Flocculation of aqueous kaolin suspension using a biodegradable flocculant system of poly (vinyl alcohol)- Acacia nilotica gum blends

Nasim, Tanbir; Pal, Abhijit; Bandyopadhyay, Abhijit

doi:10.1016/j.clay.2017.10.035

Cited by 26 publications

(9 citation statements)

References 25 publications

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“…[1][2][3] In this context, the stability of kaolin suspension is stemmed from the colloidal size, anisotropic shape, and the negatively charged basal faces of kaolin particles. [4,5] As kaolin particles carry slightly negative charges, cationically charged polymers are generally used for the flocculation of kaolin particles in suspensions. [6,7] Recently, natural polymeric flocculants have received great attention to destabilize colloidal systems.…”

Section: Introductionmentioning

confidence: 99%

“…Clay, and in particular kaolin, has been recognized as one of the most problematic minerals in the wastewater treatment of different industries due to the formation of highly stable suspensions and challenging separations . In this context, the stability of kaolin suspension is stemmed from the colloidal size, anisotropic shape, and the negatively charged basal faces of kaolin particles . As kaolin particles carry slightly negative charges, cationically charged polymers are generally used for the flocculation of kaolin particles in suspensions .…”

Section: Introductionmentioning

confidence: 99%

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Polarity of Cationic Lignin Polymers: Physicochemical Behavior in Aqueous Solutions and Suspensions

Sabaghi

Fatehi

2020

ChemSusChem

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The structure of cationic monomers can significantly impact the polarity of lignin after polymerization. Cationic hydrolysis lignin (CHL) polymers were produced by polymerizing hydrolysis lignin (HL) with [3‐(methacryloylamino)propyl] trimethylammonium chloride (MAPTAC) or [2‐(methacryloyloxy)ethyl] trimethyl ammonium chloride (METAC). The METAC monomer has an oxygen atom, with larger electronegativity, in its molecular structure, whereas the MAPTAC monomer contains a nitrogen atom, as well as an extra nonpolar CH2 group, facilitating investigation into the effects of the polarity of CHLs on their physicochemical performance in an aqueous system. CHL polymers are analyzed and their interactions with clay particles are determined in colloidal systems. CHLs are designed to have similar charge densities (2.1–2.2 mmol g−1) and molecular weights (55000–60000 g mol−1 ). The hydrodynamic radius (Hy) and radius of gyration, (Rg) of HL‐METAC are larger than those of HL‐MAPTAC, implying a more 3‐dimensional structure of HL‐METAC in aqueous solution. The stability ratio of kaolin particles affirms the better performance of HL‐METAC in comparison to HL‐MAPTAC, which reflects the better flocculation efficiency of HL‐METAC. The results also reveal that salt and urea aqueous solutions affect the Hy, Rg, and configuration of CHL polymers, which alters the flocculation efficiency of HL‐METAC and HL‐MAPTAC polymers in kaolin suspensions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polarity of Cationic Lignin Polymers: Physicochemical Behavior in Aqueous Solutions and Suspensions

Sabaghi

Fatehi

2020

ChemSusChem

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“…Moreover, to reduce the toxicity, the idea of combining synthetic organic flocculants with biopolymer-based flocculants can be further studied. At present, such kind of report is rare (Nasim et al 2018). Among organic flocculants, polyacrylamide (PAM) is one of the most commonly used (Taylor et al 2002).…”

Section: Perspectivesmentioning

confidence: 99%

“…The turbidity removal rate of humic acid-kaolin sewage with the β-cyclodextrin-based flocculant could reach 97.5% (Liu et al 2019 ). The residual turbidity of 3 mass% kaolin suspension treated with the poly (vinyl alcohol)-Acacia nilotica gum flocculant was as low as 15.3 NTU under the optimal conditions (Nasim et al 2018 ). In addition, the xylan-based flocculant was used to treat pulp mill wastewater; the removal rates of turbidity and lignin were 94.5% and 45.0%, respectively (Chen et al 2018b ).…”

Section: Progress In the Commonly Used Base Materialsmentioning

confidence: 99%

Biopolymer-based flocculants: a review of recent technologies

Jiang

Li²,

Tang

et al. 2021

Environ Sci Pollut Res

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Biopolymer-based flocculants have become a potential substitute for inorganic coagulants and synthetic organic flocculants due to their wide natural reserves, environmental friendliness, easy natural degradation, and high material safety. In recent years, with more and more attention to clean technologies, a lot of researches on the modification and application of biopolymer-based flocculants have been carried out. The present paper reviews the latest important information about the base materials of biopolymer-based flocculants, including chitosan, starch, cellulose, and lignin etc. This review also highlights the various modification methods of these base materials according to reaction types in detail. Via the recent researches, the flocculation mechanisms of biopolymer-based flocculants, such as adsorption, bridging, charge neutralization, net trapping, and sweeping, as well as, some other special mechanisms are comprehensively summarized. This paper also focuses on the water treatment conditions, the removal efficiency, and advantages of biopolymer-based flocculants in applications. Further, this review sheds light on the future perspectives of biopolymer-based flocculants, which may make progress in the sources of base materials, modification processes, multi-function, and deepening application researches. We believe that this review can guide the further researches and developments of biopolymer-based flocculants in the future, to develop them with a higher efficiency, a lower cost, more safety, and multi-function for more diversified applications.

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“…The use of clay minerals is rising up in materials during recent decades due to their environmental-friendly nature, and availability in different shape and characteristic sizes [1][2][3][4]. The sedimentation of solid clay micro and nanoparticles in aqueous media has been attractive for scientists due to many practical applications such as stability of dispersions and separation or purification strategies [5][6][7][8][9][10][11]. Typically, clay nanoparticles possess a nanolayered morphology that, in mesoscopic scale, can evolve to anisotropic nanoparticles such hollow tubular shape [12].…”

Section: Introductionmentioning

confidence: 99%

Sedimentation of halloysite nanotubes from different deposits in aqueous media at variable ionic strengths

Cavallaro

Taormina

Cascio

2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Halloysite clay is a natural nanomaterial that is attracting a growing interest in colloidal science. The halloysite aqueous dispersion stability is a key aspect for the configuration of a purification protocol as well as to establish the durability of a formulation. A physicochemical study demonstrated the role of ionic strength and nanotube characteristic sizes on the sedimentation behavior. We highlighted the importance of the electrostatic repulsions exercised between the particles in the settling process. A protocol for image analysis has been proposed to provide robust information from time resolved optical images on the suspensions.In conclusion, we managed to correlate microscopic aspect to the peculiar sedimentation process of halloysite nanotubes.

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Flocculation of aqueous kaolin suspension using a biodegradable flocculant system of poly (vinyl alcohol)- Acacia nilotica gum blends

Cited by 26 publications

References 25 publications

Polarity of Cationic Lignin Polymers: Physicochemical Behavior in Aqueous Solutions and Suspensions

Polarity of Cationic Lignin Polymers: Physicochemical Behavior in Aqueous Solutions and Suspensions

Biopolymer-based flocculants: a review of recent technologies

Sedimentation of halloysite nanotubes from different deposits in aqueous media at variable ionic strengths

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