MXene改性材料的制备及其吸附除Sr2+性能  

Preparation of modified MXene material and its adsorption performance for Sr^(2+)

作　　者：张鹏丽 武莉娅 杨宗政 吴志国 曹井国 ZHANG Pengli;WU Liya;YANG Zongzheng;WU Zhiguo;CAO Jingguo(College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457

出　　处：《复合材料学报》2023年第10期5678-5691,共14页Acta Materiae Compositae Sinica

基　　金：天津市卤水化工与资源生态化利用重点实验室开放基金资助项目(BCERE201902);国家科技重大项目子项目(2017 ZX07107-001);天津市教委科研计划项目(自然科学)(2019 KJ225)。

摘　　要：为了评估Ti_(3)CNT_(x)/TMAOH材料对模拟放射性废水中Sr^(2+)的吸附性能,选用四甲基氢氧化铵(TMAOH)作插层剂,对其进行改性制备处理,优化产物Ti_(3)CNT_(x)/TMAOH的合成条件,并采用SEM-EDS、XRD、BET和FTIR等对改性前后的样品进行表征分析。序批式实验中考察了吸附剂Ti_(3)CNT_(x)/TMAOH的投加量、时间、pH和竞争离子等因素对除Sr^(2+)效果的影响。结果表明:在投加量为1.0 g·L^(−1)、pH为6、时间为10 min时,对Sr^(2+)的去除率可达99.28%。竞争离子的抑制顺序为Ca^(2+)>>Mg^(2+)>K^(+)>Na^(+)>Cs^(+)。经历4次循环再生后,对Sr^(2+)的去除率为69.56%。整个吸附过程符合准二级动力学模型,吸附等温线符合Redlich-Peterson(RP)模型。在以自来水和湖水为背景配制的模拟含Sr^(2+)废水中,可分别去除93.80%和68.49%的Sr^(2+)。结合各种表征结果分析,表明Ti_(3)CNT_(x)/TMAOH对Sr^(2+)优异的吸附机制可归因于离子交换、表面螯合、静电吸附和层间截留作用。Ti_(3)CNT_(x)/TMAOH was prepared when tetramethylammonium hydroxide(TMAOH)was selected as the intercalating agent.Adsorption performance of Ti_(3)CNT_(x)/TMAOH on Sr^(2+)in simulated radioactive wastewater was evaluated.The synthesized Ti_(3)CNT_(x)/TMAOH was characterized by SEM-EDS,XRD,BET and FTIR.In the batch experiment,the effects of the dosage of adsorbent Ti_(3)CNT_(x)/TMAOH,time,pH and competitive ions on Sr^(2+)removal were investigated.The results show that the removal rate of Sr^(2+)is 99.28%when the dosage is 1.0 g·L^(−1),pH is 6,and the time is 10 min.The inhibition order of competitive ions is Ca^(2+)>>Mg^(2+)>K^(+)>Na^(+)>Cs^(+).After four adsorptiondesorption cycles,the Sr^(2+)removal rate is 69.56%.The adsorption is consistent with the pseudo-second-order kinetic.The adsorption isotherm data conforms to the Redlich-Peterson(R-P)model.93.80%and 68.49%Sr^(2+)can be removed in tap water and lake water,respectively.Sr^(2+)is adsorbed by Ti_(3)CNT_(x)/TMAOH via ion exchange,surface chelation,electrostatic adsorption and interlayer interception.

关 键 词：MXene 四甲基氢氧化铵 改性材料 吸附 Sr2+ 

分 类 号：O647.33[理学—物理化学] TB333[理学—化学]