Point of Zero Charge, Isoelectric Point and Aggregation of Phyllosilicate Minerals

Álvarez-Silva, M.; Mirnezami, M.; Uribe‐Salas, A.; Finch, J.A.

doi:10.1179/000844310795937596

Cited by 6 publications

(12 citation statements)

References 12 publications

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“…The near‐neutral groundwater pH (6.6) at the Mosve aquifer provided a net negative surface charge of greenstone (IEP < 3), quartz (IEP = 2.0), and MS2 (IEP = 3.4), and a positive surface charge of the ferric oxide patches (IEP ∼ 8.5) [ Alvarez‐Silva et al ., ; Loveland et al ., ]. These factors indicated that adsorption by electrostatic attraction was the principal MS2 removal mechanism; hydrophobic interactions did not have much effect on removal because of the low pH and low organic content (Table ).…”

Section: Resultsmentioning

confidence: 97%

Rapid bacteriophage MS2 transport in an oxic sandy aquifer in cold climate: Field experiments and modeling

Kvitsand

Ilyas

Østerhus

2015

Water Resources Research

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Virus removal during rapid transport in an unconfined, low-temperature (68C) sand and gravel aquifer was investigated at a riverbank field site, 25 km south of Trondheim in central Norway. The data from bacteriophage MS2 inactivation and transport experiments were applied in a two-site kinetic transport model using HYDRUS-1D, to evaluate the mechanisms of virus removal and whether these mechanisms were sufficient to protect the groundwater supplies. The results demonstrated that inactivation was negligible to the overall removal and that irreversible MS2 attachment to aquifer grains, coated with iron precipitates, played a dominant role in the removal of MS2; 4.1 log units of MS2 were removed by attachment during 38 m travel distance and less than 2 days residence time. Although the total removal was high, pathways capable of allowing virus migration at rapid velocities were present in the aquifer. The risk of rapid transport of viable viruses should be recognized, particularly for water supplies without permanent disinfection.

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Section: Resultsmentioning

confidence: 97%

Rapid bacteriophage MS2 transport in an oxic sandy aquifer in cold climate: Field experiments and modeling

Kvitsand

Ilyas

Østerhus

2015

Water Resources Research

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“…Moreover, they are also surrounded by water molecules which define the hydration degree of the mineral as a function of the partial vapour pressure. While the edge surface of the mineral that suffered rupture of covalent or ionic bonds exhibits a strong pH dependence and H + and OH − are potential determining ions [13,17,36,51,52].…”

Section: Morphological Characterisationmentioning

confidence: 99%

“…This is well stated by the DLVO theory created by Derjaguin and Landau [53] and Verwey and Overbeek [54], where the van der Waals attraction forces and electrostatic interactions are the main mechanisms acting on the system. The quantitative degree and rate at which the near-surface chemistry of the particle is influenced by the release of ionic species on the aqueous phase needs to be understood [17,20,51,55].…”

Section: Electrostatic Surface Propertiesmentioning

confidence: 99%

“…Besides that, with cleavage, two reactive planes are formed: basal and edges, with different chemical specifications which need to be taken into account carefully, because it requires different characterisation methods. The pH is an intrinsic parameter related to the proton activity in the suspension system of charged colloidal particles [6,8,13,17,18]. Some approaches also investigate chemical modifications on the mineral surface, such as pre-treatment/activation or even its complete synthesis named layered double hydroxides (LDHs), which propose an improvement in the adsorption efficiency [8,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Physico-chemical and electrostatic surface characterisation of mica mineral and its applicability on the adsorption of Safranin Orange and Reactive Black 5 dyes

Ribeiro

Andrade

Quesada

et al. 2021

Environmental Technology

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The combined approach of specific surface area (SSA), porosity, microprobe analysis (EMPA), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with EDX and infrared spectroscopy (FTIR) provided the mica mineral physico-chemical and morphological characterisation. The electrostatic surface properties were assessed through the determination of the Point of Zero Charge (pH PZC ) by the drift method and the electrokinetic mica mineral features represented by the Isoelectric Point (pH IEP ) which was carried out through zeta potential measurements. Adsorption tests were performed to correlate the surface charge behaviour of the mica mineral and its influence on the adsorption efficiency of two different dyes, namely: Safranin Orange (SO), as a cationic dye and Reactive Black 5 (RB5), as an anionic dye. The higher adsorption capacity SO dye was observed at pH 9 and achieved almost 83% of removal, while RB5 dye adsorption on mica surface had the highest result, about 45% of removal efficiency, on pH of 3. In both cases, the main mechanism identified that drove this results is the electrostatic force of attraction between the adsorbent edge surface charge (pHdependent) and the ionic nature (anionic or cationic) of the pollutant dyes particles. The preliminary adsorption experiments demonstrated that the raw grounded mica mineral has a greater potential associated with its application on cationic dye removal in wastewater. The present study aimed to detail the main characteristics of the mica mineral in order to evaluate the potential use of such mineral residues in the removal efficiency of contaminated wastewater.

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“…Research has shown that chlorite at pH close to the IEP shows the highest level of aggregation [12], meaning that it is the most hydrophobic material at the IEP. Herein, we hypothesize that the magnitude of the pH can alter the adsorption amount and structure of the surfactant to be used, especially at the IEP.…”

mentioning

confidence: 99%

Adsorption mechanism of alkyl polyglucoside (APG) on calcite nanoparticles in aqueous medium at varying pH

Suh

Choi

Yang

et al. 2017

Journal of Solid State Chemistry

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Point of Zero Charge, Isoelectric Point and Aggregation of Phyllosilicate Minerals

Cited by 6 publications

References 12 publications

Rapid bacteriophage MS2 transport in an oxic sandy aquifer in cold climate: Field experiments and modeling

Rapid bacteriophage MS2 transport in an oxic sandy aquifer in cold climate: Field experiments and modeling

Physico-chemical and electrostatic surface characterisation of mica mineral and its applicability on the adsorption of Safranin Orange and Reactive Black 5 dyes

Adsorption mechanism of alkyl polyglucoside (APG) on calcite nanoparticles in aqueous medium at varying pH

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