Add time:07/28/2019         Source:sciencedirect.com

Basic bismuth nitrates, Bi6O6(OH)2(NO3)4·2H2O and Bi6O5(OH)3(NO3)5·3H2O (respectively denoted as BiON-4N and BiON-5N), were easily synthesized by a grinding-assistant room temperature reaction route through carefully tuning NaOH amounts. The plate-like BiON-5N prepared at NaOH/Bi molar ratio of 2.13 (marked as BiON-5N-2.13; pH ≈ 2.11) exhibited excellent photocatalytic activity for malachite green (MG) and methylene violet (MV) degradation under UV light illumination and the degradation efficiency arrived at nearly 100% and 93.5% within 14 min, respectively, which was obviously higher than BiON-5N prepared under lower pH values (pH = 1.34–2.02), BiON-4N (pH = 2.11–5.96), α-Bi2O3 (pH > 5.96), and even commercial TiO2 (P25). The excellent photocatalytic performance of BiON-5N-2.13 could be attributed to higher surface area and highly exposed (110) facets. Furthermore, BiON-5N-2.13 also possessed good photochemical and structural stability during photocatalysis process, which is crucial to potential practical application.

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