Preparation and properties of chitosan–metal complex: Some factors influencing the adsorption capacity for dyes in aqueous solution

Rashid, Sadia; Shen, Chensi; Yang, Jing; Liu, Jianshe; Li, Jing

doi:10.1016/j.jes.2017.04.033

Cited by 58 publications

(24 citation statements)

References 34 publications

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“…While variable removal efficiency of orthophosphate P i was achieved, it is noted that the sole use of metal species, e.g., Al 3+ or Fe 3+ , or biopolymer flocculants, such as alginate or chitosan, shows differences according to the relative dosage and pH conditions. The combined use of metal ion species and its resulting influence on the adsorption properties of chitosan has been described in a recent report by Rashid et al (2018) in a study of the adsorption properties of chitosan with Reactive Black 5 and other dyes. In the case (2018) of polydiallyldimethyl-ammonium chloride, a relatively low flocculant dosage of 0.5 mg/L was used, where relatively high orthophosphate P i is noted.…”

Section: Amphoteric Chitosan For Phosphate Removalmentioning

confidence: 99%

Chitosan for direct bioflocculation of wastewater

et al. 2019

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Coagulation/flocculation is a major phenomenon occurring during industrial and municipal water treatment to remove suspended particles. Common coagulants are metal salts, whereas flocculants are synthetic organic polymers. Those materials are appreciated for their high performance, low cost, ease of use, availability and efficiency. Nonetheless, their use has induced environmental health issues such as water pollution by metals and production of large amounts of sludges. As a consequence, alternative coagulants and flocculants, named biocoagulants and bioflocculants due to their biological origin and biodegradability, have been recently developed for water and wastewater treatment. In particular, chitosan and chitosan-based products have found applications as bioflocculants for the removal of particulate and dissolved pollutants by direct bioflocculation. Direct flocculation is done with water-soluble, ionic organic polymers without classical metalbased coagulants, thus limiting water pollution. Chitosan is a partially deacetylated polysaccharide obtained from chitin, a biopolymer extracted from shellfish sources. This polysaccharide exhibits a variety of physicochemical and functional properties resulting in numerous practical applications. Key findings show that chitosan removed more than 90% of solids and more than 95% of residual oil from palm oil mill effluents. Chitosan reduced efficiently the turbidity of agricultural wastewater and of seawater, below 0.4 NTU for the latter. 99% turbidity removal and 97% phosphate removal were observed over a wide pH range using 3-chloro-2-hydroxypropyl trimethylammonium chloride grafted onto carboxymethyl chitosan. Chitosan also removed 99% Microcystis aeruginosa cells and more than 50% of microcystins. Here, we review advantages and drawbacks of chitosan as bioflocculant. Then, we present examples in water and wastewater treatment, sludge dewatering and post-treatment of sanitary landfill leachate.

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Section: Amphoteric Chitosan For Phosphate Removalmentioning

confidence: 99%

Chitosan for direct bioflocculation of wastewater

et al. 2019

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“…According to our previous research (Rashid et al 2018), the metal salts used to prepare chitosan-metal complexes influence the formation of such complexes, which plays an important role in improving the adsorption capacity of chitosan. The amount of metal chelated with chitosan can be facilitated by the presence of SO 4 2À ions in the solution during the synthesis process.…”

Section: Preparation Of Chitosan-metal Complexesmentioning

confidence: 99%

“…A magnetic chitosan-Fe III hydrogel has been proposed for adsorbing dyes from strongly alkaline solutions (Rashid et al 2015;Shen et al 2011a). Meanwhile, various other kinds of metal ions, such as Zn II , Ni II , Ca II , Al III , La III , Mo VI and Zr IV , have also been used to prepare chitosan-metal complexes, and have been applied to pollutant removal (Chen et al 2017;Ma et al 2014;Rashid et al 2018, Shen et al 2016. Through these techniques, the adsorption ability of chitosan can be enhanced because of the chelation interaction between pollutants and chitosan-metal complexes.…”

Section: Introductionmentioning

confidence: 99%

“…Through these techniques, the adsorption ability of chitosan can be enhanced because of the chelation interaction between pollutants and chitosan-metal complexes. The adsorption ability of a chitosan-metal complex is closely related to the amount of metal chelated in the chitosan molecule (Rashid et al 2018). Since the linear chains of aand b-chitosan are aligned in different arrangements, their chelation interactions with metal ions are also expected to be different.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the adsorption behaviour of β-structure chitosan by metal binding

Wang

et al. 2018

Environ. Chem.

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Environmental contextChitosan is an abundant natural component of marine life with potential applications as an adsorbant material for pollutants. We investigate the binding behaviour of chitosan, and show that the β-type structure readily chelates metal ions leading to enhanced adsorption of anionic pollutants in the chitosan-metal complex. The results are highly relevant to the removal of anionic organic pollutants from water. AbstractChitosan, which is commonly extracted from squid pens of the Loligo genus, has a β-type structure. Chitosan has potential application to the adsorption of pollutants but has received little study. We investigate the adsorption ability of β-structure chitosan as well as FeIII and AlIII chitosan-metal complexes. Pristine β-chitosan shows lower adsorption abilities for dye, CrVI and fluoride ions compared with those for α-chitosan, mainly owing to having fewer –NH3+ groups on its surface. However, the anionic pollutant adsorption efficiency of β-chitosan is clearly enhanced when chelated with metal ions. A β-structure chitosan-Fe-Al complex displayed adsorption capacities of 621.45 mg g−1 and 144.53 mg g−1 for Acid Red 73 dye and fluoride ions, respectively, according to the fitted Langmuir–Freundlich model; and of more than 173.03 mg g−1 for CrVI, according to the Freundlich model. These values are much higher than those observed for α-structure chitosan-metal complexes. This enhancement effect on the sorptive behaviour of β-chitosan can be attributed to its loose structure. The polymer chains of β-chitosan are arranged in parallel with relatively weak intermolecular forces, which allows them to easily chelate metal ions. Anionic pollutants can then be efficiently adsorbed by the chelated metal ions in the chitosan-metal complex if the electrostatic attraction of the –NH3+ groups is weak. This investigation provides a better understanding of β-chitosan-based adsorbents for application to anionic pollutant adsorption and removal.

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“…Chitosan has received more attention for its wide range of applications in food science, biology, medicine, cosmetics, environmental protection, which contain potential application value. [4][5][6][7][8][9] Accordingly, new patterns are urgent to equip self-assembled structures of chitosan such as nanowires, hydrogels, membranes, and emulsions which could be applied to various fields. [10,11] As a hydrophilic biopolymer, chitosan is a compound with intramolecular hydrogen bond owing to the presence of plenty of free -NH 2 and -OH in each unit, which allows chitosan to have a strong chelating ability with metal ions.…”

Section: Introductionmentioning

confidence: 99%

Effects of metal ions on the self-assembly of chitosan molecules investigated with atomic force microscopy

Wang

Fei

Kong

et al. 2018

International Journal of Food Properties

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The effect of different metal ions including K + , Na + , Mg 2+ , and Ca 2+ at different concentrations on the self-assembly of chitosan molecules deposited on the new cleaved mica sheet was investigated using atomic force microscopy imaging techniques and other affiliated offline analysis methods. Chitosan molecules self-assembled porous film first when combined with K + , Na + , or Mg 2+ ions, and then gradually fractured a granular structure with increasing concentration of metal ions. Chitosan molecules would be self-assembled to fibrous structure after adding calcium ions, and grew much thicker and more flat when the concentration increased. The investigations on the effects of metal ions on the self-assembly of chitosan molecules would be useful for food preservation, environmental protection, and pharmaceutical developments and industries.

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Preparation and properties of chitosan–metal complex: Some factors influencing the adsorption capacity for dyes in aqueous solution

Cited by 58 publications

References 34 publications

Chitosan for direct bioflocculation of wastewater

Chitosan for direct bioflocculation of wastewater

Tuning the adsorption behaviour of β-structure chitosan by metal binding

Effects of metal ions on the self-assembly of chitosan molecules investigated with atomic force microscopy

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