活化硅胶对重金属铜的吸附探究

Study on the Adsorption of Activated Silica Gel on Heavy Metal Copper

将硅胶进行活化处理后,将其应用于吸附土壤中的Cu2+,实验研究了p H,硅胶加入量,震荡时间,温度对土壤吸附铜的影响。结果表明,当活化硅胶与土壤的用量比为0.4g∶1.25g、土壤溶液的p H为6,土壤溶液中铜离子的初始浓度为75mg/L,震荡2h,土壤对铜的吸附效果最佳;最大吸附量为3.23mg/g,吸附率在86.25%左右。吸附量随着温度升高而降低,吸附过程为放热过程。

Using activated silica gel for adsorption of Cu2＋ in soil, effects of activated silica gel, pH value, usage, shock time, and reaction temperature on adsorption proper-ties of the Cu2＋ in soil were studied. Research showed that, when the ration of the do-sage activated silica gel to the soil was 0. 4g： 1.25g, and the pH value was 6, initial concentration of Cu2 ＋ was 75mg/L, shock time was 2h, under this condition, the soil had the best adsorption effect. The maximum adsorption capacities for copper were 3.23mg/g, the adsorption ratio was about 86.25 %. The adsorbance properties decreased with the increasing of temperature and the adsorption behaved as an exothermic process.