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- 저자 : Devaraj Manoj (검색결과 3 건)
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Devaraj Manoj,Saravanan Rajendran,Tuan K.A. Hoang,Sabah Ansar,주상우,Yasser Vasseghian,Matias Soto-Moscoso 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Three-dimensional (3D) metal–organic frameworks (MOFs) a class of porous materials with tunablestructure and surface functionality has arisen as electrode materials especially, for electrochemical sensingof analytes. However, MOFs possess intrinsic drawbacks such as poor conductivity with an agglomerationof particles, which restricted the electrochemical signal response in terms of sensitivity anddetection limits. In this regard, the present work aims to develop conducting Cu-MOF on HNTs, a goodsubstate for in-situ growth of MOF nanostructures due to the existence of abundant negatively chargedSi-OH that can help the growth of nanosized MOFs. The negatively charged siloxane (Si-O-Si) groupson the surface of HNTs can be attracted by positive charged Cu2+ ions present in the reaction mixturethrough strong electrostatic attraction. When subjected to hydrothermal treatment, the Cu2+ ions canform nano-sized Cu-MOF particles with assistance from 2-methylimidazole. Moreover, the presence ofgraphene oxide (GO) can improve the electrical conductivity, large surface area, and thus resulting inthe formation of conducting Cu-MOF/HNTs/rGO nanocomposite. Owing to the synergetic desirable propertiesof active metal sites and high porosity offered by Cu-MOF, the high conductivity of rGO, and thelarge surface area of HNTs, the resultant Cu-MOF/HNTs/rGO modified GC electrode demonstrates superiorelectrochemical signal response towards dopamine and paracetamol. Moreover, the developed sensorexhibits wide linear ranges of 0.1 lM–130 lM and 0.5–250 lM, with a low detection limit of 0.03 lMand 0.15 lM for dopamine and paracetamol, respectively.
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Carbon‑based microelectrodes for environmental remediation: progress, challenges and opportunities
Devaraj Manoj,Rajendran Saravanan,Atchudan Raji,Arumugam Thangamani 한국탄소학회 2023 Carbon Letters Vol.33 No.6
The need for high-performance environmental remediation has increased due to the environment’s ongoing degradation in the form of significant growth in industrialization and urbanization. Therefore, the toxic heavy metals can easily enter into environmental as well as foods and thus the search of clean water for drinking, household and irrigation purposes is of crucial importance. To meet this challenge, microelectrodes are flexible, low-cost and easier for fabrication has become the strong role in the detection of heavy metals with high sensitivity towards higher adsorption of heavy metals from contaminated water. To improve the sensitivity of the microelectrodes, carbon-based microelectrodes decorated with nanomaterials have been explored for the detection of metal ions thereby their presence in trace levels can be estimated. The aim of the present review is to summarize the recent developments in carbon-based microelectrodes for the electrochemical determination of heavy metals. It is followed by the various nanomaterials decorated on the carbon microelectrodes for detection of heavy metals was systematically discussed. Finally, the application and the future perspectives in the development of smart electrochemical sensing is provided. This short review will provide the useful information for the recent development in microelectrodes and also guide the pathway for the detection of heavy metals.
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Atchudan Raji,Perumal Suguna,Sundramoorthy Ashok K.,Manoj Devaraj,Kumar Raju Suresh,Almansour Abdulrahman I.,Sangaraju Sambasivam,Lee Wonmok,Lee Yong Rok 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.6
The growing energy demand and environmental issues have encouraged the development of novel and sustainable energy. Hydrogen is one of the cleanest and most sustainable energy sources that provides an environmentally friendly alternative future fuel. The recent development in hydrogen production through electrocatalytic water-splitting is somewhat highperformance. The potential electrocatalysts play an essential role in hydrogen evolution reactions (HER) for electrochemical water splitting, where expensive and low-abundance platinum-based materials are the standard catalysts for HER. Herein, metal-free, low-cost, and naturally abundant chebulic myrobalan was employed as a source for the preparation of porous carbon by direct pyrolysis route, and the resulting porous carbon was utilized as an electrocatalyst for the production of hydrogen gas. The various analytical techniques confi rmed the existence of sulfur, nitrogen, and oxygen in the prepared chebulic myrobalan-derived porous carbon (CM-PC). The presence of eff ective heteroatoms in the CM-PC may lead to interactive eff ects between the heteroatoms and porous carbon structures; this suggests the enhancement of the electrochemical performance of HER. The surface area of CM-PC was obtained as 675 m 2 g −1 by BET measurement. The CM-PC exhibited a moderate degree of graphitization with hydrophilic functionalities. Based on these excellent properties, the CM-PC was used as an electroactive material to fabricate the working electrode and as a metal-free electrocatalyst for HER in a 0.5 M H 2 SO 4 aqueous solution. The resulting CM-PC delivered a superior catalytic activity toward HER with a Tafel slope of ~ 79 mV decade –1 (Overpotential − 166 mV RHE at a current density of − 10 mA cm –2 ) and excellent long-term stability in an acidic medium. Importantly, these fi ndings prove that the chebulic myrobalan (biomass) was turned into an eff ective electrocatalyst for hydrogen generation in the economical route, thereby challenging the uniqueness of platinum catalysts in the hydrogen economy. The result indicates that as-prepared catalysts (CM-PC) have excellent application value in energy and environment.
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