A novel two-dimensional accordion-like titanium carbide (MXene) for adsorption of Cr(VI) from aqueous solution

摘要

Herein,we report on a novel two-dimensional(2D)material application,which shows that an accordion-like layered Ti_(3)C_(2) nanomaterial(MXene)with an excellent adsorption capacity of Cr(VI)from aqueous solution was prepared by etching Al layer from Ti3AlC2 phase in hydrofluoric acid(HF)solution.Ti_(3)C_(2) nanopowders were well characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and the physical property of as-obtained samples was studied by UV–Vis diffuse reflectance spectra(DRS).After HF treatment,Ti3AlC2 not only has a phase transition from one crystal to another,but surprisingly,its microstructure is also undergoing an obvious change.Ti_(3)C_(2) with product of change possesses an accordion-like multilayer structure,and a relatively higher specific surface area(SSA)than untreated Ti3AlC2.Then,accordionlike Ti_(3)C_(2) with a high SSA provides abundant active sites for pollutant removal and functionalization.Accordion-like Ti_(3)C_(2) nanomaterial exhibits a stable adsorption capacity,and 1 g as-prepared accordion-like Ti_(3)C_(2) powders can remove about 80 mg potassium dichromate.Therefore,the results suggest that 2D MXenes are promising as an effective nanoadsorbent in heavy metal removal from the wastewater.