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Removal of copper(II) ions from Aqueous Media by Chemically Modified MCM‐41 with N ‐(3‐(trimethoxysilyl)propyl)ethylenediamine and Its 4‐hydroxysalicylidene Schiff‐base
Author(s) -
Saad Eman M.,
Hassan Hassan M.A.,
Soltan Mohamed S.,
Butler Ian S.,
Mostafa Sahar I.
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12771
Subject(s) - adsorption , chemistry , aqueous solution , ethylenediamine , mcm 41 , desorption , langmuir adsorption model , sorption , copper , nuclear chemistry , schiff base , inorganic chemistry , langmuir , sorbent , mesoporous silica , mesoporous material , polymer chemistry , organic chemistry , catalysis , molecular sieve
The adsorption capacities of mesoporous silica modified with N‐(3‐(trimethoxysilyl)propyl)ethylenediamine (MCM‐41‐NH 2 ) and its 4‐hydroxysalicylidene Schiff‐base, MCM‐41‐N‐Hdhba, as sorbents for removal and recovery of copper(II) ions from aqueous media have been investigated. The sorption uptake is highly dependent on the pH, contact time, temperature, diverse ions, mass of sorbent as well as initial Cu(II) ions concentration. At pH 6, the two sorbents, MCM‐41‐NH 2 and MCM‐41‐N‐Hdhba, show 96.4% and 99.9% Cu(II) ions removal, respectively. Langmuir isotherm gave the best fit of the experimental data with maximum adsorption capacities 138.8 and 222.2 mg g −1 for MCM‐41‐NH 2 and MCM‐41‐N‐Hdhba, respectively. The uptake kinetics were modeled using a pseudo‐second‐order rate equation and the thermodynamic parameters (ΔH°, ΔG° and ΔS°) verified favorable, spontaneous, and exothermic for MCM‐41‐NH 2 and endothermic for MCM‐41‐N‐Hdhba adsorption processes. Successive adsorption–desorption studies indicated that MCM‐41‐NH 2 and MCM‐41‐N‐Hdhba maintain their adsorption and desorption efficiencies constant over five cycles. Of particular importance is the fact that MCM‐41‐NH 2 and MCM‐41‐N‐Hdhba were able to remove 95% of Cu(II) ions from polluted river and tap water. The structures and physicochemical properties of the sorbents before and after adsorption of Cu(II) ions were characterized by using spectroscopic (FTIR and XRD), morphological (TEM‐EDX), thermal, elemental analysis, and magnetic susceptibility measurements. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 746–760, 2018