Implications for Zinc Dissolution and Arsenite Adsorption in Water
In the recent past, intensive studies have been directed towards the use of zinc oxide nanoparticles
(ZnO-NPs) for pollutant uptake and pathogens deactivation from water. However, the chemical
behaviour of these suspended colloids in water and their solubility measurements is still not fully
understood. Herein, a green synthesis approach was used to fabricate surface-modified ZnO-NPs
using Dracaena cinnabari (Dragon’s blood) extract. A ZnO control sample for comparison was synthesized
at similar conditions but without the extract. The obtained powder samples were characterized
for structural, morphological and surface properties using various multidisciplinary tools. The environmental
stability and adsorption behaviour of surface-modified ZnO-NPs (S1) and pristine ZnO (S2)
were studied in aqueous solution at various conditions. S1 sample showed high adsorption capacity
for Arsenite (As (III)) and least leaching of Zn ions into water as compared with S2. The results of Zn
ions leaching into water (in case of S2) inferred that pristine ZnO sample (S2) was unstable in alkaline
and acidic conditions, suggesting its unviability as an adsorbent in most conditions. However, the
green synthesis approach for the synthesis of ZnO-NPs has proved a potential step forward towards
the safe use of ZnO-NPs for water purification systems.
20% iron catalysts supported on combined alumina and silica through different proportions (Al2O3:SiO2:
100:0.00, 90.0:10.0, 80.0:20.0 and 0.0:100.0) were tested for the catalytic…
A novel approach to the in situ regeneration of a spent alumina-supported cobalt–iron
catalyst for catalytic methane decomposition is reported in this work. The spent catalyst was
…