CAJ | 학술논문

通过乳化交联法制备了一种新型的戊二醛交联N,O-羧甲基壳聚糖树脂,用SEM和FT-IR 对树脂的表面结构和化学结构进行表征。用树脂吸附水溶液中的Cu(Ⅱ)、Pb(Ⅱ)和Cd(Ⅱ)等重金属离子,研究了不同pH 值、接触时间和初始浓度对吸附量的影响。当p H 值=5时,树脂对Cu(Ⅱ)的吸附量达到最大值；当p H 值=6时,对Pb(Ⅱ)和Cd(Ⅱ)的吸附量达到最大值。利用两种吸附等温线模型对数据进行拟合并对吸附动力学进行研究,实验数据对 Langmuir 等温线模型具有较高的拟合度,拟合后对 Cu(Ⅱ)、Pb(Ⅱ)和Cd (Ⅱ)的最大吸附量分别为156.25、222.22和178.57mg/g,吸附过程符合拟二级反应动力学模型。
통과유화교련법제비료일충신형적무이철교련N,O-최갑기각취당수지,용SEM화FT-IR 대수지적표면결구화화학결구진행표정。용수지흡부수용액중적Cu(Ⅱ)、Pb(Ⅱ)화Cd(Ⅱ)등중금속리자,연구료불동pH 치、접촉시간화초시농도대흡부량적영향。당p H 치=5시,수지대Cu(Ⅱ)적흡부량체도최대치；당p H 치=6시,대Pb(Ⅱ)화Cd(Ⅱ)적흡부량체도최대치。이용량충흡부등온선모형대수거진행의합병대흡부동역학진행연구,실험수거대 Langmuir 등온선모형구유교고적의합도,의합후대 Cu(Ⅱ)、Pb(Ⅱ)화Cd (Ⅱ)적최대흡부량분별위156.25、222.22화178.57mg/g,흡부과정부합의이급반응동역학모형。
In this study,a novel glutaraldehyde cross-linked N,O-carboxymethyl chitosan resin was prepared by emulsion-chemical method,and the resulting adsorbent was characterized by means of SEM and FT-IR.The use of resin for the removal of Cu(Ⅱ),Pb(Ⅱ)and Cd(Ⅱ)ions from aqueous solution at different initial pH values,contact time,and initial concentrations has been investigated,maximum adsorption of Cu(Ⅱ)ions was observed at pH=5,Pb(Ⅱ)and Cd(Ⅱ)ions was observed at pH=6.The kinetic of the adsorption process was estimated,the result indicated that the adsorption process followed the pseudo-second-order kinetics.Equilibri-um studies showed that the data of Cu(Ⅱ),Pb(Ⅱ)and Cd(Ⅱ)adsorption followed the Langmuir model.The maximum adsorption capacities for Cu(Ⅱ),Pb(Ⅱ)and Cd(Ⅱ)were estimated a saturated capacity of 156.25, 222.22 and 178.57mg/g at optimum pH,which demonstrated the high adsorption efficiency of resin toward the studied metal ions.