Ti3C2Tx MXene core-shell spheres for ultrahigh removal of mercuric ions

Abstract

Two-dimensional (2-D) titanium carbide MXene core (Ti 3 C 2 T x ) shell aerogel spheres (MX-SA) for mercuric ion removal were designed and fabricated with varying concentrations of Ti 3 C 2 T x MXene and sodium alginate (SA) using a facile method. Owing to their unique inside structures, high porosities, large specific surface areas, oxygenated functional groups of MXene nanosheets, and available active binding sites, the synthesized microspheres constitute a unique adsorbent for heavy metals removal in water. The MX-SA 4:20 spheres exhibit an exceptional adsorption capacity of 932.84 mg/g for Hg 2+ , which is among the highest value reported for adsorbents. The adsorbent exhibits high single-and multi-component removal efficiencies, with 100% efficiency for Hg 2+ and > 90% efficiency for five heavy metal ions. The synthesized materials are highly efficient for Hg 2+ removal under extreme pH conditions (0.5-1.0 M HNO 3 ) and have additional excellent reproducible properties. The micro-size and spherical shape of MX-SA 4:20 also allow it to be used in column-packed devices.

Highly efficient scavenging of Cr(VI) by two-dimensional titanium carbide nanosheets: kinetics, isotherms and thermodynamics analysis

“…Figure 1(f) showed the FTIR of Ti 3 C 2 T x MXene before and after Cr(VI) adsorption. It can be seen that the distinctive peaks at 3,436, 1,631 and 805 cm À1 were corresponding to the -OH stretching vibrations of Ti 3 C 2 T x MXene, intimating that there were water moieties and -OH group existing on the surface of adsorbent (Shahzad et al 2019). The vibration band at 547 cm À1 presented the Ti-O stretching bands (Karthikeyan et al 2021a(Karthikeyan et al , 2021b, and the adsorption peak at 1629 and 1400 cm À1 belonged to the C ¼ O and C-O stretching vibration of the carboxyl group (Dong et al 2019).…”

Implementing Hybrid Energy Harvesting in 3D Spherical Evaporator for Solar Steam Generation and Synergic Water Purification

“…As displayed in Figure a, XRD patterns of the samples after HF etching and dimethyl sulfoxide (DMSO) exfoliation were in good agreement with the typical structure of Ti 3 C 2 MXene reported in the literature. [ 23 ] Note that it is difficult to see diffraction peaks of MXene in the sample of CM‐0.1‐P due to much stronger diffraction peaks of crystalline Co 3 O 4 . The characteristic peaks (220), (311), (440), (511), and (440) of Co 3 O 4 could be clearly observed, confirming that Co 3 O 4 was formed on the MXene surface during the solvothermal treatment process.…”

Titanium Carbide‐Based Adsorbents for Removal of Heavy Metal Ions and Radionuclides: From Nanomaterials to 3D Architectures

“…[ 94 ] Shahzad et al prepared MXene core‐shell aerogel spheres (MX‐SA) using different concentrations of MXene and sodium alginate. [ 87 ] The adsorption capacity of MX‐SA 4:20 for Hg(II) is 932.84 mg g −1 at pH 5.5, which is the highest among adsorbents. The OH‐, CH‐, and COO‐ groups of alginic acid biopolymers play an important role in the adsorption process.…”