Application of the central composite design to study the flocculation of an anionic azo dye using quaternized cellulose nanofibrils

Quinlan, Patrick; Tanvir, Aafia; Tam, Kam Chiu

doi:10.1016/j.carbpol.2015.06.095

Cited by 68 publications

(30 citation statements)

References 42 publications

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“…This is because biopolymer absorbs moisture from its surroundings as reported by Oun and Rhim (2015). A similar observation has been reported by Quinlan et al (2015). The second weight loss is 14.79 % and started at temperature range of 250-323°C due to the loss of COO-from the polysaccharide, our assumption are in a good agrement with that found by Shen et al (2014).…”

Section: Thermal Analysissupporting

confidence: 79%

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

et al. 2016

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Sorption of calcium ion from the hard underground water using novel oxidized graphene (GO) sheets was studied in this paper. Physicochemical properties and microstructure of graphene sheets were investigated using Raman spectrometer, thermogravimetry analyzer, transmission electron microscope, scanning electron microscope. The kinetics adsorption of calcium on graphene oxide sheets was examined using Lagergren first and second orders. The results show that the Lagergren secondorder was the best-fit model that suggests the conception process of calcium ion adsorption on the Go sheets. For isothermal studies, the Langmuir and Freundlich isotherm models were used at temperatures ranging between 283 and 313 K. Thermodynamic parameters resolved at 283, 298 and 313 K indicating that the GO adsorption was exothermic spontaneous process. Finally, the graphene sheets show high partiality toward calcium particles and it will be useful in softening and treatment of hard water.

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Section: Thermal Analysissupporting

confidence: 79%

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

et al. 2016

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“…The Fenton reaction can destroy the benzene ring structure in the dye molecule and improve the biodegradability of dye wastewater. The dyes in the presence of particles or colloidal form were easily removed by the flocculation‐coagulation process . The Fenton‐flocculation method has the advantage of high efficiency and no secondary pollution …”

Section: Introductionmentioning

confidence: 99%

Advanced treatment of actual textile dye wastewater by Fenton‐flocculation process

Xiao

Sun

et al. 2016

Can J Chem Eng

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To improve the performance of actual textile dye wastewater treatment, an advanced treatment combining the Fenton and flocculation processes was developed. The parameters affecting decolorization in the Fenton-flocculation process, including initial pH, H 2 O 2 dosage, Fe 2þ dosage, reaction temperature, reaction time, and flocculant dosage, were examined. With the optimal Fenton-flocculation condition parameters, more than 95 % COD removal, 99 % colour removal, and 99 % turbidity removal were obtained. UV-visible spectra of raw water and supernatant were further obtained after the Fenton-flocculation process, and results demonstrated that the chromophoric groups and the conjugated system in the dye molecular structure were destroyed. All these results confirmed that the Fenton-flocculation process was a favourable and effective post-treatment method for actual textile dye wastewater.

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“…The flocculation efficiencies of various samples for MO solution with the initial concentration of 200 mg/L at pH = 4 were depicted in Figure . As precisely analyzed in advance, virgin collagen was incapable of working well in the flocculation of MO solution, and this phenomenon was very similar to that of cellulose, chitosan and starch, which also performed quite poorly in flocculation before modification. By contrast, modified products showed a similar inclination that removal efficiencies of all the samples investigated increased quickly at the beginning and then approached a relatively stable balance, and ultimately decreased slightly as the addition of these collagen‐based flocculants gradually increased with best dosage around 30∼50 mg/L approximately.…”

Section: Resultsmentioning

confidence: 93%

Preparation of cationic modified collagen extracted from leather wastes and their application in dye flocculation

Liao

Zhang

et al. 2017

J of Applied Polymer Sci

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A series of novel cationic flocculants are designed and synthesized successfully by grafting two monomers onto the collagen backbone, namely acrylamide (AM) and 2-methacryloyloxyethyltrimethyl ammonium chloride (DMC). Apparently, these effective grafting modifications are well demonstrated by adopting FTIR and H 1 NMR measurements, which could be used to estimate grafting ratios of corresponding monomers approximately. Additionally, significant improvements in positive charge densities and amorphous aggregation structures are also definitely confirmed by Zeta and XRD measurements, respectively. Moreover, thermogravimetric analysis clearly proves the formation of cationic branched chain architectures, whose maximum thermal degradation temperature would significantly decrease with the introduction of AM. In addition, much more porous and rougher surface structures could be visibly observed after successful grafting modifications. Furthermore, when the feeding weight ratio between collagen and DMC is controlled at 1:3, or the equal amounts of AM and DMC are introduced meanwhile the mass ratio between collagen and mixed monomers (DMC 1 AM) is fixed at 1:4, the samples acquired could both perform the best in decolorizing the model wastewater containing methyl orange (MO) dyes in their groups, and hereby, a corresponding flocculation mechanism is also proposed based on the structural analysis of the formed flocs.

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Application of the central composite design to study the flocculation of an anionic azo dye using quaternized cellulose nanofibrils

Cited by 68 publications

References 42 publications

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

Advanced treatment of actual textile dye wastewater by Fenton‐flocculation process

Preparation of cationic modified collagen extracted from leather wastes and their application in dye flocculation

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