The heterogeneous photocatalysis (HPC) based Advanced Oxidation Process (AOP) is an eco-friendly technique for purifying water from organic and biological pollutants in environmental systems. The photocatalysts' overall catalytic performance usually depends on light harvesting, photogenerated charge carrier separation and transfer, and surface reactivity.
, but their practical implementation is restricted for various reasons. These include low efficiencies, complicated photoreactor designs, high operation and synthesis costs, photocatalyst poisoning, and fast electron-hole recombination.
To overcome these issues, a collaboration between academia and industrial partners has evaluated a system where highly organized nanoporous photocatalyst material is employed synergistically with highly efficient UVA LEDs, thin water film and water scrubbing.
Most photocatalytic reactors use nanopowder materials which have inherent limitations. On a lab scale, it is easy to centrifuge the nanomaterial powder after the photocatalytic oxidation of the pollutant. However, on a large scale where thousands of liters of water need to be treated, it becomes challenging to dispense that much powder-based photocatalyst in the water and then make sure all of it is filtered out before discarding the treated water back in the environment.
These slurry-based photocatalytic reactors are typically energy inefficient and prone to catalyst fouling or photo-aggregation. We employed an immobilized photocatalyst grown directly on a titanium substrate, eliminating the need for ultrafiltration and providing mechanical stability to the photocatalyst.
Thin water films and water scrubbing kept the photoreactor saturated with oxygen thus reducing electron-hole recombination. The photoreactor was tested for real-world application such as cleaning
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