Nanosized Metal Oxide-Based Adsorbents for Heavy Metal Removal: A Review - Advanced Materials for Agriculture, Food and Environmental Safety - page 241

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Nanosized Metal Oxide-Based Adsorbents
for Heavy Metal Removal: A Review
Deepak Pathania* and Pardeep Singh
School of Chemistry, Faculty of Basic Sciences, Shoolini University,
Himachal Pradesh, India
Abstract
Nanosized metal oxides (NMOs) mediated adsorption has been the subject of
enormous studies related to water purii cation. h e NMOs, mainly ferric oxides,
manganese oxide and cerium oxides, provide high surface area and specii c ai n-
ity for heavy metal adsorption from aqueous phase . Recently, new NMOs-based
adsorbents development, characterization and evaluation of adsorption ability
under varying experimental conditions are hot topics for researchers. h e heavy
metal adsorption mechanism has been explored on the basis of modern analytical
techniques (SEM, TEM, XRD, FTIR, XPS, NMR, etc.). h is review mainly illus-
trates various methods of preparing NMOs, their physicochemical properties,
adsorption properties and applicability for heavy metal removal from aqueous
phase. Magnetic NMOs have also been included, owing to their unique separation.
Also presented are some porous material supported NMOs and NMO-based bio-
nanocomposites, which are of importance due to their practical utility. Despite the
many absorbents explored, various issues such as nanoparticle aggregation, reus-
ability, larger size and nanotoxicity need to be discussed and resolved for highly
ei cient adsorption processes.
Keywords : Heavy metals, nanosized metal oxides, water treatment, hybrid
adsorbent