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

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

doi:10.7251/qol1701041m

Cited by 4 publications

(3 citation statements)

References 13 publications

(13 reference statements)

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“…North Macedonia is abundant in natural inorganic non-metallic materials with a wide spectrum of potential use and application, such as diatomaceous earth (DE), perlites, bentonites, pumice, dolomite, granite, quartzite, etc. [1][2][3][4][5][6][7][8][9][10]. The clayey DE found in the proximity of the Bitola power plant, takes a special place amongst non-metallic raw materials.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation

Reka¹,

Kosanović

Ademi

et al. 2022

SCI SINTER

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The raw diatomaceous earth from the vicinity of Bitola (North Macedonia) showed low bulk density (0.61-0.69 g/cm3), high-water absorption (75-81%) and porosity (66- 72%). The chemical composition was determined with ICP-MS, revealing the following results for the diatomaceous earth: SiO2 (63.69 wt%), Al2O3 (11.79 wt%), Fe2O3 (5.95 wt%), MnO (0.15 wt%), TiO2 (0.65 wt%), CaO (1.51 wt%), MgO (2.24 wt%), P2O5 (0.13 wt%), K2O (1.64 wt%), Na2O (0.93 wt%), LOI (11.21 wt%). XRPD data of the examined sample of clayey diatomite mainly depicted crystalline behavior with a small presence of amorphous phase. The crystalline mineral phases mainly comprise: silica (quartz), feldspars (plagioclase), mica (muscovite), chlorites and dolomite. SEM and TEM results show cased presence of micro- and nanostructures with pores ranging from 250 to 600 nm. The clayey diatomite was sintered at three temperatures (900, 1000 and 1100?C) for a period of 1 h. XRPD of the sintered samples at 1100?C showed certain thermal stability and formation of new phases (mullite and tridymite) that makes the analyzed diatomaceous earth suitable for production of various types of ceramic, construction and thermal insulating materials.

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Section: Introductionmentioning

confidence: 99%

Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation

Reka¹,

Kosanović

Ademi

et al. 2022

SCI SINTER

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“…The company has a surface exploitation of fine dispersed bentonite, and manufacture several types of bentonite products with high quality: alkali-activated bentonite, casting grade bentonite, drilling mud bentonite, injecting grade bentonite, bentonite grade used for pelletizing processes of the ore concentrates, and as filter ( Figure 2). In order to determine the composition, structure and properties, the bentonite clay mined from these deposits was the subject of many studies and examinations (Atkovska et al, 2016;Boševska 1980;Brezovska;1996;Brezovska et al, 2004Brezovska et al, , 2005Memedi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the particle size fractions of bentonite clay from Ginovci, Republic of North Macedonia

Boškovski¹

2020

GEOL

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“…Будући да адсорпција може бити реверзибилна, адсорбенти се могу регенерисати одговарајућим процесима десорпције и поново користити. Многи материјали, попут глине, зеолита, активног угља, перлита, оксида метала и у новије вријеме наноматеријала, користе се као адсорбенси за уклањање тешких метала из водених система (Jakupi et al 2016;Memedi et al 2017;Marinkovski et al 2019).…”

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Biomass application as a sorbent for adsorption of heavy metals from aqueous solutions

Lisichkov,

Atkovska,

Kuvendziev

et al. 2023

ORUPRS

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The increase of the population and the industrial development, lead to enormous environmental pollution. Various types of waste containing heavy metals are produced and discharged into water resources. Heavy metals are considered to be the main source of contamination that causes serious environmental problems. The polluted water becomes unusable and threatens the human health and the ecosystem. Toxicity and non-biodegradability of heavy metals, as well as their tendency to accumulate in soils, water resources and living organisms, makes them significant environmental pollutants. Removing heavy metal ions from water resources has been a challenge for a long time. Modern eco-process engineering emphasizes the need for appropriate and sophisticated methods for the natural and wastewater treatment, regardless of the geogenic or anthropogenic origin of the source of pollution. The most commonly used methods for elimination of heavy metals from aqueous solutions are: chemical deposition, membrane processes, electrodialysis and adsorption. Most of these methods are significantly expensive when treating large amounts of water, ineffective at low concentrations of metals, and produce large amounts of other toxic products that require adequate removal and disposal. Among these proposed processes, adsorption is the most commonly used and is considered to be an effective, efficient and economical method for water purification. The sustainable development of separation processes is focused on development of modern, bioseparation techniques for elimination of toxic metals from wastewater using unconventional sorbents with low commercial cost. Bisorption is an environmentally friendly alternative method that has advantages over conventional methods. Large quantities of natural waste materials, such as agro-waste and food industry by-products, can be applied as a potential biosorbents for the removal of heavy metals. In order to increase their adsorption capacity, biosorbents can be physically or chemically modified. Modelling and optimization of the process of biosorption of heavy metals (Mn(II), Fe(II), Ni(II), Cr(VI) and Pb(II)) from water resources through application of natural and modified biosorbents of domestic origin, has been performed in the frame of this work, as an alternative bioseparation technique. From theexamined potential biosorbents, rice husks and peanut husks, as well as their modified forms, showed the best biosorption affinity for the analyzed heavy metals. On the efficiency of removal of heavy metals from aqueous solutions, the influence of the following operating parameters has been investigated: pH value, initial adsorbate concentration and biosorption time. This work contains a detailed literary review, optimal biomass selection, characterization of the used natural and modified biosorbents.Modeling and analysis of the equilibrium, kinetics and dynamics of the investigated systems, was aslo conducted, using sophisticated computing tools and process simulators.

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

Cited by 4 publications

References 13 publications

Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation

Fabrication of ceramic monoliths from diatomaceous earth: effects of calcination temperature on silica phase transformation

Characterization of the particle size fractions of bentonite clay from Ginovci, Republic of North Macedonia

Biomass application as a sorbent for adsorption of heavy metals from aqueous solutions

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