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Is photocatalytic oxidation a sustainable technology for microplastic removal from water? A critical review
Summary
Scientists have been exploring a light-based technology (similar to how sunlight can break down certain pollutants) as a way to destroy microplastics in water, but this review of existing research finds it has serious drawbacks. The process is slow, requires a lot of energy, and, most concerning, can actually break microplastics down into toxic byproducts and chemical additives that may be just as harmful to human health as the original plastic. Instead, the researchers suggest a more promising path forward: using similar technology to transform microplastic waste into useful products and fuels rather than trying to destroy it outright.
Given their environmental and health risks, the removal of microplastics (MPs) from water has attracted considerable attention from the scientific community. Several research groups are developing advanced technologies for the detection and removal of MPs from water. This review critically evaluates the application of photocatalytic technology for the oxidation of MPs in water, with particular emphasis on the major limitations of this approach. Although solar-driven photocatalysis is generally considered a clean and sustainable technology, its use for MPs oxidation raises several serious environmental, practical, and safety concerns. Based on the available literature, photocatalytic technology for MPs oxidation faces several major limitations. The oxidation process is generally slow and energy-intensive. Additionally, the efficiency of the process is highly sensitive to operating conditions such as pH and temperature conditions. Finally, the oxidation of MPs can lead to the release of toxic by-products and additives, raising further environmental and health concerns. These limitations currently hinder the practical implementation of photocatalytic technology. These challenges are comprehensively discussed and supported by representative case studies. Alternatively, the photocatalytic upgrading of MPs into high-value products and fuels has been discussed as a potentially more sustainable alternative to conventional photocatalytic oxidation in water, aligning with the principles of a circular economy and zero-waste strategies.