Removal of Ag(I) from aqueous solution by thiourea-functionalized silica gel: experimental and theoretical study

Zhang, Zhendong; Liu, Xingrong; Wang, Ke; Niu, Yuzhong; Chen, Hou; Bai, Liangjiu; Zhang, Xue

doi:10.5004/dwt.2019.23916

Cited by 9 publications

(2 citation statements)

References 47 publications

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“…The presence and concentration of other ions that may compete with silver ions for capture sites can also be affected by the pH of the solution. For example, at low pH, hydrogen ions (H + ) are abundant and may compete with silver ions for binding sites on the adsorbent [35]. The highest loading percentage on the surface of SG-Cys − Na + was 86% at pH 6.…”

Section: Effect Of Phmentioning

confidence: 99%

Loading of Silver (I) Ion in L-Cysteine-Functionalized Silica Gel Material for Aquatic Purification

Al-Anber,

Al Ja’afreh,

Al-Momani

et al. 2023

Gels

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The L-cysteine-functionalized silica (SG-Cys−Na+) matrix was effectively loaded with silver (I) ions using the batch sorption technique. Optimal Ag(I) loading into SG-Cys−Na+ reached 98% at pHi = 6, 80 rpm, 1 mg L−1, and a temperature of 55 °C. The Langmuir isotherm was found to be suitable for Ag(I) binding onto SG-Cys−Na+ active sites, forming a homogeneous monolayer (R2 = 0.999), as confirmed by FTIR spectroscopy. XRD analysis indicated matrix stability and the absence of Ag2O and Ag(0) phases, observed from diffraction peaks. The pseudo-second-order model (R2 > 0.999) suggested chemisorption-controlled adsorption, involving chemical bonding between silver ions and SG-Cys−Na+ surface. Thermodynamic parameters were calculated, indicating higher initial concentrations leading to increased equilibrium constants, negative ΔG values, positive ΔS values, and negative ΔH. This study aimed to explore silver ion saturation on silica surfaces and the underlying association mechanisms. The capability to capture and load silver (I) ions onto functionalized silica gel materials holds promise for environmental and water purification applications.

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Section: Effect Of Phmentioning

confidence: 99%

Loading of Silver (I) Ion in L-Cysteine-Functionalized Silica Gel Material for Aquatic Purification

Al-Anber,

Al Ja’afreh,

Al-Momani

et al. 2023

Gels

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show abstract

“…For this reason, it is necessary to evaluate the affinity of absorbents to specific materials in order to increase the probability of success in the experiment. To achieve this goal, several authors in the last decade have used in silico calculations as a fundamental tool for the prediction and selection of suitable materials for the absorption of specific new pollutants [41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Adsorption of Amoxicillin and Ibuprofen on Chitosan and Graphene Oxide Materials: A Density Functional Theory Study

et al. 2021

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The occurrence, persistence, and accumulation of antibiotics and non-steroidal anti-inflammatory drugs (NSAIDs) represent a new environmental problem due to their harmful effects on human and aquatic life. A suitable absorbent for a particular type of pollutant does not necessarily absorb other types of compounds, so knowing the compatibility between a particular pollutant and a potential absorbent before experimentation seems to be fundamental. In this work, the molecular interactions between some pharmaceuticals (amoxicillin, ibuprofen, and tetracycline derivatives) with two potential absorbers, chitosan and graphene oxide models (pyrene, GO-1, and coronene, GO-2), were studied using the ωB97X-D/6-311G(2d,p) level of theory. The energetic interaction order found was amoxicillin/chitosan > amoxicillin/GO-1 > amoxicillin/GO-2 > ibuprofen/chitosan > ibuprofen/GO-2 > ibuprofen/GO-1, the negative sign for the interaction energy in all complex formations confirms good compatibility, while the size of Eint between 24–34 kcal/mol indicates physisorption processes. moreover, the free energies of complex formation were negative, confirming the spontaneity of the processes. The larger interaction of amoxicillin GOs, compared to ibuprofen GOs, is consistent with previously reported experimental results, demonstrating the exceptional predictability of these methods. The second-order perturbation theory analysis shows that the amoxicillin complexes are mainly driven by hydrogen bonds, while van der Waals interactions with chitosan and hydrophobic interactions with graphene oxides are modelled for the ibuprofen complexes. Energy decomposition analysis (EDA) shows that electrostatic energy is a major contributor to the stabilization energy in all cases. The results obtained in this work promote the use of graphene oxides and chitosan as potential adsorbents for the removal of these emerging pollutants from water.

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Fabrication of CS/SA Double‐Network Hydrogel and Application in pH‐Controllable Drug Release

Wang

Niu

et al. 2019

ChemistrySelect

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In order to promote the application range, double‐network hydrogels are usually fabricated to improve the mechanical properties. In this work, chitosan (CS) single‐network hydrogels were prepared firstly and sodium alginate (SA) was introduced as the second network. According to scanning electron microscopy (SEM), the microstructures of the CS and SA single‐network were identified as three‐dimensional network of pore and fiber structure, respectively. The microstructure maintained the pore structure after the formation of CS/SA double‐network due to the small amount of SA. The size of the pores was reduced, indicating the cross‐linking of the double‐network. The rheological results indicated that CS/SA double‐network with small amount of SA could enhance the mechanical strength of the hydrogel effectively. Finally, the in vitro release was operated, verifying the sustained release ability of the double‐network hydrogel. In addition, only small amount of the drug could be release in physiological environment (pH 7.4), while a quickly release was obtained in pathological tissue (pH 5.5), decreasing the side effect of the drug.

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Removal of Ag(I) from aqueous solution by thiourea-functionalized silica gel: experimental and theoretical study

Cited by 9 publications

References 47 publications

Loading of Silver (I) Ion in L-Cysteine-Functionalized Silica Gel Material for Aquatic Purification

Loading of Silver (I) Ion in L-Cysteine-Functionalized Silica Gel Material for Aquatic Purification

Predicting the Adsorption of Amoxicillin and Ibuprofen on Chitosan and Graphene Oxide Materials: A Density Functional Theory Study

Fabrication of CS/SA Double‐Network Hydrogel and Application in pH‐Controllable Drug Release

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