采用NaOH溶液对橄榄叶进行改性,制得改性橄榄叶吸附剂,通过FT-IR、SEM、BET对橄榄叶进行表征.以Cu2+为吸附对象,考察了温度、pH值、吸附时间、振荡转速、改性橄榄叶用量、铜离子初始浓度对Cu2+溶液吸附性能的影响.结果表明:在35 ℃、pH=7.00、吸附时间为1h、振荡转速为150 r·min-1条件下,0.2 g的改性橄榄叶(采用0.05 mol·L-1的NaOH溶液改性)对50 mL、30 mg·L-1的Cu2+溶液吸附效果最佳,其吸附率高达97.7%,饱和吸附量q=7.33 mg·g-1.经NaOH改性后的橄榄叶吸附Cu2+为放热反应,吸附等温线符合Langmuir模型,动力学符合准二级模型.
On one hand,modified olive leaf adsorbents were prepared by modification of olive leaves with solution of Sodium hydroxide(NaOH).In the meanwhile,olive leaves were characterized by FT-IR,SEM and BET.On the other hand,taking Cu2+as the adsorption object,the effects of temperature,pH value,adsorption time,oscillation speed,modified olive leaf dosage and initial concentration of copper ions on the adsorption performance of Cu2+solution were investigated.The results are shown as follows:Firstly,under the conditions of 35 ℃,pH=7.00,adsorption time of one hour and oscillation speed of 150 Revolutions per minute(r·min-1),0.2 grams of modified olive leaves(by modification with 0.05 mol· L-1 NaOH solution)had the best adsorption effect for Cu2+solution with 50 mL and 30 mg·L-1,with an adsorption rate of 97.7%and a saturated adsorption capacity q=7.33 mg·g-1.Moreover,the adsorption of Cu2+in olive leaves modified by NaOH was an exothermic reaction.Finally,the adsorption isotherm conformed to the Langmuir equation and the kinetics conformed to the pseudo-second-order kinefics equation.