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sulfonic acid-functionalized mesoporous silica catalyst with different morphology for biodiesel production

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Frontiers of Chemical science and Engineering 2022年第8期16卷 1198-1210页

作者： Vinayak Hegde Parimal pandit Pranita Rananaware Varsha PBrahmkhatri Centre for Nano and Material sciences Jain UniversityJain Global CampusBengaluru 562112India

sulfonic acid functionalized mesoporous silica based solid acid catalysts with different morphology were designed and *** synthesized materials were characterized by various physicochemical and spectroscopic techniques like scanning electron microscopeenergy dispersive X-ray spectroscopy,Fourier transform infrared spectroscopy,Brunauer–Emmett–Teller surface area,thermogravimetric analysis and n-butylamine *** shape of catalysts particles plays an important role in its *** sulfonic acid functionalized mesoporous silica catalysts of spherical shape and the cube shape were assessed for catalytic activity in biodiesel *** catalytic biodiesel production reaction over the catalysts were studied by esterification of free fatty acid,oleic acid with *** effect of various reaction parameters such as catalyst concentration,acid/alcohol molar ratio,catalyst amount,reaction temperature and reaction time on catalytic activity were investigated to optimize the conditions for maximum *** was sulfonated cubic shape mesoporous silica which exhibited better activity as compared to the spherical shape silica ***,the catalyst was regenerated and reused up to three cycles without any significant loss in *** present catalysts exhibit superior performance in biodiesel production and it can be used for the several biodiesel feedstock’s that are rich in free fatty acids.

关键词： solid acid catalyst mesoporous silica sulfonic acid biodiesel esterification oleic acid

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Electrochemical engineering approach of high performance solid-state flexible supercapacitor device based on chemically synthesized Vs_2 nanoregime structure

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Journal of Energy Chemistry 2019年第4期28卷 79-88页

作者： Bidhan pandit Lakshmana Kumar Bommineedi Babasaheb R.sankapal Nano Materials and Device Laboratory Department of Physics Visvesvaraya National Institute of Technology

Portable and furnished electronics appliances demand power efficient energy storage devices where electrochemical supercapacitors gain much more *** this concern,a simple,low-cost and industry scalable successive ionic layer adsorption and reaction(sILAR)approach has been adopted to deposit nanostructured Vs_2onto flexible and light-weight stainless steel(ss)substrate towards supercapacitor *** nanocrystalline nature with hexagonal crystal structure has been confirmed for Vs_2through structural *** Vs_2electrode exhibits a maximum specific capacitance of 349 F g^(-1)with a super stable behavior in three-electrode liquid-state *** flexible symmetric solid-state supercapacitor(FssC)device using gel electrolyte yields specific power of 1.5 k W kg^(-1)(specific energy of 25.9 Wh kg^(-1))with a widen voltage window of 1.6 V.A red LED has been glown for30 s using the system consisted of two devices in series ***,the system glows a combination of 21 red LEDs network with acronym‘VNIT’,demonstrating commercial *** attribution of device demonstration even under mechanical stress holds great promise towards advanced flexible electronics application.

关键词： Chemical method vs2 supercapacitor Gel electrolyte symmetric device

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Utilization of Nanomaterials as Anode Modifiers for Improving Microbial Fuel Cells Performance

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Journal of Renewable Materials 2020年第12期8卷 1581-1605页

作者： Nishit savla Raksha Anand soumya pandit Ram Prasad Amity Institute of Biotechnology Amity UniversityMumbaiIndia Department of Life sciences School of Basic Sciences and ResearchSharda UniversityGreater Noida201306India Department of Botany Mahatma Gandhi Central UniversityBihar845401India

Microbial fuel cells(MFCs)are an attractive innovation at the nexus of energy and water security for the *** utilizes electrochemically active microorganisms to oxidize biodegradable substrates and generate bioelectricity in a single *** material of the anode plays a vital role in increasing the MFC’s power *** anode in MFC can be upgraded using nanomaterials providing benefits of exceptional physicochemical *** nanomaterials in anode gives a high surface area,improved electron transfer promotes electroactive *** power output in terms of Direct current(DC)can be obtained as the consequence of improved microbe-electrode ***,several limitations like complex synthesis and degeneration of property do exist in the development of nanomaterial-based *** present review discusses different renewable nanomaterial applied in the anode to recover bioelectricity in *** nanomaterials have emerged in the past decade as promising materials for anode con*** materials have also demonstrated the capacity to become potential anode materials of *** of a few transition metal oxides have been explored for efficient extracellular electron transport(EET)from microbes to the anode.

关键词： Microbial fuel cell(MFC) anodic modifications capacitance carbon nanotubes graphene porous carbons metallic nanomaterials power density coulombic efficiency

Chemical composition and source apportionment of PM2.5 and PM2.5-10 in Trombay （Mumbai, India）, a coastal industrial area

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Particuology 2018年第2期16卷 143-153页

作者： sandeep Police sanjay Kumar sahu Mahesh Tiwari Gauri Girish pandit Environmental Monitoring and Assessment section Bhabha Atomic Research Centre Mumbai 400085 India Homi Bhabha National Institute Anushakti Nagar Mumbai 400094 India

PM2.5 and PM2.5 lo concentrations, elemental constituents, and sources in a densely populated coastal industrial area （Trombay, Mumbai） were investigated in 2010 and *** PM2.s and PM2.s lo concentra- tions were 13.50-71.60 and 22.40-127.78 p^g/m3, respectively. The daily PM25 concentrations exceeded the Indian Central Pollution Control Board limit （60 μg/m3） several days in winter. Of the elements analyzed, si then Al had the highest concentrations in PM2.5- 10, but black carbon then si had the highest concentrations in PM2.s. The element concentrations varied widely by season. Al, Ca, Fe, si, and Ti con- centrations were highest in summer, Cl, Mg, and Na concentrations were highest in the monsoon season, and the other trace metal concentrations in both PM2.5 and PM2.5-10 were highest in winter. The PM2.5 and PM2.5-10 sources were apportioned by positive matrix factorization. PM2.5 and PM2.5-10 had six dominant sources, crustal material （8.7% and 25.3%, respectively）, sea salt spray （6.1% and 15.0%, respectively）, coal/biomass combustion （25.5% and 13.8%, respectively）, fuel oil combustion （19.0% and 11.2%, respectively）, road traffic （ 17.7% and 12.6%, respectively）, and the metal industry （ 10.6% and 7.0%, respectively）. Anthropogenic sources clearly contributed most to PM2.5 but natural sources contributed most to PM2.5-10.

关键词： Trombay PM2.5 PM2.5-10 Black carbon Metals Positive matrix factorization

Bioactive potential of natural biomaterials: identification, retention and assessment of biological properties

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signal Transduction and Targeted Therapy 2021年第4期6卷 1171-1198页

作者： Kieran Joyce Georgina Targa Fabra Yagmur Bozkurt Abhay pandit school of Medicine National University of IrelandGalwayIreland CURAM SFI Research Centre for Medical DevicesNational University of IrelandGalwayIreland

Biomaterials have had an increasingly important role in recent decades,in biomedical device design and the development of tissue engineering solutions for cell delivery,drug delivery,device integration,tissue replacement,and *** is an increasing trend in tissue engineering to use natural substrates,such as macromolecules native to plants and animals to improve the biocompatibility and biodegradability of delivered *** the same time,these materials have favourable mechanical properties and often considered to be biologically *** importantly,these macromolecules possess innate functions and properties due to their unique chemical composition and structure,which increase their bioactivity and therapeutic potential in a wide range of *** much focus has been on integrating these materials into these devices via a spectrum of cross-linking mechanisms,little attention is drawn to residual bioactivity that is often hampered during isolation,purification,and production ***,we discuss methods of initial material characterisation to determine innate bioactivity,means of material processing including cross-linking,decellularisation,and purification techniques and finally,a biological assessment of retained bioactivity of a final *** review aims to address considerations for biomaterials design from natural polymers,through the optimisation and preservation of bioactive components that maximise the inherent bioactive potency of the substrate to promote tissue regeneration.

关键词： biomaterials linking potential

Facile sILAR Processed Bi2s3∶Pbs solid solution on MWCNTs for High-performance Electrochemical supercapacitor

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Chinese Journal of Chemistry 2019年第12期37卷 1279-1286页

作者： Bidhan pandit shilpa A.Pande Babasaheb R.sankapal Nano Materials and Device Laboratory Department of PhysicsVisvesvaraya National Institute of TechnologySouth Ambazari RoadNagpur-440010MaharashtraIndia Department of Applied Physics Laxminarayan Institute of TechnologyR T M Nagpur UniversityNagpur 440033MaharashtraIndia

summary of main observation and conclusion Carbon based composite materials have gained much attention because of fulfilling desirable properties for supercapacitor *** the featured work,the thin film of Bi2s3∶Pbs solid solution has been synthesized on multi-walled carbon nanotubes(MWCNTs)by simple successive ionic layer adsorption and reaction(sILAR)*** nanoparticle morphology provides sufficient electroactive channels for electrolyte ions to penetrate during electrochemical *** composite exhibits superior specific capacitance 676 F/g at constant specific current density of 5.56 A/g with fast charge-discharge *** association of energy storage characteristics,the fabricated symmetric cell exhibits excellent energy density of 13.36 Wh/kg by acquiring power density of 0.83 kW/*** superior results of the hybrid electrode promise a novel direction for high performance supercapacitor application.

关键词： composite performance solid

Depth profiles of lithogenic and anthropogenic mercury in the sediments from Thane Creek,Mumbai,India

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International Journal of sediment Research 2014年第3期29卷 431-439页

作者： s.K.sAHU R.C.BHANGARE M.TIWARI P.Y.AJMAL G.G.pandit Environmental Monitoring and Assessment section Bhabha Atomic Research Centre Environmental.Monitoring and Assessment section Bhabha Atomic Research Centre

Mercury(Hg) is well known as one of the most toxic elements to *** coastal environments adjacent to industrial areas are reported to often be contaminated with *** becomes more toxic in the form of methylmercury(Me-Hg) which is converted from inorganic mercury in aqueous systems by microbial activity and can bio-magnify through the food chain.A simple method for the determination of total mercury and methylmercury in sediments was optimized by slightly modifying an old method using the direct mercury analyzer *** sediment samples from Thane Creek,Mumbai,India were collected and analysed for total mercury and *** Hg concentration in the creek varied between 0.54 to 16.03 μg gwhile Me-Hg concentrations ranged between0.04 to 1.07 μg *** surface sediment,mercury concentrations ranged from 4.33 μg gto 12.16μg *** organic carbon content was found to be around 2 percent in different layers of the *** enrichment factors,which indicate the extent of pollution in sediments,were estimated to range from 26 to 50 at different locations in the *** and anthropogenic concentrations of mercury in the creek were also determined to compare the impact of anthropogenic and natural *** inventories were about 5-70 times more in concentration than the lithogenic in the different core sediments.

关键词： Total mercury Methylmercury Enrichment factor Anthropogenic concentration TOC

Zeolitic imidazolate framework-67 derived Al-Co-s hierarchical sheets bridged by nitrogen-doped graphene:Incorporation of PANI derived carbon nanorods for solid-state asymmetric supercapacitors

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Journal of Energy Chemistry 2022年第11期31卷 429-445,I0012页

作者： Emad s.Goda Bidhan pandit sang Eun Hong Bal sydulu singu seong K.Kim Essam B.Moustafa Kuk Ro Yoon Kuk Ro Yoon Organic Nanomaterials Lab Department of ChemistryHannam UniversityDaejeon 34054Republic of Korea Gas Analysis and Fire safety Laboratory Chemistry DivisionNational Institute for Standards136Giza 12211Egypt Department of Materials science and Engineering and Chemical Engineering Universidad Carlos Ⅲ de MadridAvenida de La Universidad 3028911 LeganésMadridSpain Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical Engineering Hannam University1646 Yuseongdae-roYuseong-guDaejeon 34054Republic of Korea Mechanical Engineering Department Faculty of EngineeringKing Abdulaziz UniversityP.O.Box 80204Jeddah 22254Saudi Arabia

Metal sulfides have been widely enticed as battery-type electrodes in supercapacitor devices because of their maximal theoretical ***,their lower conductivity and ion transport kinetics can largely restrict their rate performance,hence the practical usage in fields of demanding high power ***,the design of new electrodes with higher energy and power densities remains a highly challenging *** the best of our knowledge,a novel hierarchical composite of Al-Cos_(2) on nitrogendoped graphene(NG)is prepared based on a zeolite imidazole framework using a simple and scalable hydrothermal *** this hybrid,ultrathin Al-Cos_(2) nanosheet arrays are vertically orientated on the NG framework to limit self-aggregation,hence increasing the electrical property and cycle stability of *** is investigated that the Al/Co feeding ratio plays a crucial role in controlling the obtained hierarchical structure of Al-Co-s sheets and their electrode ***,Al^(3+) can influence remarkably the morphology and electrochemical property of the resultant graphene *** effective synergism is noticed between the redox Al-Cos_(2) and NG resulting in fast electron transfer and chargingdischarging ***,when the as-developed composite is utilized as a positive electrode at an applied current density of 1 A/g,a specific capacitance of 1915.8 F/g is attained with ultra-long cycle stability(96%,10,000 cycles)and an excellent retention rate(~89%).As a consequence,when a solid-state asymmetric supercapacitor(AsC)device is made by combining an Al-Cos_(2) @NG hybrid with a negative electrode made of polyaniline(PANI)derived carbon nanorods(PCNRs),it demonstrates remarkable specific capacitance(188 F/g),energy density(66.9 Wh/kg),and cyclic stability of 92%after 10,000 *** may open the pathway for the application of the next-generation supercapacitors in the future.

关键词： Hierarchical sheets MOFs Al-doped Cos_(2) Nitrogen-doped graphene solid-state supercapacitor

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Automated Identification Algorithm Using CNN for Computer Vision in smart Refrigerators

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Computers, Materials & Continua 2022年第5期71卷 3337-3353页

作者： Pulkit Jain Paras Chawla Mehedi Masud shubham Mahajan Amit Kant pandit Chandigarh University Mohali140413India Department of Computer science College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia school of Electronics&Communication Engineering Shri Mata Vaishno Devi UniversityKatra182320India

Machine Learning has evolved with a variety of algorithms to enable state-of-the-art computer vision *** particular the need for automating the process of real-time food item identification,there is a huge surge of research so as to make smarter *** to a survey by the Food and Agriculture Organization of the United Nations(FAO),it has been found that 1.3 billion tons of food is wasted by consumers around the world due to either food spoilage or expiry and a large amount of food is wasted from homes and restaurants *** refrigerators have been very successful in playing a pivotal role in mitigating this problem of food *** a major issue is the high cost of available smart refrigerators and the lack of accurate design algorithms which can help achieve computer vision in any ordinary *** address these issues,this work proposes an automated identification algorithm for computer vision in smart refrigerators using InceptionV3 and MobileNet Convolutional Neural Network(CNN)*** designed module and algorithm have been elaborated in detail and are considerably evaluated for its accuracy using test images on standard fruits and vegetable datasets.A total of eight test cases are considered with accuracy and training time as the performance *** the end,real-time testing results are also presented which validates the system’s performance.

关键词： CNN computer vision Internet of Things(IoT) radio frequency identification(RFID) graphical user interface(GUI)