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Filtration of polystyrene nanoplastics with different functional groups by natural mineral materials: Performance and mechanisms
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Researchers tested natural granular mineral materials including manganese sand, zeolite, and limestone as filter media for removing polystyrene nanoplastics with different surface functional groups from water. The study assessed which minerals perform best in rapid sand filters for nanoplastic removal under varying water chemistry conditions.
Optimizing nanoplastics (NPs) removal performance of rapid sand filter (RSF) in water treatment plants is significant for NP pollution prevention and remediation. This study investigated the application prospect of natural granular manganese sand, zeolite and limestone in RSF for NP removal through column experiments. Pristine, amino-modified, and carboxyl-modified polystyrene NPs (100 nm) were selected as experimental subjects. Quartz sand filter showed negligible NP removal, zeolite and manganese sand showed no obvious optimization on NP filtration. Limestone amended RSF significantly enhanced the removal of three NPs, the removal efficiency increased with decreasing size and increasing limestone grains dosage. The excellent performance of limestone was attributed to its special physicochemical properties in terms of synthetical action of electrostatic interaction, cationic bridging and especially the surface roughness morphology, and the mechanisms overcame the influence of functional groups of NPs. The results indicate the prospective applications of granular limestone in RSF for NP filtration.
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Researchers found that adding granular limestone to sand filtration systems significantly improved removal of polystyrene nanoplastics from both deionized and wastewater, with calcium ions from the limestone enhancing particle aggregation and retention in filter media.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.