Flocculation properties of biodegradable amphoteric chitosan-based flocculants

In this current work, a series of cellulosebased flocculants, carboxymethyl cellulose-graftpoly[(2-methacryloyloxyethyl) trimethyl ammonium chloride] (CMC-g-PDMC) with different grafting ratios were successfully synthesized. CMC-g-PDMC bears high flocculation performance in removal of an anionic dye, Acid Green 25 (AG25), at various pH conditions, which is due to improvement of both positive charge and molecular weight after modification. Moreover, the dye removal efficiency is mostly improved with the increase of grafting ratio. Among the four tested salt additives, CMC-g-PDMC exhibits good salt resistance except for sodium chloride in the measured salt concentration range. Furthermore, the image analysis in combination with fractal theory has been employed to investigate the flocs properties including floc size and fractal structure for studying the flocculation mechanism in detail. It is confirmed that charge neutralization and bridging flocculation effects both play important roles in removal of AG25 from water.

show abstract

“…where C 0 and C are the dye concentrations in solution before and after flocculation, respectively (Yang et al 2011). …”

Section: Jar Testsmentioning

confidence: 99%

Efficient flocculation of an anionic dye from aqueous solutions using a cellulose-based flocculant

Cai

Yang

et al. 2015

Cellulose

Self Cite

View full text Add to dashboard Cite

show abstract

“…It was soluble almost in the whole pH range and only showed partial insolubility near its IEP at around pH 9.2. The excellent solubility of QCMC is mainly due to the amphoteric feature of having both cationic and anionic groups, which can adapt itself to various external conditions and maintain its stretched conformation of polymer chains (Yang et al, 2011).…”

Section: Water Solubility Of Chitosan-based Flocculantsmentioning

confidence: 99%

“…In recent years, extensive attention has been given to research and application of amphoteric chitosan-based flocculants (Cai et al, 2007;Yang et al, 2011). The reason is that amphoteric chitosan is more effective due to its improved flocculation performance and wider range of solubility due to the dual characteristics of both cationic and anionic groups.…”

Section: Introductionmentioning

confidence: 99%

Flocculation of algal cells by amphoteric chitosan-based flocculant

Dong

Chen

Cheng

2014

Bioresource Technology

View full text Add to dashboard Cite

“…But, textile wastewater is so complicated (Verma et al 2012) in fact that it may contain both cationic and anionic dyes, which adds more difficulties to the subsequent treatment process. Hence novel amphoteric flocculants (Dong et al 2014;Yang et al 2011) containing both cations and anions come into research hotspot in eliminating anionic and cationic dyes from water.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of the flocculation processes for removal of cationic and anionic dyes from water by an amphoteric grafting chitosan-based flocculant using response surface methodology

Yang

et al. 2015

Environ Sci Pollut Res

Self Cite

View full text Add to dashboard Cite

In this study, an amphoteric grafting chitosan-based flocculant (carboxymethyl chitosan-graft-poly(2-methacryloyloxyethyl) trimethyl ammonium chloride, denoted as CMC-g-PDMC) was applied to removal of the anionic and cationic dyes, acid Green 25 (AG25) and Basic Bright Yellow (7GL), from water. Flocculation conditions have been optimized by response surface methodology (RSM) on the basis of central composite design (CCD) using flocculant dosage, initial solution pH and temperature as input variables. The second-order and cubic regression models, which have been both tested by the analysis of variance (ANOVA), were constructed to link the output response (the dye removal factor) with the aforementioned input variables, respectively. The second-order regression model well described the process of AG25 removal, whereas the cubic one is more suitable for that of 7GL. The effects of those variables on the flocculation performance of CMC-g-PDMC for removal of the two dyes containing opposite charges from aqueous solutions have been studied, and the flocculation mechanisms including the interactive effects between various influencing factors have been discussed in detail also.

show abstract

Flocculation properties of biodegradable amphoteric chitosan-based flocculants

Cited by 115 publications

References 36 publications

Efficient flocculation of an anionic dye from aqueous solutions using a cellulose-based flocculant

Efficient flocculation of an anionic dye from aqueous solutions using a cellulose-based flocculant

Flocculation of algal cells by amphoteric chitosan-based flocculant

Modeling and optimization of the flocculation processes for removal of cationic and anionic dyes from water by an amphoteric grafting chitosan-based flocculant using response surface methodology

Contact Info

Product

Resources

About