Synergistic Effect of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene Nanosheets and Tannic Acid-Fe<sup>3+</sup> Network in Constructing High-Performance Hydrogel Composite Membrane for Photothermal Membrane Distillation.
basic_science · Level V
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- Record sourced from PubMed, PMID 38166126.
- Also identified by DOI 10.1021/acs.nanolett.3c04159.
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Abstract
Photothermal membrane distillation (PMD) has emerged as a promising and sustainable approach for seawater desalination and wastewater purification. However, the wide application of the technique is severely impeded by low freshwater production and membrane fouling/wetting issues. Herein, we developed an advanced hydrogel-engineered membrane with simultaneously enhanced photothermal conversion capacity and desired fouling and wetting resistance for PMD. By the synergies of photothermal Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene nanosheets and the tannic acid-Fe<sup>3+</sup> network in the hydrogel, the membrane was endowed with excellent surface self-heating ability, yielding the highest freshwater production rate (1.71 kg m<sup>-2</sup> h<sup>-1</sup>) and photothermal efficiency among the fabricated hydrogel composite membranes under 1 sun irradiation. Meanwhile, the PMD membrane could robustly resist oil-induced fouling and surfactant-induced wetting, significantly extending the membrane lifespan in treating contaminated saline water. Furthermore, when desalinating real seawater, the membrane exhibited superior durability with a stable vapor flux and excellent ion rejection (e.g., 99.24% for boron) for 100 h.