Water compatibility for heterogeneous photocatalysts has been pursued for energy and environmental applications. However, there exists a trade‐off between hydrophilicity and recyclability of the photocatalyst. Herein, we report a conjugated polymer photocatalyst with tertiary amine terminals that reversibly binds CO 2 in water, thereby generating switchable hydrophilicity. The CO 2 ‐assisted hydrophilicity boosted the photocatalytic efficiency in aqueous medium with minimum dosage. When CO 2 was desorbed, the photocatalyst could be simply regenerated from reaction media, facilitating the repeated use of photocatalyst. Hydrophilicity/hydrophobicity control of the polymer photocatalyst was successfully showcased through a variety of organic photoredox reactions under visible‐light irradiation in water.
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Byun et al. (2018) studied this question.
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