review · RSC Advances
Conventional industrial wastewater treatment methods often fall short of addressing escalating environmental pollution and global energy demands. Metal oxide nanocomposites have emerged as advanced materials capable of driving both pollutant degradation and energy generation through photocatalysis. Examining their structural, electronic, and optical properties helps clarify the fundamental mechanisms governing their performance and shows how operational parameters influence overall efficiency. Combining metal oxides with complementary materials, including carbon-based structures, polymers, non-metals, semiconductors, and metal sulfides, yields synergistic hybrid nanocomposites that substantially enhance photocatalytic activity. Evaluating different synthesis pathways alongside economic factors through cost and SWOT analyses highlights the feasibility of these systems. Ultimately, these nanocomposite technologies offer a route toward scalable and sustainable wastewater remediation, improved water resource management, and clean energy production.
Industrial wastewater and energy shortages present critical challenges to sustainable development worldwide. Photocatalytic metal oxide nanocomposites offer an innovative approach to clean contaminated water while simultaneously generating energy using light. Understanding how to design and combine these nanomaterials economically can help develop scalable, cleaner technologies for water security and environmental protection.
The review addresses applications in industrial wastewater treatment and photocatalytic energy generation, of interest to water utilities, industrial process operators, and clean energy developers. Because the work evaluates synthesis routes, operational parameters, and economic feasibility via cost and SWOT analyses, the technology remains largely at the research and feasibility assessment stage rather than ready for immediate market adoption. Further development is needed to transition these scalable material designs into operational treatment facilities.
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Escalating global energy demands and environmental pollution necessitate innovative solutions for sustainable development. Conventional methods often prove inadequate, driving research towards advanced materials and technologies. This review critically analyzes existing industrial wastewater treatment approaches, highlighting their merits and limitations, before focusing on the recent advancements in metal oxide-based nanocomposite photocatalysis for both pollutant degradation and energy generation. Moreover, the structural, electronic, and optical properties of metal oxides (MOx) are elucidated. The review discusses various MOx synthesis routes and their nanocomposites and elucidates the underlying photocatalytic mechanisms, emphasizing the influence of operational parameters on photocatalytic efficiency. Moreover, it explores how MOx can be utilized for photocatalytic energy generation, in addition to their role in pollutant degradation. Furthermore, it delves into the synergistic effects achieved by combining MOx with complementary nanomaterials (carbon-based structures, polymers, non-metals, semiconductors, and metal sulfides) to create hybrid nanocomposites with enhanced photocatalytic activity for both applications. A cost analysis and SWOT analysis are presented to assess the economic and technological feasibility of this trend. This comprehensive overview provides valuable insights for developing efficient, sustainable, and scalable wastewater treatment solutions using MOx-based nanocomposites, ultimately contributing to improved environmental remediation and water resource management while simultaneously exploring opportunities for energy production.
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DOI: 10.1039/d4ra08780a
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