Surface Charge of Alumina and Magnesia in Aqueous Media

Robinson, M.; Pask, Joseph A.; Fuerstenau, D.W.

doi:10.1111/j.1151-2916.1964.tb13801.x

Cited by 107 publications

(35 citation statements)

References 14 publications

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“…It should be noted that the pHint value determined in this study for the hydrated -Al2O3 is in good agreement with the PZC value found in (Robinson et al, 1964). From the data given in Table 3 we notice that in all the studied samples excepting -Al2O3 acidic centers predominate.…”

Section: Pure Oxidessupporting

confidence: 76%

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pH-Sensitive Nitroxide Radicals for Studying Inorganic and Organo-Inorganic Materials and Systems

Kovaleva¹,

Молочников²

2012

Nitroxides - Theory, Experiment and Applications

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Section: Pure Oxidessupporting

confidence: 76%

“…For example, as was shown previously, the PZC of an Al2O3 sample kept in water for a long time was equal to 9.2, and for Al2O3 treated at 1400°C, the PZC decreased to 6.7 (Robinson et al, 1964). The first value corresponds to -Al2O3, and the second one, to -Al2O3.…”

Section: Pure Oxidesmentioning

confidence: 64%

pH-Sensitive Nitroxide Radicals for Studying Inorganic and Organo-Inorganic Materials and Systems

Kovaleva¹,

Молочников²

2012

Nitroxides - Theory, Experiment and Applications

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“…The iso-electric point of alumina occurs at pH 9.0, whereas that of silica occurs somewhere around pH 2 to 3 [35,36]. Therefore, the Al-O sites tend to be basic, which tend to be proton acceptors, and Si-O sites tend to be acidic.…”

Section: Surface Species Of Kyanite and Sillimanitementioning

confidence: 99%

“…Based on the data in the literature, the binding energy of C1s, Al2p, Si2p and O1s is normally assigned at about 285, 74, 102 and 531 eV, respectively [37,38]. The iso-electric point of alumina occurs at pH 9.0, whereas that of silica occurs somewhere around pH 2 to 3 [35,36]. Therefore, the Al-O sites tend to be basic, which tend to be proton acceptors, and Si-O sites tend to be acidic.…”

Section: Sodium Oleate Adsorption On Mineral Surfacesmentioning

confidence: 99%

The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

et al. 2016

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Kyanite and sillimanite are two polymorphic minerals with the same formula of Al 2 SiO 5 , but different crystal structures. Despite their high economic values, selectively recovering them by flotation is a challenge. In this study, the flotation behaviors of the two minerals with sodium oleate as the collector were examined at different pH conditions. Zeta potential measurement, infrared spectroscopic measurement, chemical speciation and X-ray photoelectron spectroscopy measurement were conducted to identify the underpinning mechanisms. It is found that the flotation behavior of both minerals is different under the same flotation condition. The flotation recovery of sillimanite is much higher than that of kyanite in the presence of the collector sodium oleate. Sodium oleate adsorbs onto the surfaces of kyanite and sillimanite mainly through the chemical interaction of the ionic-molecular dimers with aluminum atoms at pH 8.0. The higher sillimanite flotation recovery between the two minerals is related to the higher electrostatic charge densities of the aluminum atoms in six-fold coordination, which leads to the higher collector adsorption.

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“…In different studies, the isoelectric point of aluminum oxide ranged from 2.3 to lO (Parks, 1965). It is considered that the difference in the isoelectric points is due to the calcination temperature since aluminum oxide becomes acidic after calcination (Robinson et al , 1964). A ceramic membrane made of sintered aluminum oxide particles is negatively charged with hydroxyl groups on its surface (Shimizu et al, 1989).…”

Section: Resultsmentioning

confidence: 99%

Properties of Protein Adsorption and Desorption of Alumina Ceramic Membrane.

Kawakatsu

Yonemoto

Nakajima

1998

FSTI

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The properties of protein adsorption and desorption of alumina ceramic membranes were investigated using several types of proteins. The effect of pH on the protein adsorption was studied by soaking the membrane in protein solution. For basic proteins, the amount of protein adsorbed increased at pHS Iower than the isoelectric point due to an electrostatic interaction between the protein and the membrane. A single protein solution was filtered and the protein was adsorbed on the membrane. Most of the adsorbed protein was desorbed and conceutrated by changing the ionic strength or pH of the filtered solvent, however, the protein remaining on the membrane was not washed out even by soaking in sodium lauryl sulfate (SDS) solution. The adsorption-desorption experiments were carried out using a binary protein solution of lysozyme and p-galactosidase of pH 3 for the adsorption step and phosphate buffer solution of pH 7 for the desorption step. During the adsorption step, P-galactosidase was adsorbed more than the lysozyme, however, the absolute adsorbed amount was smaller than that in the single protein solution of P-galactosidase since the adsorption site was partially occupied by lysozyme. P-Galactosidase was concentrated seven-fold in the permeate during the desorption step in the first 20 s, while the concentration of lysozyme was one-tenth of its original value.Keywords: protein adsorption, protein desorption, ceramrc membrane mrcrofiltratron Protein adsorption and desorption are important subjects during ultrafiltration and microfiltration processes. For ultrafiltration, the protein itself is usually a separation target and rejected protein is adsorbed on the membrane surface using lower-molecular-weight cut-off membranes (Matthiasson, 1983, Turker & Hubble, 1987 or partially permeable membranes (Fane et al, 1983). Most polymeric membranes are negatively charged in the range of pH 3 to 7, and the adsorbed amount of protein (BSA) increased as the pH decreased in the region below the isoelectric point because of an electrostatic interaction between the protein and membrane surface (Matthiasson, 1983, Turker & Hubble, 1987. In another paper, the maximum adsorption was observed at the isoelectric point due to a weakness of the repulsive interaction between BSA molecules (Fane et al, 1983). For the microfiltration membrane, Bowen and Gan (1990) studied the adsorption properties of BSA on a hydrophilic polyvinylldene fiuoride (PVDF) membrane. In this case, both of the protein-membrane and protein-protein interactions were observed. The maximum adsorbed amount of protein (0.2-0.4 mg'm~2) was obtained in the region of the isoelectric point, pH 4.9. The minimum point was observed at around pH 4, and at lower pHs, the adsorbed amount of protein increased again. Persson et al ( 1993) studied the adsorption properties of ~-lactoglobulin on four kinds of organic membranes made of nylon-66, cellulose acetate, and hydrophilic and hydrophobic types of PVDF. The adsorption amount using a hydrophilic PVDF membrane was the least, al...

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Surface Charge of Alumina and Magnesia in Aqueous Media

Cited by 107 publications

References 14 publications

pH-Sensitive Nitroxide Radicals for Studying Inorganic and Organo-Inorganic Materials and Systems

pH-Sensitive Nitroxide Radicals for Studying Inorganic and Organo-Inorganic Materials and Systems

The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

Properties of Protein Adsorption and Desorption of Alumina Ceramic Membrane.

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