Chemistry, Biomaterials, Waste Management and Disposal
10
Scopus Publications
233
Scholar Citations
8
Scholar h-index
8
Scholar i10-index
Scopus Publications
Microwave-Assisted Synthesis of Carbon Dots from Justicia adhatoda Leaves: Evaluation of their Antimicrobial and Cytotoxic Activities Varusai Mohamed M, Hema Sindhuja George, Jafar Ahamed A, Hosimin Selvaraj, Priyadharshini Aravind Chemistryselect, 2025 Carbon dots (CDs), as emerging nanomaterials, have garnered significant attention due to their unique optical properties and versatile biomedical applications. In this study, we report a facile and eco‐friendly microwave‐assisted carbonization method to synthesize fluorescent CDs from Justicia adhatoda leaves, a renewable biomass resource. The resulting CDs exhibited strong fluorescence with an emission peak at 381 nm and a quantum yield of approximately 9.8%, along with excellent water dispersibility and biocompatibility. Morphological analysis revealed an average particle size of approximately 2.08 nm. The antimicrobial potential of these CDs was evaluated against multiple bacterial strains, including Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa, demonstrating dose‐dependent broad‐spectrum antibacterial activity at 80 µg/mL. Additionally, the CDs showed significant antifungal effects against Candida albicans and Aspergillus niger at comparable concentrations. Cytotoxicity assessment against HepG2 liver cancer cells revealed an IC50 value of 9.69 µg/mL, indicating promising anticancer efficacy. This work highlights the potential of biomass‐derived CDs as multifunctional nanomaterials for antibacterial, antifungal, and anticancer applications, advancing their prospects in nanomedicine.
Microwave-assisted one-pot synthesis of carbon dots from biomass: Fe(III) ion sensing and in-situ methylene blue reduction catalytic activity Hema Sindhuja George, Hosimin Selvaraj, Andivelu Ilangovan, Bader O. Almutairi, Mohamed Kasim Sheit, Kuppusamy Sathishkumar Desalination and Water Treatment, 2024 In this study, zero-dimensional fluorescent carbon dots were synthesized from affordable organic bio-precursors derived from chayote seeds using a one-pot microwave-assisted carbonization process. These biomass-derived carbon dots display excellent fluorescence properties, with an average size of approximately 3.3 nm and a fluorescence quantum yield about 9.56 %. The fluorescence emission spectra were recorded at different excitation peaks, with the highest intensity emission peak observed at 387 nm with an excitation wavelength of 320 nm. These carbon dots effectively detect Fe3+ ions, with a detection limit of 4.5 µmol. Carbon dots show strong catalytic reduction activity against a reduction of Methylene Blue dye, achieving an 81 % reduction in a short period. These biomass-derived carbon dots presents sustainable and promising option for applications in metal sensing and catalytic degradation.
A new route: Electro oxidation of dithionite industrial effluent and recovery of caustic using electrochemical membrane cell Karthikeyan Chandrasekaran, Hema Sindhuja George, Lakshmi Venkideswaran, Hosimin Selvaraj, Maruthamuthu Sundaram Journal of Water Process Engineering, 2020 Mixture of sodium thiosulfate and sodium formate contaminated effluent is produced by sodium dithionite industry, which was treated by electrochemical oxidation process. Platinised titanium (Ti/Pt) mesh and titanium (Ti) mesh were used as anode and cathode respectively. Nafion 961 cation exchange membrane was used as ion exchanger and acted as separator in the membrane cell. The investigation was done by potentiostatic mode (3.0 V). The cyclic voltammetry (CV) study revealed the oxidation potential of thiosulfate and formate. About 95.44 % of sulfate conversion was achieved and 70 % formate was mineralised by this new route. Dispersed sulfur particles were noticed in anolyte compartment and complete thiosulfate conversation was confirmed using UV–Vis spectroscopy and volumetric estimation. Besides, caustic was recovered by this process.
A hybrid treatment process for product recycling from tannery process effluent and soak liquor Karthikeyan Chandrasekaran, Hosimin Selvaraj, Hema Sindhuja George, Maruthamuthu Sundaram, Thaj Mohammed Khaleel Journal of Environmental Chemical Engineering, 2020 The sulfate rich saline tannery effluent (SRSTE) was treated effectively using halophilic bacterial pretreatment followed by electrochemical oxidation (hybrid treatment). Aerobic degradation was done using halophilic bacterial consortia isolated from the tannery soak effluent, resulted in 76 % COD removal after 6 days. The remaining COD was reduced by electrochemical oxidation (EO). In electro oxidation process (without aerobic pretreatment), 24 h of electro-oxidation was needed to complete COD removal. The process efficiency was analysed through Fourier transform infrared spectroscopy (FTIR), high performance liquid chromatography (HPLC), total organic carbon (TOC) and chemical oxygen demand (COD). The reduction of sulfate could not be noticed in presence of halophilic bacteria in aerobic treatment. The energy consumption for COD removal was about 0.343 and 0.020 kW h/g1 in electrochemical oxidation and hybrid treatment process respectively. Besides, chloride loss was also higher in EO when compared to hybrid approach. Hybrid treatment process was proved to be an effective method for treating SRSTE. The mixed salt was recovered and used for dyeing purpose.
Removal of sulfide and recycling of recovered product from tannery lime wastewater using photoassisted-electrochemical oxidation process Hosimin Selvaraj, Priyadharshini Aravind, Hema Sindhuja George, Maruthamuthu Sundaram Journal of Industrial and Engineering Chemistry, 2020 Investigation and optimization of photoassisted electro-oxidation process for removal of high concentration of sulfide and COD from tannery lime wastewater was done. Electro oxidation process with UV-light were evaluated with different current densities such as 15, 20, 25 mA/cm2 with cylindrical electrodes (MMO and Ti sheet). 100% sulfide, 92% of COD and 70% total organic carbon (TOC) were effectively reduced by the current density of 25 mA/cm2 in the photo-assisted electrochemical oxidation process. In Electro-oxidation process alone, the COD and TOC were not reduced effectively. Water/mixed salt (47% Na2SO4 and 53% NaCl) were recovered and reused for dye fixation process.
RECENT SCHOLAR PUBLICATIONS
Microwave-Assisted Synthesis of Carbon Dots from Justicia adhatoda Leaves: Evaluation of their Antimicrobial and Cytotoxic Activities MV Mohamed, HS George, AJ Ahamed, H Selvaraj, P Aravind CHEMISTRYSELECT 10 (30) , 2025 2025.0 Citations: 4
One-Pot Green Synthesis of Carbon Dots from Swietenia macrophylla for Fluorescent Fe3+ ion Sensing and Catalytic activity AI Hosimin Selvaraj, Kumaresan Kalainilavan, Kaleeswaran Sneka Sri, Hema ... Journal of the Indian Chemical Society 102 (7), 101792 , 2025 2025.0 Citations: 7
Microwave-assisted one-pot synthesis of carbon dots from biomass: Fe (III) ion sensing and in-situ methylene blue reduction catalytic activity HS George, H Selvaraj, A Ilangovan, BO Almutairi, MK Sheit, ... Desalination and Water Treatment 320, 100624 , 2024 2024.0 Citations: 23
Investigation on the corrosion inhibition efficiency of 2, 4-diphenyl-3-aza bicyclo [3.3. 1] nonan-9-one in carbon steel immersed in acidic media HMK Sheit, KS Mohan, KV Gunavathy, MV Mohamed, P Subhapriya, ... Chemical Physics Impact 8, 100521 , 2024 2024.0 Citations: 17
Eco-friendly and sustainable process for recovery of sulfate from paper mill mixed salt: recycling of sulfate for dye fixation process H Selvaraj, HS George, P Aravind, K Chandrasekaran, A Ilangovan, ... Journal of Environmental Management 353, 120201 , 2024 2024.0 Citations: 6
Green synthesis of biomass derived carbon dots via microwave-assisted method for selective detection of Fe3+ ions in an aqueous medium HS George, H Selvaraj, A Ilangovan, K Chandrasekaran, VR Kannan, ... Inorganic Chemistry Communications 157, 111348 , 2023 2023.0 Citations: 58
MICROWAVE ASSISTED ONE POT METHOD FOR SYNTHESIZING FLUORESCENT CARBON DOTS FROM CHAYOTE SEEDS M Hema Sindhuja, Syed Abuthahir, Samsathbegum, Mohamed Kasim Sheit, Mohamed ... IN Patent App. 202341015437 A , 2023 2023.0
A process for recovery of sulphate and caustic from electrostatic precipitator ash PA Maruthamuthu Sundaram Hosimin Selvaraj, Karthikeyan Chandrasekaran, Hema ... IN Patent App. 202,341,007,270 , 2023 2023.0
Effective removal of 2, 4-dichlorophenoxyacetic acid from aqueous solutions using polyaniline recovered from non-recyclable pigment effluent via electro polymerization HS George, P Aravind, H Selvaraj, A Ilangovan, M Sundaram, ... Journal of Water Process Engineering 51, 103407 , 2023 2023.0 Citations: 17
Anoxic treatment for thiosulfate separation from formate containing dithionite industrial effluent and electrochemical sulfur recovery K Chandrasekaran, HS George, H Selvaraj, S Dharmarajan, M Sundaram Journal of Environmental Chemical Engineering 10 (3), 107324 , 2022 2022.0 Citations: 14
A new route: Electro oxidation of dithionite industrial effluent and recovery of caustic using electrochemical membrane cell K Chandrasekaran, HS George, L Venkideswaran, H Selvaraj, ... Journal of Water Process Engineering 36, 101304 , 2020 2020.0 Citations: 10
A hybrid treatment process for product recycling from tannery process effluent and soak liquor K Chandrasekaran, H Selvaraj, HS George, M Sundaram, TM Khaleel Journal of Environmental Chemical Engineering 8 (2), 103516 , 2020 2020.0 Citations: 15
Removal of sulfide and recycling of recovered product from tannery lime wastewater using photoassisted-electrochemical oxidation process H Selvaraj, P Aravind, HS George, M Sundaram Journal of Industrial and Engineering Chemistry 83, 164-172 , 2020 2020.0 Citations: 59
Synthesis, Spectral Characterization and Biological Screening for Some Benzaldehyde Derived Mannich Bases MMR Hema Sindhuja*, Bheeter International Journal of Pharmacy and Biological Sciences 9 (2), 51 - 54 , 2019 2019.0 Citations: 3
Synthesis, spectroscopic investigation and antibacterial testing of few transition metal complexes with Azide ligand DAAA Hema Sindhuja G, Dr. S.R. Bheeter International journal of basic and applied research 8 (Number 10) , 2018 2018.0
Mixed ligand complexes of Cobalt, Manganese and Iron – Synthesis, Characterization and Antimicrobial activity. BSR Hema Sindhuja G European Journal of Biomedical and Pharmaceutical sciences 5 (3), 30-36 , 2018 2018.0
Synthesis, spectral studies and antimicrobial activity of a novel mannich base derived from nicotinamide N-((1H-benzo[d]imidazole-1-yl)(4-nitrophenyl)methyl)nicotinamide HemaSindhuja. G*, Hosimin.S , John Merlin. J, Bheeter. S.R* Journal For Advanced Research in Applied Sciences 8 (10), 2278-0505 , 2018 2018.0
Synthesis, Spectral Characterization and Biological Screening for Some Benzaldehyde Derived Mannich Bases GH Sindhuja, SR Bheeter, MMM Raja
MOST CITED SCHOLAR PUBLICATIONS
Removal of sulfide and recycling of recovered product from tannery lime wastewater using photoassisted-electrochemical oxidation process H Selvaraj, P Aravind, HS George, M Sundaram Journal of Industrial and Engineering Chemistry 83, 164-172 , 2020 2020.0 Citations: 59
Green synthesis of biomass derived carbon dots via microwave-assisted method for selective detection of Fe3+ ions in an aqueous medium HS George, H Selvaraj, A Ilangovan, K Chandrasekaran, VR Kannan, ... Inorganic Chemistry Communications 157, 111348 , 2023 2023.0 Citations: 58
Microwave-assisted one-pot synthesis of carbon dots from biomass: Fe (III) ion sensing and in-situ methylene blue reduction catalytic activity HS George, H Selvaraj, A Ilangovan, BO Almutairi, MK Sheit, ... Desalination and Water Treatment 320, 100624 , 2024 2024.0 Citations: 23
Investigation on the corrosion inhibition efficiency of 2, 4-diphenyl-3-aza bicyclo [3.3. 1] nonan-9-one in carbon steel immersed in acidic media HMK Sheit, KS Mohan, KV Gunavathy, MV Mohamed, P Subhapriya, ... Chemical Physics Impact 8, 100521 , 2024 2024.0 Citations: 17
Effective removal of 2, 4-dichlorophenoxyacetic acid from aqueous solutions using polyaniline recovered from non-recyclable pigment effluent via electro polymerization HS George, P Aravind, H Selvaraj, A Ilangovan, M Sundaram, ... Journal of Water Process Engineering 51, 103407 , 2023 2023.0 Citations: 17
A hybrid treatment process for product recycling from tannery process effluent and soak liquor K Chandrasekaran, H Selvaraj, HS George, M Sundaram, TM Khaleel Journal of Environmental Chemical Engineering 8 (2), 103516 , 2020 2020.0 Citations: 15
Anoxic treatment for thiosulfate separation from formate containing dithionite industrial effluent and electrochemical sulfur recovery K Chandrasekaran, HS George, H Selvaraj, S Dharmarajan, M Sundaram Journal of Environmental Chemical Engineering 10 (3), 107324 , 2022 2022.0 Citations: 14
A new route: Electro oxidation of dithionite industrial effluent and recovery of caustic using electrochemical membrane cell K Chandrasekaran, HS George, L Venkideswaran, H Selvaraj, ... Journal of Water Process Engineering 36, 101304 , 2020 2020.0 Citations: 10
One-Pot Green Synthesis of Carbon Dots from Swietenia macrophylla for Fluorescent Fe3+ ion Sensing and Catalytic activity AI Hosimin Selvaraj, Kumaresan Kalainilavan, Kaleeswaran Sneka Sri, Hema ... Journal of the Indian Chemical Society 102 (7), 101792 , 2025 2025.0 Citations: 7
Eco-friendly and sustainable process for recovery of sulfate from paper mill mixed salt: recycling of sulfate for dye fixation process H Selvaraj, HS George, P Aravind, K Chandrasekaran, A Ilangovan, ... Journal of Environmental Management 353, 120201 , 2024 2024.0 Citations: 6
Microwave-Assisted Synthesis of Carbon Dots from Justicia adhatoda Leaves: Evaluation of their Antimicrobial and Cytotoxic Activities MV Mohamed, HS George, AJ Ahamed, H Selvaraj, P Aravind CHEMISTRYSELECT 10 (30) , 2025 2025.0 Citations: 4
Synthesis, Spectral Characterization and Biological Screening for Some Benzaldehyde Derived Mannich Bases MMR Hema Sindhuja*, Bheeter International Journal of Pharmacy and Biological Sciences 9 (2), 51 - 54 , 2019 2019.0 Citations: 3
MICROWAVE ASSISTED ONE POT METHOD FOR SYNTHESIZING FLUORESCENT CARBON DOTS FROM CHAYOTE SEEDS M Hema Sindhuja, Syed Abuthahir, Samsathbegum, Mohamed Kasim Sheit, Mohamed ... IN Patent App. 202341015437 A , 2023 2023.0
A process for recovery of sulphate and caustic from electrostatic precipitator ash PA Maruthamuthu Sundaram Hosimin Selvaraj, Karthikeyan Chandrasekaran, Hema ... IN Patent App. 202,341,007,270 , 2023 2023.0
Synthesis, spectroscopic investigation and antibacterial testing of few transition metal complexes with Azide ligand DAAA Hema Sindhuja G, Dr. S.R. Bheeter International journal of basic and applied research 8 (Number 10) , 2018 2018.0
Mixed ligand complexes of Cobalt, Manganese and Iron – Synthesis, Characterization and Antimicrobial activity. BSR Hema Sindhuja G European Journal of Biomedical and Pharmaceutical sciences 5 (3), 30-36 , 2018 2018.0
Synthesis, spectral studies and antimicrobial activity of a novel mannich base derived from nicotinamide N-((1H-benzo[d]imidazole-1-yl)(4-nitrophenyl)methyl)nicotinamide HemaSindhuja. G*, Hosimin.S , John Merlin. J, Bheeter. S.R* Journal For Advanced Research in Applied Sciences 8 (10), 2278-0505 , 2018 2018.0
Synthesis, Spectral Characterization and Biological Screening for Some Benzaldehyde Derived Mannich Bases GH Sindhuja, SR Bheeter, MMM Raja
