丁二酸酐改性的玉米芯对Cu(Ⅱ)的吸附性能研究  

INVESTIGATION ON THE ADSORPTION PROPERTIES OF Cu(Ⅱ) BY CORNCOB MODIFIED WITH SUCCINIC ANHYDRIDE

作　　者：耿卫东[1] 徐兴志[2] 杨亚玲[2] 

机构地区：[1]昆明市生产力促进中心,云南昆明650021 [2]昆明理工大学生命科学与技术学院,云南昆明650224

出　　处：《水处理技术》2011年第4期37-41,共5页Technology of Water Treatment

基　　金：国家自然科学基金项目资助(50763002)

摘　　要：利用丁二酸酐对微波预处理过的玉米芯进行改性制备新型吸附剂,研究了改性玉米芯(MC)对Cu2+的吸附行为。通过红外光谱FTIR对MC进行结构表征,讨论了MC的用量、pH及吸附时间对Cu2+吸附容量的影响。结果表明,在试验范围内MC的吸附行为更好地符合Freundlich吸附等温线,且随着温度的升高吸附能力增强。在Langmuir吸附等温式中,MC对Cu2+的饱和吸附量为166.67 mg.g-1,是玉米芯的9倍左右。其动力学数据更好地符合二级动力学方程。计算了吸附过程的热力学参数,吸附过程的活化能Ea为12.030 kJ.mol-1,表明吸附水溶液中Cu2+是吸热的化学过程;标准吉布斯自由能ΔG0为-6.618～-7.383 kJ.mol-1,标准焓变ΔH0为4.771 kJ.mol-1,标准熵变ΔS0为38.219 J.K-.1mol-1,说明吸附是一个自发的、吸热的的过程。MC经过改性后含有羧基对Cu2+具有较强的吸附性能,是一种很有潜力的金属离子吸附剂。Corncob modified by succinic anhydride, after microwave pretreatment, was prepared for a novel adsorbent. The adsorption behavior of modified corncob （MC） with Cu2＋ was studied. FTIR was used to investigate the structure of MC. Adsorbent dose, pH and reaction time were discussed on the influence of the adsorption capacity of Cu^2＋. Within the framework of the experiment, the adsorption behavior of MC followed adsorption isotherm of Freundlich, and the adsorption capacity increased when increasing temperature. From the Langmuir isotherm, it can be known that the saturation adsorption capacity of MC reached t 66.67 mg .g^-1, which was 9 times of corncob. The kinetic data showed better agreement with the second-dynamic equation. Thermodynamic parametei-s of the adsorption process were calculated. The activation energy of biosorption （Ea） was determined to be 12.030 k J-mol^-1, suggesting that the adsorption of Cu2＋ was a endothermic reaction; standard gibbs free energy △S^0, change in enthalpy △H^0 and change in entropy △S^0 were calculated as -6.618--7.383 kJ.mol^-1, 4.771 kJ-mol^-1, 38.219 J.K^-1·mol^-1, respectively. Negative AGo values, negative △H^0 values, negative △S^0 values indicated that the adsorption was a spontaneous and endothermic process. After modified, MC containing carboxyl group had a strong adsorption with Cu^2＋, and it was a potential metal ion adsorbent.

关 键 词：玉米芯 丁二酸酐 铜离子 吸附 

分 类 号：TQ424[化学工程]