Molecular mechanism of anionic dyes adsorption on cationized rice husk cellulose from agricultural wastes

Jiang, Zhihong; Hu, Daodao

doi:10.1016/j.molliq.2018.11.153

Cited by 114 publications

(59 citation statements)

References 36 publications

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“…The value of ΔH 0 lower that 40 (kJ mol −1 ) indicate the physisorption is involved in methylene blue removal process from water 54 , 59 . Besides when ΔH 0 < 20 (kJ mol −1 ) van der Waals interaction plays an important role in the physical adsorption process 60 .…”

Section: Resultsmentioning

confidence: 99%

Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

Moșoarcă

Vancea

Popa

et al. 2020

Sci Rep

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In this study, the potential of a new low-cost adsorbent, Syringa vulgaris leaves powder, for methylene blue adsorption from aqueous solution was investigated. The adsorbent surface was examined using SEM and FTIR techniques. The experiments were conducted, in batch system, to find out the effect of pH, contact time, adsorbent dose, initial dye concentration, temperature and ionic strength on dye adsorption. The process is best described by Langmuir isotherm and the pseudo second order kinetic model. Maximum adsorption capacity, 188.2 (mg g−1), is better than other similar adsorbent materials. Thermodynamic parameters revealed a spontaneous and endothermic process, suggesting a physisorption mechanism. A Taguchi orthogonal array (L27) experimental design was used to determine the optimum conditions for the removal of dye. Various desorbing agents were used to investigate the regeneration possibility of used adsorbent. Results suggest that the adsorbent material is very effective for removal of methylene blue from aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

Moșoarcă

Vancea

Popa

et al. 2020

Sci Rep

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“…The equation of Langmuir isotherm is written below:

where

(L·mg −1 ) is a constant related to the affinity of binding sites and q m represents the maximum adsorption capacity of the material (mg·g −1 ), assuming a monolayer of adsorbate on the adsorbent surface; C e (mg·L −1 ) is the adsorbate concentration at equilibrium condition of adsorption, and q e is the amount of dye per unit of mass of composite (mg·g −1 ). The main characteristic of Langmuir isotherm can be expressed in terms of both equilibrium and dimensionless constant, called separation factor R L , which can be rewritten by the following equation [ 3 , 36 ]:

where C 0 (mg·L −1 ) is the initial concentration of the dyes. According to the values of R L , the type of isotherm can be interpreted as unfavorable ( R L > 1), linear ( R L = 1), favorable (0 < R L < 1) and irreversible ( R L < 0).…”

Section: Methodsmentioning

confidence: 99%

“…New efforts must be made to overcome this environmental issue [ 1 ]. Dyes are widely used in textile, paper and plastic industries and present high water solubility, where around 10–20% of these chemical compounds still remaining in the wastewater [ 2 , 3 ]. Furthermore, since mostly dyes are classified as toxic and carcinogenic substances [ 4 ], the environmental impact also reaches the safe use category considering human health.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

et al. 2020

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In this work, chitosan/magnetite nanoparticles (ChM) were quickly synthesized according to our previous report based on co-precipitation reaction under ultrasound (US) irradiation. Besides ChM was in-depth structurally characterized, showing a crystalline phase corresponding to magnetite and presenting a spheric morphology, a “nanorod”-type morphology was also obtained after increasing reaction time for eight minutes. Successfully, both morphologies presented a nanoscale range with an average particle size of approximately 5–30 nm, providing a superparamagnetic behavior with saturation magnetization ranging from 44 to 57 emu·g−1. As ChM nanocomposites have shown great versatility considering their properties, we proposed a comparative study using three different amine-based nanoparticles, non-surface-modified and surface-modified, for removal of azo dyes from aqueous solutions. From nitrogen adsorption–desorption isotherm results, the surface-modified ChMs increased the specific surface area and pore size. Additionally, the adsorption of anionic azo dyes (reactive black 5 (RB5) and methyl orange (MO)) on nanocomposites surface was pH-dependent, where surface-modified samples presented a better response under pH 4 and non-modified one under pH 8. Indeed, adsorption capacity results also showed different adsorption mechanisms, molecular size effect and electrostatic attraction, for unmodified and modified ChMs, respectively. Herein, considering all results and nanocomposite-type structure, ChM nanoparticles seem to be a suitable potential alternative for conventional anionic dyes adsorbents, as well as both primary materials source, chitosan and magnetite, are costless and easily supplied.

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“…Dyes are classified among the top three pollutants globally, with over 700,000 tons of dyes consumed by the textile industry alone 3 . They are also known to be hazardous to all living things, negatively affecting photosynthesis in aquatic organisms, as well as being carcinogenic, mutagenic and allergenic 4 , 5 . Due to their complex chemical structures they are stable, and therefore exhibit resistance to biodegradation, which hinder their removal from water bodies 6 .…”

Section: Introductionmentioning

confidence: 99%

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Akpomie

Conradie

2020

Sci Rep

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This work was aimed at the synthesis of a hybrid (STpe-AgNP), obtained by impregnation of silver nanoparticles (AgNP) onto Solanum tuberosum peel (STpe), for the ultrasonic assisted adsorption of bromophenol blue (BB) dye. SEM, FTIR, XRD, EDX, TGA and BET techniques were used to characterize the adsorbents. The XRD, SEM and EDX confirmed successful impregnation of AgNPs onto STpe to form the hybrid. The AgNPs impregnated onto the hybrid were found to be water stable at various pH values of 2.0–9.0. Chi-square (χ2 < 0.024) and linear regression (R2 > 0.996) showed that the Freundlich model was best fitted among the isotherm models, corroborated by the oriented site model. Kinetic analysis conformed to the intraparticle diffusion and pseudo-first-order rate equations, while thermodynamics displayed a physical, spontaneous and endothermic adsorption process. The presence of competing Pb(II), Ni(II), Cd(II) and Zn(II) metal ions in solution interfered with the adsorption of BB onto the biosorbents. In terms of reusability, STpe and STpe-AgNP showed BB desorption of 91.3% and 88.5% respectively, using NaOH as eluent. Ultra-sonication significantly enhanced the adsorption of BB by both adsorbents, but the impregnation of AgNPs only slightly improved adsorption of the dye from the simulated wastewater. This study also illustrated that pristine STpe biomass waste is a cheap viable option for the decontamination of BB from water.

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Molecular mechanism of anionic dyes adsorption on cationized rice husk cellulose from agricultural wastes

Cited by 114 publications

References 36 publications

Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

Syringa vulgaris leaves powder a novel low-cost adsorbent for methylene blue removal: isotherms, kinetics, thermodynamic and optimization by Taguchi method

Magnetic Porous Controlled Fe3O4–Chitosan Nanostructure: An Ecofriendly Adsorbent for Efficient Removal of Azo Dyes

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

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