MUMBAI, India, May 1 -- Intellectual Property India has published a patent application (202631052047 A) filed by Asansol Engineering College, Asansol, West Bengal, on April 23, for 'a solar photocatalytic process using sonochemically synthesized zinc oxide nanoparticles for removal of hexavalent chromium and azo dyes from wastewater.'

Inventor(s) include Dr. Avik De; and Mr. Biplab Saha.

The application for the patent was published on May 1, under issue no. 18/2026.

According to the abstract released by the Intellectual Property India: "The present invention discloses a solar-assisted photocatalytic process for the removal of hexavalent chromium and azo dyes from wastewater using sonochemically synthesized zinc oxide nanoparticles. The nanoparticles are prepared under mild conditions and exhibit enhanced photocatalytic activity under sunlight. The process enables efficient reduction of Cr(VI) to Cr(III) and oxidation of organic dyes, resulting in reduced toxicity and improved water quality. Ecotoxicological studies confirm the environmental safety of the treated wastewater."

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