Copper, mercury and chromium adsorption on natural and crosslinked chitosan films: An XPS investigation of mechanism

Vieira, Rodrigo Silveira; Oliveira, Mona Lisa Moura de; Guibal, Eric; Rodríguez‐Castellón, Enrique; Beppu, Marisa M.

doi:10.1016/j.colsurfa.2010.11.022

Cited by 290 publications

(134 citation statements)

References 39 publications

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“…Absence of titanium suggests a chitosan thickness superior to 10 nm (XPS detection limit). The deconvoluted peaks of C 1s and O 1s of CSAPiTi sample gave four and two peaks, respectively (see Table S1 in supplementary data): peaks at 284.6 eV (30.4 ± 4.0%), at 286.1 eV (51.5 ± 2.4%), at 287.8 eV (15.7 ± 1.5%), and at 289 eV (1.9 ± 0.1%) were assigned to C-C/C-H, C-N/C-O, O-C-O/C=O and N-C=O, respectively, for C 1s signal [29,51] and peaks at 531.5 eV (99.2 ± 0.1%) and at 532.5-533 eV (0.8 ± 0.1%) which were assigned to O=C-N and O-C, respectively [52,53]. The deconvoluted N 1s signal gave two peaks at 399.3 and at 401.5 eV corresponding to -NH 2 and -NH 3 + , respectively.…”

Section: Xps Analysismentioning

confidence: 99%

Relevant insight of surface characterization techniques to study covalent grafting of a biopolymer to titanium implant and its acidic resistance

D’Almeida

Amalric²,

Brunon³

et al. 2015

Applied Surface Science

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Section: Xps Analysismentioning

confidence: 99%

Relevant insight of surface characterization techniques to study covalent grafting of a biopolymer to titanium implant and its acidic resistance

D’Almeida

Amalric²,

Brunon³

et al. 2015

Applied Surface Science

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“…These observations have inspired numerous chitosan modifications, specifically designed to reduce chromate ions in wastewater, such as introduction of xanthate to chitosan (Sankararamakrishnan et al 2006), synthesis of chitosan nanoparticles with zero-valent iron (Geng et al 2009a, b) and entrapment of zero-valent iron nanoparticles in chitosan beads (Liu et al 2010). GA-crosslinked chitosan also enhanced reduction of chromate ions, possibly from the presence of free aldehyde groups of GA (Vieira et al 2011). The reduction process helps alleviate the pollution impact by converting toxic Cr(VI) ions to relatively less toxic Cr(III) ions.…”

Section: Remediation Of Inorganic Contaminants In Aqueous Systemsmentioning

confidence: 94%

Environmental Applications of Chitosan and Its Derivatives

Yong

Shrivastava

Srivastava

et al. 2014

Reviews of Environmental Contamination and Toxicology

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Chitosan originates from the seafood processing industry and is one of the most abundant of bio-waste materials. Chitosan is a by-product of the alkaline deacetylation process of chitin. Chemically, chitosan is a polysaccharide that is soluble in acidic solution and precipitates at higher pHs. It has great potential for certain environmental applications, such as remediation of organic and inorganic contaminants, including toxic metals and dyes in soil, sediment and water, and development of contaminant sensors. Traditionally, seafood waste has been the primary source of chitin. More recently, alternative sources have emerged such as fungal mycelium, mushroom and krill wastes, and these new sources of chitin and chitosan may overcome seasonal supply limitations that have existed. The production of chitosan from the above-mentioned waste streams not only reduces waste volume, but alleviates pressure on landfills to which the waste would otherwise go. Chitosan production involves four major steps, viz., deproteination, demineralization, bleaching and deacetylation. These four processes require excessive usage of strong alkali at different stages, and drives chitosan's production cost up, potentially making the application of high-grade chitosan for commercial remediation untenable. Alternate chitosan processing techniques, such as microbial or enzymatic processes, may become more cost-effective due to lower energy consumption and waste generation. Chitosan has proved to be versatile for so many environmental applications, because it possesses certain key functional groups, including - OH and -NH2 . However, the efficacy of chitosan is diminished at low pH because of its increased solubility and instability. These deficiencies can be overcome by modifying chitosan's structure via crosslinking. Such modification not only enhances the structural stability of chitosan under low pH conditions, but also improves its physicochemical characteristics, such as porosity, hydraulic conductivity, permeability, surface area and sorption capacity. Crosslinked chitosan is an excellent sorbent for trace metals especially because of the high flexibility of its structural stability. Sorption of trace metals by chitosan is selective and independent of the size and hardness of metal ions, or the physical form of chitosan (e.g., film, powder and solution). Both -OH and -NH2 groups in chitosan provide vital binding sites for complexing metal cations. At low pH, -NH3 + groups attract and coagulate negatively charged contaminants such as metal oxyanions, humic acids and dye molecules. Grafting certain functional molecules into the chitin structure improves sorption capacity and selectivity for remediating specific metal ions. For example, introducing sulfur and nitrogen donor ligands to chitosan alters the sorption preference for metals. Low molecular weight chitosan derivatives have been used to remediate metal contaminated soil and sediments. They have also been applied in permeable reactive barriers to remediate metals in soil and groun...

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“…According to Vieira et al (2011), concentration, pH and ionic strength of the solution, beyond the effect of competitors ions, widely influences the adsorption properties, besides contributing to the protonation of the amino groups from the biopolymers. Thus, the knowledge of the behavior of these metallic species in solution, may contribute to the understanding of the adsorption mechanism (ionic change, electrostatic action, chelation, etc).…”

Section: Adsorption Of Metals Onto the Biosurfactantmentioning

confidence: 99%

Adsorption of copper, zinc and lead on biosurfactant produced from cassava wastewater

Kummer¹,

Cosmann²,

Pastore³

et al. 2016

Afr. J. Biotechnol.

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The remediation of soils contaminated by hydrophobic compounds, especially petroleum derivatives, using surfactants has been fairly studied. The use of these compounds in heavy metal contaminated areas is incipient and their mechanism of action has not been totally elucidated yet. The biosurfactants are compounds with surfactant characteristics produced by living organisms and have several environmental advantages, like greater biodegradability and production from renewable sources. The aim of this study was to evaluate the adsorption potential of the metals copper, zinc and lead onto the biosurfactant structure and to relate it to the Langmuir and Freündlich physicochemical models of adsorption. The biosurfactant produced presented an emulsification index (EI) around 60%, which was stable even after 72 h of emulsion formation. The analysis of FTIR and HPLC confirmed that the biosurfactant produced is composed mainly of surfactin, found in concentration of 28%. The biosurfactant was capable of adsorbing the metals in its structure. In the adsorption process of Pb 2+ , the biosurfactant was considered as an interesting adsorbent, but this behavior did not adjust satisfactorily to Langmuir and Freündlich models. Thus, the biosurfactant has the potential to be utilized in remediation processes of soils and treatment of effluents contaminated by heavy metals.

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Copper, mercury and chromium adsorption on natural and crosslinked chitosan films: An XPS investigation of mechanism

Cited by 290 publications

References 39 publications

Relevant insight of surface characterization techniques to study covalent grafting of a biopolymer to titanium implant and its acidic resistance

Relevant insight of surface characterization techniques to study covalent grafting of a biopolymer to titanium implant and its acidic resistance

Environmental Applications of Chitosan and Its Derivatives

Adsorption of copper, zinc and lead on biosurfactant produced from cassava wastewater

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