吸附
纳米孔
水溶液
化学工程
多孔性
材料科学
粒子(生态学)
微型多孔材料
预聚物
粒径
纳米颗粒
分散性
色散(光学)
三聚氰胺树脂
化学
高分子化学
复合材料
有机化学
纳米技术
聚氨酯
工程类
地质学
物理
光学
海洋学
涂层
作者
Konstantin B. L. Borchert,Niklas Gerlach,Christine Steinbach,Berthold Reis,Simona Schwarz,Dana Schwarz
标识
DOI:10.1016/j.jcis.2023.01.071
摘要
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.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.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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