Non‐Conventional Adsorbents for Dye Removal

Crini, Grégorio

doi:10.1002/9781118721001.ch10

Cited by 24 publications

(11 citation statements)

References 279 publications

(188 reference statements)

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“…), recreation, horticulture, leisure (fishing, sports), jewelry and fashion, industrial products (impregnation products for wood treatment, paints, solvents, inks, etc.) or energy and biofuel production [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Hemp cultivation has been revived by “new” uses such as in construction and home renovation (hemp concrete, insulation panels, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, hemp is an ecological, economical and eco-responsible plant since its cultivation represents a reservoir of biodiversity that absorbs CO 2 and does not require phytosanitary treatment. Hemp has also many agronomic advantages (e.g., rapid growth with high yields, a good rotational crop, irrigation is not necessary) and meets environmental and societal requirements (e.g., suitable for integration in an organic farming system, local jobs) [ 7 , 8 , 9 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Use of Chènevotte, a Valuable Co-Product of Industrial Hemp Fiber, as Adsorbent for Pollutant Removal. Part I: Chemical, Microscopic, Spectroscopic and Thermogravimetric Characterization of Raw and Modified Samples

et al. 2021

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FINEAU (2021–2024) is a trans-disciplinary research project involving French, Serbian, Italian, Portuguese and Romanian colleagues, a French agricultural cooperative and two surface-treatment industries, intending to propose chènevotte, a co-product of the hemp industry, as an adsorbent for the removal of pollutants from polycontaminated wastewater. The first objective of FINEAU was to prepare and characterize chènevotte-based materials. In this study, the impact of water washing and treatments (KOH, Na2CO3 and H3PO4) on the composition and structure of chènevotte (also called hemp shives) was evaluated using chemical analysis, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray computed nanotomography (nano-CT), attenuated total reflectance–Fourier transform infrared (ATR-FTIR) spectroscopy, solid state NMR spectroscopy and thermogravimetric analysis. The results showed that all these techniques are complementary and useful to characterize the structure and morphology of the samples. Before any chemical treatment, the presence of impurities with a compact unfibrillated structure on the surfaces of chènevotte samples was found. Data indicated an increase in the crystallinity index and significant changes in the chemical composition of each sample after treatment as well as in surface morphology and roughness. The most significant changes were observed in alkaline-treated samples, especially those treated with KOH.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of Chènevotte, a Valuable Co-Product of Industrial Hemp Fiber, as Adsorbent for Pollutant Removal. Part I: Chemical, Microscopic, Spectroscopic and Thermogravimetric Characterization of Raw and Modified Samples

et al. 2021

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“…Chitosan is a copolymer polysaccharide of β-(1-4)-ᴅ-glucosamine (deacetylated units) and N-acetyl-ᴅ-glucosamine (acetylated unit); its main difference with chitin is the presence of free amino groups (-NH 2 ), which confer a cationic nature to this polyelectrolyte in acid medium with numerous applications for wastewater treatment [9,19,30]. The use of chitosan in different forms (flakes, hydrogels, beads or fibers) has been reported in literature as effective adsorbent materials [31], establishing as an attractive non-conventional alternative due to its chemical stability and selectivity towards various types of dyes such as the azo dye Reactive Red 195 (RR-195).…”

Section: Introductionmentioning

confidence: 99%

Reactive RED 195 dye removal using chitosan coacervated particles as bio-sorbent: Analysis of kinetics, equilibrium and adsorption mechanisms

Pérez-Calderón

Santos

Zaritzky

2018

Journal of Environmental Chemical Engineering

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Chitosan particles (CP) prepared by coacervation technique were used as bio-sorbent material to remove the azo RR-195 dye; removal percentage (%RM) and adsorption capacity (Q) in batch adsorption experiments under different conditions of bio-sorbent doses, agitation speed and pH medium were determined; the maximum pH of dye removal was 4. Different adsorption equilibrium isotherms were tested and Redlich-Peterson was the model that best fitted experimental results. From the adsorption thermodynamic parameters, it was concluded that the adsorption process of RR-195 onto CP is spontaneous, favorable (ΔG < 0), endothermic (ΔH > 0) and the dye molecules show affinity for the bio-sorbent (ΔS > 0). The maximum monolayer adsorption capacity (Q m ) of CP was 82.1 mg.g −1 at pH = 4 and 318 K; therefore coacervated chitosan particles are among the top three adsorbent agents for this dye. The %RM was 84.2% in 10 h when the initial concentration of the dye was 300 mg.L −1 . The mixed surface reaction and diffusion-controlled kinetic model (MSR-DCK), fitted satisfactorily experimental results, by considering simultaneous mechanisms of diffusion and adsorption process in the active sites. Fourier transform infrared spectroscopy (FTIR) with attenuated total reflection (ATR), scanning electron microscope-energy dispersion spectrometry X-ray (SEM-EDS) and Zeta potential analysis revealed that the interaction between dye molecules and the bio-sorbent are of an electrostatic nature. Desorption/regeneration experiments indicated that CP can be used in adsorptions/desorption cycles for the removal of wastewater containing RR-195. The information presented in this work demonstrates that CP can be a potent eco-friendly bio-adsorbent for the remediation of industrial wastewater. which in turn deteriorates the aquatic biota [7]. Moreover, these toxic compounds affect the human health; several pathologies such as cancer, jaundice, tumors, skin irritation, allergies, heart effects and mutation arise due to exposure to contaminated wastewater [8,9]. The chemical structure of the dyes allows to classify them as anionic (direct, acid and reactive dyes); cationic (basic dyes); and non-ionic (disperse dyes) [4]. The azo dyes are one of the most important synthetic dyes and they are characterized by having an azo group (eN]Ne) as chromophore, in addition to sulfonate groups (-SO 3 − ), giving the molecule its anionic nature. In the present work the removal of the azo dye Reactive Red 195 (RR-195) was analyzed. It is a reactive mono azo dye (description of is chemical structure is provided as Supplementary material, S1). Reactive dyes represent approximately over 12% of the worldwide production [10] and are extensively used in textile and printing industries [11] for dyeing of cellulose, wool and cotton fiber [12]. Reactive dyes form covalent bonds with the fibers that are to be colored;

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“…In order to formulate biocomposite sorbents, two types of materials are necessary: an inorganic support and a biodegradable active component. A widely used biopolymer is chitosan (Ch) because it has proven to be an effective adsorbent (Crini 2015) .…”

Section: Introductionmentioning

confidence: 99%

Performance of oxalic acid-chitosan/alumina ceramic biocomposite for the adsorption of a reactive anionic azo dye

Pérez-Calderón

Scian

Ducos

et al. 2021

Environ Sci Pollut Res

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A biocomposite system was developed and tested for the removal of the azo dye Reative Red (RR195) from wastewater. The biocomposite was synthesized using ceramic particles containing 75% alumina which were coated using chitosan crosslinked with oxalic acid. The biocomposite showed high performance at low pH (maximum adsorption capacity= 345.3mg.g -1 at pH=2). The physico-chemical and structure characteristics of the matrix were evaluated by Z-potential, FTIR-ATR, SEM-EDS, DRX and porosity. Langmuir sorption isotherm and Pseudo Second order model gave the best fit. The electrostatic interaction between RR195 (due to the sulfonate groups) and the free amino groups of chitosan, enabled successive desorption/regeneration cycles. The maximum removal percentage (>80%) occurred at pH=2 due to the crosslinking effect. Experiments at different temperatures allowed the calculation of thermodynamic parameters (G, S, H); adsorption was spontaneous, exothermic and enthalpy controlled. The presence of inorganic ions (NO3 ->Cl -) was analyzed during the adsorption process. This novel biocomposite can be applied as a cost-effective and environmentally friendly adsorbent for anionic azo dye removal from wastewater. The application of chitosan crosslinked with oxalic acid as a coating of the ceramic support enhanced the adsorption capacity and enabled its use under acidic conditions without solubilization.

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Non‐Conventional Adsorbents for Dye Removal

Cited by 24 publications

References 279 publications

Use of Chènevotte, a Valuable Co-Product of Industrial Hemp Fiber, as Adsorbent for Pollutant Removal. Part I: Chemical, Microscopic, Spectroscopic and Thermogravimetric Characterization of Raw and Modified Samples

Use of Chènevotte, a Valuable Co-Product of Industrial Hemp Fiber, as Adsorbent for Pollutant Removal. Part I: Chemical, Microscopic, Spectroscopic and Thermogravimetric Characterization of Raw and Modified Samples

Reactive RED 195 dye removal using chitosan coacervated particles as bio-sorbent: Analysis of kinetics, equilibrium and adsorption mechanisms

Performance of oxalic acid-chitosan/alumina ceramic biocomposite for the adsorption of a reactive anionic azo dye

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