Fabrication of PVDF/CdS/Bi2S3/Bi2MoO6 and Bacillus/PVA hybrid membrane for efficient removal of nitrite

[Display omitted] •Development of bio-photocatalytic membrane for the degradation of nitrite.•Conversion of nitrite with high nitrogen selectivity and no accumulation of byproducts.•Bio-photocatalytic membrane is stable and exhibits excellent reusability. Nitrite is a widespread form of pollution that directly reduces the oxygen-carrying capacity of the blood of aquatic breathing species has drawn global attention. In this work, sustainable bio-photocatalytic hybrid membrane was fabricated for efficient removal of nitrite. The polyvinylidene fluoride (PVDF) and heterojunction photocatalyst CdS/Bi2S3/Bi2MoO6 were used to prepare the photocatalytic membrane. And the bio-membrane was prepared by cross-linking method using a polyvinyl alcohol (PVA) entrapping enriched nitrite-degrading bacteria (Bacillus cereus 16, BC16). The bio-photocatalytic hybrid membrane exhibited excellent degradation capacity of nitrite under visible light. The selectivity of N2 was improved significantly, and the no toxic byproducts were accumulated in the system. Moreover, the hybrid membrane maintained fairly consistent photocatalytic performance for the degradation of nitrite after reuse. The possible mechanism was elucidated by analyzing the product, the effects of pH values, electron scavengers, and hole scavengers on the photocatalytic performance were further investigated. This study provides an efficient strategy for deep denitrification treatment of nitrite contaminated water.