摘要
以海藻酸钠(SA)和硅藻土为原料,以丙烯酰胺(AM)和丙烯酸(AA)为单体制备复合凝胶吸附剂,并对其结构和形貌进行分析。以Ni(Ⅱ)、Cd(Ⅱ)为吸附质,探究凝胶吸附动力学行为,考察凝胶投加量、pH值、金属离子的初始质量浓度、盐离子强度等对吸附性能的影响。结果表明:SA/硅藻土-AA-AM复合凝胶是一种表面多孔的吸附材料,其比表面积为22.2484 m^(2)/g,平均孔径为8.6846 nm。复合凝胶对Ni(Ⅱ)、Cd(Ⅱ)具有较快的吸附速率,可在70 min内达到吸附平衡,均符合准二级动力学模型。盐离子对凝胶吸附Ni(Ⅱ)、Cd(Ⅱ)有明显抑制作用,抑制效果为Al^(3+)>Ca^(2+)>Na^(+)。投加量为0.10 g、温度为298 K、pH值为7、金属离子初始质量浓度均为100 mg/L的条件下,吸附剂对Ni(Ⅱ)、Cd(Ⅱ)的去除率分别达到99.40%、96.77%。
The composite gel adsorbent was prepared by using sodium alginate(SA)and diatomite as raw materials,acrylamide(AM)and acrylic acid(AA)as monomers,and its structure and morphology were analyzed.Using Ni(Ⅱ)and Cd(Ⅱ)as adsorbates,the kinetic behavior of gel adsorption was explored.The effects of gel dosage,pH value,initial mass concentration of metal ions and salt ionic strength on the adsorption performance were investigated.The results show that SA/diatomite-AA-AM composite gel is a kind of porous adsorption material with specific surface area of 22.2484 m^(2)/g and average pore size of 8.6846 nm.The composite gel has a fast adsorption rate for Ni(Ⅱ)and Cd(Ⅱ),and can reach adsorption equilibrium within 70 min,which is consistent with the quasi-second-order kinetic model.Salt ions have a significant inhibitory effect on the adsorption of Ni(Ⅱ)and Cd(Ⅱ)by the gel,and the inhibitory effect is Al^(3+)>Ca^(2+)>Na^(+).The removal rates of Ni(Ⅱ)and Cd(Ⅱ)are 99.40%and 96.77%,respectively,when the dosage of adsorbent is 0.10 g,the temperature is 298 K,the pH value is 7,and the initial mass concentration of metal ions is 100 mg/L.
作者
吴淑茗
彭瑞
翁自平
吴佳斌
WU Shu-ming;PENG Rui;WENG Zi-ping;WU Jia-bin(Department of Life Sciences and Chemistry,Minnan Science and Technology University,Quanzhou 362332,China)
出处
《塑料科技》
CAS
北大核心
2023年第4期16-20,共5页
Plastics Science and Technology
基金
福建省中青年教师教育科研项目(JAT200981)
福建省大学生创新创业训练计划(S202012992026)
闽南科技学院教改项目(MKJG-2020-010)
闽南科技学院新工科研究与实践项目(MKXGK-2021-06)。
