Research On Adsorption Of Arsenic(Ⅴ) By Fe(Ⅲ)-loaded Chelating Resin

In this paper, Fe(â…¢)-loaded chelating resin was prepared and the research was focused on the adsorption of arsenic(â…¤) by Fe(â…¢)-loaded chelating resin. On the basis of a detail analysis and discussion of the existing methods of arsenic removal, a new method based on the theory of ligand exchange was discussed to remove arsenic. In this experiment, D401 chelating resin was chosen as the arsenic removal material. A kind of new arsenic removal material could be obtained by loading Fe³⁺ on the skeleton material. By the complexation of Fe³⁺ and arsenic, arsenic could be removed from water. Through experiments, the arsenic removal effect of the new arsenic removal material was discussed in detail under different conditions, such as active condition, arsenic removal condition, disturbing condition and eluting condition. A minitype adsorption column was used for technological experiment. The effects of arsenic removal under different velocities of flow and different regenerate times were discussed. The results of the experiments showed that this kind of new arsenic removal material could bring down the arsenic in water from 1mg/L to 0.01 mg/L. The pH value had a little interference for arsenic removal. It is also a highly arsenic selected agent. Other ions in water had little interference to its sound arsenic removal. Its regenerating effects are very ideal. The recycled rate can be up to 94% . Through the discussion of the adsorption of dynamics and mathematic model, it could be known that the adsorption of the arsenic in water with this active D401 chelating resin accorded with the formula of Jiaodao: Aln A / (A-q) -q=--1+0. 54x (the first phase) and q = 9. 47 + 0. 25 1gt(the second phase).The adsorption isotherm for the arsenicin water accorded with the formula of Freundlich q_e = 0.3C_e^0.524. Furthermore, wecalculated the down moving rate of adsorption band, the thickness of adsorption band, the total mass transfer coefficient and the number of transfer units of adsorption column and the dynamic adsorption quantity. The results showed that the effects of the dynamic arsenic removal were very ideal.Study in this paper shows that the prepared Fe(â…¢)-loaded chelating resin has obvious advantages. This kind of adsorption agent has a high arsenic removal capability and high arsenic(â…¤)-selectivity. The pH has little interference on it. Easily to handle and hardly to result in any sequential pollution is its obvious characteristics. It is a kind of prospective adsorption agent for arsenic removal from drinking water and industry waste water.