Preparation of Modified Soil and Study on Its Adsorption Properties for Hg2+
To cost-effectively remove heavy metal mercury ions from wastewater,modified soil was prepared as an excellent adsorbent for Hg2+.Five acidic activators were used to modify the soil,and it was found that the modified soil after washing with 0.3%HNO3 exhibited superior adsorption performance for Hg2+.The Freundlich equation accurately described the adsorption isotherm of the modified soil for Hg2+.The optimal pH for the adsorption of Hg2+by the modified soil was 9.In kinetic analysis,it was discovered that the pseudo-second-order kinetic equation more closely fit the adsorption process of the modified soil for Hg2+.After conducting desorption regeneration experiments on the modified soil,it was dis-covered that the segmented desorption method using HCl and ethanol achieved the highest adsorption efficiency of 62.79%.
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