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Authors
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Borchert, K. ; Gerlach, N. ; Steinbach, C. ; Reis, B. ; Schwarz, S. ; Schwarz, D.
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Title
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SiO2 nanospheres as surfactant and template in aqueous dispersion polymerizations yielding highly nanoporous resin particles
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Date
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18.01.2023
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Number
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61454
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Abstract
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Hypothesis: High nitrogen containing resins such as poly(melamine-co-formaldehyde) (PMF) are known for their very good adsorption properties. Until now, using an ecofriendly hard-templating approach with SiO2 nanospheres in water for synthesis, only yielded either highly porous particles with diameters up to 1 µm or non-porous particles with diameters above 1 µm. Small particles cannot be used as fixed bed adsorbents in columns because of the very high pressure occurring. Experiments: To yield particles with high porosity and larger diameters for the use as fixed bed adsorbent, we investigated the influence of several synthesis parameters on porosity and particle morphology. Findings: From all variations, we proposed a mechanism for the complex interplay between the PMF prepolymer and resin species with SiO2 nanoparticles acting both as Pickering-like surfactant and template particle. With this knowledge we were able to produce a suitable column material with high specific surface area up to 260 m2/g. We then proved the application of this material for aqueous dichromate adsorption in batch, yielding a maximum capacity of 138 mg/g with recyclability. In column experiments, the contamination of 5 mg/L dichromate in water was reduced to drinking water safe levels for an influent volume equal to over 160 bed volumes.
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Publisher
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Journal of Colloid and Interface Science
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Wikidata
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Citation
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Journal of Colloid and Interface Science 637 (2023) 372-388
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DOI
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https://doi.org/10.1016/J.JCIS.2023.01.071
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