Evgenios Kokkinos

Evgenios Kokkinos
Aristotle University of Thessaloniki | AUTH · Department of Chemical Engineering

PhD

About

24
Publications
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167
Citations

Publications

Publications (24)
Article
Full-text available
Arsenic poisoning constitutes a major threat to humans, causing various health problems. Almost everywhere across the world certain “hotspots” have been detected, putting in danger the local populations, due to the potential consumption of water or food contaminated with elevated concentrations of arsenic. According to the relevant studies, Asia sh...
Chapter
This chapter summarizes the recent advances in the development and evaluation of biomass-derived nanocomposites consisting of a carbon-based network and inorganic nanoparticles distributed on it. The preparation routes and the typical properties of the raw, thermally treated, and modified biomass substances are first described and then, extended to...
Article
Full-text available
Mercury is a highly toxic pollutant of major public health concern, and human exposure is mainly related to the aqueous phase, where its dominant form is methyl-mercury (MeHg). In the current work, two carbon-based adsorbents, i.e., a commercial activated carbon and a sunflower seeds’ biochar, were modified by the introduction of thiol-active group...
Article
Full-text available
Grecian Magnesite S.A., located in Gerakini, Chalkidiki, N. Greece, is a magnesite mining company, which produces and commercializes several Mg-based products. For production purposes, water is applied in large quantities for several uses. As a result, 5 × 106–7 × 106 m3 of wastewater, consisting mainly of muddy water, is produced from the magnesit...
Conference Paper
Full-text available
Grecian Magnesite S.A. (GM) is a magnesite mining company, which produces and commercializes several Mg-based products, such as Caustic Calcined Magnesia (CCM), Dead-Burned Magnesia (DBM), magnesium carbonate (raw magnesite) and basic monolithic refractories. GM's major deposits and production facilities are in Gerakini, Chalkidiki, N. Greece. In t...
Article
Full-text available
A magnetic nanocomposite, consisting of Fe3O4 nanoparticles embedded into a Mg/Al layered double hydroxide (LDH) matrix, was developed for cancer multimodal therapy, based on the combination of local magnetic hyperthermia and thermally induced drug delivery. The synthesis procedure involves the sequential hydrolysis of iron salts (Fe 2+ , Fe 3+) an...
Article
Full-text available
A combination of thermal (500–750 °C in air) and hydrometallurgical (acidic) treatments have been applied to dried tannery sludge, resulting in the initial conversion of Cr(III) to Cr(VI) and its subsequent leaching as wastewater with high Cr(VI) concentration content (3000–6000 mg/L), presenting an extraction efficiency over 90%. The optimal elect...
Chapter
In tanning procedures, the main and most widely currently used reagent for skin/hide treatment is the trivalent chromium salt (usually the sulfate one). However, the low yield of the reactions, taking place in the respective chromium bath, commonly results in a significant proportion of this metal, passing unused into the corresponding wastes (most...
Article
Full-text available
The surface configuration of tetravalent manganese feroxyhyte (TMFx) was appropriately modified to achieve higher negative surface charge density and, hence, to improve its efficiency for the removal of dissolved Cd and Pb mostly cationic species from water at pH values commonly found in surface or ground waters. This was succeeded by the favorable...
Article
Full-text available
Tanneries produce significant quantities of hazardous waste/waters and, according to international environmental organizations, their further recycling/reuse/exploitation in the context of circular economy is considered mandatory. A relevant case study is the recovery of Cr(III), used in large amounts during the tanning process, which can be recove...
Conference Paper
Full-text available
The effluent of tanneries is a hazardous waste and a combination of physical-chemical and biological techniques is required for its treatment. As a result of the previous processes, a sludge with high chromium content is produced. So, the aim of this study is the hydrometallurgical recovery of chromium in the context of a circular economy. Accordin...
Article
Tannery sludge, produced during the treatment of tanning effluents, is considered as hazardous waste, since it contains significant amounts of leachable Cr(III) and organic matter, according to the respective legislation. Following the EU general environmental protection guidelines, both chromium and energy recovery are strongly recommended, by app...
Article
Full-text available
The implementation of nanotechnology in drinking water treatment is a very promising field for applied research. A major part of this effort focuses on the reduction of the dimensionality of the conventional cost-effective adsorbents that have been successfully used for decades. The development of engineered nanoparticles has the potential to provi...
Chapter
The implementation of nanotechnology in drinking water treatment is a very promising field for applied research. A major part of this effort focuses on reducing the building units dimensions in the existing inorganic adsorbents used for the purification of water versus heavy metal species. The development of engineered nanoparticles has the potenti...
Article
Full-text available
Calcium peroxide (CP) has been widely applied in environmental remediation, but few studies have reported its application in controlling Microcystis blooms. To recognize its feasibility for mitigating Microcystis blooms, the properties of CP in terms of hydrogen peroxide (HP) release and phosphate removal were investigated at different CP doses, te...
Patent
The present invention relates to a method of producing an adsorbant consisting of a single phase of tetravalent manganese feroxyhite (6-Fe(i.X)MnxOOH) with a negatively charged particle surface, in which a portion of the iron has been isomorphically substituted by manganese atoms at a proportion of 0.05-25%. Its production is performed in a two con...
Patent
The present invention refers to the method for synthesis an absorbent material consisting of a phase of tetravalent manganese feroxyhyte (δ-Fe(1-x)MnxOOH) with a negatively charged grain surface in which a percentage of iron-has been isomorphically substituted by manganese atoms at 0,05-25%. Its' production is carried out in two continuous flow sti...
Article
Novel adsorbents consisting of ZnFe2O4/Zn5(OH)6(CO3)2 (hydrozincite) nanocomposite materials were studied for efficient As(V) removal from water. Nanocomposites were synthesized by the co-precipitation of Zn and Fe salts in alkaline conditions. Depending on the Zn/Fe molar ratio, a variety of materials was produced with different ZnFe2O4/Zn5(OH)6(C...
Article
Mercury abatement, especially in coal combustion and waste incineration units, is an important issue in the context of the environmental protection measures. Although the activated carbon injection (ACI) in flue gases is the almost exclusively applied technology, a lot of research is under way to find materials and methods that could replace this t...
Article
Full-text available
This study evaluates the efficiency of iron-based oxy-hydroxides to remove antimony from groundwater to meet the requirements of drinking water regulations. Results obtained by batch adsorption experiments indicated that the qualified iron oxy-hydroxide (FeOOH), synthesized at pH 4 for maintaining a high positive charge density (2.5 mmol OH−/g) ach...
Article
An innovative material, namely Tetravalent Manganese Feroxyhyte (TMFx), was synthesized and tested for its capacity to capture elemental mercury, Hg(0), from boiler flue gases. TMFx presents characteristics well-suited for this purpose, since it incorporates high oxidation capacity, high surface area and high negative surface charge density. Result...
Article
This study demonstrates an optimization procedure for the development of an Hg-specified adsorbent able to comply with the regulation limit for drinking water of 1μg/L. On this purpose, the synthesis of Mn(IV)-feroxyhyte was modified to achieve high negative charge density by combining alkaline and extreme oxidizing conditions. In particular, preci...
Article
In this study, single iron oxyhydroxides (FeOOH) and binary iron/manganese (FeMnOOH) oxyhydroxides were used to serve as potential mercury adsorbents. The selection of the optimum adsorbent and the corresponding conditions of the synthesis was based not only on its maximum Hg(II) adsorption capacity but also on its ability to achieve the mercury he...

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Projects

Projects (3)
Project
It is our pleasure to announce the International Conference on Raw Materials and Circular Economy (“RawMat2021”) which will be held in Athens, Greece, from 5 to 9 September, 2021. RawMat2021 is organized by the Technical Chamber of Greece, the School of Mining and Metallurgical Engineering of the National Technical University of Athens and the Greek Raw Materials Cluster (GRawMat). Following the demands and trends of modern society, RawMat2021 shall address a wide range of technological developments and future challenges regarding Raw Materials with emphasis given on Circular Economy aspects. RawMat2021 aims to bring together the Academic community, engineers, early-stage scientists as well as senior scientists, industry executives, stakeholders and policy makers, and other professionals in the field of raw materials for a comprehensive, cross-discipline exchange of knowledge. RawMat2021 shall provide an excellent opportunity for shared presentation of common interest that encompasses and promotes interactive dialogue on the recent advances, innovations and trends in the field of raw materials. RawMat2021 shall promote new tools, methods, research findings, methodological frameworks and hypotheses as well as innovative ideas to be presented in its scientific and technical sessions.
Project
This Special Issue focuses on the promotion of sustainable technologies for water treatment which succeed economic viability and competence with minimum environmental impact. Since water scarcity and contamination are emerging issues in many regions wolrdwide, securing new water resources through reuse or remediation strategies has turn into a mandatory task of high importance. The need to develop novel approaches gets more intense as international and local authorities adopt strict leglislations related not only to pollutant levels in water but also to the total outcome of the employed processes in the environment. For instance, a well-defined and very efficient water treatment method may become invalid through the prism of the upcoming demands for integrated sustainability and documented life cycle analysis. After that, the cost of the process, which was traditionally defined by the value of the used materials, chemicals, facilities, and energy, may be determined by the ability to fulfill an environmental footprint target that is set each time. From this point of view, research on the design of modern processes or on the proper modification of existing ones will serve as the building substrate towards a new era of symbiosis between human activities and the environment. Prof. Dr. Anastasios Zouboulis Dr. Konstantinos Simeonidis Dr. Evgenios Kokkinos Guest Editors
Project
A special issue of Water (Current Impact Factor: 2.069). This special issue belongs to the section "Water and Wastewater Treatment" More information: http://www.mdpi.com/journal/water/special_issues/heavy-metal-removal-technologies Print Special Issue Flyer: http://www.mdpi.com/journal/water/special_issue_flyer_pdf/heavy-metal-removal-technologies/web