Department of Chemical Engineering
Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1923
Browse
11 results
Search Results
Item Thermo-mechanical characterization of phenolic woven composite laminates for use in fire/blast-prone aircraft baggage structures(Wiley, 2025-10) Singh, Shamsher Bahadur; Roy, Banasri; Barai, Sudhir KumarThis paper experimentally investigates the thermal and mechanical performance of woven phenolic laminates reinforced with carbon (PF-CFRP), glass (PF-GFRP), basalt (PF-BFRP), and Kevlar (PF-KFRP), aiming to evaluate their suitability for aircraft baggage structures under fire and blast loads. Phenolic resin cured under single-stage high-temperature conditions (PF100) demonstrated a superior glass transition temperature of 150.0°C, tensile modulus of 2.61 GPa, and tensile strength of 32.51 MPa. Thermogravimetric analysis revealed that PF-CFRP retained 87.9% mass at 800°C under nitrogen, while PF-BFRP retained the highest mass in air (79.1%), followed by PF-GFRP (66.3%). PF-KFRP exhibited poor thermal stability (47.7%), even lower than the neat resin (58.9%) under nitrogen. PF-CFRP exhibited the highest modulus and strength, with 68.50 GPa and 776.78 MPa, respectively, and an in-plane shear strength of 110.46 MPa. PF-BFRP showed the highest flexural strength of 362.93 MPa, excellent tensile strength of 587.63 MPa, and improved bending failure strain of 2.25%. PF-GFRP exhibited moderate mechanical performance, with tensile and flexural strengths of 224.11 MPa and 292.59 MPa, respectively, with consistent shear performance. PF-KFRP exhibited the highest failure strain (2.76% in tension), but weak interfacial bonding. Scanning electron microscopy revealed distinctive failure modes, including fiber breakage, pull-out, delamination, and matrix cracking. Radar plots were used for comparative visualization, identifying PF-BFRP as optimal for blast/fire resilience and PF-CFRP for stiffness-critical zones. Overall, the study highlights the potential of basalt-phenolic composites and recommends functionally graded hybrid composites as next-generation materials for aircraft baggage structures under combined mechanical and thermal conditions.Item Rare shungite carbon, carbon nanotubes and magnesium oxide nanoparticle based composite paste electrode for electrochemical lead ion detection(Elsevier, 2026-02) Roy, Banasri; Chatterjee, SomakComposite paste was synthesized using magnesium oxide nanoparticles with shungite carbon and multi-walled carbon nanotubes, to formulate two-electrode sensor, facilitating lead detection in aqueous stream. A uniform and homogeneously dispersed composite paste was obtained using the powder with a binder, i.e., silicone oil. Working electrode only comprises magnesium oxide nanoparticles, which was paired with reference electrode to measure potential against various lead concentration. Various factors including concentration of MgO, electrolyte pH, temperature, electrode-separation, detection time and real water sample analysis were examined to optimize sensor's performance. Most effective sensor was then chosen for electrochemical characterizations, which include, cyclic voltammetry, electrochemical impedance spectroscopy, differential pulse voltammetry across different electrolyte concentrations, i.e., lead. Amperometric analysis evaluated influence of co-existing ions, whereas leachate solution studies quantified ion content from working electrode. Electrochemically active surface area and surface coverage areas were measured as 0.022 cm2 and 0.036 cm2, and 2.85 mM.cm−2 and 2.39 mM.cm−2 for unmodified and modified electrodes. Sensor exhibited quasi-reversible behavior with sensitivities of 2.75 mA.cm−2.mg.L−1 and 0.0275 mA.cm−2.mg.L−1, along with detection limits of 0.3 μg.L−1 and 57 μg.L−1 over dynamic ranges. This performance, combined with low fabrication cost (~31.6 US$.g−1), presents a competitive and economical alternative against different commercial lead sensors.Item Graphene oxide-iron oxide based thin film nanocomposite membrane for congo red dye removal and simultaneous salt recovery from aqueous stream(Springer Nature, 2025-11) Roy, Banasri; Chatterjee, SomakCurrent work focusses on the synthesis of iron oxide impregnated-graphene oxide incorporated polyvinylidene fluoride based thin-film nanocomposite (TFN) membrane and its application in Congo Red dye removal. Interfacial polymerization with 0.02 wt% graphene oxide significantly improved performance of prepared TFN membranes, achieving over 94% rejection of dye with permeability of 3.6 l/m2·h·bar. Testing performance of the membrane was further validated in the presence of real-life feed wastewater, showing 72% dye rejection over 12 h, while an enhanced 94% rejection was achieved with synthetic dye solution. Superior performance was observed in removal of dissolved solids, conductivity, salinity, nitrate, sulfate and dyes compared to commercial nanofiltration membranes. Effect of different operating conditions on membrane performance were examined, confirming its robust nature. Comprehensive characterization of prepared membrane revealed its superiority in texture and chemical nature. Optimized TFN membrane demonstrated recovery efficiency of 70% for sodium chloride and magnesium sulfate solutions, indicating its potential for desalination approach. Thermal regeneration and long-term filtration studies were conducted to evaluate membrane’s lifespan, indicating long-term durability and effectiveness in industrial applications. Studies also indicated weight loss of 62% over two months, which corroborated biodegradable nature of the membrane samples after exhaustion.Item Impact of protein nanoparticles on beer foam(Springer, 2023-06) Roy, Banasri; Chattopadhyay, PradiptaBeer foam adds a visual aesthetic to the beer- a good beer foam layer presents the beer as fresh and tasty and attracts customers. Beer foam also helps in maintaining the flavor of the beer by acting as an airtight blanket preventing the escape of CO2 from the beer. Thus, stable, long-lasting beer foam is preferred in the final product irrespective of consumer preferences. Beer foam stability is impacted by the proteins and protein nanoparticles. This work encompasses the effects that proteins and protein nanoparticles have on foaming in beer. Studies regarding the impact of protein nanoparticles on the quality of beer foam are also discussed.Item Reforming of model biogas using Ni/CeO2/γ-Al2O3 monolith catalyst(Elsevier, 2023) Roy, Banasri; Srinivas, AppariThis study aims to develop a Ni-Ce coated alumina cordierite monolith for reforming model biogas. Dry reforming of biogas (DRBG) experiments are carried out at 800 °C for various ratios of CH4/CO2, mainly 1.0, 1.5, and 2.0. A 2 × 2 cm monolith is wash-coated with alumina and loaded with Ni-Ce by the wet impregnation method. For improving metal support interactions, the monoliths are calcined at 800 °C for 20 h and reduced in the presence of H2. The catalysts exhibited a CH4 conversion of 91%, 60%, and 48% and CO2 conversions of 60%, 80%, and 81% for a feed ratio of 1.0, 1.5, and 2.0, respectively. The prepared catalysts are characterized by employing various techniques such as XRD and FESEM incombined with EDS and Raman analysis. XRD of calcined catalysts displayed the phases of CeO2, Al2O3, NiO, NiAl2O4, and the monolith peaks and catalysts showed a stable activity for 40 h time-on stream for all the ratios. The Raman and FESEM analysis of spent catalysts reveal the presence of carbon deposition. However, catalysts showed high activity due to active Ni particles present on the top of the carbon nanotubes.Item Steam reforming of ethanol for hydrogen production by low-temperature steam reforming using modified Ni-Sn/CeO2 catalyst(Elsevier, 2023) Roy, Banasri; Srinivas, AppariThis study focuses on the development of Ni-Sn bimetallic catalysts supported on ZrO2 modified CeO2 and their application for low temperature steam reforming of ethanol (LTSRE) at different temperature 200–400 °C. The catalyst powders are prepared by an ultrasonic-assisted solution combustion synthesis method. The ethanol conversion and selectivity of H2, CO2, CO, and CH4 has been studied with feed composition H2O:EtOH = 12: 1 mol ratio, feed flow rate 0.1 cc/min, and reaction time 20 hrs. Fresh and spent catalysts are characterized using XRD, FTIR, Raman, FESEM, XPS, and TGA-DTA. ZrO2 changes the support chemistry and enhances the activity and stability of the catalyst. At 400 °C, 100 % ethanol (EtOH) conversion, 69 % H2 selectivity with least coke deposition is observed for the catalyst with 5 wt% metal (Ni:Sn = 14:1) loading on Ce:Zr 1:2 mol ratio (NiSn5/CZ12) support.Item Dual reforming of model biogas for syngas production on Ni/γ-Al2O3 and Ni-C/ZSM-5 cordierite monolith catalysts(Elsevier, 2023) Roy, Banasri; Srinivas, AppariThis work attempts to convert the model biogas on Ni/γ-Al2O3 and Ni-C/ZSM-5 into syngas using a dual-bed catalytic monolith reactor. The monolith is wash-coated with alumina and ZSM-5, respectively, followed by Ni and glucose-assisted Ni (Ni-C) loading using the wet impregnation technique. These two monoliths are loaded in an Inconel reactor and placed in a two-zone heating furnace. In dual reforming, either Ni/γ-Al2O3 or Ni-C/ZSM-5 monolith is used for dry reforming, and then Ni/γ-Al2O3 is used for steam reforming. A distance of ∼ 10 cm is maintained between these two monoliths. The exhaust gases from the first monolith are combined with steam before passing to the second monolith. The biogas reforming is carried out for a feed ratio (CH4:CO2) 1.5, GHSV of 1440 h−1 and 2880 h−1, at 800℃ and 1 atm pressure. The steam to CH4 ratio (S/C) is optimized to maximize the conversions (greater than80 %) of both CH4 and CO2. It was observed that the CH4 conversions increase with an increased S/C ratio due to the steam reforming in the second monolith. The TGA results show 7.6 % carbon formation on Ni-C/ZSM-5 and 35 % on Ni/γ-Al2O3 in dry reforming on the first monolith bed.Item Synthesis of graphene-type materials from agricultural residues(Springer, 2023-06) Roy, BanasriPreparation of graphene oxides (GO) from sugarcane bagasse and wheat straw is reported in this paper. Both of the crop residues are converted to graphite using low-temperature ferrocene method and high-temperature catalytic graphitization using iron and nickel nitrate powder. Iron nitrate was found out to be the superior catalyst compared to nickel nitrate at carbonization temperatures of 900 and 1200 °C. Improved Hummer’s method is applied for the synthesis of graphene oxide from graphite powders. The GO powders synthesized from wheat straw along with iron nitrate at 900 °C and sugarcane bagasse along with iron nitrate at 1200 °C were observed to be the best, while the graphite prepared using ferrocene method could not be converted to GO as confirmed by XRD, FTIR, RAMAN results, and the presence of oxygen in graphene oxide is determined by morphological studies using FESEM and TEM techniquesItem Recent trends in nanotechnology for sustainable living and environment:(Springer, 2023) Roy, Banasri; Ghosh, Sarbani; Etika, Krishna ChitanyaThis book presents the select proceedings of International Conference on Nanotechnology for Sustainable Living and Environment (ICON-NSLE 2022). It covers the latest trends in nanotechnology and its applications in various sectors such as energy, environment, food technology, and biomedicine. Various topics covered in this book are nanomaterial preparation and characterization, nanobiotechnology, nanodevices, waste to wealth, pollution abatement, renewable energy, advanced materials, sensors and portable electronics, biomedical applications, food preservation, etc. This book is useful for researchers and professionals working in the area of nanotechnology and environment sustainability.Item Investigation of Ba doping in A-site deficient perovskite Ni-exsolved catalysts for biogas dry reforming(Elsevier, 2024-08) Roy, BanasriThis work presents the development of an A-site deficient La0.9−xBaxAl0.85Ni0.15O3 (x = 0, 0.02, 0.04, and 0.06) perovskite oxide catalyst for dry reforming of model biogas. The catalysts are prepared using a citrate sol-gel method and used for biogas dry reforming at 800 °C for feed ratios (CH4/CO2) of 1.5 and 2.0. The fresh and spent catalysts are analyzed using XRD, FTIR, TPD, XPS, FESEM, TEM, TPR, TGA-DTA, and Raman analysis. The XRD analysis exhibits the host perovskite oxide structure and the exsolved Ni phase for all prepared catalysts. The partial doping of Ba improves the metal support interaction and oxygen vacancies that enhance catalytic activity and stability, as revealed by the TPR and XPS analysis. The stability experiment on La0.9−xBaxAl0.85Ni0.15O3, for x = 0 catalyst resulted in reduced activity due to the catalyst deactivation by sintering, as confirmed by XRD and FE-SEM. Among all the catalysts studied, La0.84Ba0.06Al0.85Ni0.15O3 (LB6AN-15) exhibited the highest catalytic stability with CH4, and CO2 conversions are 60% and 93%, respectively, for 40 h time-on-stream due to the strong metal support interactions, high oxygen vacancies, and anti-sintering of exsolved Ni nanoparticles in biogas dry reforming.