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The Newly Molecular-Magnetic "Two-in-One" Models---
“Isotherm Adsorption” can describe the amount of the solute adsorbed by a solid under the fixed temperature and pressure. We draw map by an adsorbed and an equilibrium concentration function, then the map is called “the curve of isotherm adsorption”. “The curve of isotherm adsorption” may have different shape, and that is dependent on the avidity between adsorbent and adsorbate. Hence, “the curve of isotherm adsorption” plays an important role for the research about the behavior of the metal ion in soils. But one curve can only describe the adsorption of one kind of soils to particular metal ion, besides the experiments of isotherm adsorption spend a lot of time. So, the purpose of this study is to figure out an applicative parameter in order to estimate ‘the curve of isotherm adsorption” for different kinds of soils to many kinds of metal ion.
The deprotonation, precipitation, complexation, salvation, diffusion, adsorption and cation-exchange of a metal ion influence the absorbency of a soil to the metal ion itself. By the atomistic point of view, linear atomization energy is a new concept to represent the seven types of reactions that we've talked. The bonding length between metal ion and oxygen of metal monaquocomplexes, the atomization energy of metal ion ( AEcation ) and the atomization energy of metal monaquocomplexes are not only the parameters of linear atomization energy but also the molecular parameters of this study. There are a lot of amorphous oxide iron contained in lateritic soil, and according to the studies of previous clerisies, oxide iron has an important influence on the adsorption of soils. In addition, the magnetic of the soil derive mainly from the oxide iron in the soil. Therefore, this study would like use the magnetic of the soil to show the amount of oxide iron in the soil as well as to be the accessory parameter for the adsorbency of the soil. In this experiment there are eight kinds of soils from different places, which are Chentsoliao (CCe-1, CCe-2, CCe-3), Peishihkeng ( TPs ), Tapumei (CTf-1, CTf-2 ) and Wutso ( TWt-1, TWt-2 ), and there still are five kinds of metal ion, which are Pb, Cd, Cu, Zn and Ni. Forty curves of isotherm adsorption are completed, and their shapes correspond to Freundlich's model of isotherm adsorption. Analyzing the parameters of molecular physics, the magnetic, the basic properties of soils and chemical properties by the multiple - regression - analysis to find out the best model of the parameter which is for estimating the curves of isotherm adsorption that I've mentioned. After regressing stepwise, the new model of molecule and magnetic by RMeO, AEcation, AEcomplex and pH, B.D., MF (in-situ susceptibility) has the best result for estimating the isotherm adsorption of single metal ion from these five kinds of metal ion to the eight different types of soils in this research. There among, in-situ susceptibility, MF, is tested out by the MS2 magnetic susceptibility system, and it is instant and nondestructive. In addition, it can improve effectually the capability of estimation of the model. Besides, the correlation coefficient for 1/n between the predicted value and the observed value is up to 0.951 and the correlation coefficient for KF between the predicted value and the observed value is up to 0.973 in the model.
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