RANJEET KUMAR MISHRA

@msrit.edu/department

Professor, Chemical Engineering
Ramaiah Institute of Technology Bangalore



              

https://researchid.co/kumar.ranjeet322

RESEARCH INTERESTS

Biomass and Bio-Energy, Biofuel, Biodiesel, Biochar/Bio-carbon, Activated carbon, Carbon sequestration, Waste Management, Catalyst, Combustion, Hydrothermal Liquefaction, Pyrolysis, and Pyrolysis of hydrocarbon-rich feedstock, Modelling and Optimization in pyrolysis and gasification, Plunging Jets,

97

Scopus Publications

Scopus Publications

  • A machine learning-assisted prediction of potential biochar yield subjected to the physicochemical properties of biomass
    Tanushka Florence Panicker, Deepraj Sarkar, Rajashree Krishna, Ranjeet Kumar Mishra, Srinivas Kini Manjeshwar, and Abhishek Sharma
    Elsevier BV

  • Production and characterisation of char derived from pyrolysis of waste residue for removal of nitrates from wastewater
    Yashasvi Trivedi, Abhishek Sharma, Manisha Sharma, Ranjeet Kumar Mishra, Jyeshtharaj B Joshi, Akhilendra Bhushan Gupta, Achintya Bezbaruah, and Kalpit Shah
    IOP Publishing
    Abstract This study presents an innovative valorisation pathway for two challenging waste streams, Refuse-Derived Fuel (RDF) and biosolids, by converting them into highly efficient adsorbents for nitrate removal from wastewater. Chars produced via pyrolysis at 500 °C and 700 °C were structurally modified using ZnCl 2 at varying impregnation ratios (1:1, 2:1, 3:1), significantly enhancing their adsorption uptake capacity and functional groups, as confirmed by surface area determination by Brunauer-Emmett-Teller (BET, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). analysis. The batch adsorption experiments were conducted under varying conditions of pH, temperature, initial nitrate concentration, and adsorbent dosage. Among the samples, RDF-derived char (RDF500-2) demonstrated a maximum adsorption capacity of 160 mg g −1 at optimal conditions (pH 7, 35 °C, adsorbent dose 5 g l −1 ), outperforming various conventional low-cost adsorbents. Adsorption followed pseudo-second-order kinetics and was best described by the Sips isotherm model (R 2  = 0.99), indicating a mixed monolayer-multilayer chemisorption mechanism. Thermodynamic parameters confirmed the process as spontaneous and exothermic. Importantly, the modified RDF and biosolid chars were enriched with additional −COOH and −C=O groups, which were responsible for nitrate binding, demonstrating tailored surface chemistry for environmental applications. The present study introduces sustainable, circular-economy-based adsorbents derived from problematic urban and industrial wastes and offers a low-cost solution for decentralised nitrate removal. These results contribute to a new direction in waste-to-resource innovation, aligning with environmental remediation and waste minimisation policies.

  • Treatment of Landfill Leachate Using an Advanced Microwave Reactor Coupled with a Batch and Continuous Algal Photobioreactor
    Binay Kumar Tripathy, Ranjeet Kumar Mishra, and Mathava Kumar
    American Chemical Society (ACS)




  • Co-pyrolysis behaviour and kinetic analysis of waste mango seeds and low-density polyethylene for their bioenergy potential
    Soham Basu, Sampath Chinnam, Ranjeet Kumar Mishra, and M. Srinivas Kini
    Elsevier BV

  • Recent advances in lignin-based carbon materials for pollutant removal and oil–water separation: a review
    Sonal Vithoba Tarkar, Anuradha K, Ranjeet Kumar Mishra, and Mubarak Marutholi
    Royal Society of Chemistry (RSC)
    The rapid escalation of water pollution from industrial effluents, oil spills, and emerging contaminants has created an urgent need for sustainable, high-performance remediation materials.

  • Green-engineered agricultural-based nano-adsorbent for efficient Cr(vi) removal: batch mechanisms and continuous column performance
    Archana Kushwaha, Zeenat Arif, Bineeta Singh, and Ranjeet Kumar Mishra
    Royal Society of Chemistry (RSC)
    This study presents a green, cost-effective, and sustainable strategy for remediation of Cr( vi ) from surface water.

  • Thermochemical upcycling of paper-mill waste into hydrocarbon-rich fuels and functional char for rubber reinforcement
    Mukesh Bhatt, Madhu Ganesh, Ranjeet Kumar Mishra, Abhishek Sharma, and Jyeshtharaj B. Joshi
    Royal Society of Chemistry (RSC)
    This study investigates the thermochemical upcycling of paper-mill waste composed of mixed paper and residual plastics into high-value fuels and functional char for composite applications.

  • Integrated pyrolysis of pine needles and cashewnut shells: optimizing process conditions for the production of renewable fuel and value-added chemicals
    Sowkhya Naidu, Sivasankar Kakku, Ranjeet Kumar Mishra, Prathap Somu, Jyeshtharaj Joshi, Chiranjeevi Thota, Sathrugnan Karthikeyan, and Abhishek Sharma
    Royal Society of Chemistry (RSC)
    The sustainable conversion of lignocellulosic residues into renewable fuels and chemicals is vital to advancing a circular bioeconomy.

  • Thermo-catalytic pyrolysis and kinetic study of non-edible castor seeds into renewable liquid fuel and value-added chemicals
    Tanushka Florence Panicker, Richa Gupta, Ranjeet Kumar Mishra, and Kaustubha Mohanty
    Elsevier BV


  • Recent progress in post-modified biochar-based material for supercapacitor applications: a review
    Ranjeet Kumar Mishra, D. Jaya Prasanna Kumar, Sampath Chinnam, Ravi Sankannavar, Abhishek Sharma, and Kaustubha Mohanty
    Springer Science and Business Media LLC
    Abstract The escalating demand for efficient and sustainable energy storage solutions has spotlighted post-modified biochar materials as promising candidates for supercapacitor electrodes due to their high power density, rapid charge/discharge rates, and long-term stability. This review provides a comprehensive analysis of recent advancements in the synthesis, activation, and functionalization of biochar for supercapacitor applications. Various biomass sources, including agricultural and industrial wastes, have been pyrolysed or hydrothermally carbonised and further activated using agents such as KOH, NaOH, ZnCl₂, and H₃PO₄, achieving specific surface areas (SSA) as high as 3577 m²/g and pore volumes up to 2.3 cm³/g. The electrochemical performance is significantly enhanced through heteroatom doping (N, O, S, P) and metal oxide composite formation, leading to specific capacitances ranging from 252 F/g to 550 F/g and energy densities up to 45.69 Wh/kg. Further, surface modification improves wettability and electron transport while mesopore/hierarchical structures facilitate ion diffusion. The nitrogen-doped biochar demonstrated a specific capacitance of 420 F g − 1 at 1 A g − 1 .m, whereas KOH-activated walnut shell-derived biochar exhibited 3577 m²/g SSA and 81% capacitance retention over 5000 cycles. Also, surface oxidation techniques have improved wettability and charge transfer, leading to excellent long-term cycling stability, with capacitance retention above 95% after 10,000 cycles. Owing to increased attention towards eco-friendly, viable, and scalable energy solutions, this article presents a thorough overview of the advanced techniques to treat biochar as supercapacitors. Challenges such as scalability, performance, and cost-effectiveness are presented, and a discussion of the future outlook for integrating biochar for sustainable energy storage is provided. Graphical abstract

  • Production and characterization of magnetic Biochar derived from pyrolysis of waste areca nut husk for removal of methylene blue dye from wastewater
    Syeda Minnat Chistie, Sneha Ullhas Naik, Pragathi Rajendra, Apeksha, Ranjeet Kumar Mishra, Gadah Albasher, Sampath Chinnam, Gautham P. Jeppu, Zeenat Arif, and Javaria Hameed
    Springer Science and Business Media LLC
    Abstract The textile industry causes lots of pollution due to its discharge of untreated coloured effluents into water bodies, impacting the environment. The present study includes a slow pyrolysis technique to produce magnetic biochar derived from waste areca nut husk (ANH)) biomass to adsorb methylene blue dye. The biochar and biomass were characterised via proximate analysis, ultimate analysis, bulk density, heating value, extractive content, biochemical analysis, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), SEM, BET surface area, pH, water holding capacity (WHC) and X-ray diffraction (XRD). A semi-batch reactor was used to produce biochar (ANHB) at 600 and 800 oC at 10 oC min− 1 heating rate and 45 min holding time in an inert atmosphere. The produced biochar was magnetised by blending aqueous biochar suspensions with aqueous Fe3+/Fe2+ solutions. Further, magnetised biochar is employed to eliminate methylene blue (MB) dyes at different pHs, contact times, temperatures, dosages and concentrations. Biochar derived at 800 oC (ANHB800) gave increased carbon content (62.93%), heating value (33.02 MJ/kg), and BET surface area (112 m2/g) over biochar derived at 600 oC. The results of the acid treatment biochar (ANHBA800) demonstrated that 5M H2SO4 causes a BET surface area increase (265 m2/g) and a ash content decrease (9.96%). However, when magnetic biochar was produced at 800 oC it shows an additional increase in BET surface area upto 385 m2/g. The MB dye absorption analysis confirmed 85.47% adsorption at 0.3 g/l dosage, 100 ppm concentration, 30 oC, 60 min contact time, and pH 7. The adsorption capacity was 785.34 mg/g when fit by the Langmuir isotherm model. Magnetic nanoparticles enhance active sites, electrostatic interactions, and recovery, improving efficiency, cost-effectiveness, and sustainability in dye removal. The adsorption kinetics results suggested that the pseudo-second-order model best explains the experimental data with an R2 value of 0.994. Additionally, the adsorption isotherm studies were best fitted by the Langmuir model adsorption conforming monolayer adsorption of MB on biochar surface.

  • Catalytic co-pyrolysis of waste coconut fibers and polystyrene using Py-GC-MS: Effect of temperatures and catalyst loading on pyrolytic hot vapours
    Tanushka Florence Panicker, Anuradha K, Sonal Vithoba Tarkar, Ranjeet Kumar Mishra, Xianhua Wang, and Kaustubha Mohanty
    Elsevier BV

  • Pyrolysis of waste pinewood sawdust using Py-GC-MS: effect of temperature and catalysts on the pyrolytic product composition
    Ranjeet Kumar Mishra, Sampath Chinnam, Naveen Dwivedi, and Bishnu Acharya
    Royal Society of Chemistry (RSC)
    Pyrolysis of waste pinewood sawdust (PWS) was investigated using Py-GC-MS to gauge its suitability for generating fuel and chemicals.

  • A review on waste biomass-derived biochar: Production, characterisation, and advanced analytical techniques for pollutants assessment in water and wastewater
    Talapala Urvasi Vandana, Binay Kumar Tripathy, Ranjeet Kumar Mishra, Abhishek Sharma, and Kaustubha Mohanty
    Elsevier BV

  • Two-dimensional molybdenum oxides and sulfides for energy systems: Toward efficient and eco-friendly solutions
    B.S. Srujana, A. Pramitha, Ranjeet Kumar Mishra, Mahesh P. Suryawanshi, and Y. Raviprakash
    Elsevier BV

  • Mechanistic assessment of functionalised biochar derived from customised pyrolyzer for nitrate removal
    Yashasvi Trivedi, Abhishek Sharma, Manisha Sharma, Ranjeet Kumar Mishra, Jyeshtharaj Bhalchandra Joshi, Akhilendra Bhushan Gupta, Bezbaruah Achintya, Kalpit Shah, and K.K. Pant
    Elsevier BV

  • Biochar potential for pollutant removal during wastewater treatment: A comprehensive review of separation mechanisms, technological integration, and process analysis
    Yashasvi Trivedi, Manisha Sharma, Ranjeet Kumar Mishra, Abhishek Sharma, Jyeshtharaj Joshi, Akhilendra Bhushan Gupta, Bezbaruah Achintya, Kalpit Shah, and Arun Krishna Vuppaladadiyamd
    Elsevier BV

  • Sustainable valorization of bamboo sawdust via catalytic pyrolysis into renewable liquid fuel and value-added chemicals
    Raunak Gupta, Ranjeet Kumar Mishra, D Jaya Prasanna Kumar, Sampath Chinnam, Abhishek Sharma, and Kaustubha Mohanty
    IOP Publishing
    Abstract Bamboo biomass is a promising resource for the manufacture of sustainable chemicals and energy due to its quick growth and widespread availability. This study delves into the thermal and catalytic pyrolysis of bamboo sawdust (BBS) using a semi-batch reactor operating at 600 °C, with a heating rate of 30 °C min−1 and a nitrogen flow rate of 100 ml min−1. Various proportions of biomass and catalyst were blended to explore the optimal yield and enhanced characteristics of the pyrolysis oil. Characterisation of BBS and pyrolysis oil involved proximate and elemental analyses, heating value, density, FTIR, XRD, FESEM, BET surface area, GC-MS, viscosity, and moisture content assessments. Results revealed that thermal pyrolysis of BBS yielded 33.35 wt%, while the addition of 5 wt% ZSM-5 catalyst increased the liquid yield to 35.25 wt%. The thermal pyrolysis oil exhibited higher viscosity (63.11 cSt), lower pH (2.02), and increased oxygen content (24.23 wt%), whereas the utilisation of catalysts reduced viscosity (53.95 cSt), increased pH (3.27) and decreased the oxygen content (12.19 wt%). FTIR analysis confirmed the presence of O-H, C-C and C=C functional groups in pyrolysis oils. GC-MS analysis demonstrated that the introduction of catalysts enhanced hydrocarbons, furan-based products, and alcohols while reducing acids, phenols, and nitrogen-containing compounds. Further, characterisation of the biochar revealed 67.63wt%, 31.31 MJ kg−1, 26.86 m2 g−1, 9.32, and 18.19% carbon content, HHV, BET surface area, pH, and water holding capacity (WHC). In summary, the study concludes that the pyrolysis of BBS with catalysts improves the properties and yield of the resulting oil, indicating promising opportunities for the utilisation of bamboo biomass in renewable energy and chemical production.

  • Bioelectricity generation: Powering the future with microbial fuel cells
    Akansha Mohanty, Siddhika Ajmera, Yash Misra, Ranjeet Kumar Mishra, D. Jaya Prasanna Kumar, and Ravi Sankannavar
    CRC Press

  • Pyrolysis Behavior, Kinetic Analysis, and Biochar Production from Waste Flowers
    Richa Gupta, Ranjeet Kumar Mishra, and Kaustubha Mohanty
    American Chemical Society (ACS)
    Waste flowers constitute a significant portion of organic waste, offering the potential for sustainable waste management through pyrolysis. This study explores the pyrolysis behavior, kinetic parameters, and biochar production from waste flowers. Thermogravimetric analysis (TGA) was employed to examine thermal degradation characteristics under varying heating rates (10, 20, and 50 °C min–1). Kinetic analysis was performed using model-free methods such as the Friedman method (FM), Ozawa–Flynn–Wall (OFW), Starink method (STM), Kissinger–Akahira–Sunose (KAS), and Criado model to determine the pyrolysis kinetic parameters. Further, the biochar was produced in a semibatch reactor at 450 °C with a 10 °C min–1 heating rate and 100 mL min–1 nitrogen flow rate. The characterization of the biochar included proximate and elemental analysis, calorific value, bulk density, Brunauer–Emmett–Teller (BET) surface area, pH, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) analysis, and water-holding capacity. The decomposition results were confirmed in three stages: moisture removal, active pyrolysis, and residue formation. Kinetic results revealed a multistep reaction mechanism, with average activation energies of 236.35, 232.29, 234.74, and 221.50 kJ mol–1 derived from KAS, OFW, STM, and FM, respectively. Pyrolysis of marigold flowers (MG) yielded 36.64 wt % biochar at 450 and 10 °C min–1 heating rate. Further, the biochar exhibited a 57.10% carbon content, 33.57 MJ kg–1 higher heating value (HHV), 9.96 m2 g–1 BET surface area, and 29.14 mV zeta potential, demonstrating its potential for soil amendment, carbon sequestration, and pollutant adsorption. This study emphasizes the value of MG as a feedstock for biochar production, contributing to circular economy initiatives.


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