Abstract

As a new kind of carbon nanomaterial, MXene not only has the characteristics of high specific surface area and high conductivity, but also has the advantages of flexible composition and controllable minimum nanometer thickness. The large specific surface and large number of functional groups provide rich active sites for it, which is an ideal adsorbent for the removal of heavy metal ions and dyes [1 Novoselov et al., Electric field effect in atomically thin carbon films, Science 306 (5696), 666 (2004). DOI: https://doi.org/10.1126/science.1102896.[Crossref], [PubMed], [Web of Science ®] , [Google Scholar],2 Chen et al., Ethanediamine induced self-assembly of long-range ordered GO/MXene composite aerogel and its piezoresistive sensing performances, Appl. Surf. Sci. 566, 150719 (2021). DOI: https://doi.org/10.1016/j.apsusc.2021.150719.[Crossref] , [Google Scholar]]. The unique structure of aerogel can not only give full play to the inherent physical and chemical properties of monolayer MXene, solve the problem of easy agglomeration of MXene lamella, but also give it uniform and dense porosity, which can greatly improve the adsorption effect, and the macro structure is easy to recycle when used in water phase, reducing the secondary pollution it may bring to the environment. In this project, Ti₃C₂T_x aerogels with excellent mechanical properties and stability were prepared, and Ti₃C₂T_x MXene/CNTs aerogels were compounded with carbon nanotubes, and the adsorption performance of Pb²⁺ in water was investigated at different temperatures and pH values, It can purify water source polluted by heavy metals discharged by industry greatly [3 Kemp et al., Environmental applications using graphene composites: Water remediation and gas adsorption, Nanoscale 5 (8), 3149 (2013). DOI: https://doi.org/10.1039/c3nr33708a.[Crossref], [PubMed], [Web of Science ®] , [Google Scholar]–5 K. R. Garrick Lim et al., Rational design of two-dimensional transition metal carbide/nitride (MXene) hybrids and nanocomposites for catalytic energy storage and conversion, ACS Nano 14 (9), 10834 (2020).[Crossref], [PubMed] , [Google Scholar]]. The following topics are discussed in this paper：（1）MXene aerogel and Ti₃C₂T_x/MWCNTs aerogel were prepared by self-assembly method.（2）Study on the adsorption performance of MXene aerogel and Ti₃C₂T_x/MWCNTs aerogel for Pb²⁺.

摘要

MXene作为一种新型碳纳米材料，不仅具有高比表面积、高导电性等特点，而且具有成分灵活、最小纳米厚度可控等优点。大的比表面积和大量的官能团为其提供了丰富的活性位点，是去除重金属离子和染料的理想吸附剂[ 1诺沃肖洛夫等人。,原子薄碳膜中的电场效应，Science 306 (5696), 666 ( 2004 )。DOI：https://doi.org/10.1126/science.11​​02896。[交叉引用]、[PubMed]、[Web of Science ®]  、[谷歌学术]、 2陈等人。,乙二胺诱导长程有序 GO/MXene 复合气凝胶的自组装及其压阻传感性能，Appl。冲浪。科学。 566、150719（2021）。_ DOI：https://doi.org/10.1016/j.apsusc.2021.150719。[交叉引用] ，[谷歌学术] ]。气凝胶的独特结构不仅可以充分发挥单层MXene固有的物理化学性质，解决MXene薄片易团聚的问题，而且赋予其均匀致密的孔隙率，可以大大提高吸附效果，宏观结构在水相中使用时易于回收利用，减少了可能给环境带来的二次污染。本项目制备了具有优异力学性能和稳定性的Ti ₃ C ₂ T _{x气凝胶，并将Ti 3} C ₂ T _x MXene/CNTs气凝胶与碳纳米管复合，以及对Pb ^{2+的吸附性能}在不同温度和 pH 值下对水中的水中进行了调查，它可以大大净化工业排放的重金属污染的水源 [ 3坎普等人。,使用石墨烯复合材料的环境应用：水修复和气体吸附，Nanoscale 5 (8), 3149 ( 2013 )。DOI：https://doi.org/10.1039/c3nr33708a。[Crossref]、[PubMed]、[Web of Science ®]  、[Google Scholar] – 5 KR Garrick Lim 等人。,用于催化能量存储和转换的二维过渡金属碳/氮化物（MXene）杂化物和纳米复合材料的合理设计， ACS Nano 14（9）， 10834（ 2020）。[交叉引用]，[PubMed]  ，[谷歌学术] ]。本文主要讨论以下主题：（1）MXene气凝胶和Ti₃C₂T_x/MWCNTs气凝胶的自组装法制备。（2）MXene气凝胶和Ti₃C₂T_x/用于 Pb²⁺。