Cerium oxide nanoparticles were loaded onto aminated lignin to make a phosphate sorbent for water treatment. The material removed phosphate efficiently, and leaching tests across pH 4 to 9 found only small amounts of cerium released into the water.
Key numbers
- Cerium released during phosphate adsorption: 0.021, 0.015, 0.028, 0.056, 0.025 and 0.062 mg/L at pH 4, 5, 6, 7, 8 and 9, equal to 0.0062% to 0.0258% of the cerium loaded (Section 3.8, p. 10).
- Phosphate adsorption capacity 27.86 mg/g (abstract).
Methods (brief)
In situ precipitation of cerium oxide on aminated lignin; bench-scale adsorption, regeneration and leaching tests with instrumental cerium analysis.
Evidence fitness
Off-topic for dietary exposure. The leaching figures show that cerium-based water treatment sorbents can release small amounts of cerium into treated water, but the paper does not support dietary exposure or toxicity claims.
Limitations
Laboratory material or biomedical study; no environmental, food or human exposure measurements.
Related evidence
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