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Papers by Ashanendu Mandal

Research paper thumbnail of Phenol Adsorption by Biological and Industrial Wastes and ANN Modeling

Effective Waste Management and Circular Economy, Jul 17, 2022

Research paper thumbnail of The study of adsorption efficiency of rice husk ash for removal of phenol from wastewater with low initial phenol concentration

SN Applied Sciences

This research work aimed to assess the adsorption efficiency of rice husk ash for removal of phen... more This research work aimed to assess the adsorption efficiency of rice husk ash for removal of phenol from wastewater. The authors studied the morphology and characterization of rice husk ash using SEM, FTIR, XRD and BET analyzers and carried out the batch experiments to evaluate the removal percentage of phenol with variation of pH (3-11), adsorption time (30-270 min), adsorbent dose (0.5-4.0 gm/L), phenol concentration (5-20 mg/L) and temperature (25-35 °C). It was observed that the maximum removal reached as high as 95%. The testing of kinetic models showed that the secondorder model was better than the first-order model. Elovich model showed that the adsorption process was chemical, Reichenberg model showed that adsorption occurred because of film diffusion, Furusawa and Smith model showed that phenol moved faster from bulk to solid stage, Boyd model indicated that the process supported chemisorptions, and Fick's model implied that film and intraparticle diffusion took 45 min and 135 min, respectively. Testing of isotherm models indicated that Langmuir, Freundlich and Temkin models were all supportive of equilibrium data. The Dubinin-Radushkevich isotherm indicated that the process was explained by feeble physical adsorption. The isothermal study indicated that the process was random, endothermic and spontaneous. Although some studies had been done for removal of phenol using rice husk ash in the past, this research had covered the extensive works on the characterization of the adsorbent, extent of phenol removal with the variation of several process variables, and testing of several models in the areas of kinetics, isotherms, and thermodynamics. Further, the novelty of this research was that the experiments were carried out for treatment of wastewater exclusively with low initial phenol concentrations so that the results can be effectively applied in several small-and medium-scale industries at lesser costs, particularly in the Third World countries.

Research paper thumbnail of International Conference on Green Chemistry and Renewable Energy May 17-18 , 2021

Tetranuclear molybdenum(vi) hydrazonato epoxidation (pre)catalysts: Is water always the best choi... more Tetranuclear molybdenum(vi) hydrazonato epoxidation (pre)catalysts: Is water always the best choice? M etallosupramolecular chemistry area has grown exponentially with a key role of multinuclear metal complexes (MMC) [1,2].The most interesting and challenging MMS are metal-organic frameworks (MOF) and self-assembled supramolecular coordination complexes (SCC), applied for sensing and molecular recognition. SSC are very interesting for their catalytic performance.S ingle-or mixed-linker tetrahedral coordination cages (Mn,Cr,Fe) with Mn(salen) and Cr(salen) moieties catalysed sequential asymmetric epoxidation/epoxide ring-opening reaction [3], while trinuclear Zr catalyst was active for ethylene polymerization. Inspired by the latter, we tested tetranuclear molybdenum(VI) aroylhydrazonato compounds, [MoO4L], as cyclooctene and cyclohexene epoxidation (pre)catalysts, with tert-butyl hydroperoxide available in water or decane. No organic solvent was added, following the green quote: The best solvent is no solvent. With cyclooctene, catalysts showed very good activity and selectivity towards epoxide with both oxidants. In cyclohexene (ep) oxidation, with TBHP in decane, catalytic activity was moderate with good selectivity towards epoxide, while with TBHPaq catalytic results were interesting in terms of diol formation, furtherly employed for adipic acid production. DFT calculations were used to support and explain experimental catalytic result for tetranuclear self-assembled systems. Acknowledgement: This work has been supported in part by Croatian Science Foundation under the project (IP-2016-06-4221). LCC CNRS and IUT Chem Dept are acknowledged for the facilities in terms of calculation time and equipment for the catalysis experiments. Audience Take Away: • Tetranuclear complexes are the area of rapidly growing metallosupramolecular chemistry. • Catalysis under environmentally friendlier conditions with the use of TBHP in decane and TBHP in water. • Green metrics parameters discussed and explained in details. • This is research that other faculty could use to expand their research or teaching. Furthermore, it provides a practical solution to a problem and gives insight in a detailed calculation of green metrics of the process on a lab-scale.

Research paper thumbnail of Fixed-bed column study for removal of phenol by neem leaves – Experiment, MLR and ANN analysis

Sustainable Chemistry and Pharmacy

Research paper thumbnail of Adsorptive removal of phenol from wastewater using guava tree bark

Environmental Science and Pollution Research

Research paper thumbnail of Phenol removal from wastewater using low-cost natural bioadsorbent neem (Azadirachta indica) leaves: Adsorption study and MLR modeling

Sustainable Chemistry and Pharmacy

Research paper thumbnail of Thermodynamics, kinetics, and isotherms for phenol removal from wastewater using Red Mud

Water Practice and Technology

The phenol removal through adsorption using industrial waste has been studied. The red mud genera... more The phenol removal through adsorption using industrial waste has been studied. The red mud generated as waste in the aluminum plants was used in this research. The surface characterizations of red mud were assessed. The batch experiment was investigated with pH (2–12), adsorption period (120–600 min), phenol content (40–200 mg/L), adsorbent dose (2–7 g/L), and temperature (30–50 °C). At the optimum operating condition, the percentage of phenol removal was 87.5%. The pseudo-second-order kinetic model (r2 = 0.98625–0.99994) was fitted better than the pseudo-first-order kinetic model. The Freundlich isotherm model was best fitted (r2 = 0.99734–0.99955) among Langmuir, D-R, and Temkin isotherms. The Langmuir monolayer adsorption capacity was 49.30966 mg/g at 30 °C. The adsorption mechanisms were supported by Reichenberg, Fick, Elovich, Furusawa, and Smith and Boyd models (r2 > 0.8). The thermodynamics suggested for endothermic, random, and spontaneous adsorption above 50 °C. The scal...

Research paper thumbnail of Adsorptive Removal of Phenol by Activated Alumina and Activated Carbon from Coconut Coir and Rice Husk Ash

Water Conservation Science and Engineering

Research paper thumbnail of Phenol Adsorption from Wastewater using Clarified Sludge from Basic Oxygen Furnace

Journal of Environmental Chemical Engineering

Research paper thumbnail of Phenol Adsorption by Biological and Industrial Wastes and ANN Modeling

Effective Waste Management and Circular Economy, Jul 17, 2022

Research paper thumbnail of The study of adsorption efficiency of rice husk ash for removal of phenol from wastewater with low initial phenol concentration

SN Applied Sciences

This research work aimed to assess the adsorption efficiency of rice husk ash for removal of phen... more This research work aimed to assess the adsorption efficiency of rice husk ash for removal of phenol from wastewater. The authors studied the morphology and characterization of rice husk ash using SEM, FTIR, XRD and BET analyzers and carried out the batch experiments to evaluate the removal percentage of phenol with variation of pH (3-11), adsorption time (30-270 min), adsorbent dose (0.5-4.0 gm/L), phenol concentration (5-20 mg/L) and temperature (25-35 °C). It was observed that the maximum removal reached as high as 95%. The testing of kinetic models showed that the secondorder model was better than the first-order model. Elovich model showed that the adsorption process was chemical, Reichenberg model showed that adsorption occurred because of film diffusion, Furusawa and Smith model showed that phenol moved faster from bulk to solid stage, Boyd model indicated that the process supported chemisorptions, and Fick's model implied that film and intraparticle diffusion took 45 min and 135 min, respectively. Testing of isotherm models indicated that Langmuir, Freundlich and Temkin models were all supportive of equilibrium data. The Dubinin-Radushkevich isotherm indicated that the process was explained by feeble physical adsorption. The isothermal study indicated that the process was random, endothermic and spontaneous. Although some studies had been done for removal of phenol using rice husk ash in the past, this research had covered the extensive works on the characterization of the adsorbent, extent of phenol removal with the variation of several process variables, and testing of several models in the areas of kinetics, isotherms, and thermodynamics. Further, the novelty of this research was that the experiments were carried out for treatment of wastewater exclusively with low initial phenol concentrations so that the results can be effectively applied in several small-and medium-scale industries at lesser costs, particularly in the Third World countries.

Research paper thumbnail of International Conference on Green Chemistry and Renewable Energy May 17-18 , 2021

Tetranuclear molybdenum(vi) hydrazonato epoxidation (pre)catalysts: Is water always the best choi... more Tetranuclear molybdenum(vi) hydrazonato epoxidation (pre)catalysts: Is water always the best choice? M etallosupramolecular chemistry area has grown exponentially with a key role of multinuclear metal complexes (MMC) [1,2].The most interesting and challenging MMS are metal-organic frameworks (MOF) and self-assembled supramolecular coordination complexes (SCC), applied for sensing and molecular recognition. SSC are very interesting for their catalytic performance.S ingle-or mixed-linker tetrahedral coordination cages (Mn,Cr,Fe) with Mn(salen) and Cr(salen) moieties catalysed sequential asymmetric epoxidation/epoxide ring-opening reaction [3], while trinuclear Zr catalyst was active for ethylene polymerization. Inspired by the latter, we tested tetranuclear molybdenum(VI) aroylhydrazonato compounds, [MoO4L], as cyclooctene and cyclohexene epoxidation (pre)catalysts, with tert-butyl hydroperoxide available in water or decane. No organic solvent was added, following the green quote: The best solvent is no solvent. With cyclooctene, catalysts showed very good activity and selectivity towards epoxide with both oxidants. In cyclohexene (ep) oxidation, with TBHP in decane, catalytic activity was moderate with good selectivity towards epoxide, while with TBHPaq catalytic results were interesting in terms of diol formation, furtherly employed for adipic acid production. DFT calculations were used to support and explain experimental catalytic result for tetranuclear self-assembled systems. Acknowledgement: This work has been supported in part by Croatian Science Foundation under the project (IP-2016-06-4221). LCC CNRS and IUT Chem Dept are acknowledged for the facilities in terms of calculation time and equipment for the catalysis experiments. Audience Take Away: • Tetranuclear complexes are the area of rapidly growing metallosupramolecular chemistry. • Catalysis under environmentally friendlier conditions with the use of TBHP in decane and TBHP in water. • Green metrics parameters discussed and explained in details. • This is research that other faculty could use to expand their research or teaching. Furthermore, it provides a practical solution to a problem and gives insight in a detailed calculation of green metrics of the process on a lab-scale.

Research paper thumbnail of Fixed-bed column study for removal of phenol by neem leaves – Experiment, MLR and ANN analysis

Sustainable Chemistry and Pharmacy

Research paper thumbnail of Adsorptive removal of phenol from wastewater using guava tree bark

Environmental Science and Pollution Research

Research paper thumbnail of Phenol removal from wastewater using low-cost natural bioadsorbent neem (Azadirachta indica) leaves: Adsorption study and MLR modeling

Sustainable Chemistry and Pharmacy

Research paper thumbnail of Thermodynamics, kinetics, and isotherms for phenol removal from wastewater using Red Mud

Water Practice and Technology

The phenol removal through adsorption using industrial waste has been studied. The red mud genera... more The phenol removal through adsorption using industrial waste has been studied. The red mud generated as waste in the aluminum plants was used in this research. The surface characterizations of red mud were assessed. The batch experiment was investigated with pH (2–12), adsorption period (120–600 min), phenol content (40–200 mg/L), adsorbent dose (2–7 g/L), and temperature (30–50 °C). At the optimum operating condition, the percentage of phenol removal was 87.5%. The pseudo-second-order kinetic model (r2 = 0.98625–0.99994) was fitted better than the pseudo-first-order kinetic model. The Freundlich isotherm model was best fitted (r2 = 0.99734–0.99955) among Langmuir, D-R, and Temkin isotherms. The Langmuir monolayer adsorption capacity was 49.30966 mg/g at 30 °C. The adsorption mechanisms were supported by Reichenberg, Fick, Elovich, Furusawa, and Smith and Boyd models (r2 > 0.8). The thermodynamics suggested for endothermic, random, and spontaneous adsorption above 50 °C. The scal...

Research paper thumbnail of Adsorptive Removal of Phenol by Activated Alumina and Activated Carbon from Coconut Coir and Rice Husk Ash

Water Conservation Science and Engineering

Research paper thumbnail of Phenol Adsorption from Wastewater using Clarified Sludge from Basic Oxygen Furnace

Journal of Environmental Chemical Engineering