Effects of sulfate ions and slightly acidic pH conditions on Cr(VI) adsorption onto silica gelatin composite

Venditti, Francesco; Cuomo, Francesca; Ceglie, Andrea; Ambrosone, Luigi; Lopez, Francesco

doi:10.1016/j.jhazmat.2009.08.121

Cited by 40 publications

(16 citation statements)

References 24 publications

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“…25−27 There are reports in the literature on the use of silica-based composites for Cr(VI) adsorption, but none of these has gelatin as one of the components. 28,29 Gelatin is an easily available biopolymer that has good chemical, physical, and biological stability. It acts as an efficient adsorbent of ionic species as the functional groups present such as OH, NH 2 , NH 3 + , and COO − act as the binding sites through polar or ionic interactions.…”

Section: ■ Introductionmentioning

confidence: 99%

Gelatin–Silica-Based Hybrid Materials as Efficient Candidates for Removal of Chromium(Vi) from Aqueous Solutions

Thakur

Chauhan

2014

Ind. Eng. Chem. Res.

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Removal of Cr(VI) from water bodies is an environmental concern of utmost priority. It requires adsorbents that can efficiently operate under real conditions. In view of this, two new mesoporous hybrid materials were synthesized from gelatin and silica in the presence of tetraethylorthosilicate and sodium dodecyl sulfate via a sol−gel method. The as-synthesized hybrid material had a surface area of 394.86 m 2 g −1 . It was subjected to calcination at 550°C, and the resultant hybrid material had a surface area of 427.79 m 2 g −1 . These materials were used as adsorbents of Cr(VI) from its aqueous solutions, and the maximum adsorption capacities of 92.44 and 94.47 mg g −1 , for the as-synthesized and the calcined materials, were observed. The adsorption was spontaneous as signified by the negative values of Gibbs free energy. Application of the experimental data to different kinetic models and adsorption isotherms reveals that the adsorption process follows a second-order kinetic model and Freundlich isotherm.

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Section: ■ Introductionmentioning

confidence: 99%

Gelatin–Silica-Based Hybrid Materials as Efficient Candidates for Removal of Chromium(Vi) from Aqueous Solutions

Thakur

Chauhan

2014

Ind. Eng. Chem. Res.

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“…The absorption of the Cr(VI) on to the acidic sites of the biosorbent is also confirmed by measuring the pH during experiments. The chromium in the solution has the possibility of existing as the chromate ion (CrO 2− 4 ) or in the hydrogenated form (HCrO − 4 ) based on the acid dissociation kinetics given by Equations ( 1) and (2) [33,34].…”

Section: Resultsmentioning

confidence: 99%

“…The pH and temperature during the experiments were measured using the pH meter supplied by Extech Instruments Company. The characterization of different group vibrations was done by conducting FTIR analysis [32,33]. The docking of the metals to the amino acids was simulated and analyzed by using AutoDock Vina package and the visualization or post-processing was performed by using Visual Molecular Dynamics (VMD) package.…”

Section: Methodsmentioning

confidence: 99%

Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent

et al. 2021

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Biosorption of chromium (Cr(VI)) is studied by using raw (chemically not modified) Moringa (Moringa Oleifera) leaf powder without any pretreatment. Cr(VI) is one of the potentially harmful heavy metals found in industrial wastewater. In the Moringa leaf powder, the presence of a significant amount of organic acids form the source for the biosorption of Cr(VI). The concentration of Cr(VI) in the feed solution is varied and different dosages of the proposed biosorbent are used to study its efficiency in the removal of Cr(VI). The concentration of Cr(VI) is varied from 1 ppm to 20 ppm while the amount of biosorbent is varied from 0.5 g to 2.5 g. The equilibrium time for adsorption of Cr(VI) is observed to vary between half an hour and 90 min. The metal removal efficiency varied from 30% to 90% which is a significant achievement compared to other conventional methods which are either energy-intensive or not cost effective. The experimental results are modeled using Langmuir, Freundlich and Redlich–Peterson isotherms. The metal removal efficiency is attributed to the chelating effect of carboxylate and hydroxyl groups present in the moringa leaves and is confirmed from the FTIR analysis. Further molecular docking simulations are performed to confirm the binding of the metal to the speculated sites within the different acids present in the moringa leaves. Untreated green moringa leaf powder used as a biosorbent in this study leads to a sustainable and cheaper option for treating wastewater containing Cr(VI).

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“…Therefore, we can assume the gain to be a second-order process:

\begin{matrix} gain = k_{2} x^{2}, \end{matrix}

where k 2 is a kinetic constant. The loss, however, being proportional to verbascoside molecules reacting, is a process of first order:

\begin{matrix} loss = \frac{x}{τ}, \end{matrix}

where τ is the lifetime [35, 36] of the closure process.…”

Section: Discussionmentioning

confidence: 99%

Corneal Epithelial Wound Healing Promoted by Verbascoside-Based Liposomal Eyedrops

Ambrosone

Guerra

Cinelli

et al. 2014

BioMed Research International

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Different liposomal formulations were prepared to identify those capable of forming eyedrops for corneal diseases. Liposomes with neutral or slightly positive surface charge interact very well with the cornea. Then these formulations were loaded with verbascoside to heal a burn of corneal epithelium induced by alkali. The cornea surface affected involved in wound was monitored as a function of time. Experimental results were modeled by balance equation between the rate of healing, due to the flow of phenylpropanoid, and growth of the wound. The results indicate a latency time of only three hours and furthermore the corneal epithelium heals in 48 hours. Thus, the topical administration of verbascoside appears to reduce the action time of cells, as verified by histochemical and immunofluorescence assays.

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Effects of sulfate ions and slightly acidic pH conditions on Cr(VI) adsorption onto silica gelatin composite

Cited by 40 publications

References 24 publications

Gelatin–Silica-Based Hybrid Materials as Efficient Candidates for Removal of Chromium(Vi) from Aqueous Solutions

Gelatin–Silica-Based Hybrid Materials as Efficient Candidates for Removal of Chromium(Vi) from Aqueous Solutions

Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent

Corneal Epithelial Wound Healing Promoted by Verbascoside-Based Liposomal Eyedrops

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