Two-Dimensional Titanium Carbide for Efficiently Reductive Removal of Highly Toxic Chromium(VI) from Water

Abstract

Two dimensional (2-D) Ti3C2Tx nanosheets are obtained by etching bulk Ti3C2Tx powders in HF solution and delaminating ultrasonically, which exhibit excellent removal capacity for toxic Cr(VI) from water, due to their high surface area, well dispersibility, and reductivity. The Ti3C2Tx nanosheets delaminated by 10% HF solution present more efficient Cr(VI) removal performance with capacity of 250 mg g(-1), and the residual concentration of Cr(VI) in treated water is less than 5 ppb, far below the concentration (0.05 ppm) of Cr(VI) in the drinking water standard recommended by the World Health Organization. This kind of 2-D Ti3C2Tx nanosheet can not only remove Cr(VI) rapidly and effectively in one step from aqueous solution by reducing Cr(VI) to Cr(III) but also adsorb the reduced Cr(III) simultaneously. Furthermore, these reductive 2-D Ti3C2Tx nanosheets are generally explored to remove other oxidant agents, such as K3[Fe(CN)6], KMnO4, and NaAuCl4 solutions, by converting them to low oxidation states. These significantly expand the potential applications of 2-D Ti3C2Tx nanosheets in water treatment.

Magnetic RuCo nanoparticles supported on two-dimensional titanium carbide as highly active catalysts for the hydrolysis of ammonia borane

“…2c), the 2q value of the (002) peak of Ti 3 C 2 X 2 shifted to a lower angle when Ru and Co were deposited on Ti 3 C 2 X 2 surface (Fig. 2d), which was attributed to the occurrence of intercalation and delamination reaction during the hydrolysis process [29]. Moreover, no diffraction peaks corresponding to Ru and/ or Co were observed because of the small particle size of RuCo NPs on Ti 3 C 2 X 2 surface.…”

“…The resulting Ti 3 C 2 X 2 sheets possess some extraordinary chemical and physical properties due to the presence of functional groups and site interactions on the Ti 3 C 2 X 2 surfaces [25]. Therefore it has been tentatively investigated in the fields of electrochemistry [26,27] and sorption [25,28,29] because of its hydrophilic surfaces, chemical stabilities and environmental friendliness. Our recent studies have shown that Ti 3 C 2 X 2 -supported Ru-based catalysts exhibit excellent catalytic activity for hydrogen generation from the aqueous phase hydrolysis of NaBH 4 [30] and AB [31].…”

2D titanium carbide (MXene) for wireless communication

“…These surface terminations account for hydrophilicity of MXene flakes, which can be delaminated into colloidal solutions of single 2D flakes ( 16 ). MXene flakes are negatively charged with ξ potential from −30 to −80 mV ( 17 ), forming stable colloidal solution in various organic and non-organic solvents ( 18 ). The as-synthesized MXene clay or the colloidal solution can be processed into flexible, conductive thin films without any binder via various methods including rolling ( 19 ), spraying ( 20 ), spin coating, drop casting ( 21 ), and printing, which makes MXene a great candidate for RF applications.…”

Fabrication of tunable hierarchical MXene@AuNPs nanocomposites constructed by self-reduction reactions with enhanced catalytic performances

“…The earliest discovered transition metal 2D carbide/nitride is a member of the MXene family [11,12]. At present, MXene [13] is mainly synthesized by the corrosion of the A-group layered M n+1 AX n (MAX) phase by hydrofluoric acid, where n = 1 to 3, M is an early transition metal, A is an A-group (mostly IIIA and IVA, or groups 13 and 14) element and X is either carbon and/ or nitrogen [14][15][16][17]. The surface of MXene contains many active groups, such as hydroxyl groups, oxygen ions, and fluorine ions [18][19][20].…”