medicament or other impurity in water. So, I'd like to study the adsorption of talcum to sorb the heavy metals(Cu²⁺,Pb²⁺,Cd²⁺)from water and studied the relationship between experiment factors and adsorbent property. The Langmuir and Freundlich isotherm are used to describe the performance of absorption. In addition, Using the X-Ray diffraction and Fourier transform infrared spectrometry, the adsorbent law and mechanism is studied in the course of adsorption.The experiment results showed that Talcum has good adsorption to sorb heavy metal, such as Cu²⁺,Pb²⁺,Cd²⁺. The adsorption isotherms of Cu²⁺,Pb²⁺,Cd²⁺ fit the Langmuir and Freundlich equation, but fit the Freundlich well. The heavy metals having the same initial dye concentration, the adsorption property of talcum to solve Cu²⁺,Pb²⁺,Cd²⁺ is Pb²⁺> Cu²⁺> Cd²⁺.Talcum amount, initial pH of solution, adsorption time and adsorption temperature are the major factors to effect the adsorption effect of Cu²⁺. When the talcum amout arise from 2g to 10, the adsorption removal rate can be obtained from 45% to 97.5%. and the pH of solution is a major factor. The pH of solution is 3, the removal rate is 59%; while it is 7, the removal rate is 99.87%. and the best temperature is 60⁷0℃。And pH of solution is a major factor to effect the removal rate of Pb²⁺ and Cd²⁺(100mg/L). when the pH of solution is lower than 4, the removal rate of Pb²⁺ is 81%. But the pH is higher than 4, the rate is 98.89%. According to Cd²⁺(10mg/L), when the pH of solution range from 3 to 6, the removal rate of Cd²⁺ range from 22% to 99.97%. While the pH of solution and the adsorption time is major factor to solve the Cd²⁺ which concentration is 10mg/L. pH of solution range from 3 to 7, the removal rate of Cd²⁺ range from 97.2% to 99.96%. And the best adsorption time is 5 hours. Then the removal rate is 99.1%.And the results of XRD and FTIR of the Talcum powder which adsorbs the Cu²⁺ shows that the Talcum powder adsorb heavy meatal ion mainly by means of surface compound adsorption and pHysics adsorption. But the XRD and FTIR can not express the whole adsorption law. So we need to choose another way to study the adsorbent law and mechanism of Talcum.