Removal of Cr(VI) From Water Resources by Using Different Raw Inorganic Sorbents

Memedi, Hamdije; Atkovska, Katerina; Lisichkov, Kiril; Marinkovski, Mirko; Kuvendžiev, Stefan; Bozinovski, Zoran; Reka, Arianit A.

doi:10.7251/qol1603077m

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…The appearance of the complex positioned "bump" between 15 and 28° (2θ) is attributed to the transformation of the crystalline mass into aluminosilicate glass. During the thermal treatment of clayey diatomite, a slight decrease of the quartz phase was monitored (at 1200°C), but formation of two new phases was evidencedmullite (maxima at 16…”

Section: X-ray Powder Diffraction Analysis Of Thermally Treated Clayey Diatomite Samplesmentioning

confidence: 99%

“…It represents a biogenetic rock; grayish, soft, very light, weakly cemented, finely opal sedimentary rock [9]. The results from the physical-chemical and mineralogical-petrographic characterization show that this non-metallic raw material can be used as the basic component in the production of light insulating construction materials, thermal insulators, lightweight construction materials, for the synthesis of zeolites [15], purification of industrial waters [16], in the cement industry (as pozzolanic material) [17][18][19][20][21][22][23][24] as pesticide holder, as well as for improving the physical and chemical characteristics of certain soils.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal Treatment of Clayey Diatomite at Temperature Range 800-1200°C

Reka¹,

Pavlovski²,

Ademi³

et al. 2020

Prime Archives in Chemistry

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Trepel is the local name for a mixture of diatomaceous earth and clay minerals. It represents a greyish, soft, very light, weakly cemented, fine biogenetic sedimentary rock. The studied material is taken from the vicinity of Bitola city (Republic of Macedonia). Here, clayey diatomite was treated up to three temperature intervals (800, 1000 and 1200 o C) for a period of 1 hour. The X-ray powder diffraction results indicate the presence of both an amorphous phase and the following crystalline phases: quartz, feldspars (plagioclase), mica (muscovite) and chlorites. The results of SEM analysis revealed skeletons of alga Diatomeae with nano-pores. By thermal treatment of the samples, a gradual change in color as well as higher bulk density and compressive strength was observed. The increase of the temperature, in addition, affected the mineralogical composition and increased the presence of the amorphous phase (aluminasilicate glassy phase). SEM results of the thermally investigated samples depicted morphological changes expressed by shrinkage of the pore diameters in comparison to the initial material. The major and minor constituents were established by chemical analysis revealing the following chemical composition of raw clayey diatomite: SiO 2 (63.65 wt%), Al 2 O 3 (11.76 wt%), Fe 2 O 3 (5.93 wt%), MnO (0.13 wt%), TiO 2 (0.63 wt%), CaO (1.42 wt%), MgO (2.22 wt%), P 2 O 5 (0.11 wt%), K 2 O (1.63 wt%), Na 2 O (0.92 wt%), LOI (11.50 wt%).

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Section: X-ray Powder Diffraction Analysis Of Thermally Treated Clayey Diatomite Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Treatment of Clayey Diatomite at Temperature Range 800-1200°C

Reka¹,

Pavlovski²,

Ademi³

et al. 2020

Prime Archives in Chemistry

View full text Add to dashboard Cite

show abstract

“…The appearance of the complex positioned "bump" between 15 and 28° (2θ) is attributed to the transformation of the crystalline mass into aluminosilicate glass. During the thermal treatment of trepel, a slight decrease of the quartz phase was monitored (at 1200°C), but formation of two new phases was evidenced -mullite (maxima at 16…”

Section: X-ray Powder Diffraction Analysis Of Thermally Treated Trepementioning

confidence: 99%

“…It represents a biogenetic rock; grayish, soft, very light, weakly cemented, finely opal sedimentary rock [9]. The results from the physical-chemical and mineralogicalpetro graphic characterization show that this non-metallic raw material can be used as the basic component in the production of light insulating construction materials, thermal insulators, lightweight construction materials, for the synthesis of zeolites [15], purification of industrial waters [16], in the cement industry (as pozzolanic material) [17][18][19][20][21][22][23][24] as pesticide holder, as well as for improving the physical and chemical characteristics of certain soils.…”

Section: Introductionmentioning

confidence: 99%

Effect Of Thermal Treatment Of Trepel At Temperature Range 800-1200˚C

et al. 2019

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Trepel is the local name for a mixture of diatomaceous earth and clay minerals. It represents a greyish, soft, very light, weakly cemented, fine biogenetic sedimentary rock. The studied material is taken from the vicinity of Bitola city (Republic of Macedonia). Here, trepel was treated up to three temperature intervals (800, 1000 and 1200C) for a period of 1 hour. The X-ray powder diffraction results indicate the presence of both an amorphous phase and the following crystalline phases: quartz, feldspars (plagioclase), mica (muscovite) and chlorites. The results of SEM analysis revealed skeletons of alga Diatomeae with nano-pores. By thermal treatment of the samples, a gradual change in color as well as higher bulk density and compressive strength was observed. The increase of the temperature, in addition, affected the mineralogical composition and increased the presence of the amorphous phase (aluminasilicate glassy phase). SEM results of the thermally investigated samples depicted morphological changes expressed by shrinkage of the pore diameters in comparison to the initial material. The major and minor constituents were established by chemical analysis revealing the following chemical composition of raw trepel: SiO2 (63.65 wt%), Al2O3 (11.76 wt%), Fe2O3 (5.93 wt%), MnO (0.13 wt%), TiO2 (0.63 wt%), CaO (1.42 wt%), MgO (2.22 wt%), P2O5 (0.11 wt%), K2O (1.63 wt%), Na2O (0.92 wt%), LOI (11.50 wt%).

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“…Many materials are studied for adsorption of heavy metal ions such as red mud , silicates (Chiron et al, 2003), zeolites (Jakupi et al, 2016a, Jakupi et al, 2016b, Wingenfelder et al, 2005. Removal of hexavalent chromium, Cr(VI), is also tried with adsorbents such as activated carbon (Srivastava et al, 1996), Spirogyra Biosorbents , fl oating ashes (Bayat 2002, Gupta andAli 2004) and other different raw inorganic sorbents (Memedi et al, 2016). In recent years, the elimination of heavy metals from wastewater is achieved by using certain types of natural or agricultural waste (Chatterjee et al, 2010 andKhambhaty et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Separation of Cr(VI) From Aqueous Solutions by Natural Bentonite: Equilibrium Study

Memedi

Atkovska

Lisichkov

et al. 2017

QOL

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Removing hexavalent chromium from contaminated wastewater is very important because of toxicity to living organisms. Chromium is carcinogenic and mutagenic in very low concentration values (sub-ppm). The ability of the natural mineral (bentonite) for adsorption of hexavalent chromium, Cr(VI), from aqueous solutions was inve stigated. The infl uence of different physical and physicochemical parameters (pH, amount of adsorbent, adsorbate initial concentration) was examined. For characterization of adsorbent, classical chemical analysis thermogravimetric analysis (DTA/ TGA), XRD analysis, FTIR-analysis and determination of specifi c surface area by BET were performed. For quantitative monitoring of the dynamics of studied system for the presence of Cr(VI) ions in model solutions, the AAS and UV/ Vis analysis were used. The obtained experimental results were used for modeling of the equilibrium of the process through the application of software package MATLAB/Curve Fitting Toolbox., Following adsorption isotherms: Langmuir, Freundlich, Langmuir-Freundlich and Redlich-Peterson, are applied for analyzing the equilibrium of adsorbtion system Cr(VI) ions -bentonite.

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Removal of Cr(VI) From Water Resources by Using Different Raw Inorganic Sorbents

Cited by 8 publications

References 15 publications

Effect of Thermal Treatment of Clayey Diatomite at Temperature Range 800-1200°C

Effect of Thermal Treatment of Clayey Diatomite at Temperature Range 800-1200°C

Effect Of Thermal Treatment Of Trepel At Temperature Range 800-1200˚C

Separation of Cr(VI) From Aqueous Solutions by Natural Bentonite: Equilibrium Study

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