NiTiO₂NT and TiO₂ nanotube-based photoelectrodes were prepared by anodic oxidation and employed for the degradation of humic acid (HA) and disinfection simultaneously by the photoelectrocatalytic (PEC) process under natural sunlight irradiation. Scanning electron microscopy coupled with energy-dispersive spectroscopy (EDX) studies confirmed that uniform nanotubes TiO₂ covered all surface of Ti foil and Ni doped to TiO₂NT. The highest efficiency for HA degradation and disinfection rate by PEC was observed for the NiTiO₂NT photoelectrode. The influences of different parameters such as initial HA concentration (2–8 mg/L), voltage (2–20 V), bacterial density (2 × 10²,10⁴,10⁷ CFU), time (30–60 min), light source (UV–Vis) and type of electrode (NiTiO₂NT/AC-PTFE, TiO₂NT/AC-PTFE) on disinfection of water and degradation of the HA were studied using response surface methodology (RSM). The results showed that the maximum degradation rate of HA and Log bacterial removal reached 87.18% and 3.77 after 60 min reaction time at a 20 V voltage with NiTiO₂NT/AC-PTFE electrode and UV as a source of irradiation. Also, results showed that doping Ni to TiO₂NT electrode increase PEC efficiency under Vis-light source. To determine the HA degradation pathway, the organic byproducts were identified by GC–MS analysis.

通过阳极氧化制备NiTiO ₂ NT和TiO ₂纳米管基光电电极，并在自然阳光照射下通过光电催化（PEC）同时降解腐殖酸（HA）和消毒。扫描电子显微镜与能量色散光谱法（EDX）的研究证实，均匀的纳米管TiO ₂覆盖了钛箔的所有表面，并且Ni掺杂到TiO ₂ NT中。对于NiTiO ₂ NT光电极，观察到PEC对HA降解和消毒率的最高效率。不同的参数，如初始HA浓度（2-8毫克/升），电压（2-20 V），细菌密度（2×10的影响²，10 ⁴，10 ⁷ CFU），时间（30–60分钟），光源（UV–Vis）和电极类型（NiTiO ₂ NT / AC-PTFE，TiO ₂ NT / AC-PTFE）对水进行消毒并降解使用响应面方法（RSM）研究了HA。结果表明，在20 V电压下，以NiTiO ₂ NT / AC-PTFE电极和UV为辐照源，在60 V反应时间后，HA和Log细菌去除的最大降解率分别达到87.18％和3.77 。此外，结果表明，在可见光源下，将Ni掺杂到TiO ₂ NT电极上可提高PEC效率。为了确定HA的降解途径，通过GC-MS分析鉴定了有机副产物。