Experimental Study on Adsorption of Heavy Metals by Montmorillonite in Solution
Heavy metal pollution has long been a global environmental problem and has been particularly concerned by the public,including copper and lead pollution in water.At present,the main technologies for purifying heavy metal ions in water are biological method,chemical precipitation method and ion exchange method,among which adsorption method is considered as one of the most potential heavy metal treatment methods because of its simple operation,wide source of adsorption materials and low operating cost.Montmorillonite(Mt)is one of the main mineral components of bentonite,and the interlayer negative charge is balanced by the alkali metal or alkaline earth metal cation on the mineral surface,giving Montmorillonite(Mt)a very strong cation exchange ability.In this paper,the adsorption properties of montmorillonite(Mt)on simulated wastewater containing copper and lead were studied.The results show that with the extension of reaction time,the adsorption removal of heavy metal ions in simulated wastewater increases rapidly first and then slowly.Under the same conditions,the adsorption effect of montmorillonite(Mt)on simulated wastewater containing copper(Cu)is better than that of simulated wastewater containing lead(Pb),and the adsorption process of Montmorillonite(Mt)on simulated wastewater containing copper(Cu)and lead(Pb)is an exothermic reaction.With the increase of solution pH value,the adsorption and removal rates of copper(Cu)and lead(Pb)in simulated wastewater by montmorillonite(Mt)increased,and the alkaline condition helped to improve the adsorption and removal rates of Montmorillonite(Mt)adsorbents on simulated wastewater containing copper(Cu)and lead(Pb).
montmorilloniteadsorptioncopper(Cu)lead(Pb)heavy metal
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