Green chemistry
Green IONP synthesis still spends ethanol and electricity
Open access · cc by · source: Europe PMC
A cradle-to-gate LCA of 1 g iron oxide nanoparticles finds lemongrass synthesis greener than NaOH coprecipitation, but ethanol washes and lab electricity still dominate both inventories.
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Green IONP synthesis still spends ethanol and electricity
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What two IONP routes were compared by LCA?
This study reports the LCA of the green synthesis of IONPs using C. citratus extract and the Na 2 CO 3 stabilizing agent.
Key findings
Marine aquatic ecotoxicity is the largest normalised impact (1.2×10−8 coprecipitation vs 7.6×10−10 green). Ethanol contributes 42% vs 84% and electricity ~99% vs 83% in key categories. Green synthesis still wins every category but is not impact-free.
Methodology
Authors synthesised IONPs from Cymbopogon citratus extract/Na2CO3 versus Fe(II/III)/NaOH coprecipitation, then ran CML-IA LCA (ISO 14040/14044) for a 1 g functional unit, plus electricity-sensitivity scenarios.
Limitations
Lab-scale LCA with assumed 100% Fe conversion and discarded ethanol; it is not a plant-scale, solvent-recovery process inventory.
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