Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 4, Pages 5876-5886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c22952
Keywords
solar-driven interface evaporation; MXene; copper indium selenide; photothermal membrane; water treatment; desalination
Funding
- NATIONAL R&D PROGRAM of CHINA [2017YFA0207400]
- Fundamental Research Funds for the Central Universities [JB211405]
- National Natural Science Foundation of China [11604250]
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This study reports a composite photothermal membrane based on MXene nanoflakes and copper indium selenide nanoparticles for highly efficient solar-driven interface evaporation in water treatment. The results show that the composite membrane has advantages in improving light-to-heat conversion efficiency and impurity removal ability, and it also exhibits excellent durability and adaptability to light intensity.
Solar-driven interface evaporation recently emerges as one of the most promising methods for seawater desalination and wastewater purification, mainly due to its low energy consumption. However, there still exist special issues in the present material system based on conventional noble metals or two-dimensional (2D) nanomaterials etc., such as high costs, low light-to-heat conversion efficiencies, and unideal channels for water transport. Herein, a composite photothermal membrane based on Ti3C2Tx MXene nanoflakes/copper indium selenide (CIS) nanoparticles is reported for highly efficient solar-driven interface evaporation toward water treatment applications. Results indicate that the introduction of CIS improves the spatial accessibility of the membrane by increasing the interlayer spacings and wettability of MXene nanoflakes and enhances light absorption capability as well as reduces reflection for the photothermal membrane. Simultaneously, utilization of the MXene/CIS composite membrane improves the efficiency of light-to-heat conversion probably due to formation of a Schottky junction between MXene and CIS. The highest water evaporation rate of 1.434 kgm(- 2) h(- 1) and a maximum water evaporation efficiency of 90.04% as well as a considerable costeffectiveness of 62.35 g h(-1)/$ are achieved by using the MXene/CIS composite membrane for solar interface evaporation, which also exhibits excellent durability and light intensity adaptability. In addition, the composite photothermal membrane shows excellent impurity removal ability, e.g., >98% for salt ions, >99.8% for heavy metal ions, and similar to 100% for dyes molecules. This work paves a promising avenue for the practical application of MXene in the field of water treatment.
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