Enhanced 1,2-dichloroethane removal using g-C₃N₄/Blue TiO₂ nanotube array photoanode in microbial...

The compound 1,2-dichloroethane (1,2-DCA), a persistent and ubiquitous pollutant, is often found in groundwater and can strongly affect the ecological environment. However, the extreme bio-impedance of C-Cl bonds means that a high energy input is needed to drive biological dechlorination. Biotechnology techniques based on microbial photoelectrochemical cell (MPEC) could potentially convert solar energy into electricity and significantly reduce the external energy inputs currently needed to treat 1,2-DCA. However, low electricity-generating efficiency at the anode and sluggish bioreaction kinetics at the cathode limit the application of MPEC. In this study, a g-C₃N₄/Blue TiO₂-NTA photoanode was fabricated and incorporated into an MPEC for 1,2-DCA removal. Optimal performance was achieved when Blue TiO₂ nanotube arrays (Blue TiO₂-NTA) were loaded with graphitic carbon nitride (g-C₃N₄) 10 times. The photocurrent density of the g-C₃N₄/Blue TiO₂-NTA composite electrode was 2.48-fold higher than that of the pure Blue TiO₂-NTA electrode under light irradiation. Furthermore, the MPEC equipped with g-C₃N₄/Blue TiO₂-NTA improved 1,2-DCA removal efficiency by 45.21% compared to the Blue TiO₂-NTA alone, which is comparable to that of a microbial electrolysis cell. In the modified MPEC, the current efficiency reached 69.07% when the light intensity was 150 mW cm^-2 and the 1,2-DCA concentration was 4.4 mM. The excellent performance of the novel MPEC was attributed to the efficient direct electron transfer process and the abundant dechlorinators and electroactive bacteria. These results provide a sustainable and cost-effective strategy to improve 1,2-DCA treatment using a biocathode driven by a photoanode.