以蔗渣纤维素、海藻酸钠为三维网络框架,膨润土为吸附功能单元,采用金属离子交联法联合物理包载法制备蔗渣纤维素-海藻酸钙-膨润土多孔微球,研究其对罗丹明B吸附性能,探究其吸附机理。采用扫描电镜(SEM)、X射线衍射(XRD)和热重(TG)等表征手段分别对多孔微球形貌、晶相和热稳定性进行表征。结果表明:在固液比2g/L,染料溶液pH=3,体积为25mL,初始浓度为400mg/L,吸附温度为318K,吸附360min后,吸附量高达87.14mg/g。多孔微球吸附罗丹明B过程符合准二级动力学模型,罗丹明B在多孔微球吸附遵循Langmuir等温线吸附模型。吸附罗丹明B前后,多孔微球为类球形,具有一定孔隙结构;多孔微球中膨润土晶型结构无明显改变,且具有一定热稳定性。
Bagasse cellulose-calcium alginate-bentonite porous microspheres were prepared by metal ion crosslinking method combined with physical encapsulation method,with bagasse cellulose and sodium alginate as the three-dimensional network framework and bentonite as the adsorption functional unit.The adsorption properties of the porous microspheres for Rhodamine B were studied and the adsorption mechanism was explored.The morphology,crystal phase and thermal stability of the porous microspheres were characterized by SEM,XRD and TG,respectively.The results showed that the adsorption capacity was up to 87.14mg/g when the solid-liquid ratio was 2g/L,the dye solution pH was 3,the volume was 25mL,the initial concentration was 400mg/L,the adsorption temperature was 318K,and the adsorption time was 360min.The adsorption process of Rhodamine B by the porous microspheres conformed to the pseudo-second-order kinetic model,and the adsorption of Rhodamine B by the porous microspheres followed the Langmuir isotherm adsorption model.Before and after adsorbing Rhodamine B,the porous microspheres were quasi-spherical shape with a certain pore structure.The crystal structure of bentonite in porous microspheres had no obvious change and had a certain thermal stability.
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基金资助
广西重点研发计划项目(桂科AB21220027);广西高校中青年教师基础能力提升项目(2021KY0773、2022KY0768、2022KY0769和2023KY0797);崇左市科技计划项目资助(崇科攻2022ZC1203、崇科20220608);广西民族师范学院科研资助项目(2020YB011、2021YB036和2021YB038);国家级大学生创新创业训练计划项目(202210604053);广西壮族自治区一流本科专业建设点制药工程资助(3950010507)
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