# Enhanced Performance of nZVI/MXene@CNTs for Rapid As(III) Removal from Aqueous Solutions
## 1 Introduction
prepared magnetic Fe-Cu/TiO\({}_{2}\) nanoparticles for the treatment of As(III)-containing industrial wastewater, and revealed an As(III) removal capacity of around 17.5 mg/g, and more interestingly As(III) was completely oxidized on the adsorbent. [PERSON] [33] et al. synthesized Al\({}_{2}\)O\({}_{3}\)-pillared layered MnO\({}_{2}\)(p-MnO\({}_{2}\)) for the adsorption of Pb(II), Cu(II) and Cd(II) in aqueous solutions, revealing that the BET surface area increased to 166.3 m\({}^{2}\)/g and the substrate spacing expanded to 0.85 nm, which showed a greater heavy-metal ion adsorption capability than MnO\({}_{2}\). The transition metal nanomaterials have great advantages for their controllable particle size, large surface effect, and strong adsorption capabilities to be used widely for the removal of heavy metal ions from water [34; 35; 36; 37]. However, some of the features, such as agglomeration propensity and poor chemical stability should be noticed in certain specific areas [4; 38]. In the past five years, MXene, a novel family of 2D intercalation materials, has become a research hotspot and received extensive attention. It is generally expressed as Mn\({}_{n+1}\)AX\({}_{n}\)T\({}_{x}\), formed from the layered and machinable Mn\({}_{n+1}\)AX\({}_{n}\) phases, where n = 1, 2, 3, M is an early transition metal; X is C or N; A is an element C or B of the periodic table, and T\({}_{x}\) is the surface terminal group [39]. The novel materials possessed specific physicochemical properties, such as high surface areas, unique hydrophilicity, abundant surface functional groups and excellent adsorption capacity, and Ti\({}_{3}\)C\({}_{2}\)T\({}_{X}\) MXene was one of the most explored composites [40]. [PERSON] [41] et al. explored the removal of some pharmaceuticals compounds by Ti\({}_{3}\)C\({}_{2}\)T\({}_{X}\) MXene and revealed the selective adsorption capacity 58.7 mg/g for cationic amitriptyline (AMT), with great reusability after sonication. [PERSON] [42] et al. reported that Ti\({}_{3}\)C\({}_{2}\)T\({}_{X}\) MXene possessed excellent selective adsorption capacity (148 mg/g) of Cs\({}^{+}\) from model low-level radioactivity, achieving rapid purification and substantial reuse. Apart from their outstanding adsorption capacity, Ti\({}_{3}\)C\({}_{2}\)T\({}_{X}\) MXene also has potential for applications in catalytic oxidation [43], electrochemistry [44], photocatalysis [45] and supersensors [46]. Therefore, it is extremely deserving of further study. In this study, a novel three-dimensional mesh intercalation and multifunctional magnetic nanofibers hybrid (nZVI/MXene@CNTs) was prepared for As(III) wastewater treatment. A variety of the characterizations was carried out to understand the possible mechanism of the synthesis of nZVI/MXene@CNTs. It was revealed that the material possessed enhanced adsorption performance, chemical stability and catalytic capabilities. The batch adsorption experiments were utilized to evaluate the capacity of nZVI/MXene@CNTs for As(III) removal and discussed the potential effects of pH, interfering ions and other conditions. The probable adsorption mechanism and catalytic oxidation process of As(III) on nZVI/MXene@CNTs were also investigated.