Volatile-Organic-Compound-Intercepting
Solar Distillation
Enabled by a Photothermal/Photocatalytic Nanofibrous Membrane with
Dual-Scale Pores
Posted on 2020-07-08 - 17:36
Solar
distillation is emerging as a robust and energy-effective
tool for water purification and freshwater production. However, many
water sources contain harmful volatile organic compounds (VOCs), which
can evaporate through the photothermal evaporators and be collected
together with distilled water, or even be enriched in the distilled
water. In view of the penetration of volatile organic compounds, herein,
we rationally demonstrate a dual-scale porous, photothermal/photocatalytic,
flexible membrane for intercepting volatile organic compounds during
solar distillation, which is based on a mesoporous oxygen-vacancy-rich
TiO2–x nanofibrous membrane
(m-TiO2–x NFM). The
dual-scale porous structure was constructed by micrometer-sized interconnected
tortuous pores formed by the accumulation of m-TiO2–x nanofibers and nanometer-sized pores
in the m-TiO2–x individual
nanofibers. Consequently, the membrane can sustainably in situ intercept
VOCs by providing more photocatalytic reactive sites for collision
(mainly by mesopores) and longer tortuous channels for prolonging
VOC retention (mainly by micrometer-sized pores); thus, it results
in less than 5% of phenol residual in distilled water. As a proof
of concept, when the m-TiO2–x NFM
is employed to purify practical river water in an evaporation prototype
under real solar irradiation, complex volatile natural organic contaminants
can be effectively intercepted and the produced distilled water meets
the drinking water standards of China. This development will promote
the application prospects of solar distillation.
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Song, Chengjie; Qi, Dianpeng; Han, Yu; Xu, Ying; Xu, Hongbo; You, Shijie; et al. (2020). Volatile-Organic-Compound-Intercepting
Solar Distillation
Enabled by a Photothermal/Photocatalytic Nanofibrous Membrane with
Dual-Scale Pores. ACS Publications. Collection. https://doi.org/10.1021/acs.est.9b07903