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- 저자 : Sagnik Chakraborty (검색결과 4 건)
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Sagnik Chakraborty,Anupam Mukherjee,Subhabrata Das,Naga Raju Maddela,Saima Iram,Papita Das 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.1
The natural Fly ash modified with calcium oxide has been employed to eliminate the crystal violet dyestuff from the simulated solution. Herein, the effect of different physicochemical factors like primary dye concentration, sorption contact time, the quantity of the adsorbent, temperature, along with initial simulated solution pH, evaluated for illustrating the mechanism of adsorption. Furthermore, the equilibrium study was conducted, and equilibrium models like Langmuir, Freundlich, and Dubinin- Raduskevich (D-R) were fitted to obtain analytical results to endow with more insight into the process. The results acknowledged that the Langmuir model is well apt and suggests that the adsorption mechanism happens in a monolayer on the fly ash surface. Pseudo-first order, Pseudo-second order, and the intraparticle diffusion model evaluated, and the interpretation suggests the sorption method is obeying the Pseudo-second order and intraparticle diffusion model. The ascertained negative values of Gibbs free energy affirmed the unconstrained process for all symbiotic associations, and the obtained data 78.70 kJ mol<SUP>-1</SUP> enthalpy values manifested that exothermic mechanism was governing the reaction. The above assessment confirms the application of Calcium oxide pre-treated fly ash as a cheap adsorbent to eliminate the crystal violet dyestuff from the simulated solution.
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Sagnik Chakraborty,Shamik Chowdhury,Papita Das Saha 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.11
The biosorption potential of hen feathers (HFs) to remove hazardous textile dyes, namely congo red (CR)and crystal violet (CV), from their aqueous solutions was investigated in batch and dynamic flow modes of operation. The effect of biosorption process parameters such as solution pH, initial dye concentration, temperature, feed flow rate and bed height was studied. Biosorption equilibrium data were well described by the Langmuir isotherm model. Kinetic studies at different temperatures showed that the rate of biosorption followed the pseudo second-order kinetics well. A thermodynamic study showed that biosorption of both CR and CV was spontaneous and endothermic. Breakthrough time increased with increase in bed height but decreased with increase in flow rate. The Thomas model showed good agreement with the dynamic flow experimental data. Overall, the results suggest the applicability of HFs as an efficient biosorbent for removal of carcinogenic textile dyes from aqueous media.
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Debadrata Sarkar,Sagnik Chakraborty,Aman Arora,Soumen Sen 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Physically interactive applications like tissue sampling have become essential in present day minimally invasive endoscopy/colonoscopy applications. This calls for specialized steering heads with force exertion ability, still maintaining simplified actuation mechanisms having inherent softness and steerability. This article presents development of soft hyperelastic material (silicone) based pneumatically actuated steering head with improved performance achieved through O-ring reinforcements. The design attains omnidirectional bending operations as well as extension capability enabling needle insertion by the steering head. The ring reinforcement not only contains the bulging effect but also enhances extension ability and range of bending. Additionally, it improves stiffness, structural stability and force exertion capability. The presented work implements two layer design principle - the inner actuator is made from silicone of harder shore hardness followed by a thin outer layer of softer silicone, embedding the O-rings in between. The steering head has been designed iteratively through in depth Finite Element modeling and analyses after obtaining material models of silicones experimentally. The actuator has undergone detailed characterization through simulation for its workspace and blocked-tip force capabilities at various configurations. The characteristics have been experimentally validated on the developed prototype.
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Sudhansu Sandhibigraha,Sagnik Chakraborty,Tarunkanti Bandyopadhyay,Biswanath Bhunia 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.1
Here in this work, a 4-chlorophenol (4-CP)-degrading bacterial strain Bacillus subtilis (B. subtilis) MF447840.1 was isolated from the drain outside the Hyundai car service center, Agartala, Tripura, India. 16S rDNA technique used carried out for genomic recognition of the bacterial species. Isolated bacterial strain was phylogenetically related with B. subtilis. This strain was capable of breaking down both phenol and 4-CP at the concentration of 1,000 mg/L. Also, the isolated strain can able to metabolize five diverse aromatic molecules such as 2-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol, 4-nitrophenol, and pentachlorophenol for their growth. An extensive investigation was performed to portray the kinetics of cell growth along with 4-CP degradation in the batch study utilizing 4-CP as substrate. Various unstructured models were applied to evaluate the intrinsic kinetic factors. Levenspiel’s model demonstrates a comparatively enhanced R² value (0.997) amongst every analyzed model. The data of specific growth rate (μ), saturation constant (KS), and YX/S were 0.11 h<SUP>-1</SUP>, 39.88 mg/L, along with 0.53 g/g, correspondingly. The isolated strain degrades 1,000 mg/L of 4-CP within 40 h. Therefore, B. subtilis MF447840.1 was considered a potential candidate for 4-CP degradation.
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