Bioadsorbtion of Arsenic by Prepared and Commercial Crab Shell Chitosan

Rana, Md. Masud; Halim, Mohammad A.; Hoque, S. A. M. Waliul; Hasan, Kamrul; Hossain, Kamal

doi:10.3923/biotech.2009.160.165

Cited by 13 publications

(5 citation statements)

References 30 publications

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“…This model states that chemisorption may be the rate-limiting step of sorption system involving valence forces through sharing or exchange of electrons between the sorbent and sorbate (Shaobin and Huiting 2005). The values of linear correlation coefficient (R 2 ) were observed to be 0.878 for CHBs, 0.993 for CHMBs and 0.942 for CHI-MMT, respectively (Figure 11) during the contact time of 10-120 minutes.…”

Section: Kinetic Studies Of As 3+ + Sorptionmentioning

confidence: 96%

“…The chitosan-montmorillonite beads-arsenic shows almost 75% of As 3+ was desorbed after the first desorption cycle, and that the desorption amount decreased with increasing desorption cycles. Greater desorption from Al 3+ sites was probable with As 3+ and was attributable to the weak affinity and probable outer-sphere bonding of As 3+ by silicon and aluminium oxides (Wang and Huiting 2007;Rana et al 2009) In addition, increased As 3+ desorption at pH < 5 (pH = 4.0) could be partially attributed to stronger competition by phosphate due to strong phosphate adsorption at this pH (Wong et al 2004). The observations of the current study indicate the complexity and ambiguity of processes that contribute to arsenic extraction from biosorbents by potassium dihydrogen phosphate.…”

Section: Desorption and Reusability Studies Of Sorbentsmentioning

confidence: 99%

“…By contrast, montmorillonite (MMT)-modified CHBs and composites are acid resistant and also provide higher surface areas and stronger mechanical properties than the pure chitosan. Chitosan is known for its hydrophilicity, biocompatibility, biodegradability, and anti-bacterial property (Rana et al 2009). The adsorption capability of chitosan was improved by the incorporation of MMT.…”

Section: Introductionmentioning

confidence: 99%

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Removal of As³⁺ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

Anjum

Seth

Datta

2013

Adsorption Science & Technology

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In this study, the sorptive removal of As 3+ with promising sorption efficiency up to a very low concentration has been investigated using chitosan-montmorillonite (MMT) composites (in the form of powder and beads). In addition, the recovery of the composite from the sorbent is proposed as well. The sorbent has been observed to show a sorption efficiency of 42.0% from 0.006 µg ml -1 of metal ion. The batch adsorption model was developed to predict the equilibrium adsorption capacity with respect to the pH of As 3+ solution, contact time and initial concentration of metal ion. The maximum As 3+ sorption capacity of 48.7 mg g -1 (achieved within 10 minutes of contact time) was obtained using chitosan-MMT beads at the pH of drinking water (8.0) at 298 K. The equilibrium sorption data were fitted to the Langmuir and Freundlich adsorption models and the model parameters were evaluated, wherein the Freundlich model shows the most favourable representation of As 3+ adsorption behaviour. The biocomposites show comparable high sorption capacity with detection and estimation of As 3+ from 0.004 (4.0 ppb) to 100.00 µg ml -1 (100.0 ppm) of aqueous solution. The adsorption kinetics demonstrated intra-particle diffusion as the rate-determining step during the initial phase of adsorption (up to 10 minutes of contact time), which were supported by X-ray diffraction studies; by contrast, chemisorption was found to be the rate-determining step during the later part of adsorption (after 10 minutes of contact time), which were confirmed by Fourier transform infrared spectroscopy-attenuated total reflectance studies. Desorption of As 3+ from the sorbents was optimized using potassium dihydrogen phosphate, wherein 0.1 M of the desorbate was found to be an appreciable regenerating agent supporting the reusability of the sorbent up to three cycles, retaining 4402 µg g -1 of the metal ion.

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Section: Kinetic Studies Of As 3+ + Sorptionmentioning

confidence: 96%

Section: Desorption and Reusability Studies Of Sorbentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of As³⁺ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

Anjum

Seth

Datta

2013

Adsorption Science & Technology

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“…Designing new heterogeneous catalytic processes which are environmentally friendly is still an ultimate goal for many critical industrial processes and pharmaceutical applications. − One approach to achieve the green socio-economic benefits is to design new catalysts that are supported on bio-polymers, supramolecules, and other scaffolding materials. The excellent capabilities of these materials lie in improving the recyclability, the selectivity, and the activity of catalysts as well as the rate of the chemical reactions and high conversions and product selectivity. − In the past few years, cyclodextrins have been widely used as a support in catalytic synthesis of bi-aryl and aryl-olefinic compounds through Suzuki–Miyaura C–C which produces a wide range of natural and medicinal compounds. Palladium-based catalysts are of special interest to medicinal and pharmaceutical industries due to the possibility of producing a wide range of potential derivatives with biological activities. − …”

Section: Introductionmentioning

confidence: 99%

“…The excellent capabilities of these materials lie in improving the recyclability, the selectivity, and the activity of catalysts as well as the rate of the chemical reactions and high conversions and product selectivity. 5 − 7 In the past few years, cyclodextrins have been widely used as a support in catalytic synthesis of bi-aryl and aryl-olefinic compounds through Suzuki–Miyaura C–C which produces a wide range of natural and medicinal compounds. Palladium-based catalysts are of special interest to medicinal and pharmaceutical industries due to the possibility of producing a wide range of potential derivatives with biological activities.…”

Section: Introductionmentioning

confidence: 99%

β-Cyclodextrin-Functionalized Fe₃O₄-Supported Pd-Nanocatalyst for the Reduction of Nitroarenes in Water at Mild Conditions

et al. 2023

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In this study, a novel heterogeneous catalyst (Fe 3 O 4 @β-CD@Pd) has been developed by the deposition of palladium nanoparticles on the β-cyclodextrin-functionalized surface of magnetic Fe 3 O 4 . The catalyst was prepared by a simple chemical co-precipitation method and characterized extensively by using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Xray photoelectron spectroscopy (XPS), and inductively coupled plasma-optical emission spectrometry (ICP-OES) analyses. Herein, the applicability of the prepared material was evaluated for the catalytic reduction of environmentally toxic nitroarenes to the corresponding anilines. The catalyst Fe 3 O 4 @β-CD@Pd showed excellent efficiency for the reduction of nitroarenes in water under mild conditions. A low catalyst loading of 0.3 mol % Pd is found to be efficient for reducing nitroarenes in excellent to good (99− 95%) yields along with high TON values (up to 330). Nevertheless, the catalyst was recycled and reused up to the 5th cycle of reduction of nitroarene without any loss of significant catalytic activity.

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Antioxidant Polymers: Metal Chelating Agents

Zalloum

Mubarak

2012

Antioxidant Polymers

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Antioxidants are generally used to retard the reaction of organic materials, such as synthetic polymers, with atmospheric oxygen. Such a reaction can cause the degradation of the polymer and can alter many of its properties. This in turn could lead to loss of flavor and the development of rancidity in foods, to an increase in viscosity and acidity, and to the formation of insolubles in lubricants. Natural polysaccharides -chitosan, chitin, and alginates -are biopolymers that are biodegradable, biocompatible, environmentally friendly, and nontoxic. Additionally, these polymers and many of their derivatives act as antioxidant materials; this is mainly attributed to the active hydroxyl and amino groups present in these biopolymers. Since chitosan, chitin, and alginates act as metal-chelating agents, this review will cover the existing and most recent literature on the use of these materials and their derivatives for this purpose, in addition to the synthetic methods for their derivatives, and their use as metal-chelating agents.

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Bioadsorbtion of Arsenic by Prepared and Commercial Crab Shell Chitosan

Cited by 13 publications

References 30 publications

Removal of As³⁺ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

Removal of As³⁺ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

β-Cyclodextrin-Functionalized Fe₃O₄-Supported Pd-Nanocatalyst for the Reduction of Nitroarenes in Water at Mild Conditions

Antioxidant Polymers: Metal Chelating Agents

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Bioadsorbtion of Arsenic by Prepared and Commercial Crab Shell Chitosan

Cited by 13 publications

References 30 publications

Removal of As3+ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

Removal of As3+ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

β-Cyclodextrin-Functionalized Fe3O4-Supported Pd-Nanocatalyst for the Reduction of Nitroarenes in Water at Mild Conditions

Antioxidant Polymers: Metal Chelating Agents

Contact Info

Product

Resources

About

Removal of As³⁺ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

Removal of As³⁺ Using Chitosan–Montmorillonite Composite: Sorptive Equilibrium and Kinetics

β-Cyclodextrin-Functionalized Fe₃O₄-Supported Pd-Nanocatalyst for the Reduction of Nitroarenes in Water at Mild Conditions