Electrosurface properties of Na-bentonite particles in electrolytes and surfactants solution

Mészáros, Renáta Zákányiné; Jobbik, A.; Varga, G; Bárány, Sándor

doi:10.1016/j.clay.2019.105127

Cited by 13 publications

(3 citation statements)

References 32 publications

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“…Mindezek és korábbi pűblikációnk [19] alapján a nanomagnetit-agyagásvány hibrid részecskék szintézise, stabilizációja, elektromos felületi tűlajdonságai ismertnek tekinthetők, azonban érdemes az eddigi tűdományos ismereteket kiegészíteni további kolloidkémiai kísérletekkel, hogy még szerteágazóbban megismerjük ezen kompozit részecskék kolloidkémiai, azaz elektromos felületi tűlajdonságait. A kűtatásűnk célja tehát az volt, hogy megvizsgáljűk, kolloidkémiailag hogyan viselkednek a nanomagnetit-bentonit hibrid részecskék különböző közegben (különböző ionerősség mellett, különböző nanomagnetit-bentonit arányt alkalmazva, különböző pH-nál).…”

Section: Bevezete S (Nanomagnetit-bentonit Elegyek Stabilita Sa)unclassified

Nanomagnetit-bentonit vizes közegű diszperz rendszereinek zeta-potenciáljának vizsgálata

Pintér-Móricz

Mészáros

2021

IJEMS

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The stability of different type nanomaterials play an important role among recent scientific and industrial challenges, including the examination of the effect of polymers, surfactants and their mixture on surface and electric surface properties and aggregation extent of dispersed particles, which are of utmost importance. Bentonite and its composite with different nanomaterials are frequently used for instance in environmental protection for wastewater treatment, since due to their great specific surface area they have excellent sorption properties. There are several publications in the literature for the application of bentonite in drilling muds. By using them the fluid loss can be decreased during the drilling process, the filtration of the fluid can be increased, it also improves the rheological properties and the formation damage can also be mitigated. During research the investigation and the analysis of the zeta-potential of nanoparticles and their composites at different pH and salt content can be an interesting topic. During our experiments the electric surface properties of nanomagnetite synthetized in laboratory (NM), cation exchanged bentonite from Mád (Be) and the composite particles of these particles were investigated. Hybrid particles of different compositions (9:1, 7:3, 1:1, 3:7, 1:9) were analyzed at different potassium chloride concentrations (0.1 – 0.0001 M). The surface adsorption on the surface, i.e. the change in the surface charge can be traced well by analyzing the obtained zeta-potential values. The behavior of such systems was observed in the full pH interval, thus, valuable data were obtained regarding the colloidal stability. As for the stability, different requirements may emerge in practice, there are application fields where the colloidally stable system is advantageous, on the other hand, in some cases, ceasing the stabile system is the goal. Our investigations are of high importance in terms of stability and its characterization [1].

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Section: Bevezete S (Nanomagnetit-bentonit Elegyek Stabilita Sa)unclassified

Nanomagnetit-bentonit vizes közegű diszperz rendszereinek zeta-potenciáljának vizsgálata

Pintér-Móricz

Mészáros

2021

IJEMS

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“…Figure 11a presented the micrograph of mineral mixtures without the effects of EDTA. Note that the wettability and swelling of clay (illite and montmorillonite) in the mineral mixture would occur when it interacted with water [22]. Besides a large particle, there were many microparticles in Fig.…”

Section: Morphology Of the Soil Mineralsmentioning

confidence: 99%

“…On the one hand, because of their low hydraulic conductivity, water flow and solute transport in lowpermeability layers are slow [18]. On the other hand, low-permeability layers mainly consist of lowpermeability soil minerals such as silt and clay [19]; note that these minerals have great affinity and selectivity to HMs, especially clay [20][21][22][23]. As a result, a large quantity of HMs from wastewater has accumulated in the soil and groundwater system since long time ago, which enhances the hazards of heavy metal pollution and is also quite difficult to restore.…”

Section: Introductionmentioning

confidence: 99%

Effects of EDTA on adsorption of Cd(II) and Pb(II) by low-permeability soil minerals and on their microscopic characteristics

You¹,

Dai²,

Zhong³

et al. 2020

Preprint

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Background Ethylenediaminetetraacetic acid (EDTA) can serve as a washing agent in the remediation of low-permeability layers contaminated by heavy metals (HMs). Therefore, batch adsorption experiments, where quartz sands (SM1) and mineral mixtures (SM2) were used as low-permeability soil minerals (SMs), were implemented to explore the effects of different EDTA concentrations, pH and exogenous chemicals on the HM-SM-EDTA adsorption system. Changes in microscopic characterizes of SMs were determined by instrument analysis to investigate the mechanisms.Results As the EDTA concentration increased gradually, it gradually cut down the maximum Cd adsorption capacities of SM1 and SM2 from approximately 135 to 55 mg/kg and 2,660 to 1,453 mg/kg; and the maximum Pb adsorption capacities of SM1 and SM2 were reduced from 660 to 306 mg/kg and 19,677 to 19,262 mg/kg, respectively. When the mole ratio (MR = moles of HM ions / sum of moles of HM ions and EDTA) was closer to 0.5, the effect of EDTA was more effective; and Freundlich isotherm model fitted better to the data. It took 5 to 10 min for EDTA to begin taking its effect. EDTA worked well at pH below 7.0 and 4.0 for Cd and Pb, respectively. Low-molecular-weight organic acids (LMWOAs) affected the system mainly by bridging, complexation, adsorption site competition and reductive dissolution. Cu 2+ , Fe 2+ ions could greatly increase the Cd and Pb adsorption on SM2. There were feature changes in mineral particles including attachment of EDTA and microparticles, agglomeration, connection and smoother surfaces, making the specific surface area decrease from 16.73 to 12.59 m 2 /g.Conclusion All findings indicated that EDTA could effectively and economically reduce the HM adsorption capacity of SMs at the reasonable MR value, contact time and pH. The extent of the effects of LMWOAs and exogenous metal ions on the HM-SM-EDTA system depended on the synthesis of diverse effects and the selectivity of EDTA, respectively. EDTA reduced the HM adsorption capacity of SMs not only by complexation with HM ions, but also decreasing SSA and blocking active sites. Hence, the acquired insight from the presented study can help to promote the remediation of contaminated soil and groundwater.

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Effect of Surfactants on the Performance of Water-Based Drilling Fluids

Abu-Jdayil

Ghannam

2021

Petroleum Engineering

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Electrosurface properties of Na-bentonite particles in electrolytes and surfactants solution

Cited by 13 publications

References 32 publications

Nanomagnetit-bentonit vizes közegű diszperz rendszereinek zeta-potenciáljának vizsgálata

Nanomagnetit-bentonit vizes közegű diszperz rendszereinek zeta-potenciáljának vizsgálata

Effects of EDTA on adsorption of Cd(II) and Pb(II) by low-permeability soil minerals and on their microscopic characteristics

Effect of Surfactants on the Performance of Water-Based Drilling Fluids

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