Water and wastewater treatment, Mass transfer, Bioremediation, Material Science
18
Scopus Publications
153
Scholar Citations
8
Scholar h-index
5
Scholar i10-index
Scopus Publications
Structural insights into nano-porous zinc oxide carbon composites for sustainable hexavalent chromium removal Mahesh Ramakrishna, R. Shivakumar, Suman Pawar, Poornima Hiremath, Hemanth Lakshmipura Ramachandraiah, Chetan A. Nayak Indian Chemical Engineer, 2026 A novel method for synthesising nano-porous zinc oxide-carbon composites was developed using zinc nitrate, glycine and carbon nanofibres in a controlled setting. Despite the challenges posed by the exothermic solution combustion method, the approach effectively produced porous composites that maintained structural carbon, as verified by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Heat treatment between 350 and 650 °C resulted in the formation of hexagonal wurtzite zinc oxide, with crystal sizes shrinking from 15 nm to 11 nm as the temperature rose. Changes in morphology were noted, and energy dispersive spectroscopy (EDS) analysis confirmed the presence of zinc, oxygen, and carbon. The composites showed impressive efficiency in removing hexavalent chromium from water solutions, achieving a 91.27% removal rate under optimal conditions (200 ppm concentration, pH 7, 0.5 g adsorbent and 30 min of contact). The adsorption parameters were optimised using response surface methodology, with the findings indicating that chemisorption was the primary removal mechanism. This innovative synthesis method underscores the potential of solution combustion-synthesised composites for effective environmental remediation applications.
Application of response surface methodology for defluoridation of water using zirconia-activated carbon nanocomposite Poornima G. Hiremath, Harish Phattepur, Omkar S. Baradol, K. V. Shreyas Indian Chemical Engineer, 2023 Fluoride overexposure, especially through drinking water, poses a severe risk to people all over the world. There are several ways to get rid of fluoride, but adsorption technologies are typically seen to be the most appealing in view of their efficiency, practicality, simplicity of operation, and attractiveness from an economic and environmental standpoint. In the current work, Zirconia and activated carbon nanocomposite (Zr-AC) were researched for the adsorption of fluoride from water. The impact of the various factors, viz. Zr-AC dosage (0.25–2.5 g/L), initial concentration of fluoride (2–32 ppm), pH (2.0–7.0) and contact time (30–180 min) and their effect on adsorption of fluoride was examined by using central composite design (CCD) of response surface methodology (RSM). At pH 7, initial fluoride concentration of 2 ppm, contact time of 180 min, and Zr-AC dosage of 2.5 g/L, fluoride removal was around 95% using Zr-AC composite. Surface characterisation of the prepared adsorbent was done using SEM-EDS and FTIR. The obtained results indicate that Zr-AC gave good results and therefore could be used for treating fluoride-contaminated water.
Optimisation of Defluoridation of Water by Zirconia Nanoparticles Using RSM Poornima G. Hiremath, G.K. Prashanth, Abdul Bais Kadli, Sheril Varghese, Vishnu V. Bhaskar Asian Journal of Water Environment and Pollution, 2022 In the present work, zirconia nanoparticles were investigated for the adsorption of fluoride from water. The effect of the factor variables viz., the effect of initial fluoride concentration, adsorbent dosage, pH, and contact time and their interactions on adsorption of fluoride ion were investigated by response surface methodology (RSM) based on central composite design (CCD). The maximum fluoride removal was around 95% at 7 pH, initial fluoride concentration of 10 ppm, adsorbent dosage of 12.5 g/L, and contact time at 105 min. To understand the adsorption mechanism of fluoride on to the nanoparticles, adsorption isotherms and adsorption kinetics were studied. The Langmuir isotherm adsorption model and pseudo-second-order kinetics model fitted well for the fluoride removal using zirconia nanoparticles. The nanoparticles were characterised before and after for their adsorption using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and SEM analysis.
FACILE CELLULOSE ACETATE MEMBRANE FABRICATION USING MESOPOROUS TIO2 NANOPARTICLES: SYNTHESIS, CHARACTERISATION AND ITS PHOTOCATALYTIC APPLICATION Journal of Chemical Technology and Metallurgy, 2022
Sustainable Sunflower Extract Derived NiV2O6 Nanoparticles For Environmental Remediation And Forensic Application GN S Varun, Venkatesh Gowda G R, Gagana G R, D M Gurudatt, T. K Chaitra ... Journal of Cluster Science, https://doi.org/10.1007/s10876-026-03031 37 (78) , 2026 2026
Optimized Fluoride Adsorption from Water Using Functionalized Rice Straw: A Response Surface Methodology Approach R H S, H., S Tantri, P., G Hiremath, P., P Arun, A., Mudhulu, S., H Patil, J ... International Journal of Sustainable Engineering 19 (1), https://doi.org/10 … , 2026 2026 Citations: 1
Structural insights into nano-porous zinc oxide carbon composites for sustainable hexavalent chromium removal HLRCAN Mahesh Ramakrishna, R. Shivakumar,Suman Pawar,Poornima Hiremath Indian Chemical Engineer, 1-19 , 2026 2026
Treatment of fluoride-contaminated water in a prototype adsorption unit using zirconium-activated carbon nanocomposites PG Hiremath, S Rajashekhara, S Sarkar, HS Kumar, V Thejashree Indian Chemical Engineer 67 (5), 687-700 , 2025 2025 Citations: 1
Enhanced fluoride removal by modified water hyacinth: response surface methodology and machine learning approach JH Patil, R Kusanur, PG Hiremath, AH Gadagi, PG Hegde, ... Biomass Conversion and Biorefinery 15 (13), 20119-20134 , 2025 2025 Citations: 6
Sustainable Defluoridation of Water: Fixed-Bed Adsorption Column Studies Using Zirconium Doped Sunflower Seed Husk as an Adsorbent PGK Bhavya N.S., H.V. Jayaprakash, H.S. Lalithamba, Poornima G. Hiremath ... South Eastern European Journal of Public Health 26, 6114–6132 , 2025 2025
Immobilized chitosan as an efficient adsorbent for columnar adsorption of Cr (VI) from aqueous solution MK Shetty, JH Patil, SM Shekhar, PG Hiremath, MR Rajani, SM Desai, ... International Journal of Biological Macromolecules 282, 137445 , 2024 2024 Citations: 8
Fluoride removal using tartaric acid-modified rice husk biochar: Comprehensive batch and column studies PG Hiremath, M Chennabasappa Sustainable Chemistry One World 2, 100005 , 2024 2024 Citations: 7
Application of response surface methodology for defluoridation of water using zirconia-activated carbon nanocomposite PG Hiremath, H Phattepur, OS Baradol, KV Shreyas Indian Chemical Engineer 65 (5), 476-485 , 2023 2023 Citations: 3
Comparative Study of Defluoridation of Water Using Green Synthesized Zirconia Nanoparticles and Zirconia – Graphene Oxide Nanocomposite PG Hiremath, N Ganganagappa, Udayabhanu, SS Suresh, S Sajjan, ... Journal of The Institution of Engineers (India): Series E 104 (1), 29-35 , 2023 2023 Citations: 1
Sorption studies of Cr (VI) ions from synthetic waste water using chitosan embedded in calcium alginate beads MK Shetty, KV Karthik, JH Patil, SM Shekhar, SM Desai, PG Hiremath, ... Materials Today: Proceedings 76, 1-7 , 2023 2023 Citations: 9
Optimisation of Defluoridation of Water by Zirconia Nanoparticles Using RSM VVB Poornima G. Hiremath, Prashanth G.K., Abdul Bais Kadli, Sheril Varghese Asian Journal of Water, Environment and Pollution 19 (6), 75-84 , 2022 2022 Citations: 1
Potential of Pyrolysis Biochar as an Eco-Friendly Biosorbent for Dye Removal from Industrial Wastewaters P Binnal, S Rajashekhara, PG Hiremath Textile Wastewater Treatment: Sustainable Bio-nano Materials and … , 2022 2022
Facile Cellulose Acetate Membrane Fabrication Using Mesoporous TiO2 Nanoparticles: Synthesis, Characterisation And Its Photocatalytic Application H Phattepur, BS Gowrishankar, SM Shekhar, PG Hiremath, ... Journal of Chemical Technology and Metallurgy 57 (5), 953-961 , 2022 2022
Fabrication of Al2O3 supported TiO2 membranes for photocatalytic applications H Phattepur, PG Hiremath Materials Today: Proceedings 65, 3694-3699 , 2022 2022 Citations: 7
Chapter 9—fluoride contamination in underground water and its treatment PG Hiremath, S Rajashekhara, P Binnal, T Theodore Management of Contaminants of Emerging Concern (CEC) in Environment, 249-280 , 2021 2021 Citations: 11
Fluoride contamination in groundwater and its treatment TT Poornima G Hiremath, Rajashekhara S, Prakash Binnal In Pardeep Singh, Chaudhery Mustansar Hussain, Sanchayita Rajkhowa … , 2021 2021
Defluoridation by Biosorption Technique for Safe Drinking Water TT Poornima G. Hiremath LAP Lambert Academic Publishing , 2020 2020
Synthesis of hydroxyapatite from avocado fruit peel and its application for hexavalent chromium removal from aqueous solutions-adsorption isotherms and kinetics study S Pawar, T Theodore, PG Hiremath Rasayan J. Chem. 100, 2 , 2019 2019 Citations: 9
Modelling of fluoride biosorption by calcium-doped algae using response surface methodology PG Hiremath, T Theodore Indian Chemical Engineer 60 (1), 37-57 , 2018 2018 Citations: 4
MOST CITED SCHOLAR PUBLICATIONS
Modelling of fluoride sorption from aqueous solution using green algae impregnated with zirconium by response surface methodology PG Hiremath, T Theodore Adsorption Science & Technology 35 (1-2), 194-217 , 2017 2017 Citations: 23
Biosorption of fluoride from synthetic and ground water using Chlorella vulgaris immobilized in calcium alginate beads in an upflow packed bed column PG Hiremath, T Theodore Periodica Polytechnica Chemical Engineering 61 (3), 188-199 , 2017 2017 Citations: 21
Application of liquid emulsion membrane technique for the removal of As (V) from aqueous solutions P Binnal, PG Hiremath Journal of The Institution of Engineers (India): Series E 93 (1), 1-8 , 2012 2012 Citations: 20
Zirconium‐doped fungal sorbents: preparation, characterization, adsorption isotherm, and kinetic and mathematical modelling study for removal of fluoride PG Hiremath, T Theodore Advances in Chemistry 2016 (1), 6848693 , 2016 2016 Citations: 12
Chapter 9—fluoride contamination in underground water and its treatment PG Hiremath, S Rajashekhara, P Binnal, T Theodore Management of Contaminants of Emerging Concern (CEC) in Environment, 249-280 , 2021 2021 Citations: 11
Sorption studies of Cr (VI) ions from synthetic waste water using chitosan embedded in calcium alginate beads MK Shetty, KV Karthik, JH Patil, SM Shekhar, SM Desai, PG Hiremath, ... Materials Today: Proceedings 76, 1-7 , 2023 2023 Citations: 9
Synthesis of hydroxyapatite from avocado fruit peel and its application for hexavalent chromium removal from aqueous solutions-adsorption isotherms and kinetics study S Pawar, T Theodore, PG Hiremath Rasayan J. Chem. 100, 2 , 2019 2019 Citations: 9
Immobilized chitosan as an efficient adsorbent for columnar adsorption of Cr (VI) from aqueous solution MK Shetty, JH Patil, SM Shekhar, PG Hiremath, MR Rajani, SM Desai, ... International Journal of Biological Macromolecules 282, 137445 , 2024 2024 Citations: 8
Fluoride removal using tartaric acid-modified rice husk biochar: Comprehensive batch and column studies PG Hiremath, M Chennabasappa Sustainable Chemistry One World 2, 100005 , 2024 2024 Citations: 7
Fabrication of Al2O3 supported TiO2 membranes for photocatalytic applications H Phattepur, PG Hiremath Materials Today: Proceedings 65, 3694-3699 , 2022 2022 Citations: 7
Enhanced fluoride removal by modified water hyacinth: response surface methodology and machine learning approach JH Patil, R Kusanur, PG Hiremath, AH Gadagi, PG Hegde, ... Biomass Conversion and Biorefinery 15 (13), 20119-20134 , 2025 2025 Citations: 6
First Report on Biosorption of Fluoride on the Microalga Spirulina Platensis: Batch Studies P Hiremath, P Binnal Asian-American Journal of Chemistry 1 (1), 1-10 , 2013 2013 Citations: 5
Modelling of fluoride biosorption by calcium-doped algae using response surface methodology PG Hiremath, T Theodore Indian Chemical Engineer 60 (1), 37-57 , 2018 2018 Citations: 4
Isolation, screening, and identification of fungal organisms for biosorption of fluoride: Kinetic study and statistical optimization of biosorption parameters PG Hiremath, PN Navya, V Chandramohan, T Theodore Journal of Biochemical Technology 7 (3-2016), 1069-1077 , 2016 2016 Citations: 4
Application of response surface methodology for defluoridation of water using zirconia-activated carbon nanocomposite PG Hiremath, H Phattepur, OS Baradol, KV Shreyas Indian Chemical Engineer 65 (5), 476-485 , 2023 2023 Citations: 3
Optimized Fluoride Adsorption from Water Using Functionalized Rice Straw: A Response Surface Methodology Approach R H S, H., S Tantri, P., G Hiremath, P., P Arun, A., Mudhulu, S., H Patil, J ... International Journal of Sustainable Engineering 19 (1), https://doi.org/10 … , 2026 2026 Citations: 1
Treatment of fluoride-contaminated water in a prototype adsorption unit using zirconium-activated carbon nanocomposites PG Hiremath, S Rajashekhara, S Sarkar, HS Kumar, V Thejashree Indian Chemical Engineer 67 (5), 687-700 , 2025 2025 Citations: 1
Comparative Study of Defluoridation of Water Using Green Synthesized Zirconia Nanoparticles and Zirconia – Graphene Oxide Nanocomposite PG Hiremath, N Ganganagappa, Udayabhanu, SS Suresh, S Sajjan, ... Journal of The Institution of Engineers (India): Series E 104 (1), 29-35 , 2023 2023 Citations: 1
Optimisation of Defluoridation of Water by Zirconia Nanoparticles Using RSM VVB Poornima G. Hiremath, Prashanth G.K., Abdul Bais Kadli, Sheril Varghese Asian Journal of Water, Environment and Pollution 19 (6), 75-84 , 2022 2022 Citations: 1
Sustainable Sunflower Extract Derived NiV2O6 Nanoparticles For Environmental Remediation And Forensic Application GN S Varun, Venkatesh Gowda G R, Gagana G R, D M Gurudatt, T. K Chaitra ... Journal of Cluster Science, https://doi.org/10.1007/s10876-026-03031 37 (78) , 2026 2026