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Vijayarohini Parasuraman,Akter Mst Sharmin,Seungdo Kim 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
When liquid essential oils are exposed to the environment in the air, they oxidize easily and lose their therapeutic effect. In this work, linalool nanocapsules loaded with essential oil were prepared by the encapsulation method. The effect of adding different concentrations of crosslinker (1.25%, 2.5%, 5% CaCl₂) was also studied. The morphology, swelling index and inhibitory activity were also evaluated. The encapsulation of linalool in the biocapsules was increased by increasing the amount of essential oil from 71.33 to 92.2%. In the PBS medium, the swelling index is about three times higher. The high antibacterial activity of linalool loaded biocapsules was more potent against Escherichia coli in 2 hours. The biocapsules synthesized in this study are promising candidates for long-term storage to reduce environmental bio-contamination with pathogens.
Vijayarohini Parasuraman,Muhammad Awais Aslam,Seungdo Kim 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Visible light driven carbon doped titanium dioxide (CA-TiO₂) nanoparticles have been developed by a single-pot green synthesis method by ascorbic acid as a carbon dopant. The physicochemical properties of as-prepared photocatalyst are characterized by various spectroscopic techniques (XRD, FT-IR, and UV-VIS). A simple post-pyrolysis step is applied to increase the photocatalytic activity of CA-TiO₂ under visible light. The interface combination between TiO₂ and the precursor carbon increases the specific surface of TiO₂, extends light response, and enhances its efficiency due to electron migration stimulated by white daylight. Titanium dioxide nanoparticles combined with carbon layer via surface carbonyl groups to facilitate high interactions among the interfaces is evidenced by XPS spectroscopy. This environment-friendly photocatalyst CA-TiO₂ offers a novel route for promising industrial uses because of its low cost and mass production.
Facile synthesis of carbon layered TiO2 nanocomposite for high photocatalytic activity
Vijayarohini Parasuraman,Muhammad Awais Aslam,Parasuraman Perumalswamy Sekar,Van-Quyet Nguyen,Ye eun Lee,Hojae Lee,Woo Ram Lee,Seungdo Kim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
A green synthesis route was designed to develop a visible-light-driven thin carbon layered titanium dioxide(CLT) nanocomposite using ascorbic acid as carbon precursor. The presence of a thin layer of carbon(CLT) on the TiO2 surface was observed from HR-TEM. The thickness of CLT is directly proportional to theconcentration of carbon precursor, where this CLT acts a photosensitizer for harvesting the broad band ofvisible light spectrum. CLT nanocomposite (15.485 m2/g) showed an improved surface area of 1.4 timesthat of a commercial TiO2 (7.461 m2/g). The photocatalytic activity of CLT nanocomposite was investigatedfor the volatile organic compound destruction using p-xylene pollutant in a standard ISO photocatalyticoxidation reactor under daylight. The mechanism pathway of CLT nanocomposite was followed bythe adsorption of chemical contaminants in the pores of CLT that precisely capture the contaminants captureand destruction on its surface. The electron-hole pair recombination rate of CLT nanocomposite waslower than the pristine TiO2 was evident from photoluminescence spectra. The antibacterial activity ofCLT was also studied using E. coli as a model pathogen. This environmentally friendly photocatalyst CLToffers a novel route for good industrial utilization because of its low cost and mass production.