摘要
采用溶剂热法合成了金属有机框架材料UIO-66-NH_(2),与海藻酸钠(SA)混合后滴入氯化钙溶液,制备出UIO-66-NH_(2)@SA复合材料。分别用扫描电镜(SEM)、X射线衍射(XRD)和红外光谱(FTIR)对制备的样品进行了结构表征。探究了不同溶液pH、吸附时间、吸附温度、初始Pb^(2+)浓度、材料投加量、共存阳离子浓度对UIO-66-NH_(2)@SA吸附Pb^(2+)的影响,还通过四次吸附-解吸过程探究了其重复利用性。结果表明,UIO-66-NH_(2)@SA对Pb^(2+)的吸附动力学过程符合准二级动力学模型,等温吸附过程符合Langmuir模型,其对Pb^(2+)的理论最大吸附量为132.46 mg/g,且在四轮吸附-解吸循环后仍有较高的单位吸附量,说明UIO-66-NH_(2)@SA对含铅废水具有良好的吸附效果。
The metal-organic framework material UIO-66-NH_(2) was synthesized by solvothermal method,mixed with sodium alginate(SA)and dropped into calcium chloride solution to prepare UIO-66-NH_(2)@SA compound material.The samples were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and infrared spectroscopy(FTIR).The effects of different solution pH,adsorption time,adsorption temperature,initial Pb^(2+)concentration,material dosage and coexisting cation concentration on UIO-66-NH_(2)@SA adsorption of Pb^(2+)were investigated.It’s reusability was explored through four adsorption-desorption processes.The results show that the adsorption kinetic process conforms to the quasi-second-order kinetic model,and the isothermal adsorption process conforms to the Langmuir model.It’s theoretical maximum adsorption capacity is 132.46 mg/g.After four adsorption-desorption cycles,there is still a high unit adsorption capacity,indicating that UIO-66-NH_(2)@SA has a good adsorption effect on Lead containing wastewater.
作者
李永宽
王曦
王醒
贾楠
李登新
Li Yongkuan;Wang Xi;Wang Xing;Jia Nan;Li Dengxin(Donghua University,College of Environmental Science and Engineering,Shanghai 201620,China)
出处
《广东化工》
CAS
2023年第15期1-4,共4页
Guangdong Chemical Industry
基金
国家自然科学基金钢铁联合基金(U1660107)
中央高校基本科研业务费专项资金资助(2232020A-10)。
关键词
金属有机框架
海藻酸钠
吸附
含铅废水
metal-organic framework
sodium alginate
adsorption
lead containing wastewater
