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AuthorKhan, Mariam
AuthorAl- Ghouti, Mohammad A.
AuthorKhraisheh, Majeda
AuthorShomar, Basem
AuthorHijji, Yousef
AuthorTong, Yongfeng
AuthorMansour, Said
AuthorNasser, Mustafa Saleh
Available date2023-05-16T09:07:32Z
Publication Date2023
Publication NameEnvironmental Research
ResourceScopus
ISSN139351
URIhttp://dx.doi.org/10.1016/j.envres.2023.116024
URIhttp://hdl.handle.net/10576/42789
AbstractThis study aims to prepare an ion-imprinted polymer (IIP) using copper sulfate as a template and potassium persulfate as an initiator to selectively adsorb copper ions (Cu2+) from aqueous solutions and in an attempt to also test its applicability for removing strontium ions (Sr2+). The prepared polymer was denoted by IIP-Cu. Various physical and chemical characterizations were performed for the prepared IIP-Cu. The scanning electron microscopy and transmission electron microscopy analyses confirmed the cavities formed after the removal of the template. It also indicated that the IIP-Cu had a rough and porous topology. The X-ray photoelectron spectroscopy confirmed the successful removal of the Cu template from IIP-Cu. The Brunauer-Emmet-Teller revealed that the surface area of IIP-Cu is as high as 152.3 m2/g while the pore radius is 8.51 nm. The effect of pH indicated that the maximum adsorption of Cu2+ was achieved at pH 8 with 98.7%. Isotherm studies revealed that the adsorption of Cu2+ was best explained using Langmuir models with a maximum adsorption capacity of 159 mg/g. The effect of temperature revealed that an increase in temperature had an adverse impact on Cu2+ removal from the aqueous solution, which was further confirmed by thermodynamic studies. The negative value of standard enthalpy change (−4.641 kJ/mol) revealed that the adsorption of Cu2+ onto IIP-Cu was exothermic. While the continuous increase in Gibbs free energy from −6776 kJ/mol to −8385 kJ/mol with the increase in temperature indicated that the adsorption process was spontaneous and feasible. Lastly, the positive value of the standard entropy change (0.023 J/mol.K) suggested that the Cu2+ adsorption onto IIP-Cu had a good affinity at the solid-liquid surface. The efficiency of the prepared IIP-Cu was also tested by studying the adsorption capacity using Sr2+ and real brine water. The results revealed that IIP-Cu was able to remove 63.57% of Sr2+ at pH 8. While the adsorption studies revealed that the experiment was best described using the Langmuir model with a maximum adsorption capacity of 76.92 mg/g. Additionally, IIP-Cu was applied in a real brine sample, which consisted of various metal ions. The highest percentage of Cu2+ removal was 90.6% and the lowest was 65.63% in 1:4 and 1:1 brine ratios, respectively. However, this study indicates the successful application of IIP-Cu in a real sample when it comes to the effective and efficient removal of Cu2+ in a solution consisting of various competing ions.
SponsorThis work was made possible by Qatar University collaborative internal grant # [ QUCG-CAS-20/21-2 ]. The findings achieved herein are solely the responsibility of the authors. The FTIR, ICP, SEM, and TEM analyses were accomplished in the Central Laboratories unit, Qatar University. QEERI Core Labs are greatly acknowledged for XPS analytical support and fruitful discussions.
Languageen
PublisherElsevier
SubjectAdsorption
Ion-imprinted polymer
Metals ions
Selectivity
Wastewater treatment
TitleSynthesis of nanostructured novel ion-imprinted polymer for selective removal of Cu2+ and Sr2+ ions from reverse osmosis concentrated brine
TypeArticle
Volume Number231
dc.accessType Abstract Only


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