Single and Binary Adsorption of Zn (II) and Cr (VI) Heavy Metals onto Synthesized Silica ‐Based MCM‐41

Abstract

Effluents from numerous Industries like textile, paint, pharmaceutical, steel and electroplating industries liberate both Zinc [Zn (II)] and Chromium [Cr (VI)] heavy metals. In this work, adsorptive interaction of toxic Zn (II) heavy metal in aqueous solution with synthesized mesoporous silica based MCM‐41 was investigated. Further, the effects of presence of Cr (VI) heavy metal on the adsorption of Zn (II) and vice versa were investigated by simultaneous competitive binary adsorption from Cr (VI) and Zn (II) aqueous binary solution. Batch experiments were executed to see the effects of parameters like pH, adsorbent dose (m), adsorbate concentration and adsorption time (t). Optimum conditions for Zn (II) treatment were obtained as: initial pH (pHi) =7, m=0.1 g/L and t=2 h. Competitive adsorption of both Cr (VI) and Zn (II) from their binary solution was studied at 288− 308 K temperatures. Obtained equilibrium data were then fitted to different competitive multicomponent isotherm models like Langmuir (extended), Freundlich isotherm (extended), Sheindrof‐Rebuhn‐Sheintuch (SRS) isotherm and Redlich‐Peterson isotherm (modified) models, and various isotherm interaction parameters were calculated.

Removal of heavy metals from binary and multicomponent adsorption systems using various adsorbents – a systematic review

“…41 (MCM-41), Zn( ii ), and Cr( vi ) ions were removed from single- and binary solute systems. 143 The Zn( ii ) and Cr( vi ) ions were effectively removed under the optimal working conditions of pH 7.00, 0.10 g L −1 adsorbent load and 2.00 h of contact time. It was found that raising the initial Zn( ii ) amount caused the uptake capacity of Zn( ii ) to improve, whereas increasing the Cr( vi ) concentration triggered the uptake capacity of Zn( ii ) to decrease.…”

Facile Preparation of Magnetic CuFe2O4 on Sepiolite/GO Nanocomposites for Efficient Removal of Pb(II) and Cd(II) from Aqueous Solution

“…Some of these methods had significant drawbacks, such as the production of sludge, high cost, or limited operational conditions. In contrast, the adsorption method seems to be one of the most practical choices because of its feasibility, low cost, and simple operation. , Thus, the synthesis of an adsorbent with a high affinity toward heavy metals removal was vastly investigated. , Many kinds of adsorbents, including carbon-based composites, activated carbon, nanoparticles, and clays, are used to remove heavy metals from wastewater. ,, …”

Production of hydroxyapatite‐based adsorbent for the removal of cobalt ions from the aqueous solution

“…Cobalt ions are naturally occurring hazardous metals found in numerous sewage and wastes from industrial effluent. The deleterious effects of this ion can lead to plants and animals deaths and many human body diseases 5,6 . The “World Health Organization‐Environmental Protection Agency” has recommended a permitted level of cobalt content of 15 μg/L in aquatic systems 7–15 .…”

“…The deleterious effects of this ion can lead to plants and animals deaths and many human body diseases. 5,6 The "World Health Organization-Environmental Protection Agency" has recommended a permitted level of cobalt content of 15 μg/L in aquatic systems. [7][8][9][10][11][12][13][14][15] Several methods have been used to recover and isolate heavy metal ions from multielement solution such as chemical treatments, ion changes, membrane processes, flocculation, and electrochemical, and adsorption techniques.…”