Applying zeta potential measurements to characterize the adsorption on montmorillonite of organic cations as monomers, micelles, or polymers

Zadaka, Dikla; Radian, Adi; Mishael, Yael G.

doi:10.1016/j.jcis.2010.08.010

Cited by 99 publications

(78 citation statements)

References 48 publications

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“…For example, the zeta potential of kaolin was -25.74 mV in naturally, which increases to -10.2 mV when 500 mg/L of FeCl 3 was added (Figure 6a). Previous studies have shown that di-and tri-valent cations bring the zeta potential value of clays closer to zero more than monovalent cations [30,31]. The results of the current study are similar to those obtained in previous studies, and the highest zeta potential values were usually obtained with Al 3+ and Fe 3+ salts in mineral suspensions.…”

Section: Effect Of Coagulants and Flocculants On Zeta Potential Of Kasupporting

confidence: 90%

Kaolen Süspansi̇yonlarinin Susuzlaştirilmasinda Koagülant Ve Flokülantlarin Etki̇si̇

Önen

Göçer²,

Taner³

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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Kaolin tailings are commonly generated in the mineral industry. They are invariably negatively charged and consequently tend to form stable dispersions with poor flocculation characteristics. Coagulation-flocculation treatments are suitable methods for removing colloidal particles from wastewater. In this study, the effects of mono/multivalent ions (coagulants) and polymers (flocculants) on the sedimentation and electrokinetic behaviours of kaolin have been investigated. In experimental studies, Al 2 (SO 4 ) 3 , FeCl 3 , MgCl 2 , CaCl 2 , NaCl were used as coagulant, while as flocculant anionic (A150), cationic (C521) and nonionic (N100) polymers were used. Isoelectric point of kaolin was determined as pH 4.2. The effectiveness of coagulants increased with the increase in the ionicity degree of the metal ions. Among the coagulants, FeCl 3 provided the highest efficiency (91%). Low sedimentation velocities (6.3-12.2 mm/min) were obtained with coagulants. The highest sedimentation efficiency (94%) was achieved with anionic flocculants and the same sedimentation velocity (58 mm/min) was reached with all flocculants.Keywords: Kaolin, dewatering, polymer, metal salts, zeta potential KAOLEN SÜSPANSİYONLARININ SUSUZLAŞTIRILMASINDA KOAGÜLANT VE FLOKÜLANTLARIN ETKİSİ ÖZKaolin atıkları mineral endüstrisinde yaygın olarak üretilir. Negatif yüklü olan bu atıklar zayıf flokülasyon özelliklerine sahip kararlı dağılımlar oluşturmaya eğilimlidirler. Koagülasyon-flokülasyon işlemleri, koloidal parçacıkları atık sulardan uzaklaştırmak için uygun yöntemlerdir. Bu çalışmada, mono/multivalent iyonların (koagülant) ve polimerlerin (flokülant) kaolenin çökelme ve elektrokinetik davranışlarına etkisi araştırılmıştır. Deneysel çalışmalarda, koagülant olarak Al 2 (SO 4 ) 3 , FeCl 3 , MgCl 2 , CaCl 2 , NaCl ve flokülant olarak, anyonik (A150), katyonik (C521) ve noniyonik (N100) polimerler kullanılmıştır. Kaolenin sıfır yük noktası pH 4.2 olarak belirlenmiştir. Koagülantların etkinliği, metal iyonlarının iyoniklik derecesinin artması ile artmıştır. Koagülantlar arasında FeCl 3 en yüksek verimi (%91) sağlamıştır. Koagülantlar ile düşük sedimantasyon hızları (6.3-12.2 mm/dk) elde edilmiştir. En yüksek sedimantasyon verimliliği (%94) anyonik flokülant ile sağlanmış ve tüm flokülantlar ile yaklaşık olarak aynı çökelme hızına (58 mm/dk) ulaşılmıştır.

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Section: Effect Of Coagulants and Flocculants On Zeta Potential Of Kasupporting

confidence: 90%

Kaolen Süspansi̇yonlarinin Susuzlaştirilmasinda Koagülant Ve Flokülantlarin Etki̇si̇

Önen

Göçer²,

Taner³

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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“…22,30 Charge neutralization was reached at a polymer loading of 0.3 mmol polymer/g clay, below the CEC, which was explained in terms of MMT surface screening by the highly charged polycation extending into the solution even at loadings lower than stochiometric neutralization. 22,30 The adsorption of HA to the negatively charged composite (prior to surface charge neutralization) was very low (<10%). At a polymer loading of 0.5 mmol/g PDADMAC, zeta potential was +27.5 mV and HA adsorption was complete.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Humic Acid on Pyrene Removal from Water by Polycation-Clay Mineral Composites and Activated Carbon

Radian

Mishael

2012

Environ. Sci. Technol.

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Pyrene removal by polycation-montmorillonite (MMT) composites and granulated activated carbon (GAC) in the presence of humic acid (HA) was examined. Pyrene, HA, and sorbent interactions were characterized by FTIR, fluorescence and zeta measurements, adsorption, and column filtration experiments. Pyrene binding coefficients to the macromolecules were in the order of PVPcoS (poly-4-vinylpiridine-co-styrene) > HA > PDADMAC (poly diallyl-dimethyl-ammonium-chloride), correlating to pyrene-macromolecules compatibility. Electrostatic interactions explained the high adsorption of HA to both composites (∼100%), whereas HA adsorption by GAC was low. Pyrene removal by the composites, unlike GAC, was enhanced in the presence of HA; removal by PDADMAC-MMT increased from ∼50 (k d = 2.2 × 10 3 kg/L) to ∼70% (k d = 2.4 × 10 3 kg/L) in the presence of HA. This improvement was attributed to the adsorption of pyrene-HA complexes. PVPcoS-MMT was most efficient in removing pyrene (k d = 1.1 × 10 4 kg/L, >95% removal) which was explained in terms of specific π donor−π acceptor interactions. Pyrene uptake by column filters of GAC reached ∼50% and decreased to ∼30% in the presence of HA. Pyrene removal by the PVPcoS-MMT filter was significantly higher (100−85% removal), exhibiting only a small decrease in the presence of HA. The utilization of HA as an enhancing agent in pollutant removal is novel and of major importance in water treatment. ■ INTRODUCTIONPolycyclic aromatic hydrocarbons (PAHs) are a group of persistent hydrophobic contaminants that have been detected in aquatic systems all over the world and are included in the US EPA and the EU priority list of pollutants (e.g., benzo(a)pyrene limit in water is 0.0002 mg/L). 1,2 Fate and transport of hydrophobic organic pollutants (including PAHs) in the environment is strongly affected by interactions with dissolved organic matter (DOM). 3−5 These interactions depend on both the chemical and structural characteristics of the pollutant and of the DOM and on the characteristics of the environmental system. 6 Studies have shown that in environmental systems the fate of organic contaminants can vary greatly in terms of adsorption or mobility. Several studies have demonstrated higher solubility and mobility of the pollutants in the presence of DOM. 7−9 For example, a study on enhanced organic pollutant solubility by DOM demonstrated increased partitioning coefficients into DOM with a decrease in pollutant water solubility and DOM polarity. 7 On the other hand, other studies have shown that the presence of DOM increased sorption and immobilization of organic pollutants to soil sediments and solid surfaces. 9−11 RavAcha and Rebhun 1992 suggested that DOM tended to solubilize organic pollutants when the adsorption coefficients (of the DOM) to the clay were relatively low, while adsorption of the pollutants to the clay increased as the DOM adsorption coefficients to the clay increased. 9 A later study also emphasized this complex behavior; the adsorption of an insecticide to soils d...

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“…Surfactants with longer alkyl chains can more easily anchor to Mt, as suggested by the gradual increase of the normalized surfactant loading (f ocm ) in Table 2 where the surfactant loadings of C18-BM and 2C18-DM were close to three times of CEC for Mt. Theoretically, Mt has a large specific surface area (700-800 m 2 /g) which depends on the amount of internal surface exposed by expansion in aqueous solution (Zadaka et al, 2010). The ideal surface area of the expanded Mt was assumed to be 750 m 2 /g (Okada et al, 2015).…”

Section: Characterization Of Organo-mtmentioning

confidence: 94%

Effect of surfactant molecular structure on perchlorate removal by various organo-montmorillonites

Luo

Sasaki

Hirajima

2015

Applied Clay Science

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Applying zeta potential measurements to characterize the adsorption on montmorillonite of organic cations as monomers, micelles, or polymers

Cited by 99 publications

References 48 publications

Kaolen Süspansi̇yonlarinin Susuzlaştirilmasinda Koagülant Ve Flokülantlarin Etki̇si̇

Kaolen Süspansi̇yonlarinin Susuzlaştirilmasinda Koagülant Ve Flokülantlarin Etki̇si̇

Effect of Humic Acid on Pyrene Removal from Water by Polycation-Clay Mineral Composites and Activated Carbon

Effect of surfactant molecular structure on perchlorate removal by various organo-montmorillonites

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