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Dive into the research topics where Sumit H. Dhawane is active.

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Featured researches published by Sumit H. Dhawane.


Desalination and Water Treatment | 2015

Defluoridation of wastewater using powdered activated carbon developed from Eichhornia crassipes stem: optimization by response surface methodology

Gopinath Halder; Kankana Sinha; Sumit H. Dhawane

AbstractThe present investigation describes the removal of fluoride from synthetically fluoridated water using powdered activated carbon (PAC) developed through steam activation of carbonized Eichhornia crassipes stem by series of batch sorption experiments. Process is optimized by response surface methodology and experimental matrix is developed by central composite rotatable design. Influence of five different parameters viz. pH, adsorbent dose, temperature, contact time, and revolutions per minute (RPM) were studied in the range of 2–12, 2–12 g/L, 20–60°C, 20–180 min, and 100–300, respectively. Prepared PAC was characterized to obtain physical properties and instrumentally analyzed to observe surface texture of raw PAC and spent PAC with fluoride using methods viz. SEM, EDAX, and XRD. Physical properties, such as surface area and total pore volume, obtained equal to 97.68 m2/g and 0.5185 cm3/g, respectively. From the performed experiments for fixed initial concentration of 10 mg/L, maximum fluoride rem...


Biofuels | 2015

Acid-catalyzed esterification of castor (Ricinus communis) oil: optimization through a central composite design approach

Seema Halder; Sumit H. Dhawane; Tarkeshwar Kumar; Gopinath Halder

The present investigation emphasizes the dynamic modeling and optimization of acid esterification of non-edible castor (Ricinus communis) oil towards reduction of free fatty acid (FFA) content considering four process parameters, namely reaction time (0–4 h), reaction temperature (40–80°C), catalyst concentration (0.25–3.25 w/w) and molar ratio of methanol to oil (1:1–20:1) by the response surface methodology 24 full factorial central composite design approach. A quadratic model was developed to evaluate considerable interactive effects on FFA. Reaction temperature exhibited the most significant effect among all of the process variables. Optimal conditions during which the FFA was reduced from 4.04 to 1.08% were: 1% w/w concentrated H2SO4, 15:1 molar ratio of methanol to oil, reaction temperature 50°C and reaction time 2.09 h. Experimental verification of the predicted condition ensured an actual FFA of 1.14%. The small error (0.0634) between the predicted and actual FFA values ascertained the validity and accuracy of the model in representing the experimental data and predicting conversion at any condition within the studied range. Hence, this pre-treatment under optimized conditions could overcome the major constraint of high FFA, thereby rendering suitability for base transesterification.


Renewable Energy | 2016

Biodiesel synthesis from Hevea brasiliensis oil employing carbon supported heterogeneous catalyst: Optimization by Taguchi method

Sumit H. Dhawane; Tarkeshwar Kumar; Gopinath Halder


Energy Conversion and Management | 2015

Central composite design approach towards optimization of flamboyant pods derived steam activated carbon for its use as heterogeneous catalyst in transesterification of Hevea brasiliensis oil.

Sumit H. Dhawane; Tarkeshwar Kumar; Gopinath Halder


Energy Conversion and Management | 2016

Parametric effects and optimization on synthesis of iron (II) doped carbonaceous catalyst for the production of biodiesel

Sumit H. Dhawane; Tarkeshwar Kumar; Gopinath Halder


Environmental Progress | 2015

Optimizing chromium (VI) adsorption onto superheated steam activated granular carbon through response surface methodology and artificial neural network

Gopinath Halder; Sumit H. Dhawane; Prabir K. Barai; Abhijna Das


Renewable Energy | 2017

Parametric optimization of biodiesel synthesis from rubber seed oil using iron doped carbon catalyst by Taguchi approach

Sumit H. Dhawane; Akash Pratim Bora; Tarkeshwar Kumar; Gopinath Halder


Clean-soil Air Water | 2016

Fluoride sorption onto a steam activated biochar derived from Cocos nucifera shell

Gopinath Halder; Anoar Ali Khan; Sumit H. Dhawane


Energy Conversion and Management | 2018

Recent advancement and prospective of heterogeneous carbonaceous catalysts in chemical and enzymatic transformation of biodiesel

Sumit H. Dhawane; Tarkeshwar Kumar; Gopinath Halder


Journal of environmental chemical engineering | 2018

Optimization of biodiesel production from castor oil by Taguchi design

Bisheswar Karmakar; Sumit H. Dhawane; Gopinath Halder

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Gopinath Halder

National Institute of Technology

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Akash Pratim Bora

National Institute of Technology

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Anoar Ali Khan

National Institute of Technology

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Bisheswar Karmakar

National Institute of Technology

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Ajay Tripathi

National Institute of Technology

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Amit Ganguly

Central Mechanical Engineering Research Institute

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Debaprasad Dutta

National Institute of Technology

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Kankana Sinha

National Institute of Technology

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Kiran Singh

National Institute of Technology

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