Recent Modifications of Chitosan for Adsorption Applications:  A Critical and Systematic Review

Kyzas, George Z.; Bikiaris, Dimitrios N.

doi:10.3390/md13010312

Cited by 392 publications

(191 citation statements)

References 84 publications

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“…Cs forms chelation between NH 2 -MO and molecules-NH 2 within its long chain structure. It was previously proven that these functional groups act as adsorption sites and consequently increase the adsorption capacity of photocatalyst system (Kyzas and Bikiaris 2015).…”

Section: Resultsmentioning

confidence: 99%

Incorporation of chitosan and glass substrate for improvement in adsorption, separation, and stability of TiO2 photodegradation

Amir

Julkapli

Hamid

2016

Int. J. Environ. Sci. Technol.

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It is demonstrated that single titanium dioxide (TiO 2 ) has high potential for photodegradation of pollutants. However, it is still far from becoming an effective photocatalyst system, due to issues of adsorption process, separation, as well as dissolution. Therefore, this study highlights the high adsorption capacity, simplified separation, and the promising stability of TiO 2(SY) (synthesized via sol-gel method) photocatalyst, fabricated using chitosan-TiO 2(SY) and supported by glass substrate (CsTiO 2(SY) /glass substrate) photocatalysts. Chitosan (Cs), with abundant -R-NH and NH 2 groups, promotes the adsorption sites of methyl orange (MO) and OH groups for major attachment to TiO 2(SY) . Meanwhile, the glass substrate increases stability and assists separation of the photocatalysts. Initially, nano-TiO 2(SY) has been characterized using high-resolution transmission electron microscope. Cs-TiO 2(SY) /glass substrate was fabricated via dip-coating. The distribution and interface between the photocatalytic components were characterized by Fourier transform infrared absorption spectroscopy, UV-Vis diffuse reflectance spectroscopy, field emission scanning electron microscopy, and energy-dispersive spectrometer. UV-Vis analysis of the multilayer photocatalyst (2, 4, 6, and 8 layers) was further carried out by the adsorption-photodegradation, with MO as model of pollutant. Seventy percent of the total removal of MO via optimized eight layers of photocatalyst was achieved within 1 h of UV irradiation. The adsorption photocatalyst achieved 50 % with no exposure to UV light for 15 min of irradiation. It is concluded that suitable photocatalytic conditions and sample parameters possessing the multilayer photocatalyst of Cs-TiO 2(SY) are beneficial toward the adsorption-photodegradation process in wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Incorporation of chitosan and glass substrate for improvement in adsorption, separation, and stability of TiO2 photodegradation

Amir

Julkapli

Hamid

2016

Int. J. Environ. Sci. Technol.

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“…It can be produced and found naturally in the cell walls of fungi, the shells of crustaceans and the shells of insects [35]. It is produced commercially in many different forms.…”

Section: Removing Epoxy From Carbon Fibermentioning

confidence: 99%

“…In biomedical applications, Chitosan can act as an interaction site in order to increase the adsorption capacity [31]. Therefore, in this work chitosan was used in the coating process in which both activated carbon fiber (ACF) and date pit activated carbon (DPAC) samples were coated with Chitosan [32]. The chitosan used in coating both materials contains amino (ÀNH2) and hydroxyl (ÀOH) groups on its chains [33].…”

Section: Removing Epoxy From Carbon Fibermentioning

confidence: 99%

Activating Carbon Fibers and Date Pits for Use in Liver Toxin Adsorption

Seyedzadeh¹,

Mwafy²,

Ahmed³

et al. 2017

Poisoning - From Specific Toxic Agents to Novel Rapid and Simplified Techniques for Analysis

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Acute liver failure (ALF) is a rare, potentially fatal complication of severe hepatic illness. It is a syndrome that triggers a cascade of events, leading to multiple organ failures and often death. The work aimed at demonstrating the usefulness of activated raw date pits and carbon fiber reinforced polymers (CFRP) in the management of ALF. The activated carbons produced are used for adsorption of albumin bound toxins from the liver of patients with ALF. The liver is not cured, however, patients are given the time they need to find a suitable donor. Initially, date pits are milled and epoxy is removed from the CFRP. Both materials then undergo pyrolysis and activation treatments. The activated carbon fiber (ACF) and powdered activated carbon (PAC) resulting are tested using FTIR and TGA analysis. FTIR spectrums provide information about functional groups present in the samples and TGA graphs illustrate weight loss as treatment temperature increases. From the data analysis carried out, it appears that the process of recycling both; date pits and CFRP was successful. This confirms the ability of PAC and ACFs to adsorb toxins and as potential candidates for consideration in the search for effective treatment options for liver failure.

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“…A modification of chitosan mainly involves the free-amine group on deacetylated units and hydroxyl groups on C 3 and C 6 carbons of monomers units (Kyzas and Bikiaris 2015). These groups of chitosan can be grafted or crosslinked with organic and inorganic moieties for removal of Cr(VI) (Debnath et al 2014;Tirgar et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Ionic solid-impregnated sulphate-crosslinked chitosan for effective adsorption of hexavalent chromium from effluents

Kahu

Shekhawat

Saravanan

et al. 2016

Int. J. Environ. Sci. Technol.

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Microwave-assisted tetrabutyl ammonium-impregnated sulphate-crosslinked chitosan was synthesized for enhanced adsorption of hexavalent chromium. The adsorbent obtained was extensively characterized using Fourier transform infrared, X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray studies.Various isotherm models such as Langmuir, Freundlich and Dubinin-Radushkevich were studied to comprehend the adsorption mechanism of hexavalent chromium by the adsorbent. Maximum adsorption capacity of 225.9 mg g -1 was observed at pH 3.0 in accordance with Langmuir isotherm model. The sorption kinetics and thermodynamic studies revealed that adsorption of hexavalent chromium followed pseudo-second-order kinetics with exothermic and spontaneous behaviour. A column packed with 1 g of adsorbent was found to give complete adsorption of Cr(VI) up to 900 mL of 200 mg L -1 solution which discerns the applicability of the adsorbent material for higher sample volumes in column studies. The effective adsorption results were obtained due to both ion exchange and ion pair interaction of adsorbent with hexavalent chromium. Greener aspect of overall adsorption was regeneration of the adsorbent which was carried out using sodium hydroxide solution. In the present study, the regenerated adsorbent was effectively reused up to ten adsorptiondesorption cycles with no loss in adsorption efficiency.

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Recent Modifications of Chitosan for Adsorption Applications: A Critical and Systematic Review

Cited by 392 publications

References 84 publications

Incorporation of chitosan and glass substrate for improvement in adsorption, separation, and stability of TiO2 photodegradation

Incorporation of chitosan and glass substrate for improvement in adsorption, separation, and stability of TiO2 photodegradation

Activating Carbon Fibers and Date Pits for Use in Liver Toxin Adsorption

Ionic solid-impregnated sulphate-crosslinked chitosan for effective adsorption of hexavalent chromium from effluents

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