Flocculation of both anionic and cationic dyes in aqueous solutions by the amphoteric grafting flocculant carboxymethyl chitosan-graft-polyacrylamide

Yang, Zhen; Yang, Hu; Jiang, Ziwen; Cai, Tao; Li, Haijiang; Li, Haibo; Li, Aimin; Cheng, Rongshi

doi:10.1016/j.jhazmat.2013.03.053

Cited by 268 publications

(115 citation statements)

References 48 publications

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“…It was observed that the dye removal of AB 10 increased with increasing particle dosage up to 0.6 g and reached to over 90.7% for both CTB and CTD. However, the dye removal of AB 10 decreased when the particle dosage was increased from 0.6 to 1.0 g. This phenomenon indicates that charge neutralization is very important in the process (Yang et al 2013). The increase in dye removal with increasing the particle dosage can be attributed to the increase of surface charges and the sorption sites.…”

Section: Dye Removal Studies Effect Of Flocculants Dosagementioning

confidence: 95%

“…The results can be explained as follows: (i) Lots of insoluble flocculants/dye complexes can be formed more easily through charge neutralization at higher dye concentration, which will aggregate further and form larger flocs through the bridging effect. (ii) Larger flocs can further capture small flocs and residual dyes in water through the sweeping effects (Yang et al 2013;Mahmoodi et al 2011). From the view of adsorption, when the initial dye concentration was lower, the adsorption active site was more.…”

Section: Effect Of Contact Time and Initial Dye Concentrationsmentioning

confidence: 99%

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Performance of Amphoteric Larch Tannin Derivative Particles for Removal of Azo Acid Dyes

Huang¹,

Liu²,

Wu³

et al. 2013

BioResources

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a Two particulate amphoteric larch tannin (CLT) products (CTD and CTB) were prepared by cross-linking reactions, and their acid dyes removal abilities were investigated. The effects of several parameters such as pH, contact time, and particle doses were tested, and the acid dyes removal behaviors of both types of particles were compared. The removal of azo acid dyes on CTD and CTB was pH-dependent, and the maximum removal of ≥90.7% was reached for Acid Black 10 B and 52.6% for Acid Red 14 in aqueous solution at pH 5.0. The effect of particle dosages on the removal of Acid Black 10 B and Acid Red 14 was important for two modified CLT particles. An excessive amount of modified CLT particles increased the chromaticity of water samples and caused the decline of dyes removal. Zeta (ζ) potential data revealed that the main mechanism of removal of the acid dyes on the CTD and CTB particles was charge neutralization.

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Section: Dye Removal Studies Effect Of Flocculants Dosagementioning

confidence: 95%

Section: Effect Of Contact Time and Initial Dye Concentrationsmentioning

confidence: 99%

Performance of Amphoteric Larch Tannin Derivative Particles for Removal of Azo Acid Dyes

Huang¹,

Liu²,

Wu³

et al. 2013

BioResources

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“…The mixture was stirred vigorously to make it well dispersed. Then the suspension was cooled to -12 C for at least 1.5 h to obtain a transparent and viscous cellulose solution (Yang et al 2013a). Next, 4.3 g of sodium monochloroacetate was added to the cellulose solution and vigorously stirred by a magnetic stirrer in a water bath at 55 C (Qi et al 2010).…”

Section: Synthesis Of Tcc Carboxymethylation Of Cellulosementioning

confidence: 99%

“…Flocculation is an economical and effective technique for removal of particle contaminants, such as organic pollutants in chemical and papermaking wastewater (Faust et al 2014), as well as dyes from dyeing effluent (Yang et al 2013a). In recent years, synthetic organic polymer flocculants, especially polyacrylamide and poly diallyl dimethyl ammonium chloride, have seen extensive application because of their mature production technology and high flocculation efficiency.…”

Section: Introductionmentioning

confidence: 99%

2,3,6-Tricarboxylate Cellulose as a Fully Biodegradable Flocculant: Efficient Synthesis and Flocculation Performance

Chen

Lv²,

Chen

et al. 2016

BioResources

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a Cellulose-based flocculants have shown excellent performance for wastewater flocculation, being low-cost and eco-friendly. However, they are still disturbed by the problems of incomplete biodegradability and unstable chemical structure. In the present study, 2,3,6-tricarboxylate cellulose (TCC) was developed as a novel fully biodegradable flocculant to deal with the preceding problems. The key carboxymethylation of cellulose was first carried out to make the subsequent NaIO4 oxidation occur under homogeneous conditions, which greatly enhanced the carboxylate content of the final TCC products. The chemical structure and solution properties of the TCCs were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometer system (XRD), field emission scanning electron microscopy (FESEM), charge density, particle size, and zeta potential. The flocculation performance of the TCCs was evaluated preliminarily by the turbidity removal of kaolin suspension. The positive results showed that all the TCC products had high carboxylate contents (more than 10 mmol/g) and zeta potentials. They exhibited excellent flocculation performance for the kaolin suspensions, in which the residual turbidities decreased from 610 to 14.9 NTU. Considering the degradation of cellulose caused by excessive NaIO4 oxidation, the TCC IV, together with its synthesis technology, could be used for practical applications in wastewater flocculation.

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“…Then, with the help of enhanced approachability of polyacrylamide chains, the larger flocs with net-like structure can further seize residual particles from water through sweeping effect. 110 Finally, the compacted flocs are formed and settle down.…”

Section: Flocculation Mechanismmentioning

confidence: 99%

A Review on Development and Application of Plant-Based Bioflocculants and Grafted Bioflocculants

Lee

Chong

Robinson

et al. 2014

Ind. Eng. Chem. Res.

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Flocculation is extensively employed for clarification through sedimentation. Application of ecofriendly plant-based bio-flocculants in wastewater treatment has attracted significant attention lately with high removal capability in terms of solids, turbidity, colour and dye. However, moderate flocculating property and short shelf life restrict their development. In order to enhance the flocculating ability, natural polysaccharides derived from plants are chemically modified by inclusion of synthetic, non-biodegradable monomers (e.g. acrylamide) onto their backbone to produce grafted bio-flocculants. This review is aimed to provide an overview of the development and flocculating efficiencies of plant-based bio-flocculants and grafted bio-flocculants for the first time. Furthermore, the processing methods, flocculation mechanism and the current challenges are discussed. All the reported studies about plant-derived bio-flocculants are conducted under lab-scale conditions in wastewater treatment. Hence, the possibility to apply natural bio-flocculants in food and beverage, mineral, paper and pulp, oleo-chemical and biodiesel industries is discussed and evaluated.

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Flocculation of both anionic and cationic dyes in aqueous solutions by the amphoteric grafting flocculant carboxymethyl chitosan-graft-polyacrylamide

Cited by 268 publications

References 48 publications

Performance of Amphoteric Larch Tannin Derivative Particles for Removal of Azo Acid Dyes

Performance of Amphoteric Larch Tannin Derivative Particles for Removal of Azo Acid Dyes

2,3,6-Tricarboxylate Cellulose as a Fully Biodegradable Flocculant: Efficient Synthesis and Flocculation Performance

A Review on Development and Application of Plant-Based Bioflocculants and Grafted Bioflocculants

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