Among the hazardous organic and inorganic pollutants, organic dyes, nitrate (NO₃^-), carbon dioxide (CO₂), and toxic heavy metals (THMs) are four types of hazardous contaminants that have become a serious global problem. Recently, perovskite photocatalysts have shown high efficiency in removing water and air contaminants. In this research, zero-valent iron nanoparticles (nZVI)- doped Al₂ZnTiO₆ (AZTO) double perovskite/graphitic carbon nitride (g-C₃N₄(gCN)) nanocomposite (NC) was firstly synthesized by the sol-gel method as a new high-efficiency perovskite photocatalyst. Also, the influence of the main factors such as solution pH, reaction time, photocatalyst dosage, and contaminants concentration on the photocatalytic performance of the nZVI-doped Al₂ZnTiO₉/g-C₃N₄ nanocomposite was evaluated. Due to the unique features of the nZVI-doped Al₂ZnTiO₆/g-C₃N₄ structure and suitable band gap position, which is suitable for the efficient migration e^-/h⁺ charges dissociation and the enhancement of photocatalytic activity, this nanocomposite showed effective performance to the elimination of methyl orange (MO) anion, and methylene blue (MB) cation dye, NO₃^-, CO₂, and THMs contaminants. The UV-visible spectra showed the elimination efficiency of 88%, 87%, 80%, 72%, and 90% for methyl orange anion dye, methylene blue cation dye, nitrate, carbon dioxide, and toxic heavy metals in optimal experiment conditions, respectively. Also, IEC and GC analysis showed an efficiency of 60% for the photoconversion of nitrate to harmless nitrogen gas (N₂) and 42% for the photoconversion efficiency of CO₂ to Methane (CH₄) gas fuel. Eventually, the nZVI-doped Al₂ZnTiO₆/g-C₃N₄ nanocomposite displayed good recyclability and high photocatalytic activity compared to recently synthesized photocatalysts by testing its photocatalytic property after five repetitions.

在有害有机和无机污染物中，有机染料、硝酸盐（NO ₃ ^-）、二氧化碳（CO ₂）和有毒重金属（THMs）是四类有害污染物，已成为严重的全球性问题。最近，钙钛矿光催化剂在去除水和空气污染物方面表现出高效率。在这项研究中，零价铁纳米粒子 (nZVI)-掺杂的 Al ₂ ZnTiO ₆ (AZTO) 双钙钛矿/石墨碳氮化物 (gC ₃ N ₄(gCN)) 纳米复合材料 (NC) 作为一种新型高效钙钛矿光催化剂，首次采用溶胶-凝胶法合成。此外，还评估了溶液pH值、反应时间、光催化剂用量和污染物浓度等主要因素对nZVI掺杂Al 2 ZnTiO 9 _/ gC ₃ N ₄纳米_{复合材料光催化性能的影响。}由于nZVI掺杂Al ₂ ZnTiO ₆ /gC ₃ N ₄结构的独特性和合适的带隙位置，适用于高效迁移e ^- /h ⁺电荷解离和光催化活性的增强，这种纳米复合材料对消除甲基橙 (MO) 阴离子和亚甲蓝 (MB) 阳离子染料、NO 3 - 、CO 2 和 THMs 污染物表现_出^有效的_性能。紫外-可见光谱表明，在最佳实验条件下，甲基橙阴离子染料、亚甲蓝阳离子染料、硝酸盐、二氧化碳和有毒重金属的去除效率分别为 88%、87%、80%、72% 和 90%，分别。此外，IEC 和 GC 分析表明，将硝酸盐光转化为无害氮气 (N ₂ ) 的效率为 60%，将 CO ₂光转化为甲烷 (CH ₄ ) 气体燃料的效率为 42%。最终，nZVI 掺杂的 Al₂ ZnTiO ₆ /gC ₃ N ₄纳米复合材料通过重复五次光催化性能测试，与最近合成的光催化剂相比，显示出良好的可回收性和高光催化活性。