ORCID Profile
0000-0001-9102-4013
Current Organisation
Universiti Teknologi Brunei,
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Publisher: MDPI AG
Date: 02-06-2022
Abstract: This study effectively demonstrates the sonochemical synthesis of visible-light-responsive Cu-ZnO/TiO2 ternary Z-scheme heterojunction nanocomposite photocatalyst. The as-prepared photocatalyst was comprehensively characterized by techniques including high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray analysis (EDX) and elemental dot mapping, X-ray diffraction (XRD), UV-Vis-diffuse reflectance spectroscopy (UV-Vis-DRS), Brunauer–Emmett–Teller (BET) surface area, and Fourier-transform infrared spectroscopy (FTIR). The photocatalytic activity of the Cu-ZnO/TiO2 nanocomposite photocatalyst was assessed for the degradation of Congo red (CR), an azo dye, under direct sunlight. The pseudo-first-order rate constant for CR degradation was found to be 0.09 min−1. The outcome implies that the synthesised nanocomposite photocatalyst demonstrates excellent photocatalytic activity under direct sunlight as 98% degradation of CR dye was achieved in approximately 20 min using the Cu-ZnO/TiO2 nanocomposite photocatalyst. Furthermore, its high recoverability and reusability of five times indicate its excellent catalytic potential.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9RA08971C
Abstract: C. roseus phytochemicals are physisorbed on the 111 Fe surface, and the oxygen non-bonding electron chemisorbed on the polarized state 111 Fe surface.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.ULTSONCH.2016.07.008
Abstract: In this investigation, sisal fibres were treated with the combination of alkali and high intensity ultrasound (HIU) and their effects on the morphology, thermal properties of fibres and mechanical properties of their reinforced PP composites were studied. FTIR and FE-SEM results confirmed the removal of amorphous materials such as hemicellulose, lignin and other waxy materials after the combined treatments of alkali and ultrasound. X-ray diffraction analysis revealed an increase in the crystallinity of sisal fibres with an increase in the concentration of alkali. Thermogravimetric results revealed that the thermal stability of sisal fibres obtained with the combination of both alkali and ultrasound treatment was increased by 38.5°C as compared to the untreated fibres. Morphology of sisal fibre reinforced composites showed good interfacial interaction between fibres and matrix after the combined treatment. Tensile properties were increased for the combined treated sisal fibres reinforced PP composites as compared to the untreated and pure PP. Tensile modulus and strength increased by more than 50% and 10% respectively as compared to the untreated sisal fibre reinforced composite. It has been found that the combined treatment of alkali and ultrasound is effective and useful to remove the amorphous materials and hence to improve the mechanical and thermal properties.
Publisher: IOP Publishing
Date: 04-2017
Publisher: Springer Science and Business Media LLC
Date: 09-2016
Publisher: SAGE Publications
Date: 06-08-2020
Abstract: Polypropylene (PP) composites were prepared by reinforcing with suitable hybrid fillers such as short sisal fibers treated with an alkali and high-intensity ultrasound (HIU) and halloysite nanotubes (HNTs) modified with 3-aminopropyltriethoxysilane. The synergistic effect of surface-treated short sisal fibers and silane-grafted HNTs were systematically evaluated through morphological, mechanical, dynamic mechanical, and thermal characterization. Alkali and HIU treatments of short sisal fibers drastically enhanced the interaction between sisal fibers and silane-grafted HNTs, which improved the interfacial adhesion between the filler system and the PP matrix. Scanning electron microscopic images indicated the continuity and smoothness of the hybrid composite surfaces. Dynamic mechanical analysis confirmed improved interactions between the hybrid filler system and the matrix, leading to significantly enhanced storage modulus in the hybrid composites. Therefore, the interfacial adhesion between the fillers and the matrix plays a significant role in improving the mechanical, dynamic mechanical, and thermal properties of polymer composites.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2MA01054B
Abstract: Figure A depicts the electrostatic energy in edge functional groups with non-bonding electrons and suggests an interaction with the metal surface. Figure B shows protonated electrostatic energy that indicates the donation of a pair of electrons to the metal surface.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9RA00106A
Abstract: Neodymium-decorated graphene oxide is chemisorbed by non-bonding electrons on Ti6Al4V surface increasing the corrosion inhibition in acidic media.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA08766A
Abstract: Terbium functionalized graphene oxide interacted with an Mg 2+ surface by the active side of GO.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.SCITOTENV.2019.136373
Abstract: Oil and grease, carbohydrate, protein, and lignin are the main constituents of high strength wastewaters such as dairy wastewater, cheese whey wastewater, distillery wastewater, pulp and paper mill wastewater, and slaughterhouse wastewaters. These constituents have contributed to various operational problems faced by the high-rate anaerobic bioreactor (HRAB). During the hydrolysis stage of anaerobic digestion (AD), these constituents can be hydrolyzed. Since hydrolysis is known to be the rate-limiting step of AD, the overall AD can be enhanced by improving the hydrolysis stage. This can be done by introducing pretreatment that targets the degradation of these constituents. This review mainly focuses on the biological pretreatment on various high-strength wastewaters by using different types of enzymes namely lipase, amylase, protease, and ligninolytic enzymes which are responsible for catalyzing the degradation of oil and grease, carbohydrate, protein, and lignin respectively. This review provides a summary of enzymatic systems involved in enhancing the hydrolysis stage and consequently improve biogas production. The results show that the use of enzymes improves the biogas production in the range of 7 to 76%. Though these improvements are highly dependent on the operating conditions of pretreatment and the types of substrates. Therefore, the critical parameters that would affect the effectiveness of pretreatment are also discussed. This review paper will serve as a useful piece of information to those industries that face difficulties in treating their high-strength wastewaters for the appropriate process, equipment selection, and design of an anaerobic enzymatic system. However, more intensive studies on the optimum operating conditions of pretreatment in a larger-scale and synergistic effects between enzymes are necessary to make the enzymatic pretreatment economically feasible.
Publisher: IOP Publishing
Date: 19-12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1RA03495B
Abstract: Gadolinium electrostatically interacts with the epoxy group of graphene oxide. Non-bonding electrons of graphene oxide enhance electron transfer between the polarized metal alloy surface and product alloy surface from the corrosive medium.
Publisher: Elsevier BV
Date: 2017
Publisher: Wiley
Date: 17-11-2021
Abstract: The recent coronavirus disease 2019 (COVID‐19) pandemic outbreak has affected the lives of people globally on many different levels. Whilst a few antiviral drugs have been recommended for COVID‐19, there are no dedicated drugs available for this disease, yet. A virus pandemic could potentially induce severe public health threats, as well as economic and social consequences. Therefore, the discovery of effective, safe, and inexpensive antiviral agents is of great importance. Graphene has extraordinary properties. A series of successful biomedical applications involving graphene/graphene‐hybrid nanocomposites (G/GHNs) have been reported in recent years, including graphene‐based biosensor and related drug delivery system. This review is focused on the properties, synthesis routes, and applications of G/GHNs in antiviral therapy aiming to understand and highlight the unique properties of graphene and its derivatives, particularly for antiviral therapy, to evaluate and discuss the quality of graphene prepared via various preparation methods, to present the recent development of G/GHNs and their antiviral activities in prevention, detection and treatment, to offer perspective outlooks on the role of G/GHNs in antiviral therapy.
Location: No location found
Location: United Kingdom of Great Britain and Northern Ireland
Location: Japan
Location: India
No related grants have been discovered for SIVAKUMAR MANICKAM.