The pH dependent surface charging and points of zero charge. VIII. Update

Kosmulski, Marek

doi:10.1016/j.cis.2019.102064

Cited by 121 publications

(61 citation statements)

References 207 publications

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“…[41] The pHzpc values obtained in the present study matches with the published results. [42] Figure 6. FTIR spectra of (a) Ul-ZnO NPs (b) Sm-ZnO NPs Figure 7.…”

Section: Point Of Zero Charge (Ph Zpc )mentioning

confidence: 99%

Seaweed Mediated Fabrication of Zinc Oxide Nanoparticles and their Antibacterial, Antifungal and Anticancer Applications

Anjali

Sangeetha²,

Raghunathan³

et al. 2021

ChemistrySelect

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Synthesis of zinc oxide nanoparticles (ZnO NPs) using aqueous extracts of seaweeds, Ulva lactuca, and Stoechospermum marginatum and their antibacterial, antifungal and anticancer activity have been reported. The UV absorption peaks at 310 nm and 345 nm confirmed the formation of ZnO NPs using U.lactuca (Ul-ZnO) and S.marginatum (Sm-ZnO), respectively. The XRD patterns indicated the crystalline nature of ZnO NPs with hexagonal wurtzite structure. The transmission electron microscopic analysis revealed that the ZnO NPs contain spherical and round-shaped particles with a size range of 12-17 nm for Ul-ZnO and 6-11 nm for Sm-ZnO NPs. The antibacterial activity and antifungal activity of both the NPs (Sm-ZnO and Ul-ZnO) were comparable. The results of the cytotoxicity assay of Ul-ZnO and Sm-ZnO NPs revealed that Ul-ZnO NPs recorded the maximum mortality rate of 97.34 % with an IC 50 value of 91.18 μg/ml.

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“…[41] The pHzpc values obtained in the present study matches with the published results. [42] Figure 6. FTIR spectra of (a) Ul-ZnO NPs (b) Sm-ZnO NPs Figure 7.…”

Section: Point Of Zero Charge (Ph Zpc )mentioning

confidence: 99%

Seaweed Mediated Fabrication of Zinc Oxide Nanoparticles and their Antibacterial, Antifungal and Anticancer Applications

Anjali

Sangeetha²,

Raghunathan³

et al. 2021

ChemistrySelect

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“…This phenomenon might be attributed to the introduction of a high zero charge point (FeCl 2 •4H 2 O and MgCl 2 •6H 2 O) which changed the acid base of WBC1x, or the fact that the type of surface charge on WBC1x altered in a solution with a different pH. The pH pzc of WBC1x increased with the increase in Mg addition in the synthesis process, which is because the pH pzc of MgO (approximately 12) [17] is greater than Fe 3 O 4 (around seven) [18], indicating that the pH pzc of WBC1x was positively related to the amount of MgCl 2 •6H 2 O addition.…”

Section: Physico-chemical Properties Of Wbc1xmentioning

confidence: 99%

“…When the pH was lower than the pH PZC , the adsorbent surface was positive, and vice versa. Since the pH pzc of MgO and Fe 3 O 4 is approximately 12 [17] and 7 [18], respectively, the surface charge capacity of biochar loaded with these two metal oxides is improved, which provides an opportunity for the electrostatic adsorption of negatively charged anions [5]. When the pH ranges between 3 and 10, phosphate is mainly in the form of H 2 PO 4 − , HPO 4 2− , and PO 4 3− , which is conducive to the adsorption of phosphate onto biochar.…”

Section: Effect Of Adsorbent Amount Fe 2+ /Mg 2+ Ratio Ph and Anionmentioning

confidence: 99%

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

Xue-feng

Huang

2020

Materials

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Magnetic biochar derived from agricultural biomass has been recognized as a cost-effective biochar sorbent for phosphate removal. This study evaluated the use of novel Fe/Mg-biochar nanocomposites (WBC1x), prepared by impregnating ground walnut shell in a solution with a different molar ratio of Fe2+ to Mg2+, then pyrolyzing slowly, at a temperature of 600 °C, to remove phosphate. The results showed that MgO and Fe3O4 were loaded onto the biochar successfully through the impregnation-pyrolysis method and the composites were able to be separated easily by magnetic field. Meanwhile, a higher surface area and point of zero charge on WBC1x were observed compared to the non-magnetic biochar (WBC). Moreover, the isothermal adsorption and kinetics data further suggested the that phosphate adsorption onto WBC1x resulted from chemisorption. Additionally, the maximum phosphate adsorption capacity of WBC1x was 6.9 mg.g−1, obtained though the Langmuir–Freundlich model, which was threefold higher than WBC, where MgO addition could enhance the adsorption capacity of WBC1x markedly by improving the surface charge.

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“…This is also supported by the fact that little separation was observed when the quartz powder was used for a column (notably, quartz exhibits a relatively weak ionic structure). The point of zero charge (PZC) of quartz surfaces is insignificant (<2, if any; Kosmulski 2020). In contrast, the olivine structure consists of independent SiO 4 tetrahedrons linked by divalent metal cations (i.e., Mg 2+ and Fe 2+ ) in sixfold coordination (Deer et al.…”

Section: Resultsmentioning

confidence: 99%

Interactions between organic compounds and olivine under aqueous conditions: A potential role for organic distribution in carbonaceous chondrites

Muneishi

Naraoka

2021

Meteorit & Planetary Scien

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Olivine is a principal anhydrous silicate mineral in chondritic meteorites. The structure of this mineral is composed of independent SiO4 tetrahedra linked by divalent cations (mainly Mg). Under hydrothermal conditions, olivine is transformed into serpentine, which is a major hydrated phyllosilicate in the matrix of carbonaceous chondrites. Although carbonaceous chondrites contain various types of organic matter, the interaction between organic compounds and olivine at low temperature has not been considered in the literature. We performed an experiment to test the adsorption of N‐containing organic compounds (i.e., alkylpyridines and alkylimidazoles) on olivine using liquid chromatography under aqueous conditions (pH = 2.5–10.5) at 20–40 °C. The N‐containing cyclic compounds were interacted with the SiO4 tetrahedra of olivine and their different adsorption abilities depended on the organic structures. Because alkylpyridines often occur at different locations than alkylimidazoles in carbonaceous chondrites, the results of this study suggest that olivine can separate the N‐containing compounds associated with aqueous fluid flows by asteroidal chromatography in the meteorite parent body. Liquid chromatography based on solid phase minerals may hence be a useful technique for simulating the behavior of organic compounds in carbonaceous asteroids under aqueous activity.

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The pH dependent surface charging and points of zero charge. VIII. Update

Cited by 121 publications

References 207 publications

Seaweed Mediated Fabrication of Zinc Oxide Nanoparticles and their Antibacterial, Antifungal and Anticancer Applications

Seaweed Mediated Fabrication of Zinc Oxide Nanoparticles and their Antibacterial, Antifungal and Anticancer Applications

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

Interactions between organic compounds and olivine under aqueous conditions: A potential role for organic distribution in carbonaceous chondrites

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