改性油页岩灰吸附Cu^(2+)的研究

Study on Cu^(2+) adsorption of modified oil shale ash

油页岩灰经HNO3和不同浓度NaOH溶液改性处理制备了改性油页岩灰吸附剂,比较了各种改性油页岩灰吸附剂对Cu2+的吸附性能,分别讨论了吸附时间、Cu2+浓度和溶液pH值对吸附性能的影响.结果表明,分别经50%HNO3、20%NaOH溶液处理制备的改性油页岩灰吸附剂对Cu2+具有较好的吸附性能,且以化学吸附作用方式为主.该改性油页岩灰吸附剂对Cu2+的吸附符合Freundlich等温吸附方程.

Modified oil shale ash sorbent was prepared from oil shale ash modified by HNO3 and NaOH solution of different concentrations. The Cu^2＋ adsorption capabilities of different modified oil shale ash sorbent were compared. And then, the effects of adsorption time, Cu^2＋ concentration and pH value on the adsorption capability are discussed. The results show that the modified oil shale ash sorbent prepared by 50% HNO3 and 20% NaOH solution has better adsorption capability to Cu^2＋ , with the mechanism being mostly chemical adsorption. The Cu^2＋ adsorption of modified oil shale ash sorbent obeys the Freundlich isothermal absorption equation.