Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Process for Preparing a Defect Induced Coloured Titania
Categories for this Invention
Category: Chemistry & chemical Analysis
Industry: Catalysts/Chemical & Advanced Materials Manufacturing, Photocatalyst
Applications: Catalyst/ Photocatalyst, Chemical, photochemical reaction, semiconductor
Market: The global methanol market is likely to grow at 4.5% CAGR from $28.7B to $39.2 B2021-2028.
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Problem Statement
- TiO2 is one of the most widely used photocatalyst for several photo catalytic applications owing to its low cost, low toxicity and high activity.
- It’s a wide band gap semiconductor and it absorbs mostly UV light for the photochemical reaction on surface which hindered its practical applications.
- Therefore, it is essential to find an alternative to improvise UV active to visible-light driven photocatalyst that is stable and highly efficient for many photocatalytic applications.
- The present patent performs Photocatalytic hydrogen evolution to understand the co-relation characteristic of electronic structure and the photoactivity with Pressure treated nitrogen doped colour Titania.
Technology
The present patent discloses a process for preparing a nitrogen-doped defect induced coloured Titania prepared by simple two-step process treated in vacuum, controlled pressure & temperature treatment in N2 atmosphere, shown in Fig. 1 & 2.
Process:
- Producing a nitrogen-doped Titania photocatalyst by simple two-step process starting from commercial grade (Aeroxide P25) wherein nitrogen-doped Titania is treated in vacuum & subjected to controlled pressure & temperature treatment in N2 atmosphere that give rise to colour TiO2 (P25-PBL & P25-PBK).
- The nitrogen-doped Titania is treated in vacuum and subjected to controlled pressure and temperature treatment in N2 atmosphere that give rise to colour (defect) TiO2 (P25-PBL & P25-PBK).
- The defect concentration of electron trapped in vacant sites and Ti3+ centers, is quantified by EPR and the EPR signal for Ti3+ centers present in coloured Titania are responsible for photocatalytic hydrogen evolution.
- The defect induced coloured Titania do not observe any significant phase transformation from anatase to rutile phase in P25-PBL and P25-PBK.
Key Features / Value Proposition
- This invention relates to novel sodium ion incorporated coloured Titania via chemical reduction method using NaBH4 as a reducing agent in high pure H2 atmosphere.
- This invention discloses the strategies to generate different defects concentration, different photo-activity results are observed.
- The increase of visible-light absorption may originate from impurity deep and shallow energy levels within the electronic band structure.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Selvam P
Department of Chemistry
Intellectual Property
- IITM IDF Number: 1958
- IP Patent Number: 398100 (Granted)
Technology Readiness Level
TRL – 4
Technology validation in Lab