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A simple preparation route for polysilicate titanium salt from spent titanium solutions.
Bin Xu1, Yingjie Zhang1, Xue Li1
1National and Local Joint Engineering Laboratory for Lithium-Ion Batteries and Materials Preparation Technology, Kunming 650093, China; Key Laboratory of Advanced Battery Materials of Yunnan Province, Kunming 650093, China; and Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Polysilicate titanium salt (PST), synthesized from waste, effectively treats wastewater. This eco-friendly flocculant enhances aggregation and stabilizes titanium salts for high turbidity and COD removal.
Area of Science:
- Materials Science
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Spent titanium solutions and polysilicic acid (PSiA) are utilized for synthesizing polysilicate titanium salt (PST).
- PSiA enhances flocculant aggregation and stabilizes titanium salts by inhibiting Ti4+ hydrolysis.
- Utilizing spent titanium solutions offers cost reduction and addresses industrial wastewater challenges, enabling waste valorization.
Purpose of the Study:
- To synthesize and characterize polysilicate titanium salt (PST) using waste materials.
- To investigate the influence of Ti/Si molar ratios on PST morphology and flocculation performance.
- To evaluate PST's efficacy in treating humic-kaolin water and actual domestic wastewater.
Main Methods:
- Synthesis of PST from spent titanium solutions and PSiA.
- Morphological analysis using Scanning Electron Microscopy (SEM).
- Formation process analysis via Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray Photoelectron Spectroscopy (XPS).
- Flocculation performance evaluation using humic-kaolin water and real wastewater, with in situ floc size measurement by laser particle size analyzer.
Main Results:
- PST exhibited morphology transformations (sheet, spheroid, sphere) dependent on Ti/Si molar ratios.
- PST demonstrated effective flocculation and sedimentation in both synthetic and real wastewater.
- The study confirmed PST's suitability for treating high turbidity and COD wastewater across a broad pH range.
Conclusions:
- The developed PST is a cost-effective and environmentally friendly flocculant derived from industrial waste.
- PST shows excellent performance in turbidity and COD removal, making it suitable for diverse wastewater treatment applications.
- This research highlights the potential for valuable waste regeneration in the titanium industry.
