聚(丙烯酸酸-co-丙烯酰胺)水凝胶对阳离子染料亚甲基蓝和孔雀石绿吸附性能的研究  

Study of Adsorption Performance of Cationic Dyes Methylene Blue and Malachite Green by Poly (Acrylate-co-Acrylamide) Hydrogel

作　　者：刘宛宜[1] 王天野 王铖熠 毕程程 刘淼 于寒[5] LIU Wan-Yi;WANG Tian-Ye;WANG Cheng-Yi;BI Cheng-Cheng;LIU Miao;YU Han(College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China;College of Environmental Science and Engineering, Peking University, Beijing 100871, China;Yanji Customs Inspection and Quarantine Comprehensive Technical Service Center, Yanji 133000, China;Key Laboratory of Groundwater Resource and Environment, Ministry of Education,College of New Energy and Environment, Jilin University, Changchun 130012, China;Faculty of Agronomy, Jilin Agricultural University, Changchun 130118, China)

机构地区：[1]吉林农业大学资源与环境学院,长春130118 [2]北京大学环境科学与工程学院,北京100871 [3]延吉海关检验检疫综合技术服务中心,延吉133000 [4]吉林大学新能源与环境学院,地下水资源与环境教育部重点实验室,长春130012 [5]吉林农业大学农学院,长春130118

出　　处：《分析化学》2019年第11期1785-1793,共9页Chinese Journal of Analytical Chemistry

基　　金：吉林省科学技术厅项目(No.20180520210JH);吉林农业大学科研启动基金(No.201726)资助~~

摘　　要：以丙烯酸(AA)、丙烯酰胺(AM)为单体,过硫酸盐为引发剂,通过正交试验优化实验条件,采用水溶液聚合法制备聚(丙烯酸-co-丙烯酰胺)(P(AA-co-AM))水凝胶。采用红外光谱和扫描电子显微镜对所制备的P(AA-co-AM)水凝胶进行分析,考察了外界环境因素对P(AA-co-AM)水凝胶吸附性能的影响,探讨了P(AA-co-AM)水凝胶对亚甲基蓝(MB)和孔雀石绿(MG)的吸附动力学行为。结果表明,所制备的P(AA-co-AM)水凝胶具有清晰的三维网络结构,能够通过其表面的羧基和氨基残基与MB和MG相互作用。减小P(AA-co-AM)水凝胶的粒径、增大染料溶液的pH值、升高吸附温度均有利于P(AA-co-AM)水凝胶对MG吸附反应的进行;但适当降低吸附温度反而可以提高P(AA-co-AM)水凝胶对MB的吸附效果。P(AA-co-AM)水凝胶对MB和MG的吸附动力学过程符合准二级动力学模型(R 2>0.990)和粒子内扩散模型(R 3>0.804),吸附过程为化学吸附;吸附等温线符合Freundlich吸附等温模型(R F>0.993),通过拟合得到P(AA-co-AM)水凝胶对MB和MG的理论最大吸附量分别为602.7和575.0 mg/g,吸附过程更倾向于不均匀的多分子层吸附。在最优条件下,P(AA-co-AM)水凝胶对MB反复3次的脱附效率分别为78.18%、68.35%和59.34%。By using potassium persulfate as initiator, acrylate (AA) and acrylamide (AM) as monomers, P(AA- co -AM) hydrogel was prepared by aqueous polymerization. The polymerization conditions were optimized by orthogonal test. The P(AA- co -AM) hydrogel was characterized by SEM and FTIR, and the results indicated that the hydrogel had three-dimensional network structure and the carboxyl and acylamino residues could efficiently interact with methylene blue (MB) and malachite green (MG) to form chelates in aqueous solution. The effects of particle size, temperature, pH value and initial concentration of MB and MG on the adsorption performance were investigated. The adsorption isotherm and kinetic behavior of MB and MG on P(AA- co -AM ) hydrogel were discussed. The results showed that the decrease of the particle size of the P(AA- co -AM ) hydrogel, and the increase of pH value of heavy metal ions solution and adsorption temperature could be in favor of the adsorption of MG on P(AA- co -AM) hydrogel, whereas the lower adsorption temperature could positively influence the adsorption of MB. The adsorption kinetic followed the pseudo-second-order kinetic mode ( R 2>0.990) and the intra-particle diffusion mode ( R 3>0.804). The adsorption process was chemisorption. The adsorption isotherm fitted the Freundlich model ( R F>0.993), and the adsorption process was multi-molecular layer adsorption. The maximum adsorption amount of MB and MG on P(AA- co -AM ) hydrogel were 602.7 and 575.0 mg/g , respectively. Under the optimal desorption conditions, the desorption rates of MB from P(AA- co -AM) hydrogel were 78.18%, 68.35% and 59.34% respectively for repeated three desorption cycles.

关 键 词：丙烯酸 丙烯酰胺 水凝胶 亚甲基蓝 孔雀石绿 吸附 

分 类 号：O647.3[理学—物理化学] X703[理学—化学]