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Utilization of biosynthesized silica-supported iron oxide nanocomposites for the adsorptive removal of heavy metal ions from aqueous solutions
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Utilization of biosynthesized silica-supported iron oxide nanocomposites for the adsorptive removal of heavy metal ions from aqueous solutions
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Journal Article
Utilization of biosynthesized silica-supported iron oxide nanocomposites for the adsorptive removal of heavy metal ions from aqueous solutions
2023
Overview
This study deals with heavy metal ions removal from simulated water using biosynthesized silica-supported iron oxide nanocomposites (nano-IOS). Agricultural and garden wastes have been utilized to prepare nano-IOS through a green synthesis process. Nano-IOS was characterized by XRD, SEM, FTIR, and zeta potential analysis. The nanocomposites were used to remove five heavy metals, viz., Pb
2+
, Cd
2+
, Ni
2+
, Cu
2+
, and Zn
2+
, with optimization of reaction parameters including pH, the concentration of heavy metals, adsorbent dosage, and contact time in batch mode experiments. The optimized dose of nano-IOS was 0.75 g/L for the adsorption of Pb
2+
, Cd
2+
, Ni
2+
, Cu
2+
, and Zn
2+
(10.0 mg/L) with a contact duration of 70 min at pH 5.0 for Pb
2+
, Cd
2+
, and Cu
2+
and 6.0 for Ni
2+
and Zn
2+
. The adsorption behavior of the nano-adsorbent was well described by Langmuir adsorption isotherm and pseudo-second-order kinetic model indicating chemisorption on the surface of nano-IOS. The adsorption was also found spontaneous and endothermic. Thus, the environmentally benign and bio-synthesized nano-IOS can be utilized as an effective nano-adsorbent for the rapid sequestration of heavy metal ions from water and wastewater.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Advances in Water and Wastewater Technologies for Remediation of Contaminants of Emerging Concern
/ Cadmium
/ Copper
/ Earth and Environmental Science
/ gardens
/ kinetics
/ Lead
/ Silica
/ Waste Disposal, Fluid - methods
/ Water Pollutants, Chemical - analysis
/ Water Pollutants, Chemical - chemistry
/ Water Purification - methods
/ Zinc
