摘要
以废弃杨树叶粉为原料,用微分脉冲伏安法测定了废弃杨树叶粉吸附水溶液中的铜离子。建立了微分脉冲伏安法测定铜离子的方法,在2.5×10^(-4)~2.5×10^(-7) mol/L范围内测定铜离子,检测限为2.51×0^(-8) mol/L,并用于铜离子在废弃杨树叶粉上吸附的研究,考察了铜离子浓度范围、吸附时间、温度、杨树叶粉用量对杨树叶粉吸附铜离子的影响。在40 mL含有铜离子(2.5×10^(-4) mol/L)的KCl(0.025mol/L)溶液中,0.1g杨树叶粉足以吸附99%的铜离子,0.3g的杨树叶粉吸附达到完全,表观一级吸附速率为0.004 37s^(-1),5min可近于吸附平衡。吸附不遵从Temkin等温吸附模型,升高温度不利于吸附过程。最大吸附量为63.48mg/g,可以用于自然pH值下污染水中铜离子的吸附去除。
The adsorption of copper(Cu)ion from aqueous solution with waste poplar leaves powder as an effective bioadsorption material was studied by differential pulse voltammetry(DPV).The limit of detection was found 2.5×10-8 mol/L for Cu ion solution in the concentration range of 2.5×10-4~2.5×10-7 mol/L in 0.025 mol/L KCl solution.The effects of temperature,adsorption time,and the amount of poplar leaf powder on the adsorption of Cu ion were investigated.In 40 mL of 0.025 mol/L KCl solution containing 2.5×10-4 mol/L copper ions,0.1 g of poplar leaf powder adsorbed nearly 99%of Cu ions while 0.3 g of popular leaf powder completely adsorbed Cu ions.With the apparent first order adsorption rate constant of 0.004 37 s-1,equilibrium state was reached in about 5 mins.The adsorption followed Temkin isothermal adsorption model with negative temperature effect.The maximum adsorption capacityis about 63.48 mg/g which may be exploited to remove Cu ions from the pollution water in natural pH condition for adsorption removal treatments.
作者
孙雨佳
吴琼
熊凌燕
李素霞
颜繁颖
朱永春
SUN Yujia;WU Qiong;XIONG Lingyan;LI Suxi;YAN Fanying;ZHU Yongchun(College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang,Liaoning 110034,China;Institute of Catalysis for Energy and Environment,Shenyang Normal University,Shenyang,Liaoning 110034,China)
出处
《中国无机分析化学》
CAS
2018年第1期1-5,共5页
Chinese Journal of Inorganic Analytical Chemistry
基金
国家自然科学基金项目(20875063)资助
关键词
铜离子
杨树叶
微分脉冲伏安法
电化学还原
adsorption
Cu ion
poplar leaves powder
differential pulse voltammetry
electrochemical reduction
