Competition between kaolinite flocculation and stabilization in divalent cation solutions dosed with anionic polyacrylamides

Lee, Byung Joon; Schlautman, Mark A.; Toorman, Erik; Fettweis, M.

doi:10.1016/j.watres.2012.07.056

Cited by 63 publications

(35 citation statements)

References 31 publications

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“…For Cu(II) sorption by the bioflocculant MBFR10543, Ca 2+ could increase the sorption capacity by decreasing the negative charge on the polymer. It has also been reported to develop bridges between anionic polyelectrolytes and negatively charged colloidal particles, thereby enhancing particle flocculation (Lee et al 2012). These two mechanisms have been detected in our previous studies, flocculating activity of kaolin clay suspension was enhanced to 94.5 % by adding 20 mg of bioflocculant in presence of 0.5 g Ca 2+ , while a flocculating activity of 44.7 % was achieved when 20 mg of the bioflocculant was added into kaolin suspension (1.0 L) alone and only 17.2 % reached when 0.5 g Ca 2+ was added alone ).…”

Section: Discussionmentioning

confidence: 99%

Characteristics and mechanisms of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543

Guo

2014

Appl Microbiol Biotechnol

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This paper investigated the characteristics of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543 and discussed the mechanism during the sorption process. Results have demonstrated that the removal efficiency of Cu(II) reached 96.9% by adding MBFR10543 in two stages, separately, 1.5 × 10(-2) % (w/w) in the 1.0-min rapid mixing (180 rpm) and 2.0 × 10(-2) % (w/w) after 2.0-min slow mixing (80 rpm), with pH value fixed at 6.0. Cu(II) sorption process could be described by the pseudo-second-order kinetic model and the Langmuir isotherms model. The negative Gibbs free energy change indicated the spontaneous nature of the sorption. Fourier transform infrared spectra analysis indicated that functional groups, such as -OH, -COOH, C═O, and -NH2, were existed in MBFR10543 molecular chains, which had strong capacity for removing Cu(II). Furthermore, both charge neutralization and bridging being the main mechanisms involved in Cu(II) removal by MBFR10543.

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Section: Discussionmentioning

confidence: 99%

Characteristics and mechanisms of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543

Guo

2014

Appl Microbiol Biotechnol

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“…Schematic illustrating the conceptual model of anionic polyacrylamide adsorption on kaolinite and subsequent flocculation for two different types of divalent cationic bridges. Reproduced with permission . Copyright 2012, Elsevier.…”

Section: Performance Assessment Of Flocculantsmentioning

confidence: 99%

“…Lee et al showed that the adsorption of anionic polyacrylamide on negatively charged kaolinite surface was enhanced by the interaction of cations like Ca 2+ and Mg 2+ with kaolinite particles as well as polymeric flocculant chains. [230] Bridging of cations with kaolinite surface and polyacrylamide chains were investigated. CaCl 2 and MgCl 2 , having divalent cations, showed stronger adsorption affinity and lowered the negative zeta potential as compared to monovalent salts such as NaCl.…”

Section: Specific Resistance To Filtration (Srf)mentioning

confidence: 99%

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Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Vajihinejad

Gumfekar

Bazoubandi

et al. 2018

Macro Materials & Eng

142

108

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Water soluble polymer flocculants are important constituents of solid–liquid separation units for the treatment of a variety of process‐affected effluents. The systematic development of a flocculant relies on a good understanding of flocculation process, polymer synthesis, polymer characterization, and, not the least, flocculation performance assessment as desired for a particular treatment process, all of which are essential to establish meaningful relationships between flocculant microstructure and flocculation efficiency. The aim of this article is to communicate the bigger picture of this research area to the readers. The recent advances in the application of bio/natural, synthetic, and stimuli‐responsive flocculants are reviewed. Then, the basic polymer reaction engineering tools to control the microstructure of flocculants are provided and the techniques for the quantification of flocculant microstructure are concisely discussed. This is followed by a review of the methods used for the characterization of particle‐polymer force measurement, and flocculation/dewatering assessment with attention to the characterization of aggregate structures.

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“…The presence of Ca 2+ ions suppresses the dissociation of functional groups of anionic polyelectrolytes and pectin macromolecules. Since Ca 2+ ions have high efficiency in reducing electrostatic reflections between anionic polyelectrolytes and colloidal particles, they provide anchoring and bridging sites for anionic polymer molecules (Lee et al, 2012). In our case, Ca 2+ ions build divalent cationic bridges between anionic polymer molecules and pectin particles.…”

Section: Resultsmentioning

confidence: 77%

Effect of molecular mass and surface charge of anionic polyacrylamide on pectin precipitation

Kuljanin¹,

Filipović²,

Nićetin³

et al. 2018

Food & Feed Res

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In sugar industry, separation of undesirable compounds in sugar beet juice is done mostly by CaO and carbon dioxide. In order to reduce the amount of lime, a new method of pectin separation based on the application CaSO 4 with the addition of various types of anionic polyacrylamides (PAMs) is presented. The effects of molecular weight (MW) and the surface charge type of anionic polyacrylamides on the pectin precipitation were investigated. These compounds cause the process of charge neutralization of pectin macromolecules, followed by two mechanisms of polymeric bridging effect: Ca 2+ bridges between anionic polymer molecules and pectin particles that promote the coagulation of pectin and Ca 2+ bridges between anionic polymers that hinder coagulation of pectin. The aim of this paper was to examine the effect of CaSO 4 mixture and anionic PAMs of different molecular weights and degree of ionizaton to increase the efficiency of removal of pectin from sugar beet juice. Two pectin preparations were isolated from sugar beet pulp. CaSO 4 was added to 100 cm 3 (0.1 % wt) pectin solution. Studies were performed with 10 different concentrations of CaSO 4 solution (50-500 mg/dm 3) with the addition of anionic PAM with two ionization degree and three molecular weight, concentrations of 3 mg/dm 3. The efficiency of pectin precipitation was monitored by measuring the zeta potential. The bridging effect of Ca 2+ ions between anionic PAMs and pectin has increased with an increase in the MW of the anionic PAMs. Using anionic PAM of the largest MW (1500 • 10 6 g/mol) and a lower degree of ionization (30%), the optimal amounts of CaSO 4 were measured: 340-355 mg/dm 3. These optimal concentrations were achieved at the zero value of the potential zeta when the pectin particles were discharged.

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Competition between kaolinite flocculation and stabilization in divalent cation solutions dosed with anionic polyacrylamides

Cited by 63 publications

References 31 publications

Characteristics and mechanisms of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543

Characteristics and mechanisms of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Effect of molecular mass and surface charge of anionic polyacrylamide on pectin precipitation

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