Effects of humic acid release from sepiolite on the interfacial and rheological properties of alkaline dispersions

Benli, B.

doi:10.1016/j.clay.2014.10.004

Cited by 10 publications

(9 citation statements)

References 25 publications

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“…Their formation and hydrodynamic sizes are strongly influenced by ionic size and metal ions (Von Wandruszka et al, 1997), especially Mg 2+ and Ca 2+ ions, pH and ionic strength. It is worth noting that although such structures of HAs could be responsible for the thermodynamically stable sepiolite suspensions (inhibited gel formation) in natural system as represented in Figure 12 and their sizes determined by Benli (2014), were also directly observed by high-resolution AFM images, were also changed in the range of 18-63  8 nm at pH 11.5. In an early review (Frenkel et al, 1992;Tarchitzky et al, 1993), it was shown that humic and fulvic acids were added to reference clay suspensions, which always increased colloidal stability.…”

Section: Discussionmentioning

confidence: 96%

“…This does not necessarily mean that HA molecules and their metal complexes are sorbed within the micropores. Because of the small size of micropores (<2 nm), penetration of HA molecules with a radius of gyration of 2.1 nm (Österberg et al, 1993) and their metal complexes which have the size range of 18-63  8 nm at pH 11.5 (Benli, 2014), seems unlikely. A more reasonable explanation is sorption at the mouths of such pores or their blocking of sepiolite's micro/meso pores for larger structured pseudomicellar domains by organic macromolecules or both.…”

Section: Discussionmentioning

confidence: 99%

“…However very little work has been published regarding their relevance to many aspects of surface and environmental chemistry. An attempt was made by Benli (2014) to present the effects of humic acid release from sepiolite on its interfacial and rheological properties of alkaline dispersions. The results observed that highly alkaline pH caused an increase in the total amounts of HA and free ions in relation to the formation/precipitation of both hydrophobic HA aggregate and HA-Mg 2+ complexes which have a spherical shape in the size range of 18-63 ± 8 nm at pH 11.5.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sepiolite and sepiolite-bound humic acid interactions in alkaline media and the mechanism of the formation of sepiolite-humic acid complexes

Sabah

Ouki

2017

International Journal of Mineral Processing

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sepiolite and sepiolite-bound humic acid interactions in alkaline media and the mechanism of the formation of sepiolite-humic acid complexes

Sabah

Ouki

2017

International Journal of Mineral Processing

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“…During contact mode measurements, NSC36/Cr-Au type of cantilevers was selected. Before measurements, all samples were specifically prepared similarly to our previous study (12). Briefly, one drop of 1% of sepiolite dispersion contains Ag-NPs (theoretically 50 mg/L silver content) were dropped on the cleavage of fresh mica substrate.…”

Section: Atomic Force Microscopy (Afm) Studiesmentioning

confidence: 99%

Functionalized Sepiolitic Clay Nanofibers as a Natural Ingredient in Medical Cosmetics

Benli

Gönül

2021

Journal of the Turkish Chemical Society Section A: Chemistry

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Medical clay, also known as medicinal clay, was first used in Mesopotamia around 2500 BC and is still a relevant topic today. Among typical medical clays, sepiolite, a fibrous clay in the family of palygorskite is often ignored by cosmetic brands as it is not found abundantly in nature as much as other clays like bentonite. However, much of the world reserves of this clay are in Turkey. In this study, antibacterial sepiolite clay was prepared from nanosilver added dispersed sepiolite samples. These Ag-nanoparticles (Ag-NPs) were formed according to green synthesis under microwave heating using the additives like alginate polymer and ascorbic acid later these fibers were put through serial dilution antibacterial tests using gram +/-bacteria (ATCC 25922 and ATCC 25923) for general quality control and determining minimum inhibitory concentrations. Although the best antibacterial clay samples (Ag-NPs have theoretically 30 mg/L of silver content) were washed at least five times with distilled water, it was observed that their antibacterial stability was still maintained. Finally, the morphology of sepiolite fibers smaller than 40 nm was characterized by AFM images show that highly dispersed single fibers can be used as a natural raw material and have a great opportunity in the development of new products in the cosmetic and medical sector.

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“…Size Measurement Procedure: The depositing procedure on high-quality mica was previously defined for sepiolite fibers [24], montmorillonite, and smectite type clay minerals [25,26]. To spread precipitated Fe and Zn suspension (0.1 g in 50 ml H2O), a dilute suspension of 1 ml was dropped on the freshly cleaved mica surface followed by drying the sample in a Petri dish at room conditions for 24 hours.…”

Section: Atomic Force Microscopy (Afm) Imaging Andmentioning

confidence: 99%

Recovery of ZnO from lead-zinc flotation tailings by hydrometallurgical processes: XRD, SEM, and AFM studies

Perek¹,

Benli²,

Arslan³

et al. 2020

J Min & Metal A Mining

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The hydrometallurgical route of zinc hydroxide and synthesis of nanocrystalline ZnO is a particularly attractive method to recover oxidized lead and zinc from lead-zinc flotation tailings. In Turkey, lead-zinc complex/mixed ores along with high iron content are not suitable for conventional mineral processing methods and need hydrometallurgical treatments. Therefore, the control of iron during zinc processes is really important. In this study, hydrometallurgical process route for zinc recovery from Pb-Zn flotation tailings was investigated by considering the effects of H2SO4 concentration, leaching and roasting temperatures on the zinc dissolution considering the Eh-pH variations. The iron and zinc products were also individually examined by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) images in order to compare before and after leaching, precipitation and roasting steps. 83.1% Zn and 91.6% Cd leaching efficiencies were obtained from Pb-Zn flotation tailing particles with the size range of 50-110 nm from AFM image cross-sections, while lead and iron were not dissolved. Elemental sulfur started to form and produce a layer around the particles or a partially agglomerated particle in the size of 170 nm during the sulphuric acid leaching. However, majority of the particles was determined to be less than 20 microns, and AFM images showed that the size reduction between the leached and unleached particles was over 50%. Selective precipitations of iron and zinc in the form of hydroxide were performed in high recovery efficiencies of 90.1% and 99%, respectively. After the heat treatment, nanocrystalline zincite clusters of 96.6% purity were produced in the ZnO mineral form and nearly 13 nm in size. Zinc can be successfully recovered and a flotation tailings ore can be a good candidate for the production of high technology needs of nanocrystalline ZnO nanoparticles.

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Effects of humic acid release from sepiolite on the interfacial and rheological properties of alkaline dispersions

Cited by 10 publications

References 25 publications

Sepiolite and sepiolite-bound humic acid interactions in alkaline media and the mechanism of the formation of sepiolite-humic acid complexes

Sepiolite and sepiolite-bound humic acid interactions in alkaline media and the mechanism of the formation of sepiolite-humic acid complexes

Functionalized Sepiolitic Clay Nanofibers as a Natural Ingredient in Medical Cosmetics

Recovery of ZnO from lead-zinc flotation tailings by hydrometallurgical processes: XRD, SEM, and AFM studies

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