Partition of hematite in the Triton X-100/Dextran aqueous biphase system

Zeng, Xin; Quaye, J.; Osseo‐Asare, K.

doi:10.1016/j.colsurfa.2004.04.041

Cited by 7 publications

(4 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[10] More recently, other substances, such as proteins, surfactants, sugars, or amino acids, have been used as solutes for ABS formation in combination with either polymers or salts. [11][12][13][14][15] Interestingly, the codissolution of two salts in water can also generate an ABS. [16][17][18][19][20] In the latter case, one of the salts typically comprises one or both ions with a high-charge density (i.e., water/ion interactions are stronger than water/water interactions), and thus ions that are preferentially hydrated; whereas, the other salt comprises low-charge density ions (i.e., water/ion interactions are weaker than water/water interactions).…”

Section: Introductionmentioning

confidence: 99%

“…After knowing for years about a series of different ABS created by two polymers and water (especially polyethylene glycol (PEG) and dextran), Albertsson reported in 1986 the possibility of forming an ABS between a polymer and an inorganic salt 10. More recently, other substances, such as proteins, surfactants, sugars, or amino acids, have been used as solutes for ABS formation in combination with either polymers or salts 11–15. Interestingly, the co‐dissolution of two salts in water can also generate an ABS 16–20.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insight into the Interactions That Control the Phase Behaviour of New Aqueous Biphasic Systems Composed of Polyethylene Glycol Polymers and Ionic Liquids

Freire

Pereira

Francisco

et al. 2012

Chemistry A European J

160

View full text Add to dashboard Cite

New polyethylene glycol (PEG)/ionic liquid aqueous biphasic systems (ABS) are presented. Distinct pairs of PEG polymers and ionic liquids can induce phase separation in aqueous media when dissolved at appropriate concentrations. Phase diagrams have been determined for a large array of systems at 298, 308 and 323 K. A comparison of the binodal curves allowed the analysis of the tunable structural features of the ionic liquid (i.e., anionic nature, cationic core, cationic alkyl side chain length and functionalisation, and number of alkyl substituents in the cation) and the influence of the molecular weight of the PEG polymer on the ability of these solutes to induce an ABS. It was observed that contrary to typical ABS based on ionic liquids and inorganic salts, in which the phase behaviour is dominated by the formation of the hydration complexes of the ions, the interactions between the PEG polymers and ionic liquids control the phase demixing in the polymer-type ABS studied herein. It is shown that both the ionic liquids and PEG polymers can act as the salting-out species; that is, it is an occurrence that is dependent on the structural features of the ionic liquid. For the first time, PEG/ionic liquid ABS are reported and insight into the major interactions that govern the polymer/ionic liquid phase behaviour in aqueous media are provided. The use of two different nonvolatile and tunable species (i.e., ionic liquids and PEG polymers) to form ABS allows the polarities of the phases to be tailored. Hence, the development of environmentally friendly separation processes that make use of these novel systems is envisaged.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insight into the Interactions That Control the Phase Behaviour of New Aqueous Biphasic Systems Composed of Polyethylene Glycol Polymers and Ionic Liquids

Freire

Pereira

Francisco

et al. 2012

Chemistry A European J

160

View full text Add to dashboard Cite

show abstract

“…Several metallic ions such as aluminum, calcium, magnesium, zinc, cobalt, and mainly copper and iron are known to associate with dextrans and therefore might induce changes in the dextran precipitation rates. − Experiments with calcium, magnesium, copper, and iron were carried out on the basis of their more representative abundances when compared with the other metals found in Brazilian cachaças , and the recognized capacity of dextrans to form complexes with these metal ions. ,,, It is known in the literature that interactions occur already in slightly acidic or neutral conditions and strongly increase when the solutions are alkalinized. ,− The results of these experiments are summarized in Table II of the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Formation of Dextran Deposits in Brazilian Sugar Cane Spirits

Aquino

Franco

2011

J. Agric. Food Chem.

View full text Add to dashboard Cite

The formation of dextran deposits in sugared Brazilian cachaça was studied as a function of the time considering the effects of temperature, molecular weight (M(w)), visible light, pH, and the presence of Ca, Mg, Cu, and Fe ions in the concentrations at which they are usually present in this beverage. At 25 °C and pH 4.4, the experimental half-lives (t(1/2)) for precipitation are 73 and 124 days for dextrans with M(w) 5.9 × 10(6) and 2.1 × 10(6) Da, respectively. For dextrans with M(w) 5.0 × 10(5) and 4.0 × 10(4) Da, the experimental t(1/2) values are >180 days. For a dextran with M(w) 2.1 × 10(6) Da a change in pH from 4.4 to 5.5 at 25 °C resulted in a t(1/2) decrease from 124 to 25 days. At pH 4.4 the visible light and the presence of metal ions in average concentrations usually found in cachaças do not exhibit noticeable influence on the rate of dextran precipitation.

show abstract

“…The suspension samples were taken during the shaking process at every 30 to 60 minutes interval for centrifuging. The supernatant sample from the centrifuge was collected for UV-Vis spectrophotometer analysis by a variation method from Zerbe et al 2000 (Zeng, Quaye, & Osseo-Asare, 2004). For equilibrium adsorption analysis, instead of taking the sample at regular intervals, the suspension of surfactant formulation with local sand or kaolinite at fixed volume to mass ratio of 5:1 was kept shaking for approximately 24 hours, centrifuged and undergo UV-Vis spectrophotometer analysis.…”

Section: E T H O D O L O G Ymentioning

confidence: 99%

Influences of Alkaline and Salinity on Adsorption Capacity of Anionic Sodium Dodecyl Sulfate Surfactant

Mohd

Jaafar

2018

Asia Pr soc sci

View full text Add to dashboard Cite

Chemical losses in surfactant flooding could substantially degrade the efficiency of the process. This study aims to analyze the prospect of alkaline in minimizing surfactant adsorption. Static adsorption tests were conducted to investigate the adsorption of anionic sodium dodecyl sulfate (SDS) surfactant on local sand and kaolinite surfaces. Alkaline (sodium carbonate) ranging from 1wt% to 3wt% were added into the surfactant formulation with local sand or kaolinite at fixed volume to mass ratio of 5:1. Brine (sodium chloride) concentrations were varied from 1wt% to 3wt%. Equilibrium adsorption test was conducted by shaking the suspension for 24 hours, centrifuged and the supernatant sample was analyzed using UV-Vis spectrophotometer. The kinetics of surfactant adsorption was also analyzed by taking the suspension samples at every 30-60 minutes interval during the shaking process. Adsorption kinetics of SDS surfactant showed a nonlinear increase of the adsorption followed by a plateau. Adsorption on the kaolinite was found higher than the local sand. Increasing SDS concentration resulted in increase of adsorption on both local sand and kaolinite surfaces until reaching its micelle concentration. The increase in brine concentration also led to higher adsorption capacity, but alkaline addition has potentially reduced the adsorption due to higher repulsion force.

show abstract

Partition of hematite in the Triton X-100/Dextran aqueous biphase system

Cited by 7 publications

References 50 publications

Insight into the Interactions That Control the Phase Behaviour of New Aqueous Biphasic Systems Composed of Polyethylene Glycol Polymers and Ionic Liquids

Insight into the Interactions That Control the Phase Behaviour of New Aqueous Biphasic Systems Composed of Polyethylene Glycol Polymers and Ionic Liquids

Formation of Dextran Deposits in Brazilian Sugar Cane Spirits

Influences of Alkaline and Salinity on Adsorption Capacity of Anionic Sodium Dodecyl Sulfate Surfactant

Contact Info

Product

Resources

About