Kinetics, thermodynamics, isotherm and regeneration analysis of chitosan modified pandan adsorbent

Razmi, Fatin Amirah; Ngadi, Norzita; Inuwa, Ibrahim Mohammed; Lawal, A. O.

doi:10.1016/j.jclepro.2019.05.228

Cited by 101 publications

(29 citation statements)

References 36 publications

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“…Functional groups on the chitosan molecules include C 3 -OH, C 6 -OH, C 2 -NH 2 , and acetyl amino and glycoside bonds [6]. Among them, the acetyl amino bond is as stable as the glycosidic bond, which is not easy to fracture.…”

Section: Modification Of Chitosanmentioning

confidence: 99%

“…Studies have shown that when the DS is less than 50%, the DS is proportional to the solubility; the higher the DS is, the greater the solubility. The length of the side chain is proportional to the crystallinity, and a longer side chain results in a higher crystallinity and lower relative solubility [6,29]. N-acylated chitosan, with high solubility, can be used as a carrier for hydrophobic drugs [33], while N-acylated chitosan, with high crystallinity, can increase fiber toughness and thermal stability, making it suitable for applications such as use in polyvinyl chloride (PVC) fiber film materials [34,35].…”

Section: Acylated Modified Chitosanmentioning

confidence: 99%

“…Chitosan derivatives can be obtained by the chemical modification of chitosan-reactive functional groups. Here, the −OH and −NH 2 active groups on the chitosan molecule are prone to chemical reactions [6,7]. Chemical modification can not only improve the physical and chemical properties of chitosan, it can also retain the unique properties of chitosan and expand the application range of chitosan derivatives.…”

Section: Introductionmentioning

confidence: 99%

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Chitosan Derivatives and Their Application in Biomedicine

Wang

Meng

et al. 2020

IJMS

649

326

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Chitosan is a product of the deacetylation of chitin, which is widely found in nature. Chitosan is insoluble in water and most organic solvents, which seriously limits both its application scope and applicable fields. However, chitosan contains active functional groups that are liable to chemical reactions; thus, chitosan derivatives can be obtained through the chemical modification of chitosan. The modification of chitosan has been an important aspect of chitosan research, showing a better solubility, pH-sensitive targeting, an increased number of delivery systems, etc. This review summarizes the modification of chitosan by acylation, carboxylation, alkylation, and quaternization in order to improve the water solubility, pH sensitivity, and the targeting of chitosan derivatives. The applications of chitosan derivatives in the antibacterial, sustained slowly release, targeting, and delivery system fields are also described. Chitosan derivatives will have a large impact and show potential in biomedicine for the development of drugs in future.

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Section: Modification Of Chitosanmentioning

confidence: 99%

Section: Acylated Modified Chitosanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chitosan Derivatives and Their Application in Biomedicine

Wang

Meng

et al. 2020

IJMS

649

326

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“…This is possibly attributed due to the formation of a chemical bond or electrostatic attraction between adsorbate and adsorptive sites present on the SCH and NCH, and maybe chemisorption is the rate-controlling step. Also, the adsorption rate is proportional to the square of a number of unoccupied adsorption sites [67,68].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

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Coffee husk (CH) was physically and chemically treated with autoclaving (SCH) and NaOH (NCH) to develop low-cost adsorbent for the removal of methylene blue (MB) from synthetic wastewater, and their adsorption efficiencies were evaluated in batch mode. The prepared adsorbent was characterised by SEM, FTIR and point of zero charge. The central composite rotatable design (CCRD) was employed to optimise the adsorption process parameters such as pH, adsorbent dosage and initial MB concentration. The second-order quadratic model fitted best with the experimental adsorption data, and ANOVA results showed that the developed model was significant. The linear terms in the model significantly influence the adsorption capacity of SCH and NCH, but interaction terms were not significant. At optimised conditions, the developed adsorbents can remove > 90% of MB from the aqueous solution. Freundlich model showed a better fit with the adsorption isotherm data with R 2 greater than 0.95. Kinetics of MB adsorption onto SCH and NCH followed the pseudo-second-order model. The maximum monolayer adsorption capacity was found to be 129 and 200 mg/g for SCH and NCH, respectively. The present study showed that pretreated coffee husk waste can be used as an alternative for expensive adsorbents for the removal of dyes from wastewater.

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“…The adsorbent surface becomes more heterogeneous as 1/n value gets closer to 0. Freundlich isotherm is unable to describe the saturation behaviour of adsorbent because it can neither describe linear range at lower concentrations nor the saturation effect at high adsorbate concentrations [10,50,54,55]. The values of model and statistical parameters obtained through nonlinear regression of isotherm models at various temperatures for adsorption of CR and IC on CHCA is summarized in table 1.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Solution combustion synthesis of calcium aluminate nanocomposite using coffee husk extract as green fuel and its application in adsorptive amputation of anionic dyes

Murthy

Gowrishankar

Chandraprabha

et al. 2020

Mater. Res. Express

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Solution combustion synthesis of calcium aluminate (CaAl 2 O 4 ) nanocomposite using coffee husk extract and its adsorption capacity for removal of Congo red (CR) and Indigo carmine (IC) are reported. Physiochemical properties of adsorbent were studied by PXRD, SEM, TEM and point of zero charge. Batch adsorption studies were conducted to study the effect of adsorbent dosage, pH, contact time, initial dye concentration and temperature on adsorption efficiency of coffee husk derived calcium aluminate nanocomposite (CHCA). Among the isotherms used, Langmuir model explained best the equilibrium data and the maximum monolayer adsorption capacity was found to be 377 and 135 mg/g for CR and IC, respectively. Mass transfer analysis indicated adsorptive removal of dyes was controlled by both external and internal diffusion. Pseudo-first-order model fitted best with experimental kinetic data and adsorption efficiency increased with an increase in the initial bulk concentration of CR and IC. Thermodynamic analysis indicated that adsorption of CR and IC on CHCA is feasible, spontaneous and exothermic in nature. The magnitude of enthalpy and heat of adsorption suggested that the adsorption is physical in nature. The present study explores the potential of coffee husk extract, an agro-based bio-waste, as a novel and eco-friendly fuel in the synthesis of CHCA and the synthesised nanocomposite as a potential adsorbent for the removal of synthetic dyes.

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Kinetics, thermodynamics, isotherm and regeneration analysis of chitosan modified pandan adsorbent

Cited by 101 publications

References 36 publications

Chitosan Derivatives and Their Application in Biomedicine

Chitosan Derivatives and Their Application in Biomedicine

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Solution combustion synthesis of calcium aluminate nanocomposite using coffee husk extract as green fuel and its application in adsorptive amputation of anionic dyes

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