Simple one pot green synthesis of silver-palladium bimetallic nanoparticles: A fluorescent turn-off sensor for detection of lead ions in environmental water and its photocatalytic activity Anitha Selvaraj, Kannan Mukundamurthy, Rangasamy Rajmohan, P. Tamizhdurai South African Journal of Chemical Engineering, 2025 • Utilization of simple, ecofriendly, cost effective, benign, readily available, gum extract for synthesis of bimetallic nanomaterial. • First time utility of Green synthesized bi-metallic nanoparticle for Pb 2+ sensing • Bimetallic BG-AgPd-NPs synthesized from gum extract of Bael fruit, an inexpensive nano sensor, shows high selectivity and sensitivity for detection of heavy metals Pb 2+ (1 µM) and Fe 2+ (1 µM) in environmental water. • BG-AgPd-NPs nano sensor furnish qualitative and quantitative detection of metal ion devoid of using extravagant equipment. • Further, the bimetallic BG-AgPd-NPs used as an effective catalyst for dye degradation of Toluidine blue and Rose Bengal. Eco-friendly, simple method was developed for the green synthesis of bimetallic silver-palladium nanoparticles (BG-AgPd-NPs) using bael gum (Aegel marmelos) at ambient temperature. Bael gum aqueous solution acts as reducing agent and stabilizing agent by anchoring on to the nanoparticles through the phytochemical constituents present in it. This approach is inexpensive, environmentally benign, and free of hazardous reagents or solvents. The nano particles demonstrate excellent shelf life and stability for several weeks at room temperature. The synthesized nanoparticle was characterized using UV-visible spectrophotometry, Infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction analytical techniques. The new versatile material BG-AgPd-NPs exhibit remarkable fluorescent characteristic, enabling the detection of metal ion especially Pb 2+ ions under laboratory conditions. The metal ion sensing property of BG-AgPd-NPs was assessed using a series of metal ions. The fluorescence studies exhibit excellent selectivity and sensitivity of the BG-AgPd-NPs towards the detection of Pb 2+ ions. The BG-AgPd-NPs probe showed potential for lead ion detection with a limit of detection (LOD) less than 1 µM, which is superior for the probe produced by greener route in the literature. Additionally, the nanoparticles exhibited excellent catalytic activity for dye degradation of rose bengal (RB) and toluidine blue (TB). BG-AgPd-NPs acts as a better catalyst for degradation of RB dye. The adaptability of the material for detecting metal ions in environmental water was also shown by the fluorescent sensing measurements.
Omnipotent Plant Sources Assisted Green Synthesis of Silver Nanoparticles: A Promising Chemical Sensing Tool Anitha Selvaraj, Kannan Mukunda Murthy, Rangasamy Rajmohan Journal of the Turkish Chemical Society Section A Chemistry, 2024 This article aims to analyze the various sensor applications of silver nanoparticles synthesized from green materials, particularly plant-based sources. The current shape in the field of nanotechnology is the synthesis of metal nanoparticles via environmentally friendly and more reliable green materials. The green route synthesis is found to be a promising method because of its congenial properties. It is economical, affable, and reproducible. Heavy metals have been dispersed widely in the environment, and they are well known for their virulent effects. Numerous methods are available to sense and detect those metals. The headway in the domain of nanotechnology is to synthesize AgNPs from green plants and to steer clear of the hazardous effects of metals. Efficacious synthetic routes via plant-mediated synthesized AgNPs open up easy and efficient sensing of hazardous metals in the environment. AgNPs have attracted many researchers because they have good biocompatibility and other outstanding properties. Remarkable electronic, catalytic, and optical properties have enabled AgNPs to be used as sensors in medical, biological, and chemical fields. This review highlights the application of PAGS-AgNPs as a chemical sensor for detecting heavy metals and organic compounds in the environment.
Sustainable synthesis of chromene derivatives catalysed by magnetite nanoparticle cored polyamine dendrimer Lakshmi Kannappan, Rajmohan Rangasamy Applied Chemical Engineering, 2024 Chromene derivatives are naturally occurring heterocyclic compounds used as cosmetic agents, food additives, and potential biodegradable agrochemicals. Normally, its synthesis is carried out with three component/substrates with a suitable base. Dendrimer with amine functionality has several applications in catalysis, more specifically, dendrimers having enriched amino groups with accessible void makes a significant impact in base catalysis. Moreover, polar periphery of the dendrimers may enhance the solubility of material in the reaction medium. Therefore, herein we report the base catalytic efficiency of magnetite nanoparticle supported polyamine dendrimer with enriched amine groups and peripheral carboxyl groups. Actually, magnetite supported polyamine dendrimer synthesis involves the synthesis of PAMAM G3 on magnetite nanoparticle core, followed by reduction of amide group with subsequent functionalization of carboxylic acid terminals. Further, it is used as versatile polyvalent base for the synthesis of chromene derivatives. The magnetite supported dendritic scaffold has accessible voids and polar periphery which enables them dispersible in the reaction medium. The recycle efficiency study confirms, the competency of the material to work in industrial catalysis.
Nanocatalysts and Redox Nanoparticles for Water Purification Kannappan Lakshmi, Arunasalam Sridhar, Rajmohan Rangasamy Nanomaterials for Air and Water Purification, 2024 Generally, water purification using nanomaterials involves adsorption, oxidation, and reduction. Among these processes, nanomaterials as catalysts are more prominent, as they not only remove or degrade the organic pollutants during the process of purification but also convert hazardous contaminants into nontoxic or useful pharmaceutical products. This chapter deals with nanomaterials and redox nanomaterials that are utilized as nanocatalyst in water purification. Nanocatalysts are mostly carbon-based materials, metal nanoparticles, metal oxide nanoparticles, and redox nanomaterials such as Fenton reagent and zero-valent iron nanoparticles.
Ultrasound-assisted synthesis of silica-coated magnetite material decorated with silver nanoparticles for the detoxification of 4-nitrophenol Edwin Prathibha, Rajmohan Rangasamy, Arunasalam Sridhar, Kannappan Lakshmi Applied Organometallic Chemistry, 2023 Among phenolic pollutants, 4‐nitrophenol is a common organic pollutant readily discharged in water bodies. It causes an adverse effect on the lives of human beings and aquatic species. Therefore, it is essential to remove this pollutant from water resources. Herein, we report an eco‐friendly approach for the synthesis of silica‐coated magnetite material decorated with ultra‐fine silver nanoparticles, as a magnetically recyclable catalyst for the detoxification of 4‐nitrophenol. This synthetic strategy employs only ultrasound waves throughout the preparation of catalyst material. Further, no stabilizer was added in any of the steps involved in synthesis. Initially, iron oxide nanoparticles were synthesized from ferrous sulphate heptahydrate precursor and coated with silica matrix. Subsequently, silver nanoparticles were deposited over it. Silver was chosen among the noble metal nanoparticles, as it is abundantly available and economical and exhibits good catalytic properties. This catalyst material was well characterized using HRTEM, XRD, VSM and FTIR techniques. HRTEM studies revealed that Ag nanoparticles of size between 2 and 5 nm were dispersed over the silica‐coated magnetite. The significant merits of this approach are usage of ultrasound waves, stabilizer‐free and reduced time consumption in the synthesis of catalyst. Furthermore, a facile magnetic separation of catalyst using bar magnet is noteworthy to this method. The catalyst was successfully recycled for eight times without any significant loss in the activity. This can be a promising catalyst for the treatment of wastewater contaminated with 4‐nitrophenol.
Synthetic modification of silica coated magnetite cored PAMAM dendrimer to enrich branched Aaine groups and peripheral carboxyl groups for environmental remediation Kannappan Lakshmi, Rajmohan Rangasamy Journal of Molecular Structure, 2021 Dendrimer with amine groups have several applications in gene delivery, drug delivery, metal encapsulation for catalysis and environmental remediation. Specifically, dendrimers having enriched amino groups with accessible void makes significant impact in the above fields. Besides, the carboxylic acid terminated amine dendrimers may enhance the efficacy as well. Therefore, herein we report the synthetic modification of poly(amidoamine) G3 dendrimer with magnetite core to enrich branched amine groups and peripheral carboxyl groups. To deliver this nanohybrid material, for the first-time silica coated magnetite cored poly(amidoamine) G3 dendrimer was synthesized by microwave assisted method. Subsequently amide groups present in the PAMAM have been reduced using lithium aluminum hydride to yield polyamine dendrimer namely poly (N-propylethane-1,2-diamine) G3. Further, peripheral amine groups were grafted with succinic anhydride to achieve carboxylic acid terminated dendrimer. The resulting nanomaterial was confirmed by FTIR, XRD, VSM, TGA, HRTEM and conductometry methods. In order to emphasize the structural efficacy of polyamine dendrimer, the metal ion uptake behavior has been discussed for the representative cations such as Pb2+, Cu 2+, Cr6+, Ca2+ and Ni2+ under the environmental concern. Magnetite cored polyamine dendrimer had evaluated for its recyclability test in the subsequent metal ion uptake studies and found to be satisfactory.
DUAL-FUNCTIONAL BAEL GUM STABILIZED SILVER NANOPARTICLES-A SUSTAINABLE PAPER-BASED SENSOR FOR DETECTION OF Hg 2+ IONS AND PHOTO-CATALYST FOR DYE DEGRADATION. A Selvaraj, K Mukundamurthy, R Rajmohan Rasayan Journal of Chemistry 18 (2) , 2025 2025
Simple one pot green synthesis of silver-palladium bimetallic nanoparticles: A fluorescent turn-off sensor for detection of lead ions in environmental water and its … A Selvaraj, K Mukundamurthy, R Rajmohan, P Tamizhdurai South African Journal of Chemical Engineering 52 (1), 243-257 , 2025 2025 Citations: 3
Omnipotent plant sources assisted green synthesis of Silver Nanoparticle-A promising Chemical Sensing tool A Selvaraj, KM Murthy, R Rajmohan Journal of the Turkish Chemical Society Section A: Chemistry 11 (2), 899-918 , 2024 2024 Citations: 3
Nanocatalysts and Redox Nanoparticles for Water Purification K Lakshmi, A Sridhar, R Rangasamy Nanomaterials for Air‐and Water Purification, 145-163 , 2024 2024 Citations: 1
Rose Bengal anchored silica-magnetite nanocomposite as photosensitizer for visible-light-mediated oxidation of thioethers E Prathibha, R Rangasamy, A Sridhar, K Lakshmi Journal of Cluster Science 34 (3), 1605-1614 , 2023 2023 Citations: 3
Ultrasound‐assisted synthesis of silica‐coated magnetite material decorated with silver nanoparticles for the detoxification of 4‐nitrophenol E Prathibha, R Rangasamy, A Sridhar, K Lakshmi Applied Organometallic Chemistry 37 (3), e6991 , 2023 2023 Citations: 4
Sustainable catalysis of nanocrystals: A green technology R Rangasamy, K Lakshmi, K Muthu Industrial Applications of Nanocrystals, 275-311 , 2022 2022
Synthesis of Au nanoparticles using magnetite cored polyamine dendrimer template and its green catalysis for selective oxidation of alcohols L Kannappan, R Rajmohan, P Edwin Materials Letters 301, 130257 , 2021 2021 Citations: 9
Synthesis, characterisation and photocatalytic activity of silver nanoparticles stabilised by Punica granatum seeds extract K Muthu, S Rajeswari, B Akilandaeaswari, SM Nagasundari, ... Materials Technology 36 (11), 684-693 , 2021 2021 Citations: 50
Synthetic modification of silica coated magnetite cored PAMAM dendrimer to enrich branched Amine groups and peripheral carboxyl groups for environmental remediation K Lakshmi, R Rangasamy Journal of Molecular Structure 1224, 129081 , 2021 2021 Citations: 26
Synthesis of ultrafine AuPd bimetallic nanoparticles using a magnetite-cored poly (propyleneimine) dendrimer template and its sustainable catalysis of the Suzuki coupling reaction R Rangasamy, K Lakshmi, M Selvaraj New Journal of Chemistry 45 (31), 14227-14235 , 2021 2021 Citations: 19
Synthesis of structurally enhanced magnetite cored poly (propyleneimine) dendrimer nanohybrid material and evaluation of its functionality in sustainable catalysis of … L Kannappan, R Rajmohan Reactive and Functional Polymers 152, 104579 , 2020 2020 Citations: 18
Synthesis and Characterization of Fe 3 O 4 /Carbon Dot Supported MnO 2 Nanoparticles for the Controlled Oxidation of Benzyl Alcohols E Prathibha, R Rangasamy, A Sridhar, K Lakshmi ChemistrySelect 5 (3), 988-993 , 2020 2020 Citations: 38
Immobilization of Pt nanoparticles on magnetite–poly (epoxyamine) nanocomposite for the reduction of p -nitrophenol K Lakshmi, R Rangasamy, E Prathibha, A Sridhar SN Applied Sciences 1 (9), 1121 , 2019 2019 Citations: 5
Polymer-supported eosin Y as a reusable photocatalyst for visible light mediated organic transformations A Sridhar, R Rangasamy, M Selvaraj New Journal of Chemistry 43 (46), 17974-17979 , 2019 2019 Citations: 49
DENDRITIC UNIMOLECULAR MICELLE STABILIZED Au/Pd BIMETALLIC NANOPARTICLES: SYNTHESIS AND AQUEOUS PHASE CATALYSIS R Rajmohan, E Murugan Catalysis in Green Chemistry and Engineering 1 (2) , 2018 2018
Green synthesis of silver nanoparticles using Ixora coccinea leaves extract M Karuppiah, R Rajmohan Materials Letters 97, 141-143 , 2013 2013 Citations: 174
Efficient amphiphilic poly (propyleneimine) dendrimer stabilized gold nanoparticle catalysts for aqueous phase reduction of nitrobenzene E Murugan, R Rangasamy, I Pakrudheen Science of Advanced Materials 4 (11), 1103-1110 , 2012 2012 Citations: 43
Development of stable pollution free TiO2/Au nanoparticle immobilized green photo catalyst for degradation of methyl orange E Murugan, R Rangasamy Journal of biomedical nanotechnology 7 (1), 225-228 , 2011 2011 Citations: 43
Synthesis, characterization, and heterogeneous catalysis of polymer‐supported poly (propyleneimine) dendrimer stabilized gold nanoparticle catalyst E Murugan, R Rangasamy Journal of Polymer Science Part A: Polymer Chemistry 48 (12), 2525-2532 , 2010 2010 Citations: 65
MOST CITED SCHOLAR PUBLICATIONS
Green synthesis of silver nanoparticles using Ixora coccinea leaves extract M Karuppiah, R Rajmohan Materials Letters 97, 141-143 , 2013 2013 Citations: 174
Synthesis, characterization, and heterogeneous catalysis of polymer‐supported poly (propyleneimine) dendrimer stabilized gold nanoparticle catalyst E Murugan, R Rangasamy Journal of Polymer Science Part A: Polymer Chemistry 48 (12), 2525-2532 , 2010 2010 Citations: 65
Synthesis, characterisation and photocatalytic activity of silver nanoparticles stabilised by Punica granatum seeds extract K Muthu, S Rajeswari, B Akilandaeaswari, SM Nagasundari, ... Materials Technology 36 (11), 684-693 , 2021 2021 Citations: 50
Polymer-supported eosin Y as a reusable photocatalyst for visible light mediated organic transformations A Sridhar, R Rangasamy, M Selvaraj New Journal of Chemistry 43 (46), 17974-17979 , 2019 2019 Citations: 49
Efficient amphiphilic poly (propyleneimine) dendrimer stabilized gold nanoparticle catalysts for aqueous phase reduction of nitrobenzene E Murugan, R Rangasamy, I Pakrudheen Science of Advanced Materials 4 (11), 1103-1110 , 2012 2012 Citations: 43
Development of stable pollution free TiO2/Au nanoparticle immobilized green photo catalyst for degradation of methyl orange E Murugan, R Rangasamy Journal of biomedical nanotechnology 7 (1), 225-228 , 2011 2011 Citations: 43
Synthesis and Characterization of Fe 3 O 4 /Carbon Dot Supported MnO 2 Nanoparticles for the Controlled Oxidation of Benzyl Alcohols E Prathibha, R Rangasamy, A Sridhar, K Lakshmi ChemistrySelect 5 (3), 988-993 , 2020 2020 Citations: 38
Synthetic modification of silica coated magnetite cored PAMAM dendrimer to enrich branched Amine groups and peripheral carboxyl groups for environmental remediation K Lakshmi, R Rangasamy Journal of Molecular Structure 1224, 129081 , 2021 2021 Citations: 26
Synthesis of ultrafine AuPd bimetallic nanoparticles using a magnetite-cored poly (propyleneimine) dendrimer template and its sustainable catalysis of the Suzuki coupling reaction R Rangasamy, K Lakshmi, M Selvaraj New Journal of Chemistry 45 (31), 14227-14235 , 2021 2021 Citations: 19
Synthesis of structurally enhanced magnetite cored poly (propyleneimine) dendrimer nanohybrid material and evaluation of its functionality in sustainable catalysis of … L Kannappan, R Rajmohan Reactive and Functional Polymers 152, 104579 , 2020 2020 Citations: 18
Synthesis of Au nanoparticles using magnetite cored polyamine dendrimer template and its green catalysis for selective oxidation of alcohols L Kannappan, R Rajmohan, P Edwin Materials Letters 301, 130257 , 2021 2021 Citations: 9
Immobilization of Pt nanoparticles on magnetite–poly (epoxyamine) nanocomposite for the reduction of p -nitrophenol K Lakshmi, R Rangasamy, E Prathibha, A Sridhar SN Applied Sciences 1 (9), 1121 , 2019 2019 Citations: 5
Ultrasound‐assisted synthesis of silica‐coated magnetite material decorated with silver nanoparticles for the detoxification of 4‐nitrophenol E Prathibha, R Rangasamy, A Sridhar, K Lakshmi Applied Organometallic Chemistry 37 (3), e6991 , 2023 2023 Citations: 4
Simple one pot green synthesis of silver-palladium bimetallic nanoparticles: A fluorescent turn-off sensor for detection of lead ions in environmental water and its … A Selvaraj, K Mukundamurthy, R Rajmohan, P Tamizhdurai South African Journal of Chemical Engineering 52 (1), 243-257 , 2025 2025 Citations: 3
Omnipotent plant sources assisted green synthesis of Silver Nanoparticle-A promising Chemical Sensing tool A Selvaraj, KM Murthy, R Rajmohan Journal of the Turkish Chemical Society Section A: Chemistry 11 (2), 899-918 , 2024 2024 Citations: 3
Rose Bengal anchored silica-magnetite nanocomposite as photosensitizer for visible-light-mediated oxidation of thioethers E Prathibha, R Rangasamy, A Sridhar, K Lakshmi Journal of Cluster Science 34 (3), 1605-1614 , 2023 2023 Citations: 3
Nanocatalysts and Redox Nanoparticles for Water Purification K Lakshmi, A Sridhar, R Rangasamy Nanomaterials for Air‐and Water Purification, 145-163 , 2024 2024 Citations: 1
DUAL-FUNCTIONAL BAEL GUM STABILIZED SILVER NANOPARTICLES-A SUSTAINABLE PAPER-BASED SENSOR FOR DETECTION OF Hg 2+ IONS AND PHOTO-CATALYST FOR DYE DEGRADATION. A Selvaraj, K Mukundamurthy, R Rajmohan Rasayan Journal of Chemistry 18 (2) , 2025 2025
Sustainable catalysis of nanocrystals: A green technology R Rangasamy, K Lakshmi, K Muthu Industrial Applications of Nanocrystals, 275-311 , 2022 2022
DENDRITIC UNIMOLECULAR MICELLE STABILIZED Au/Pd BIMETALLIC NANOPARTICLES: SYNTHESIS AND AQUEOUS PHASE CATALYSIS R Rajmohan, E Murugan Catalysis in Green Chemistry and Engineering 1 (2) , 2018 2018
