AlH_2P_3O_(10)·2H_2 O(Ⅰ)对水中Ni^(2+)的吸附动力学和热力学研究  

Adsorption Kinetics and Thermodynamics of Ni^(2+) by AlH_2P_3O_(10)·2H_2O(Ⅰ)

作　　者：陈东莲[1] 黄润均[1] 梁冬松[1] 黄增尉[2] 马少妹[2] 廖安平[2] 袁爱群[2] 

机构地区：[1]桂林理工大学南宁分校,广西南宁530001 [2]广西民族大学化学与生态工程学院化学与生物转化过程新技术重点实验室,广西南宁530006

出　　处：《安徽农业科学》2011年第11期6629-6631,6687,共4页Journal of Anhui Agricultural Sciences

基　　金：广西高校优秀人才资助项目[桂教人(2009)62号];广西教育厅项目(200911MS99);广西科技厅科技开发项目(桂科能0992028-13;桂科基0991005)

摘　　要：采用静态吸附法研究Al2O3-P2O5-H2O反应体系产物三聚磷酸二氢铝Ⅰ型二水物[AlH2P3O10.2H2O(Ⅰ)]吸附水中Ni2+的动力学和热力学。考察了温度、浓度、粒径、pH和搅拌速度对吸附过程的影响,通过不同温度下的吸附等温热力学性能的变化,计算了吸附焓、吸附熵和自由能。结果表明,在试验范围内,AlH2P3O10.2H2O(Ⅰ)对Ni2+的吸附符合Langmuir吸附等温方程式,过程受颗粒扩散控制,反应级数为1.88,298.15 K时的热力学数据为:Ea=11.561 kJ/mol,ΔH=35.75 kJ/mol,ΔS=190.58 J/(mol.K),ΔG=-21.07 kJ/mol,吸附为自发的吸热过程,其吸附动力学总方程为:1-2/3x-(1-x)2/3=0.36r02C01.88exp(-11 561/RT)。Adsorption kinetics and thermoyynamics of Ni2＋ by aluminum dihydrogen tripolyphosphate（Ⅰ） obtained in the reaction system of Al2O3-P2O5-H2O were studied by static absorption method.Effects of different temperatures,concentrations,particle sizes as well as pH and stirring speeds on absorption were examined,the enthalpy,entropy and Gibbs free energy of adsorption were calculated by the changes of ther-modynamic properties at different temperatures.The results showed that the absorption of Ni2 ＋ by aluminum dihydrogen tripolyphosphate hadbeen found to fit the Langmuir absorption isotherm equation.This absorption was a spontaneous and endothermic process controlled by particlediffusion,the reaction grade was 1.88,the thermodynamics parameters were for 298.15 K： Ea = 11.561 kJ/mol,ΔH = 35.75 kJ/mol,ΔS =190.58 J/（mol.K） and ΔG =-21.07 kJ/mol,the general dynamic equation of the adsorption was 1-2 /3x-（1-x） 2/3 = 0.36r02C01.88exp（-11 561/RT）.

关 键 词：三聚磷酸二氢铝Ⅰ型二水物 NI2+ 热力学 动力学 

分 类 号：X703[环境科学与工程—环境工程]