改性文冠果活性炭吸附Ca^2+的研究  

Study of Ca^2+adsorption by modified Xanthoceras Sorbifolia Bunge activated carbon

作　　者：郝一男[1,2] 王任飞 王喜明 薛振华[1,2] 红岭 HAO Yi-nan;WANG Ren-fei;WANG Xi-ming;XUE Zhen-hua;HONG Ling(College of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization,Hohhot 010018,China;Inner Mongolia Mining Development Co.,Ltd.,Hohhot 010010,China)

机构地区：[1]内蒙古农业大学材料科学与艺术设计学院,内蒙古呼和浩特010018 [2]内蒙古沙生灌木资源纤维化和能源化开发利用重点实验室,内蒙古呼和浩特010018 [3]内蒙古矿业开发有限责任公司,内蒙古呼和浩特010010

出　　处：《应用化工》2020年第11期2765-2769,2773,共6页Applied Chemical Industry

基　　金：内蒙古自然基金项目(2018BS03004);内蒙古自治区科技成果转化专项项目(2019CG018);内蒙古人才开发基金项目。

摘　　要：采用硝酸对文冠果活性炭进行氧化改性,探讨了Ca^2+溶液初始浓度、吸附温度、时间、pH值对Ca^2+吸附的影响。分析了吸附热力学和动力学,初步探讨了吸附机理。实验表明,当Ca2+的初始浓度为500 mg/L,吸附温度为40℃,吸附时间为120 min,pH值为2时,吸附量最大,可达285.9 mg/g。硝酸改性文冠果活性炭吸附Ca2+符合伪二级动力学模型和Langmuir等温线模型,吉布斯自由能ΔG°<0、焓变ΔH°<0、熵变ΔS°<0,表明该吸附是一个自发的放热过程。Xanthoceras Sorbifolia Bunge activated carbon(XSBAC)modified by HNO 3 activation was applied.The adsorption process were carried out including initial concentration Ca^2+,adsorption time,pH and temperature.The thermodynamic and kinetic parameters were analyzed,and the mechanism was discussed preliminarily.The results showed that the maximum adsorption capacity of Ca^2+reached 285.9 mg/g under initial Ca^2+concentration,adsorption temperature,adsorption time and solution pH value of 500 mg/L,40℃,120 min,and 2,respectively.Modeling of adsorption kinetics indicated good agreement of experimental data with the pseudo-second-order kinetic model.Langmuir equilibrium isotherm fitted the experimental data reasonable well.The calculated values of the Gibbs free energy were as follows:ΔG°<0,enthalpy changeΔH°<0,entropy changeΔS°<0 which revealed the adsorption was a spontaneous and exothermic process.

关 键 词：文冠果 活性炭 CA^2+ 吸附 

分 类 号：TQ424.1[化学工程]