Major, trace and rare earth element (REE) geochemistry of different colored fluorites in the Bobrynets region, Ukraine

Şaşmaz, Ahmet; Kryuchenko, N.O.; Zhovinsky, E.Ya.; Suyarko, Vasily; Konakci, Nevin; Akgül, Bunyamin

doi:10.1016/j.oregeorev.2018.09.014

Cited by 34 publications

(24 citation statements)

References 43 publications

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“…Parallel results were also reported by different researchers ( Bhati et al, 2019 ; Islam et al, 2019 ). I:ZnO proved to be an efficient catalyst under the existing situation of environmental pollution with heavy metal ions and other toxic pollutants ( Sasmaz et al, 2016 ; Sasmaz and Sasmaz, 2017 ; Yildirim and Sasmaz, 2017 ; Igwe and Nwamezie, 2018 ; Palutoglu et al, 2018 ; Sasmaz et al, 2018 ; Deeba et al, 2019 ; Iwuoha and Akinseye, 2019 ; Adetutu et al, 2020 ; Awwad et al, 2020 ). There is a dire need to develop and utilize an efficient photocatalyst which is active under solar light irradiation since it is cost-free to be used for effluent treatment ( Ashar et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…Until now, many physical, chemical, and biological processes have been tried for effluent treatment. However, socioeconomic and environmental issues associated with these technologies are a huge hurdle in application of these methodologies for Cr(VI)-containing effluent treatment ( Ukpaka, 2016 ; Legrouri et al, 2017 ; Palutoglu et al, 2018 ; Sasmaz et al, 2018 ; Khan N. A. et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Solar Photocatalytic Activity of Thermally Stable I:ZnO/Glass Beads for Reduction of Cr(VI) in Tannery Effluent

et al. 2022

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Chromium (VI) in tannery effluent is one of the major environmental concerns for the environmentalists due to the hazardous nature of Cr(VI) ions. To reduce Cr(VI) to Cr(III) as an innocuous moiety, pure and I-doped ZnO was grafted over the etched surface of glass beads by successive ionic layer adsorption and reaction (SILAR). Powdered, pure, and I-doped ZnO scrapped from the surface of glass beads was characterized for crystallinity, morphology, and elemental composition by XRD, SEM, TEM, and EDX. The optical properties of both photocatalysts revealed that owing to optimized iodine doping of ZnO, reduction in the bandgap was observed from 3.3 to 2.9 eV. The crystalline nano-bricks of I:ZnO adhered to glass beads were investigated to have remarkable capability to harvest sunlight in comparison to intrinsic ZnO nanodiscs. The thermal stability of I:ZnO was also found to be much improved due to doping of ZnO. The photocatalytic activities of ZnO/GB and I:ZnO/GB were compared by extent of reduction of Cr(VI) under direct natural sunlight (600–650 KWh/m2). The disappearance of absorbance peaks associated with Cr(VI) after treatment with I:ZnO/GB confirmed higher photocatalytic activity of I:ZnO/GB. The reaction parameters of solar photocatalytic reduction, i.e., initial pH (5–9), initial concentration of Cr(VI) (10–50 ppm), and solar irradiation time (1–5 h) were optimized using response surface methodology. The solar photocatalytic reduction of Cr(VI) to Cr(III) present in real tannery effluent was examined to be 87 and 98%, respectively, by employing ZnO/GB and I:ZnO/GB as solar photocatalysts. The extent of reduction was also confirmed by complexation of Cr(VI) and Cr(III) present in treated and untreated tannery waste with 1, 5-diphenylcarbazide. The results of AAS and UV/vis spectroscopy for the decrease in concentration of Cr also supported the evidence of higher efficiency of I:ZnO/GB for reduction of Cr(VI) in tannery effluent. Reusability of the fabricated photocatalyst was assessed for eight cycles, and magnificent extent of reduction of Cr(VI) indicated its high efficiency. Conclusively, I:ZnO/GB is a potential and cost-effective candidate for Cr(VI) reduction in tannery effluent under natural sunlight.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Solar Photocatalytic Activity of Thermally Stable I:ZnO/Glass Beads for Reduction of Cr(VI) in Tannery Effluent

et al. 2022

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“…Stage I fluorite and/or calcite may be partially dissolved to form (part of) the source of Stage II fluorite, which caused the higher total REE contents of the latter. The Tb/Ca versus Tb/La diagram (Figure b) is used to differentiate the fluorite genesis (Möller et al, ; Sánchez et al, ; Sasmaz et al, ; Subías & Fernández‐Nieto, ) and shows that the Madiu fluorite data fall entirely within the hydrothermal deposit field. The overlapping of Y/Ho ratios of the Madiu fluorite (27.0 to 39.7) with those of typical hydrothermal fluorite (<200) further supports a hydrothermal origin for the Madiu deposit (Bau & Dulski, ).…”

Section: Discussionmentioning

confidence: 99%

“…The Y/Ho versus La/Ho diagram has been widely used to shed light on the evolution of fluorite ore formation (Bau & Dulski, 1995;Deng, Gong, et al, 2014;Mondillo et al, 2016;Pei et al, 2017). In the diagram (Figure 10a (Figure 10b) is used to differentiate the fluorite genesis (Möller et al, 1976;Sánchez et al, 2010;Sasmaz et al, 2018;Subías & Fernández-Nieto, 1995) for the Madiu deposit (Bau & Dulski, 1995).…”

Section: Samarium-neodymium Isotopesmentioning

confidence: 99%

Formation timing and genesis of Madiu fluorite deposit in East Qinling, China: Constraints from fluid inclusion, geochemistry, and H–O–Sr–Nd isotopes

Pei

Zhang

et al. 2019

Geological Journal

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The Heyu fluorite ore district is newly discovered in the East Qinling metallogenic belt (EQMB), central China. In this district, the large Madiu fluorite deposit contains five Mesozoic granite‐hosted orebodies. The deposit may have formed at shallow depth and occurred as continuous veins controlled by a series of N‐S‐ or NE‐trending, steeply dipping faults. The fluorite mineralization can be divided into two stages (I and II). Fluid inclusions in stage I fluorite homogenized at 132.2°C to 342.5°C (peak at 170°C–210°C) with salinities of 0.18 to 4.43 wt% NaCl equiv, whilst those in stage II fluorite homogenized at 122.2°C to 305.7°C (peak at 130°C–170°C) and salinities of 0.18 to 3.71 wt% NaCl equiv. Raman spectroscopic analysis of the fluid inclusions reveals that they comprise predominantly H2O. The rare earth element (REE) characteristics indicate that the deposit is of hydrothermal origin. The δ18OH2O (−8.8‰ to −0.5‰) and δDH2O (−69.0‰ to −61.9‰) values show a subhorizontal trend, suggesting that the oxygen isotopic compositions were modified by fluid–rock interactions. Fluid inclusion and stable isotopic data suggest that the ore‐forming fluids belong to a meteoric water‐sourced, medium–low temperature, and low salinity NaCl–H2O system. Initial fluorite 87Sr/86Sr ratios (0.708879–0.709682) resemble those of the Heyu batholith. The water–rock reaction, which leached Ca from the host rock and increased the fluid pH, was likely causative to the ore precipitation. Geochemical and mineralization features suggest that the Madiu fluorite deposit is best classified as a fault‐controlled hydrothermal vein‐type fluorite deposit. The Sm–Nd isochron age of 118.9 ± 7.8 Ma and its regional age correlation suggest that the fluorite mineralization occurred under regional extension or lithospheric thinning setting and that the fluorite mineralization was an important component of the Early Cretaceous mineralization event in the EQMB.

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“…The occurrence of such irregular patterns was reported initially from aqueous systems by using different terms such as 'kinked effect', 'zigzag effect', 'tetrad effect', and 'double-double effect' (Fidelis and Siekierski, 1966;Peppard et al, 1969). Ionic radius, electric charge, pH, surficial absorption, mineral phases and stability of REE-complex are believed to be the main chemical parameters controlling the REE distributions in geological environments (Sasmaz et al, 2018). McLennan (1994) declared that the…”

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confidence: 99%

Ree mobility and tetrad effects in bauxites an example from the Kanisheeteh deposit, NW Iran

Abedini¹

2019

Acta Geodynamica Et Geomaterialia

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The Kanisheeteh bauxite deposit (NW Iran) is located on the Irano-Himalaya karst bauxite belt and was developed as stratiform horizon along the contact of the Permian and Triassic Formations. Based on absolute weathering index (AWI), HREE were leached out, whereas LREE suffered both leaching and fixation during bauxitization. The non-CHARAC characteristic of Y/Ho ratios can be attributed to geochemically known phenomenon as the "tetrad effect". The simultaneous convex and concave curves of the tetrad effect were observed in the chondritenormalized REE patterns of the bauxite ores. The correlation between the sizes of T 4 and AWI% values revealed two separate populations. The first one is characterized by a wide variation in sizes of T 4 and very narrow AWI% values, and is thought to be related to acidic zone of the profile. In contrast, the second one is marked by a narrow variation in sizes of T 4 and wide variation in AWI% values, and is conceived to be affiliated to alkaline zone of the profile. In this research, the tetrad effect proved to be capable of clarifying the geochemical characteristics of the deposit and can be applied as a good geochemical index to investigate the prevailed paleoconditions of depositional environments.

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Major, trace and rare earth element (REE) geochemistry of different colored fluorites in the Bobrynets region, Ukraine

Cited by 34 publications

References 43 publications

Enhanced Solar Photocatalytic Activity of Thermally Stable I:ZnO/Glass Beads for Reduction of Cr(VI) in Tannery Effluent

Enhanced Solar Photocatalytic Activity of Thermally Stable I:ZnO/Glass Beads for Reduction of Cr(VI) in Tannery Effluent

Formation timing and genesis of Madiu fluorite deposit in East Qinling, China: Constraints from fluid inclusion, geochemistry, and H–O–Sr–Nd isotopes

Ree mobility and tetrad effects in bauxites an example from the Kanisheeteh deposit, NW Iran

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