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Valeriia is a dedicated material scientist and engineer with a passion for driving innovative breakthroughs. She has a keen interest in exploring the diverse realms of nanomaterials. With a solid background in materials synthesis and characterization, especially for environmental applications like photocatalysis, Valeriia isn't just a scientist. She's a versatile problem solver poised to address a wide spectrum of challenges. Beyond her professional realm, Valeriia cherishes her moments wit
November 2022 - August 2023
August 2017 - October 2022
- PhD Student Researcher
- Supervisor: Dr. Cho So-Hye, Materials Architecturing Research Center at KIST, Nanomaterials Science and Engineering. Throughout my Ph.D. program, I have been involved in various aspects of research on developing photocatalysts with high performance for water purification and hydrogen production. Investigated and published original research on the synthesis and characterization of semiconductor materials with potential energy generation and environmental remediation applications.
It is widely known that semiconductors such as ZnO and ZnS tend to be unstable in water-splitting photocatalysis due to self-corrosion by the photogenerated charges under prolonged light irradiation. In this work, we demonstrate that proper engineering of photodeposition of Rh species on ZnO–ZnS heterostructure (ZnO/ZnS) can enhance their photocata...
The essential requirement for photocatalysis─utilization of sunlight energy─was addressed by combining ZnO/ZnS nanoparticles (NPs) with NaYF4:Yb3+,Tm3+ upconversion nanoparticles (UCNPs) in a core–shell composite structure that can convert near-infrared (NIR) light to UV light through energy transfer (ET). The material was examined with advanced ch...
This study established a dynamic Z-scheme driven heterostructure of ZnO-ZnS (ZnOS) nanoparticles (NPs) by sulfidation of ZnO NPs. The ZnOS composites with different atomic ratios of S/O were analyzed with multiple characterization techniques. The composite materials with a S/O atomic ratio of 1:1 yielded the best photocatalytic results for toxic Cr...
The separation of nanoparticles from a solution-based photocatalytic reaction is a significant problem in practical applications. To address the issue, we developed a new photocatalyst composite based on ZnO-ZnS heterojunction (ZnOS) embedded in polyvinyl alcohol (PVA) hydrogel, which showed satisfactory results for photocatalyst recycling. PVA-ZnO...
Toxic Cr(VI) polluted wastewater is worldwide recognized because of the wide application of chromium substances in various industrial sectors. Sustainable water pollution approaches are on demand now more than ever. In terms of Cr(VI), many homogenous and heterogenous techniques are applying to intensify its removal form water. Photocatalytic reduc...
To advance the MXene field, it is crucial to optimize each step of the synthesis process and create a detailed, systematic guide for synthesizing high-quality MXene that can be consistently reproduced. In this study, a detailed guide is provided for an optimized synthesis of titanium carbide (Ti3 C2 Tx ) MXene using a mixture of hydrofluoric and hy...
Ladder-type polysilsesquioxanes (LPSQs) containing phenyl as a high refractive index unit and cyclic epoxy as a curable unit were found to be excellent candidates for a transparent color conversion layer for displays due to being miscible with organic solvents and amenable to transparent film formation. Therefore, the LPSQs were combined with lumin...
In this study, ZnS/ethylenediamine nanosheets were obtained by solvothermal synthesis and modified into composites of ZnS and ZnO by heat treatment. Compared to pure ZnO and ZnS, the ZnS/ZnO composite showed superior photocatalytic activity towards hydrogen evolution from water (500 µmol h⁻¹ g⁻¹) and photoreduction of toxic Cr(VI) (k = 0.0078 min⁻¹...
Nowadays many studies devoted to the use of nanomaterials for the purification of water, air, the creation of self-cleaning surfaces. Grate attention also paid to textile materials with such properties. One of the most promising materials for this purpose are ZnO and TiO2 . ZnO has the advantage for covering textile materials due to the possibil...