Visible light active photocatalyst for environmental remediation
Nano-sized vanadosilicate AM-6 photocatalyst activated by visible light for degradation of aqueous pollutants in wastewater and groundwater. Enhanced through Cr(III) doping and increased surface defects for improved photocatalytic activity under natural sunlight.
Overview
This solution offers a visible light active photocatalyst based on vanadosilicate AM-6 crystals for environmental remediation applications. Unlike conventional photocatalysts that rely on UV light, AM-6 harnesses the broader visible light spectrum, making it suitable for use under natural sunlight. The technology targets the degradation of toxic aqueous pollutants such as 2,5-dichlorophenol, a common contaminant in industrial wastewater and groundwater, as well as model compounds like methylene blue.
The innovation lies in two key enhancements: isomorphous substitution with Cr(III), which increases photocatalytic activity by an order of magnitude under visible light, and the use of nano-sized crystals that provide higher surface area and significantly improved degradation performance compared to micro-sized counterparts.
Technical specifications
Key features:
- Visible light activation: AM-6 operates under visible light irradiation, capturing a much larger fraction of solar energy than UV-only photocatalysts
- Cr(III) doping: Isomorphous substitution enhances visible light photocatalytic activity by approximately an order of magnitude
- Nano-sized crystal morphology: Nano-sized AM-6 crystals exhibit significantly higher activity than micro-sized crystals for degrading both methylene blue and 2,5-dichlorophenol
- Surface defect engineering: V-OH surface defect groups serve as photocatalytically active sites; increasing surface nucleation relative to lateral spreading during synthesis can enhance photoactivity
- Hydrothermal synthesis: Produced using established hydrothermal methods, enabling scalable and reproducible fabrication
Technology readiness level
The technology is at an early-to-mid stage of development. Preliminary validation has been completed, demonstrating enhanced photocatalytic degradation of methylene blue and 2,5-dichlorophenol using nano-sized AM-6 crystals under visible light. Future work will focus on engineering surface defects during crystal growth to further boost visible light photoactivity. The technology is ready for collaborative research partnerships aimed at scaling synthesis, optimizing performance, and validating effectiveness against additional real-world pollutants.
About Simmons University
Simmons University is a small private, non-profit university in Boston with a women-centered undergraduate experience, coeducational graduate programs, and a close-knit, career-focused character. Its Fenway location places the university near the Longwood Medical Area, major hospitals, medical research facilities, and Boston’s employer network, while internships, clinical placements, field work, and community partnerships create direct experiential connections. Research laboratories, a Nursing Simulation Center, exercise physiology facilities, a makerspace, and faculty-student research programs support practical collaboration and talent development. Research receives federal support from NIH, NSF, NASA, and other sponsors; the Office of Research and Fellowships supports proposals, awards, compliance, and research opportunities.
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