Magnetite nanoparticles made by the co-precipitation method or using commercially available magnetite nano-particles were coated with silica by reaction with tetraethyl orthosilicate (TEOS). The TEOS coated particles were then treated with a mixture of methyltrimethoxysilane (MTMS) and chloropropyltrimethoxysilane (CPTMS) to provide an organic surface to which a polymeric amine could be grafted. The resulting inorganic-organic hybrid nanoparticles were then used to capture metals such as Cu, Zn. Mn and Hg. Metal capacities were quite good being ≥0.5 mmolg-1. The particles could be magnetically recovered, stripped, regenerated and used many times over without significan loss of loss of capacity. The particles were characterized by DLS, TEM, elemental analysis and infrared spectroscopy. Adsorption was well modeled by the Langmuir adsorption isotherm and TEM clearly showed core-shell nature of their structure. The particles were designed for use in a continuous flow doubly looped reactor equipped with electromagnets to capture the particle after adsorption and after metal removal and particle regeneration. Operation of the reactor and use of the particles in the reactor on waste streams will be presented.

Core-shell Fe-SiO2-polyamine magnetic nanoparticles for metal recovery using a continuous flow pipeline reactor

2019 Fall National Meeting

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