▎ 摘　　要

The coupled photoelectrocatalytic and biodegradation of p-chloronitrobenzene (p-CNB) was developed with the reduced graphene oxide/BiOBr/TiO2 nanotube arrays (GB/TNAs) as the photoelectrodes. The p-CNB removal performance, microbial activity and microbial community were systematically investigated in different bio-reactors. The photoelectrocatalytic degradation improved the biodegradability of p-CNB. Compared to single biodegradation, the coupled degradation process exhibited higher p-CNB removal and mineralization efficiency. The specific oxygen utilization rate and dehydrogenase activity in single biodegradation bioreactor declined by 48.63 % and 41.14 % on day 25, indicating that p-CNB inhibited the microbial metabolic activity. However, the photoelectrocatalytic degradation could effectively reduce the inhibition of p-CNB on microbial activity of bioreactors. The variations of microbial reactive oxygen species production, antioxidant enzyme activity, and lactate dehydrogenase release confirmed that photoelectrocatalytic degradation declined the biotoxicity of p-CNB to the microorganisms in the coupled degradation process. p-CNB reduced the microbial richness and diversity in the single biodegradation process, whereas they increased obviously with the increase of photo-electrocatalytic degradation time in the combined degradation process.