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Highly efficient phosphate adsorption using calcium silicate hydrate-embedded calcium crosslinked polyvinyl alcohol
Worawit Wongniramaikul1, Bussakorn Kleangklao1, Fatemeh Sadegh1
1Integrated Science and Technology Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket, 83120, Thailand.
Environmental Research
|October 25, 2024
Summary
A new calcium silicate hydrate-polyvinyl alcohol (CSH-PVA) film effectively removes phosphate from water, preventing eutrophication. This environmentally friendly material shows high adsorption capacity and potential for fertilizer applications.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment
Background:
- Eutrophication caused by phosphate pollution necessitates effective water remediation strategies.
- Developing sustainable and efficient phosphate removal methods is crucial for environmental protection.
Purpose of the Study:
- To develop a novel composite film for efficient phosphate removal from water.
- To investigate the adsorption characteristics and mechanism of the developed film.
Main Methods:
- A composite film of calcium silicate hydrate (CSH) immobilized within calcium cross-linked polyvinyl alcohol (CSH-PVA) was synthesized.
- Characterization of the film and phosphate adsorption experiments were conducted under various conditions.
- Adsorption kinetics and isotherm models were applied to analyze the data.
Main Results:
- The CSH-PVA film demonstrated a maximum phosphate removal capacity of 99.01 mg g⁻¹.
- Phosphate adsorption followed pseudo-second-order kinetics and the Langmuir isotherm model, indicating chemisorption.
- The film achieved excellent removal efficiencies (72.06%-97.87%) in real water samples, with some interference from fluoride and carbonate ions.
Conclusions:
- The developed CSH-PVA composite film is a promising material for efficient phosphate removal from water.
- The adsorption process is endothermic, spontaneous, and driven by chemisorption.
- The film's potential application extends to fertilizer production, offering a dual benefit.
