Abstract
The pollutant of hexavalent chromium (Cr(VI)) threats to the environment as well as to the human beings due to its strong toxicity, carcinogenicity, mobility and undegradability. Herein, a novel porous aminated red phosphorus (RP) nanosheet photocatalyst was synthesized to remove Cr(VI) from water through adsorption and in-situ photocatalytic reduction. The introduction of NH2 on the surface of RP nanosheet could effectively improve adsorption and photocatalytic reduction performance for Cr(VI) removal during visible light irradiation. As a result, the optimized RP-AP-0.5 (AP: 3-aminopropyltriethoxysilane) nanosheet displays the apparent reaction rate constant of 0.0190 min−1, which is 5.5 times higher than that of pure RP (0.0035 min−1), the 96.5% reduction efficiency for Cr(VI) within 120 min at pH = 4.8 ± 0.1 and still exhibits more than 95% removal efficiency after 5 cycles at the same condition. The enhanced Cr(VI) removal performance of the aminated RP nanosheet can be assigned to accelerating the interfacial reaction dynamics and more effective electron-hole separation owing to the presence of NH2 groups. This study provides a new method to develop high-efficiency metal-free photocatalysts with NH2 modification for Cr(VI) removal.
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