Adsorptive removal of copper (II) ions from aqueous solution by silane cross-linked chitosan/PVA/TEOS beads: kinetics and isotherms

Kamal, Muhammad Arif; Yasin, Tariq; Reinert, Laurence; Duclaux, Laurent

doi:10.1080/19443994.2014.991761

Cited by 13 publications

(5 citation statements)

References 34 publications

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“…At low pH (pH < 6.3), the amine groups of the CTPP beads begin to protonate, producing electrostatic repulsion of the cations under study and competition between protons and cations at the adsorption sites, which explains the reduction in the cation adsorption capacity of the CTPP beads. At pH values higher than 5.6, the Cu(II), Cd(II), Pb(II), and Zn(II) ions begin to form hydroxides; specifically, Cu(OH) 2 , Cd(OH) 2 , Zn(OH) 2 , and Pb(OH) 2 start to appear at pH values of 5.6, 7.0, 7.8, and 6.5, respectively . Thus, it is possible to conclude that pH 5 is the optimum value for cation adsorption by the CTPP beads.…”

Section: Resultsmentioning

confidence: 95%

Metal ion sorption by chitosan–tripolyphosphate beads

Giraldo

Rivas

Elgueta³

et al. 2017

J of Applied Polymer Sci

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Heavy metal removal from wastewater is crucial for the proper management of discharged water from mining operations. This residual water is typically unusable for other purposes such as for human/animal, crop, or industrial consumption. Eco‐friendly adsorption materials are necessary to ensure the sustainable treatment of this wastewater. Therefore, the sorption of Cu(II), Cd(II), Pb(II), and Zn(II) ions onto chitosan–tripolyphosphate (CTPP) beads was investigated using real mining wastewater and prepared ion metal solutions. The effects of pH, contact time, temperature, selectivity, and maximum sorption capacity in successive batches at different concentrations were studied. The optimum sorption of cations, except for copper (pH 3) was found at pH 5. Equilibrium in the adsorption of all metals was reached at 24 h of contact. Studies of the maximum sorption capacity at different concentrations showed that the CTPP beads could adsorb 158, 55, 47, and 47 mg/g of Pb(II), Cu(II), Cd(II), and Zn(II), respectively. Experimental data for the sorption of Pb(II) were optimally correlated with the Langmuir model. The thermodynamic parameters such as the changes in enthalpy (ΔH0), entropy (ΔS0), and free energy (ΔG0) were determined. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45511.

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Section: Resultsmentioning

confidence: 95%

Metal ion sorption by chitosan–tripolyphosphate beads

Giraldo

Rivas

Elgueta³

et al. 2017

J of Applied Polymer Sci

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“…b), the impactful peak of alcohol, resulting from the stretching vibration of hydroxyl groups (O–H), was observed in the range of 3200 to 3500 cm –1 . Two apparent peaks at 2937 and 849 cm –1 could be credited to the asymmetric stretching mode of CH and CH 2 as well as the rocking mode of C–H in the PVA spectrum . The sharp peak at the wavelength of 1052 cm –1 might have corresponded to the stretching vibration of the C–O group .…”

Section: Resultsmentioning

confidence: 94%

“…Two apparent peaks at 2937 and 849 cm −1 could be credited to the asymmetric stretching mode of CH and CH 2 as well as the rocking mode of C−H in the PVA spectrum. 37 The sharp peak at the wavelength of 1052 cm −1 might have corresponded to the stretching vibration of the C−O group. 38 In the CS/PVA spectrum (Figure . 1C), it has been hypothesized that the wide peak at 3100−3500 cm −1 may have been caused by the overlap of stretching vibrations of the −NH group from CS and the hydroxyl group from PVA polymeric chains.…”

Section: Resultsmentioning

confidence: 99%

Metformin-Embedded Biocompatible Chitosan/Poly(vinyl alcohol) Beads with Superior Adsorption Properties toward Lead(II) and Levofloxacin

Ramsheh

Dogari

Mosaffa

et al. 2023

ACS Appl. Polym. Mater.

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In this contemporary era, chitosan has gained exceptional attention as a sustainable biopolymer in the adsorption process due to its nontoxic nature, biocompatibility, accessibility, and pH-responsive active surface charge. This study developed a high-performance chitosan/poly(vinyl alcohol) adsorbent through metformin functionalization. The incorporation of poly(vinyl alcohol) (PVA), along with the metformin-activated surface, remarkably ameliorated its physiochemical properties. The abundance of inter-and intrahydrogen and chemical bonds in the porous structure enhances the specific surface area up to 83.8 m 2 /g. Series characterization methods are utilized to investigate the adsorbents' characteristics in all aspects and the removal performance. Furthermore, the key factors for the adsorption process, including the influence of pH, adsorbent quantity, time intervals, and preliminary concentration, were studied and optimized. The optimal pH was observed in the neutral moiety, which is crucial from an industrial perspective. Due to the presence of countless nitrogen and oxygen atom-containing backbones, the CS/ PVA-Pr-Met biocomposite has demonstrated considerable adsorption capacity toward Pb(II) ions and levofloxacin with the highest adsorption capacities of 313.162 mg/g for Pb(II) and 2872.927 mg/g for levofloxacin concerning their molecular and ionic nature and various adsorption mechanisms. In accordance with the correlation coefficient and estimated parameters, the adsorption of Pb(II) and levofloxacin onto the beads mostly follows the pseudo-second-order kinetics (R 2 ≥ 0.997) and the Langmuir adsorption isotherm model (R 2 ≥ 0.995). The exceptional adsorption capacity coupled with the porous structure of the modified hydrogel beads has promising applications for efficient wastewater treatment

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“…The Langmuir isotherm theory is based on the assumption that adsorption occurs at specific homogeneous sites inside and sorption sites possess equal sorption affinity for adsorbate. In addition, once a metal ion molecule resides a site, no additional sorption can take place there (Kamal et al 2016;. The isotherm is represented be the formulation below.…”

Section: Sorption Equilibrium Isothermsmentioning

confidence: 99%

“…In the midst of used adsorbents, hydrogels have been classified as one of the most suitable material for the removal of heavy-metal ions from aqueous solutions (Antic et al, 2015;Soto et al, 2015;Wang and Li, 2015). Hydrogels, as previously defined in the literature, are 3D crosslinked polymeric material with the ability to retain high level of water and remain insoluble due to the existence of physical or chemical crosslinking in the material's network structure Kamal et al, 2016;Yildiz et al, 2010). Stimuli-responsive hydrogels have shown great applicability in different areas of research such as sensors materials, drug delivery, tissue engineering and wastewater treatments.…”

Section: Introductionmentioning

confidence: 99%

A response surface modelling study for sorption of Cu²⁺, Ni²⁺, Zn²⁺ and Cd²⁺ using chemically modified poly(vinylpyrrolidone) and poly(vinylpyrrolidone-co-methylacrylate) hydrogels

Kemik

Ngwabebhoh

Yıldız

2016

Adsorption Science & Technology

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In this present study, response surface methodology was applied for the optimization and evaluation of different heavy-metal sorption processes. Poly(vinylpyrrolidone) and poly(vinylpyrrolidone-comethylacrylate) hydrogels were used as pH-responsive adsorbents to investigate their efficiency in the uptake of Cu 2þ , Ni 2þ , Zn 2þ and Cd 2þ metal ions from aqueous solution in a batch reactor system. The effect of operational parameters such as initial pH and contact time were studied using central composite design. Analysis of variance depicted the central composite design model was significant for Cu 2þ , Ni 2þ , Zn 2þ and Cd 2þ metal ions removal by the investigated hydrogels. A comparison between the model results and experimental data showed that poly(vinylpyrrolidoneco-methylacrylate) possessed higher metal ions binding affinity than poly(vinylpyrrolidone) hydrogel. The heavy-metal ions sorption kinetic well fitted the pseudo second-order kinetic model. Evaluation of the intraparticle diffusion model suggested the sorption process occurred in two phases: surface sorption and intraparticle diffusion. Isothermic results revealed that Freundlich and Temkin isotherms best described the adsorbate-adsorbent interactions. Maximum sorption capacities were observed for Cu 2þ ion and were determined as 86.66 mg/g and 98.53 mg/g for poly(vinylpyrrolidone) and poly(vinylpyrrolidone-co-methylacrylate) hydrogels, respectively.

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Adsorptive removal of copper (II) ions from aqueous solution by silane cross-linked chitosan/PVA/TEOS beads: kinetics and isotherms

Cited by 13 publications

References 34 publications

Metal ion sorption by chitosan–tripolyphosphate beads

Metal ion sorption by chitosan–tripolyphosphate beads

Metformin-Embedded Biocompatible Chitosan/Poly(vinyl alcohol) Beads with Superior Adsorption Properties toward Lead(II) and Levofloxacin

A response surface modelling study for sorption of Cu²⁺, Ni²⁺, Zn²⁺ and Cd²⁺ using chemically modified poly(vinylpyrrolidone) and poly(vinylpyrrolidone-co-methylacrylate) hydrogels

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Adsorptive removal of copper (II) ions from aqueous solution by silane cross-linked chitosan/PVA/TEOS beads: kinetics and isotherms

Cited by 13 publications

References 34 publications

Metal ion sorption by chitosan–tripolyphosphate beads

Metal ion sorption by chitosan–tripolyphosphate beads

Metformin-Embedded Biocompatible Chitosan/Poly(vinyl alcohol) Beads with Superior Adsorption Properties toward Lead(II) and Levofloxacin

A response surface modelling study for sorption of Cu2+, Ni2+, Zn2+ and Cd2+ using chemically modified poly(vinylpyrrolidone) and poly(vinylpyrrolidone-co-methylacrylate) hydrogels

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A response surface modelling study for sorption of Cu²⁺, Ni²⁺, Zn²⁺ and Cd²⁺ using chemically modified poly(vinylpyrrolidone) and poly(vinylpyrrolidone-co-methylacrylate) hydrogels