In situ synthesis of novel peroxo-functionalized Ti3C2Tx adsorbent for aqueous pollutants removal: Role of oxygen-containing terminal groups

Tailoring Asymmetric Interface-Triggered Peroxymonosulfate Activation via Staircase-Shaped Edge-Rich-Defective Ti3C2Tx by Mechanochemical Treatment: Hydroxyl “Capping” or “Subtraction” Strategy?

“…The diffraction peaks marked (002), (006), (008), (101), (105), and (110) in the X-ray diffraction (XRD) pattern were the characteristic diffraction peaks of the bulk Ti 3 C 2 T x (Figure S5). 29 ERDT had similar diffraction peaks to the bulk Ti 3 C 2 T x , indicating that ball milling does not destroy the T x −Ti−C−Ti−C−Ti−T x sandwich structure excessively, but the signal of the diffraction peaks became fainter with the increasing ball milling time. Interestingly, the diffraction peak of the (002) crystal plane of ERDT was shifted to low angles and the peak width gradually increased, which is attributed to the violent collision between the agate beads and bulk Ti 3 C 2 T x making the two-dimensional layered structure curl or fracture, resulting in an increase in the interlayer spacing.…”

“…It is well documented that the rich surface functional group of ERDT-2 would get hydroxylated in alkaline environment, which would further enlarge the electrostatic repulsion with PMS and inhibit the adsorption and activation of PMS on low-valent titanium active species. 29 A previous study showed that MXene's pHpzc of around 3 and the C− Ti−OH surface functional group of ERDT-2 would get hydroxylated (pH aq > pH pzc ) when the pH reached up to 11. 36 From the O 1s spectra (Figure S12), the fraction of C− Ti−OH changed after alkaline treatment, increasing from 29.8 to 41.5% in contrast with the initial pH (5.6) in Table S6.…”

“…However, the ERDT catalyst was obviously inferior to its acid environment when the initial pH improved to 11, only degrading 9.3% of CBZ at 0.003 min –1 in 25 min of reaction time. It is well documented that the rich surface functional group of ERDT-2 would get hydroxylated in alkaline environment, which would further enlarge the electrostatic repulsion with PMS and inhibit the adsorption and activation of PMS on low-valent titanium active species . A previous study showed that MXene’s pHpzc of around 3 and the C–Ti–OH surface functional group of ERDT-2 would get hydroxylated (pH aq > pH pzc ) when the pH reached up to 11 .…”

Smart win–win waste management: superhydrophobic filter using valorized cellulose acetate from discarded cigarette butts for cleaning up marine oil spill at Hurghada Red Sea shore in Egypt

“…The saturation of the sorbent pores with oil begins at a critical filter thickness. Beyond this thickness, the removal efficiency decreases (Li et al, 2022). Thus, this approach supports natural recovery and restricts artificial cleanup to industrial ecology levels using waste filter material in minimal doses.…”