Kalpana Patidar

EDUCATION

Ph.D. in Chemical Engineering from MNIT, Jaipur
M.Tech. in Chemical Process Design with a CGPA of 8.36 on 10 points scale from MANIT, Bhopal
B.E. (Honours) in Chemical Engineering with a CGPA of 7.54 on 10 points scale from Ujjain Engineering College Ujjain

RESEARCH INTERESTS

Biomass Energy, Environmental and Sustainable, Wastewater Treatment

Scopus Publications

Investigation of kinetic and thermodynamic parameters approaches to non-isothermal pyrolysis of mustard stalk using model-free and master plots methods
Kalpana Patidar, Ajit Singathia, Manish Vashishtha, Vikas Kumar Sangal, Sushant Upadhyaya
Materials Science for Energy Technologies, 2022
Present work based on thermogravimetric analysis (TGA) to decipher in detail the pyrolysis of mustard stalk (MS) for investigating its potential for bioenergy feedstock at three heating rates (5, 10, and 20 °C/min). The thermal degradation behaviors of MS were carried out at three heating rates (5, 10, and 20 °C/min). The kinetic and thermodynamic parameters were examined using model-free isoconversional Flynn- Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) model. The obtained activation energy for pyrolysis of MS using FWO and KAS to be 132.47 and 130.62 kJ/mol. Kissinger method was used to compute pre-exponential factor found to be in the range of 105 to 1016 s−1 at different heating rates. The average ΔH was 127.70, and 125.8 kJ/mol and ΔG is 127.74 and 127.87 kJ/mol from FWO and KAS respectively, all ΔH positive indicated endothermic nature. The Coats-Redfern approach was used to estimate the thermal degradation reaction mechanism, which revealed that the diffusion model was best suited to reflect the degradation process involving both exothermic and endothermic reactions. The analysis can help augment the experimental studies, and physicochemical characterization revealed its fuel characteristic since MS is sustainable and promising biomass for alternative processes in terms of waste management strategies.
Activated carbon from mustard stalk biomass: Synthesis, characterization and application in wastewater treatment
Kalpana Patidar, Manish Vashishtha
Journal of the Serbian Chemical Society, 2021
Present work is focused on the preparation of mustard stalk activated carbon (MSAC) using chemical activation with H3PO4 and exploring its properties for its use in dye removal from wastewater. Adsorption variable (dosage, contact time, and solution pH), pore structure, morphology, surface functional groups, equilibrium kinetics and isotherm study for the removal of methylene blue (MB) using MSAC were investigated. The present study showed that an adsorption dosage of 0.2 g L-1 and pH 8 can be considered as optimum for the MB removal. SEM result showed that pore of MSAC was larger than the pore of the mustard stalk (MS). BET surface area and total pore volume of MSAC were found as 510 m2 g-1 and 0.33 cm3 g-1, respectively. Equilibrium adsorption data were examined by Langmuir and Freundlich isotherm models. Better correspondence to the Langmuir model with a maximum adsorption capacity of 212.76 mg g-1 (MB onto MSAC) was obtained. Dimensionless factor, RL revealed favourable nature of the sorption in the MSAC?MB system. Adsorption rates were found to follow the pseudo-second-order kinetics with good correlation. These results show that the MSAC could be used as a renewable and economical alternative to commercial activated carbon in the removal of MB dye from wastewater.
Property enhancement of mustard stalk biomass by Torrefaction: Characterization and optimization of process parameters using response surface methodology
Manish Vashishtha, Kalpana Patidar
Materials Science for Energy Technologies, 2021
Present work is devoted to the study of independent operating parameters namely torrefaction temperature (TT), residence (torrefaction) time (RT), and heating rate (HR) on the slow pyrolysis or torrefaction of an important agro residue namely mustard stalk (MS). Response surface methodology along with three-factor and three-level Box-Behnken design is applied to find the effect of above mentioned three parameters on the higher heating value, energy yield, and fixed carbon of the torrefied MS. Experimentation and modeling analysis reveal that the effect of these three factors' responses follows the sequence: (TT) > (RT) > (HR). Also, the experimental data were analyzed using analysis of variance and fitted to a second-order polynomial model applying multiple regression analysis. Predictive models were obtained which were able to satisfactorily fit the experimental data, with the coefficient of determination (R2) values higher than 0.95. Derringer’s desirability function methodology was used for the optimization study which showed that the HHV, EY, and FC at optimum condition TT 300 °C, RT 20 min, HR 5 °C/min were obtained as 21.26 MJ/kg, 81.26 %, and 35.38 wt%, respectively for MS. Torrefied MS, as compared to raw MS, showed better solid fuel properties for co-combustion with coal and gasification. The experimental values closely agree with the corresponding predicted values. The functional behavior of raw and torrefied MS was studied by Fourier Transform Infra-Red Spectrometry.
Mitigating Water Pollution Using a Sustainable Biobased Low-Cost Adsorbent Derived from Mustard Straw
Kalpana Patidar, Manish Vashishtha, Sonal Rajoria, Tarun Kumar Chaturvedi
Asian Journal of Water Environment and Pollution, 2021
The present work is focussed on treating dye-laden polluted water by using a mustard straw-based activated carbon prepared using ZnCl2 and H3PO4 activation methods. The activation conditions based on the parameters reported in the literature are taken as follows: 700 °C activation temperature, impregnation ratio 2.0, and heating time 2 h. The textural and surface properties of mustard stalk activated carbon (MSAC) were studied by using SEM, nitrogen adsorption, and FT-IR, whereas its adsorption capacity was obtained using the methylene blue (MB) adsorption method. Activation of ZnCl2 and H3PO4 resulted in a BET surface area of 402 and 496 m2/g, respectively. The average pore diameter of the MSAC was found to be 2.13 and 2.59 nm for ZnCl2 and H3PO4 activation respectively. The Langmuir and Freundlich models were applied to evaluate the equilibrium parameters of MB adsorption. The monolayer adsorption capacity of MSAC by ZnCl2 and H3PO4 for MB removal from the Langmuir model were 122.25 and 213.21 mg/g respectively. Activation with H3PO4 was found to be more effective in modifying the structure of the mustard straw when compared with ZnCl2 and also it resulted in a higher adsorption capacity of MB. The present work highlights that the MSAC produced using H3PO4 activation is a low-cost bio-based adsorbent using abundant agricultural by-product namely mustard straw, and this adsorbent can be used in numerous industrially important applications.
Optimization of Process Variables to Prepare Mesoporous Activated Carbon from Mustard Straw for Dye Adsorption Using Response Surface Methodology
Kalpana Patidar, Manish Vashishtha
Water Air and Soil Pollution, 2020
Characterization and isotherm study of activated carbon production from mustard stalk by ZnCl2 activation
Journal of the Indian Chemical Society, 2020
Impact of torrefaction conditions on the physicochemical properties of mustard crop residue
Kalpana Patidar, Manish Vashishtha
Materials Today Proceedings, 2020