Nanomaterials-Based Wastewater Treatment: Addressing Challenges and Advancing Sustainable Solutions

Nanomaterials have emerged as a transformative solution for wastewater treatment. As such, this review discusses the latest approaches toward the application of nanomaterials (TiO₂, ZnO, carbon nanotubes (CNTs), etc.) for solving the birds-eye view problems of wastewater treatment. For instance, TiO₂ nanoparticles show a good photocatalytic degradation rate of organic pollutants, up to 90% efficiency within 2 h under UV light. CNTs also possess high adsorption capacity, with heavy metals such as Pb reaching values above 400 mg/g. Improvements in pollutant removal, scalability, and durability were all mentioned in the research. On a quantifiable scale, specific pilot systems have observed a drop in energy consumption by 50% via the incorporation of nanomaterials. Critical analysis of challenges, such as potential environmental toxicity, cost, and scalability, is discussed. Surface functionalization and the development of biocompatible nanomaterials are proposed as edge-cutting strategies to reduce these problems. Nanomaterials play a significant role in sustainable wastewater treatment and can help us reach environmental goals, making this research significant to a broader audience; it opens new avenues of circular economy applications in a sustainable context. Similar real-world examples, for instance, the use of nanoscale zero-valent iron (nZVI) for groundwater remediation, serve as illustrations of innovative solutions that can also be scaled.