Adsorption Research Of Heavy Metal Ion Onto Illite And Ion Imprinting Polymers

With the development of industry, more and more wastewater included heavymetals have severely impair on nature environment and mankind existence, they arewidely exist in the atmosphere, soil, water, sediment, plants and so on. So, it is alwaysone of the most concerning problem that treating heavy metals of wastewatereffectivel. This article studied the removal of heavy metals discharged from thewastewater, the main contents are as follows:The illite was characterized by scanning electron microscope（SEM）, X-ray powderdiffraction（XRD） and Fourier transform infrared（FTIR）. The sorption of Co（II） onillite was investigated by batch technique under ambient conditions. The effect ofcontact time, pH, humic acid, sorbent concentration, ionic strength and temperaturewas examined. The results demonstrate that the sorption data is well described by thepseudo-second-order model and the sorption of Co（II） is strongly dependent on pHand ionic strength. The sorption of Co（II） is dominated by outer-sphere surfacecomplexation and ion exchange at low pH, whereas inner-sphere surfacecomplexation or surface precipitation is the main sorption mechanism at high pH. Thepresence of HA enhances the sorption of on illite obviously at low pH but a negativeeffect is observed at high pH. The Langmuir, Freundlich and D-R models were usedto simulate the sorption isotherms at three different temperatures. The sorption ofCo（II） on illite fit the Langmuir isotherm well. The thermodynamic parameters （ΔG0,ΔH0and ΔS0） calculated from the temperature dependent sorption isotherms indicatethat the sorption process of Co（II） on illite is spontaneous and endothermic.The illite/TiO₂composites are prepared by sol-gel method in this paper. Thesorption and photocatalytic properties of Co（II） on illite/TiO₂were studied as afunction of illumination, pH, concentration and anion under ambient conditions usingbatch technique. The result shows that the composites have good photocatalyticperformance and may have great prospect for the photocatalytic reduction of Cr（IV）in the polluted environment.Based on the theory of molecular imprinting technology, the molecularly imprinted polymer was prepared with bulk polymerization by using Zn（II） as ionic template.The binding characteristics of the imprinted polymer were evaluated by Scatchardanalysis and draw the adsorption kinetics curve. The result shows that Zinc ionimprinted polymer displays a good selectivity for imprinting molecule Zn（Ac）2, andpoor adsorption for the other two molecules. The speed of adsorption of Zn-MIPs tois quick in initial, and then slows down.