Chloronitrobenzenes are typical refractory aromatic halogenated nitroaromatic and high-toxic contaminants. The reduction process of chloronitrobenzenes cannot realize their mineralization, and the existence of chlorine group is detrimental to degradation through single chemical oxidation technology. Herein, the Au nanoparticles and graphitic carbon nitride co-modified TiO₂ nanotube arrays (Au/g-C₃N₄/TNAs) photoanodes were fabricated to degrade o-chloronitrobenzene (o-CNB) target pollutant in photoelectrocatalytic (PEC) system. The Au/g-C₃N₄/TNAs fabricated with 0.20 mM HAuCl₄0.4 H₂O (Au/g-C₃N₄/TNAs-0.20) had more superior optical and photoelectrochemical properties than other fabricated photoanodes. Au/g-C₃N₄/TNAs-0.20 photoanode increased dechlorination efficiency through reduction process, which was beneficial to o-CNB degradation and TOC removal. The coexistence of anions and humic acid inhibited the PEC degradation of o-CNB. The photogenerated electron, ^•O₂⁻, hole and ^•OH participated in o-CNB degradation in PEC system. The degradation pathway of o-CNB was inferred through GC-MS spectra and DFT calculation. The acute toxicity and bioaccumulation factor of o-CNB were effectively reduced by PEC degradation.

氯硝基苯是典型的难降解芳族卤代硝基芳烃和高毒污染物。氯硝基苯的还原过程无法实现其矿化，氯基团的存在不利于单一化学氧化技术的降解。在此，制备了Au纳米颗粒和石墨氮化碳共修饰的TiO ₂纳米管阵列（Au/gC ₃ N ₄ /TNAs）光阳极，以在光电催化（PEC）系统中降解邻氯硝基苯（o -CNB）目标污染物。用 0.20 mM HAuCl ₄ 0.4 H ₂ O ₍ Au _/ gC ₃N ₄ /TNAs-0.20) 比其他制造的光阳极具有更优越的光学和光电化学性能。Au/gC ₃ N ₄ /TNAs-0.20光阳极通过还原过程提高了脱氯效率，有利于o -CNB降解和TOC去除。阴离子和腐殖酸的共存抑制了o -CNB的PEC降解。PEC体系中光生电子、^• O ₂ ^-、空穴和 ^• OH参与了o -CNB的降解。o的降解途径-CNB通过GC-MS光谱和DFT计算推断。PEC降解有效降低了o -CNB的急性毒性和生物蓄积因子。