基于正交实验的KOH改性海泡石纤维对亚甲基蓝吸附性能研究  

Methylene blue adsorption properties of sepiolite fiber modified by KOH based on orthogonal experiment

作　　者：梁伟夏[1] 林香凤[2] LIANG Wei-xia;LIN Xiang-feng(School of Medicine and Health,Guangxi Vocational&Technical Institute of Industry,Nanning 530001,China;School of Environment and Resource,Guangxi Normal University,Guilin 541004,China)

机构地区：[1]广西工业职业技术学院,医药健康学院,广西南宁530001 [2]广西师范大学,环境与资源学院,广西桂林541004

出　　处：《化学研究与应用》2023年第5期1162-1169,共8页Chemical Research and Application

基　　金：广西自然科学基金资助项目(2019GXNSFAA185061)资助;广西高校中青年教师科研基础能力提升项目(2021KY1269)资助;广西重点研发计划资助项目(AB20238014)资助。

摘　　要：采用氢氧化钾(KOH)对海泡石纤维进行改性,并设计正交试验对改性工艺进行优化,得出了较优改性条件为:改性温度为50℃、聚乙二醇浓度为5 mg·mL^(-1)、KOH浓度为0.05 mol·L^(-1),改性时间为9 h,得到的KOH/海泡石纤维(简称K/Sep)对染料亚甲基蓝的吸附去除率达到75.51%。表征了材料的结构和形貌。考察了K/Sep投加量、溶液pH值等因素对亚甲基蓝去除率的影响,K/Sep投加量为0.5 g时染料的去除率达到81.78%,pH值为11时去除率为88.73%。通过吸附动力学研究K/Sep对吸附去除亚甲基蓝的行为,结果表明吸附动力学符合准二级动力学模型,颗粒内扩散为速率控制步骤。初步分析吸附机理为静电相互作用。Potassium hydroxide(KOH)was used to modify sepiolite fiber,and orthogonal experiment was designed to optimize the modification process.The optimum conditions of modification as follows:temperature of modification was 50℃,concentration of polyethylene glycol was 5mg·mL^(-1),concentration of KOH was 0.05mol·L^(-1),Time of modification was 9h.The adsorption removal rate of methylene blue by KOH/sepiolite fiber(K/Sep)reached 75.51%.The structure and morphology of the material were characterized.The effects of K/Sep dosage and pH on the removal rate of methylene blue were investigated.The removal rate of dye reached 81.78%when the K/Sep dosage was 0.5g,and the removal rate was 88.73%when the pH was 11.The adsorption kinetics of K/Sep on methylene blue removal was studied.The results showed that the adsorption kinetics conformed to the pseudo-second-order kinetic model,and the intraparticle diffusion was the rate-controlling step for the adsorption of Methylene blue.The preliminary analysis showed that the adsorption mechanism was electrostatic interaction.

关 键 词：海泡石纤维 改性 亚甲基蓝 正交实验 吸附 

分 类 号：O614.4[理学—无机化学]