Photocatalytic TiO₂ requires high-purity rutile ore or synthetic TiCl₄ (chloride process) — trace iron and sulfate contamination from the sulfate route quench photocatalytic activity. China supplies ~58% of global TiCl₄ capacity. Australian rutile exports and South African mineral sands underpin the non-China chloride route for supply diversification.
Technical Specifications
| Supply Chain Stage | Key Inputs | Dominant Geography | Constraint |
|---|---|---|---|
| Feedstock mining | Ilmenite, rutile ore | Australia, South Africa, China, Norway | Grade quality, ESG permitting |
| TiCl₄ synthesis | Rutile + coke + Cl₂ | China (58% capacity), USA, Germany | Chlorine availability, energy cost |
| Photocatalytic TiO₂ synthesis | TiCl₄, controlled calcination | China, Japan (Ishihara), Germany (Evonik) | Crystal phase control |
| Formulation / dispersion | Surface treatment, milling | Regional formulators (EU, US, SEA) | Agglomeration, coating compatibility |
Price Dynamics: SEMITECH vs. Evonik P25
Evonik Aeroxide P25 commands a premium due to brand recognition and ISO-reference status. SEMITECH's P25-equivalent grade is priced 40–60% below Evonik at comparable quantities, with 15–25 day lead times (FOB Tianjin/CIF) versus 4–8 weeks for Evonik.
| Parameter | Evonik Aeroxide P25 | SEMITECH Photocatalytic TiO₂ |
|---|---|---|
| Anatase/Rutile ratio | ~80/20 | ~80/20 |
| Primary particle size | ~21 nm | ~25 nm |
| BET surface area | 50 ± 15 m²/g | 50 ± 10 m²/g |
| TiO₂ purity | >99.5% | ≥99% |
| Indicative price (1 MT+) | USD 25–35/kg | USD 10–18/kg |
| Lead time (to Asia) | 4–8 weeks | 15–25 days |
| ISO 10678 data available | Yes (reference standard) | Available on request |
▶Show full content (2 sections)
Applications
Self-cleaning coatings — TiO₂ loading 2–5 wt% in aqueous acrylic or sol-gel binders; largest volume segment (~40–45% of photocatalytic TiO₂ consumption).
Air purification media — Gas-phase VOC degradation (toluene, formaldehyde); typical loading 1–3 g/m² on filter substrate.
Photocatalytic water treatment — Slurry reactors (0.5–2 g/L) or immobilized thin-film reactors targeting pharmaceutical micropollutants and E. coli inactivation. Fastest-growing sub-segment at ~12% CAGR.
Frequently Asked Questions
+Q: What makes SEMITECH TiO₂ a P25 equivalent?
A: It matches P25's defining parameters: 80/20 anatase/rutile phase ratio, ~25 nm primary particle size, and BET ~50 m²/g. Confirm equivalence via methylene blue degradation kinetics (ISO 10678) on received lots.
+Q: What is the difference between anatase and rutile in photocatalysis?
A: Anatase (3.2 eV) is the active phase, generating hydroxyl radicals under UV-A. Rutile at 20% forms a heterojunction that slows electron-hole recombination, increasing net ROS output. Pure anatase or pure rutile both perform worse than the 80/20 blend.
+Q: Can this be used in waterborne coating systems?
A: Yes. The material is hydrophilic and disperses in aqueous systems at pH 4–9. For stable dispersions above 5 wt%, use a dispersant (polyacrylic acid sodium salt, 0.5–1 wt% on TiO₂). Surface-treated hydrophobic variants are available for solvent-borne systems.
+Q: How does pricing compare to standard pigmentary TiO₂?
A: Photocatalytic TiO₂ costs 5–15x more than pigmentary grade ($2–4/kg) due to tighter crystal phase control and smaller particle size. SEMITECH at $10–18/kg targets the industrial sweet spot below Evonik P25 ($25–35/kg).
+Q: What are the key supply chain risks?
A: TiCl₄ feedstock concentration in China (~58%), where energy shocks or environmental shutdowns tighten supply with 4–6 week lag. Request BET and XRD phase composition per lot, and consider dual qualification across Chinese and non-Chinese sources.
+Q: Is it suitable for antimicrobial applications?
A: The base grade shows UV-activated antimicrobial activity against E. coli and S. aureus. For visible-light activation, see our silver-doped Ag-TiO₂ product page.
+Ready to optimise your formulation?
Contact the Semitech technical team for product recommendations, samples and TDS.