Multifunctional ZnFeO-based composite from iron sludge for photocatalytic degradation of azo, thiazine, anthraquinone dyes, formaldehyde and oil sorption from aqueous media
Valentin Romanovski , Dmitry Kulichik , Rajiv Periakaruppan , Vanathi Palanimuthu , Natallia V. Kulinich , Vadim Popkov , Alexandr Dubina , Iryna V. Matsukevich , Vladimir Shtepa , Elena Romanovskaia
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Abstract
This paper presents the results of the study of iron‑zinc containing photocatalysts ZnFeO-NPs obtained from sediments of groundwater deironing stations by the exothermic combustion method. Three different reducing agents were examined. X-ray phase analysis showed the presence of a predominant phase ZnFe2O4 (32.7–43.5 %) in all samples, as well as a significant content of magnetite (35.0–41.4 %), which confirms incomplete oxidation of iron during the synthesis, which correlates with thermodynamic calculations. The study of morphology revealed aggregated structures with a particle size of >20 nm. The photocatalytic activity of the studied materials was analyzed using the example of the destruction of four dyes of different nature and formaldehyde. The best ZnFeO-U sample showed 98.7 % purification efficiency at a dose of 3000 mg/L for 45 min, which was 7.2 % higher than the control sample synthesized from pure reagents. Oil absorption capacity tests demonstrated that ZnFeO-G has the highest sorption capacity (5.598 g/g), increasing by 33 % after 5 regeneration cycles. Contact angle analysis revealed dual wettability, with ZnFeO-G being most oleophilic. Antibacterial studies revealed suppression of Pseudomonas aeruginosa growth (inhibition zone 19 ± 2 mm) at a concentration of 25 μg/mL, approaching the efficiency of a standard antibiotic (22 ± 0.1 mm). The obtained ZnFeO-containing nanomaterials have multifunctional properties and are promising for use in the field of wastewater treatment and oil pollution removal.
期刊介绍:
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies