Overview of wastewater treatment methods with special focus on biopolymer chitin-chitosan

Sarode, Shruti; Upadhyay, Punita; Khosa, Muhammad Arshad; Mak, Tony; Shakir, Abdus; Song, Sandra; Ullah, Aman

doi:10.1016/j.ijbiomac.2018.10.089

Cited by 207 publications

(74 citation statements)

References 151 publications

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“…Chitin and chitosan derivatives have different functional groups (-NH 2 , -OH) which interact with heavy metal ions, dissolved organic solids, colored dyes, and other contaminants. They particularly help remove targetted metal ions from aqueous solutions when the pH is close to neutral (Sarode et al, 2019). The flexibility of the polymer chain is also one of the reasons why chitin-/ chitosan-based biopolymer is an excellent biosorbent (Benavente et al, 2011).…”

Section: Application In Bioremediation Technologymentioning

confidence: 99%

“…Besides, the order of efficacy of chitosan for the removal of metal ions was Cu>Ni>Co>Mn (Ishii et al, 1995). The metal sorption, however, might have different mechanisms including ion exchange, ion-pairing, chelation, and electrostatic attraction depending on the pH and solution composition, since such parameters influence the protonation of biopolymers like chitosan and the speciation of metal ions (Sarode et al, 2019). Figure 13 shows the possible structures of chitosan-metal complexes.…”

Section: Application In Bioremediation Technologymentioning

confidence: 99%

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Utilization of marine by-products for the recovery of value-added products

Shahidi¹,

Varatharajan²,

Han³

et al. 2019

JFB

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The world fisheries resources have exceeded 160 million tons in recent years. However, every year a considerable amount of total catch is discarded as by-catch or as processing leftovers, and that includes trimmings, fins, frames, heads, skin, viscera and among others. In addition, a large quantity of processing by-products is accumulated as shells of crustaceans and shellfish from marine bioprocessing plants. Recognition of the limited marine resources and the increasing environmental pollution has emphasized the need for better utilization of the by-products. Marine by-products contain valuable protein and lipid fractions, minerals, enzymes as well as many other components. The major fraction of by-products are used for feed production-in making fish meal/oil, but this has low profitability. However, there are many ways in which the fish and shellfish waste could be better utilized, including the production of novel food ingredients, nutraceuticals, pharmaceuticals, biomedical materials, fine chemicals, and other value-added products. In recent times, much research is conducted in order to explore the possible uses of different by-products. This contribution primarily covers the characteristics and utilization of the main ingredients such as protein, lipid, chitin and its derivatives, enzymes, carotenoids, and minerals originating from marine by-products.

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Section: Application In Bioremediation Technologymentioning

confidence: 99%

Section: Application In Bioremediation Technologymentioning

confidence: 99%

Utilization of marine by-products for the recovery of value-added products

Shahidi¹,

Varatharajan²,

Han³

et al. 2019

JFB

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show abstract

“…The effluent dye industry has caused severe hazards to the environment and biology due to its complex structure and chromogenic functional groups [1][2][3]. Among many pollutants that the mill discharges millions of gallons into the water contain naphthol, vat dyes, sulfur, nitrates, acetic acid, chromium compounds and heavy metal ions like arsenic, lead, cadmium, copper, and many other pollutants [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan is used for the removal of dyes and metals [15,16] as it has active adsorption sites like amino (-NH 2 ) and hydroxyl (-OH) functional groups and metals. However, it has some disadvantages for industrial applications [3], wastewater technologies, such as the too soft structure, which creates problems [17][18][19], its high solubility in the organic solvent, high swelling percent in water, low mechanical strength, and low surface area [20]. Many studies have been applied to improve CS properties and efficiency [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Chitosan biopolymer based nanocomposite hydrogels for removal of methylene blue dye

et al. 2020

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Nanocomposite hydrogels were synthesized by γ-radiation-induced copolymerization and crosslinking of Chitosan biopolymer (CS), acrylic acid (AAc) and TiO 2 nanoparticles (CS-PAAc/TiO 2). The structure, morphology, and properties of the nanocomposites were investigated using Fourier-transform infrared spectroscopy, X-Ray Diffraction, Scanning electron microscopy, Transmission electron microscopy, and thermogravimetric analysis techniques. The nanocomposites hydrogel was used for the removal of methylene blue dye (MB) from wastewater. It was found that the presence of TiO 2 in the copolymeric matrix enhances the adsorption by increasing the physical interaction between the dye molecules and the adsorbent surface. The removal percentage increases with the increase in pH of the medium of all investigated samples and the maximum value is obtained at the solution pH is 10. The maximum adsorbent dosage for CS-PAAc/ TiO 2 nanocomposites is 0.20 g and for CS-PAAc hydrogel is 0.15 g per liter of the adsorbate. This study revealed that the loading of TiO 2 nanoparticles into the polymeric matrix of CS-PAAc does a remarkable increase in the removal parentage of MB dye from its aqueous solution.

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“…Biomaterials are an environmentally friendly and renewable natural resource that will not cause secondary pollution. Many biomaterials such as chitin and chitosan (CS) are being widely used due to their good adsorption performance on heavy metal ions …”

Section: Introductionmentioning

confidence: 99%

Electrospun Cellulose Acetate–Polycaprolactone/Chitosan Core–Shell Nanofibers for the Removal of Cr(VI)

Shi

Zhang

et al. 2019

Physica Status Solidi (a)

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Core-shell-structured cellulose acetate-polycaprolactone/chitosan (CA-PCL/CS) nanofibers with excellent removal performance of hexavalent chromium (Cr(VI)) are developed by coaxial electrospinning. The effect of core-to-shell ratio on adsorption capability is studied. The results show that all core-shell-structured fibers possess higher adsorption capability and good durability in acidic environment compared with the CS powder adsorbent. CA-PCL/CS fibers with coreto-shell ratio of 0.442 have a maximum adsorption capability of 126 mg g À1 at room temperature. The adsorption kinetics reveals that chemisorption serves as the rate-determining step by notable electron transfer, share, or exchange between adsorbents and adsorbates. The adsorption equilibrium data of the core-shell-structured CA-PCL/CS fiber adsorbents are all well described by the Freundlich isotherm model, indicating the multilayer adsorption process. Herein, it is highlighted that the core-shell-structured CA-PCL/CS nanofibers have a promising prospect in removing Cr(VI) ions from waste water.

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Overview of wastewater treatment methods with special focus on biopolymer chitin-chitosan

Cited by 207 publications

References 151 publications

Utilization of marine by-products for the recovery of value-added products

Utilization of marine by-products for the recovery of value-added products

Chitosan biopolymer based nanocomposite hydrogels for removal of methylene blue dye

Electrospun Cellulose Acetate–Polycaprolactone/Chitosan Core–Shell Nanofibers for the Removal of Cr(VI)

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