فهرست نشریات علمی دسترسی آزاد ایران

Industrial dye effluents are a persistent source of water pollution, threatening aquatic ecosystems and undermining sustainable development goals. This study presents the development of TiO2/CNT/ZnCo2O4 nanocomposite as an environmental photocatalyst for dye-polluted water, achieved through a two-step synthesis. The incorporation of CNTs and ZnCo2O4 enhanced TiO2’s visible-light photoactivity by reducing charge carrier recombination and improving electron separation. This led to a shifted absorption edge toward the visible light region and a reduced band gap of 2.41 eV, compared to pure TiO2’s 3.28 eV. The nanocomposite demonstrated a 92% degradation of acid blue 113 (AB113) under visible light after 180 minutes. Various operational parameters, including dosage, pH, and H2O2 concentration, were assessed for optimal degradation. Degradation occurred via hydroxyl radicals and photogenerated holes, as identified through radical scavenging tests. Also, the synthesized nanocomposite showed great reusability for accomplishing photodegradation of the AB113 over 5 consecutive reaction cycles, supporting its reusability and pollution-control potential. Overall, the TiO₂/CNT/ZnCo₂O₄ platform couples visible-light harvesting with durable performance, highlighting a practical route toward environmental remediation of dye-laden waters because the textile dye discharges are a persistent aquatic ecosystem stressor. By shifting TiO₂ activity into the visible-light window and achieving high, reusable performance against the anionic dye AB113, the TiO₂/CNT/ZnCo₂O₄ nanocomposite provides a practical photocatalytic option for dye-polluted wastewater, aligning with sustainable pollution-mitigation goals.