ISSN : 2663-2187

Adsorption of heavy metal ions from waste water via using the application of metallic oxides

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Gajendra Singh Lodhi, Jyoti Sharma, Laxman Singh
» doi: 10.33472/AFJBS.6.5.2024. 2291-2304

Abstract

Presently, there is increased attention and focus on addressing issue relevant to heavy metals toxic effects discharge in an aqueous environment. The objective of current research work is to identify most suitable adsorbent among zinc oxide (ZnO), titanium oxide (TiO2), and aluminum oxide (Al2O3), utilized for the efficient removal of lead (Pb2+) ions from waste water streams through the adsorption process.In this context, syntheticZnO demonstrated superior performance in lead uptake, followed by TiO2 andAl2O3. The employed adsorbents were also subjected to characterizations through SEM, EDX-spectra analysis to examine the surface morphology and chemical composition of the adsorbents. The surface and elemental modification ensure maximal adsorption of toxic (Pb2+) ions from waste water streams is achieved. To ensure a good adsorption practice of adsorbents for (Pb2+) ion, various physiochemical parameters such as solution pH, adsorbent dosage, contact time, initial concentrations and temperature were systematically explored. The optimal conditions for achieving a 100ppm (Pb2+) ion removal efficiency were recorded at pH 7.0, 2.0 g/l of adsorbent dose at 41°C for 120mins, respectively. Under these optimal conditions, theestimated optimal removal efficiencies for ZnO,TiO2 andAl2O3 were 98.43%, 96.45%, and 85.50%, respectively. Furthermore, adsorption kinetics were explored to remove Pb2+ ion and it was observed that the pseudo-second-order provided the best fittedmodel with a correlation coefficient (r2 ≥ 0.96). Based on the data obtained this study confirms that ZnO exhibits higher potential for Pb2+ ion uptake on a commercial scale. This potential makes it a valuable candidate for environmental remediation in industrial effluent treatment, addressing the need to purify contaminated water streams.

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