Green production of silica nanoparticles from maize stalk
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Date
2019
Authors
Adebisi, J. A.
Agunsoye, J. O.
Bello, S. A.
Haris, M.
Ramakokovhu, M. M.
Daramola, M. O.
Hassan, S. B.
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis
Abstract
Amorphous silica has been produced from some agricultural wastes but with drawbacks on
agglomeration challenges. In the present study, potential of maize stalk (MS) wastes as a source of
nano silica was studied through modified sol-gel techniques, which involved acid pretreatment,
calcination, leaching, sol-gel modification, and post-filtration treatments. Nano silica particles
obtained were characterized by XRD, SEM, EDS, TEM, PSA, Raman, and FT-IR for morphology, elemental
composition, particle size, and surface chemistry. Results obtained revealed that pre-calcination
acid treatment of the MS did not improve the silica yield but reduced the Van der Waal’s
interaction of the silica particles resulting in silica particles with a smaller degree of agglomeration.
Sodium silicate modified with ethylene glycol sol-gel treatment prior to titration reduced silica
agglomeration. Silica nanoparticles obtained according to XRD, TEM, and PSA are below 30 nm.
Description
Keywords
morphology, agglomeration, nanoparticle, Maize stalk, silica