Flocculation of algal cells by amphoteric chitosan-based flocculant

Dong, Changlong; Chen, Wei; Cheng, Liang

doi:10.1016/j.biortech.2014.07.108

Cited by 86 publications

(21 citation statements)

References 34 publications

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“…The abovementioned results were due to the great influence of the pH of the reaction solution on the graft copolymerization reaction. When the pH was lower than 4, CTA and DMDAAC molecules in the graft copolymerization reaction solution were easy to hydrolyze, thereby resulting in the formation of dendritic or cross-linked polymers and in the reduction of the intrinsic viscosity of CPCTS-g-P (CTA-DMDAAC) [37]. The hydroxymethylation reaction occurred easily under neutral or alkaline condition, thereby resulting in a decrease in the intrinsic viscosity and the grafting efficiency of the polymer [38].…”

Section: Effect Of Photo-initiator Concentration On Intrinsic Viscosimentioning

confidence: 99%

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

et al. 2018

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Abstract:The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. The microcystis aeruginosa that was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s −1 , respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).

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Section: Effect Of Photo-initiator Concentration On Intrinsic Viscosimentioning

confidence: 99%

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

et al. 2018

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“…In this study, the results showed that the presence of chitosan could obviously enhance the removal efficiency of algae. Chitosan has characteristics of both coagulants and flocculants, i.e., high cationic charge density, long polymer chains, bridging of aggregates and precipitation, and it does not leave residual metals that can cause second contamination problems (Dong et al, 2014). The main reason for the success of chitosan in water treatment as a flocculant is that chitosan has the advantage of being non-toxic, non-corrosive and safe to handle (Bolto and Gregory, 2007).…”

Section: Effect Of the Dosage Of Chitosan And Concentration Of Hydrocmentioning

confidence: 99%

“…Chitosan is a cationic polyelectrolyte obtained by deacetylation of chitin, which is the second most abundant biopolymer in the world (Renault et al, 2009) and has been proved highly effective in removing algae (Xu et al, 2013;Dong et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

KMnO4 pre-oxidation for Microcystis aeruginosa removal by a low dosage of flocculant

Wang

Mao

et al. 2015

Ecological Engineering

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“…109 A common trend was observed in subsequent amphoteric polysaccharide studies, where either etherification or graft copolymerization, or a combination of both were employed to introduce separate cationic and anionic groups onto the polysaccharide backbone. 106,107,[110][111][112] Apart from starch-based polymers 75-78, other studies have also synthesized amphoteric carboxymethyl cellulose (79), 107 chitosan (80), 110 and amylopectin (81,82). 82,111 This journal is © The Royal Society of Chemistry 2015…”

Section: Modified Polysaccharidesmentioning

confidence: 99%

Synthesis, properties and performance of organic polymers employed in flocculation applications

2016

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. Flocculation is a common technique that is widely used in many industrial applications to promote solid-liquid separation processes. The addition of a polymeric flocculant allows for destabilization of suspended colloidal particles, and thus significantly increases their sedimentation rate. Polymeric flocculants are generally divided into four categories, which include non-ionic, cationic, anionic, and amphoteric polymers. This minireview article summarises important information on the recent design and synthesis of polymeric materials from these four categories. In addition, their properties and flocculation efficiency are also presented and discussed.

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Flocculation of algal cells by amphoteric chitosan-based flocculant

Cited by 86 publications

References 34 publications

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

KMnO4 pre-oxidation for Microcystis aeruginosa removal by a low dosage of flocculant

Synthesis, properties and performance of organic polymers employed in flocculation applications

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