作为具有代表性的二维纳米材料之一,MXene通过层层堆叠可以构建具有分子筛分通道的新型二维分离膜。利用氟化锂/盐酸原位生成氢氟酸的方法,系统地研究了刻蚀液浓度对碳化钛(Ti3C2)系MXene纳米片结构的影响,并利用热处理探究了MXene二维膜的结构演变。结果表明,当刻蚀剂中F-的摩尔质量是Al3+的7倍及以上时,能获得较好的单层MXene,且纳米片层之间的层间距随着刻蚀剂中F-浓度的提高而增大;利用热自交联反应,可以在增强纳米片层与片层之间作用力的同时,改变纳米片的层间距。
MXene,as a representative two-dimensional (2D) nanomaterials,can construct a new two-dimensional separation membrane with molecular sieving channels by stacking layer by layer.The effects of etching fluid concentration on the structure of T3C2-based MXene nanosheets were systematically studied using in-situ generation of hydrofluoric acid from lithium fluoride (LiF)/hydrochloric acid.The structure evolution of MXene 2D membranes was explored by simple heat-treatment.The results showed that when the molar mass of F- in the etchant was 7 times or more than that of Al3+,better single-layer MXene could be obtained,and the layer-spacing between the nanosheet layers increased with the increase of F- concentration in the etchant.Using the thermal self-crosslinked reaction,the layer-spacing of the nanosheets could be changed while enhancing the force between the nanosheets.
[1] Naguib M,Kurtoglu M,Presser V,et al.Two-dimensional nanocrystals produced by exfoliation of Ti3 AlC2[J].Adv Mater,2011,23(37):4248-4253.
[2] Naguib M,Barsoum M W,Gogotsi Y.Ten years of progress in the synthesis and development of MXenes[J].Adv Mater,2021,33(39):2103393.
[3] Alhabeb M,Maleski K,Anasori B,et al.Guidelines for synthesis and processing of two-dimensional titanium carbide (Ti3C2Tx MXene)[J].Chemistry of Materials,2017,29(18):7633-7644.
[4] Halim J,Lukatskaya M R,Cook K M,et al.Transparent conductive two-dimensional titanium carbide epitaxial thin films[J].Chem Mater,2014,26(7):2374-2381.
[5] Ghidiu M,Lukatskaya M R,Zhao M Q,et al.Conductive two-dimensional titanium carbide 'clay' with high volumetric capa-citance[J].Nature,2014,516(7529):78-81.
[6] Zhang T,Pan L,Tang H,et al.Synthesis of two-dimensional Ti3C2Tx MXene using HCl+LiF etchant:enhanced exfolia-tion and delamination[J].Journal of Alloys and Compounds,2017,695:818-826.
[7] Shuck C E,Ventura-Martinez K,Goad A,et al.Safe synthesis of MAX and MXene:guidelines to reduce risk during synthesis[J].ACS Chemical Health & Safety,2021,28(5):326-338.
[8] Karahan H E,Goh K,Zhang C J,et al.MXene materials for designing advanced separation membranes[J].Adv Mater,2020,32(29):1906697.
[9] Pandey R P,Rasool K,Madhavan V E,et al.Ultrahigh-flux and fouling-resistant membranes based on layered silver/MXene (Ti3C2Tx) nanosheets[J].Journal of Materials Chemistry A,2018,6(8):3522-3533.
[10] Wang S,Wang F,Jin Y,et al.Removal of heavy metal cations and co-existing anions in simulated wastewater by two separated hydroxylated MXene membranes under an external voltage[J].Journal of Membrane Science,2021,638:119697.
[11] Ding L,Li L,Liu Y,et al.Effective ion sieving with Ti3C2Tx MXene membranes for production of drinking water from seawater[J].Nature Sustainability,2020,3(4):296-302.
[12] Ren C E,Hatzell K B,Alhabeb M,et al.Charge and size-selective ion sieving through Ti3C2Tx MXene membranes[J].J Phys Chem Lett,2015,6(20):4026-4031.
[13] Qu K,Dai L,Xia Y,et al.Self-crosslinked MXene hollow fiber membranes for H2/CO2 separation[J].Journal of Membrane Science,2021,638:119669.
[14] Li J,Li X,Van der Bruggen B.An MXene-based membrane for molecular separation[J].Environmental Science:Nano,2020,7(5):1289-1304.
[15] Abraham J,Vasu K S,Williams C D,et al.Tunable sieving of ions using graphene oxide membranes[J].Nat Nanotechnol,2017,12(6):546-550.
[16] Fan Y,Li J,Wang S,et al.Nickel(Ⅱ) ion-intercalated MXene membranes for enhanced H2/CO2 separation[J].Frontiers of Chemical Science and Engineering,2020,15(4):882-891.
[17] Ding L,Xiao D,Lu Z,et al.Oppositely charged Ti3C2Tx MXene membranes with 2D nanofluidic channels for osmotic energy harvesting[J].Angew Chem Int Ed Engl,2020,59(22):8720-8726.
[18] Wang J,Zhang Z,Zhu J,et al.Ion sieving by a two-dimensional Ti3C2Tx alginate lamellar membrane with stable interlayer spacing[J].Nat Commun,2020,11(1):3540.
[19] Voigt C A,Ghidiu M,Natu V,et al.Anion adsorption,Ti3C2Tz MXene multilayers,and their effect on claylike swelling[J].The Journal of Physical Chemistry C,2018,122(40):23172-23179.
[20] Lu Z,Wei Y,Deng J,et al.Self-crosslinked MXene (Ti3C2Tx) Membranes with good antiswelling property for monovalent metal ion exclusion[J].ACS Nano,2019,13(9):10535-10544.
[21] Wei Y,Zhang P,Soomro R A,et al.Advances in the synthesis of 2D MXenes[J].Adv Mater,2021,33(39):2103148.
基金资助
安徽省重点研究和开发计划项目(2022a05020041);安徽省教育厅重点项目(KJ2020A0669,KJ2021A1015);中国科学院过程工程研究所生化工程国家重点实验室开放基金(IPE-CAS-20190320);合肥学院人才科研基金项目(20RC33)
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