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Efficient U(VI) Reduction and Sequestration by Ti2CT x MXene.

Lin Wang1, Huan Song1,2, Liyong Yuan1

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Environmental Science & Technology
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Titanium carbide MXene (Ti2CTx) effectively removes uranium from water by sorbing and reducing U(VI) to U(IV). This novel titanium-based material shows promise for environmental remediation of uranium contamination.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Uranium remediation often relies on reducing mobile U(VI) to less soluble U(IV).
  • Current reducing agents are limited, primarily to iron-based materials and microbes.
  • Titanium's role in uranium migration suggests potential for titanium compounds in remediation.

Purpose of the Study:

  • To investigate the efficacy of two-dimensional titanium carbide (Ti2CTx) MXene for uranium removal.
  • To elucidate the sorption-reduction mechanism of U(VI) by Ti2CTx.
  • To assess the potential of Ti2CTx for in situ environmental remediation of uranium.

Main Methods:

  • Batch experiments were conducted to evaluate U(VI) removal efficiency and capacity.
  • X-ray absorption spectroscopy, X-ray diffraction, and photoelectron spectroscopy were used to determine the reduction mechanism.
  • Analysis of uranium species and Ti2CTx transformation under varying pH conditions.

Main Results:

  • Ti2CTx demonstrated excellent U(VI) removal across a wide pH range, with a high uptake capacity of 470 mg g-1 at pH 3.0.
  • The mechanism involves reduction of U(VI) to U(IV), forming mononuclear species at low pH and UO2+x nanoparticles at near-neutral pH.
  • Ti2CTx partially transformed to amorphous TiO2 at near-neutral pH.

Conclusions:

  • Ti2CTx MXene is a highly effective material for U(VI) removal via a sorption-reduction strategy.
  • The pH-dependent reduction mechanism offers insights into uranium immobilization by titanium-based materials.
  • Ti2CTx shows significant potential for applications in permeable reactive barriers for uranium-contaminated wastewater treatment.