Adsorptive removal of nickel(II) ions from aqueous environments using gum based and clay based polyaniline/chitosan nanobiocomposite beads and microspheres: Equilibrium, kinetic, thermodynamics and ex-situ studies

Nilanjana Das,Lina Rose Varghese,Devlina Das 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.7

The present study was carried out using gum (Ga) based and clay (MMT) based nanobiocomposite beads and microspheres composed of polyaniline NPs (PANI) and chitosan (Ch) as adsorbent for the removal of Ni(II) ions from aqueous environments. Under optimized conditions maximum Ni(II) removal 98.12% was exhibited by clay based nanobiocomposite (PANI-Ch-MMT) beads followed by gum based nanobiocomposite (PANI-Ch-Ga) beads (95.02%), PANI-Ch-MMT microspheres (85.12%) and PANI-Ch-Ga microspheres (75.23%). Equilibrium studies suggested a homogeneous mode of Ni(II) adsorption. Better applicability of pseudo-first order kinetic model suggested physisorption as the underlying phenomenon. Thermodynamic studies showed that adsorption was endothermic and spontaneous. The mechanism of adsorption by PANI-Ch-MMT and PANI-Ch-Ga beads was elucidated using SEM, EDX and FT-IR analyses. Ex-situ studies showed a maximum Ni(II) removal of 80.55% from mining wastewater using PANI-Ch-MMT beads in column mode. Regeneration studies suggested that PANI-Ch-MMT beads could be consistently reused up to five cycles.

Application of novel nanobiocomposites for removal of nickel(II) from aqueous environments: Equilibrium, kinetics, thermodynamics and ex-situ studies

Nilanjana Das,Lina Rose Varghese,Devlina Das 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1

The current study presents a novel approach for the removal of Ni(II) from aqueous environments using plant gum-based (PG) and clay-based (CL) nanobiocomposite (NBC) composed of ZnO nanoparticles and chitosan. Parameters like pH, contact time, temperature, initial metal concentration and adsorbent dosage were optimized. Under optimized conditions, maximum removal of Ni(II) was noted as 90.1% and 95.5% in the case of PG-NBC and CLNBC, respectively. Equilibrium studies suggested a homogeneous mode of adsorption. Good linearity was observed for the pseudo-first order kinetic model, suggesting a physical mode of adsorption. Thermodynamic studies showed an endothermic and spontaneous nature of adsorption. The mechanism was further elucidated using SEM, EDX, AFM and FT-IR analysis. Ex-situ studies showed a maximum Ni(II) removal of 87.34% from electroplating wastewater using CL-NBC in column mode. Regeneration studies suggested that CL-NBC could be consistently reused up to 4 cycles.

An Authenticate Model of Cloud Interaction Using Cryptography

Debabrata Sarddar,Nilanjana Das,Joy Halder 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.6

Cloud Computing is one of the major trends in today’s information technology and the most likely research area. Cloud Computing is a model of sharing resources, software, information. The user access the cloud via internet and all the resources are open to all. Thus, cloud security is now a challenging problem for the cloud service providers. Cryptography is a good solution of the cloud security and several research works are published to ensure secure cloud using cryptographic tools. This paper proposes an authentic communication between a customer and cloud service provider using encryption, decryption and message digests.

Enhanced Zn(II) uptake using zinc imprinted form of novel nanobiosorbent and its application as an antimicrobial agent

Geetanjali Basak,Nilanjana Das,Devlina Das 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5

We investigated the use of zinc imprinted of novel nanobiosorbent prepared from Candida rugosa to removeZn(II) from aqueous solution. The nanobiosorbent was characterized by SEM, FTIR and XRD. Effects of various parametersincluding pH of the solution, adsorbent dosage, initial Zn(II) ion concentration and contact time on Zn(II) removalby the nanobiosorbents were investigated through batch process. Equilibrium data for Zn(II) removal was fittedto Langmuir isotherm model with an enhanced adsorption capacity of 275.48 mg/g for zinc imprinted C. rugosa nanobiosorbent,compared to nonimprinted nanobiosorbent of 172.41 mg/g. Pseudo-second-order kinetic model was bestfitted to predict the sorption kinetics for both the nanobiosorbents. AFM study revealed monolayer adsorption withthin film diffusion for Zn(II) removal. The antimicrobial activity of zinc imprinted nanobiosorbent was investigatedagainst pathogenic yeasts viz. Candida albicans and Cryptococcus neoformans using agar well diffusion method.

Environmental Microbiology and Engineering : Dual Role of Acidic Diacetate Sophorolipid as Biostabilizer for ZnO Nanoparticle Synthesis and Biofunctionalizing Agent Against Salmonella enterica and Candida albicans

( Geetanjali Basak ),( Devlina Das ),( Nilanjana Das ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.1

In the present study, a yeast species isolated from CETP, Vellore, Tamilnadu was identified as Cryptococcus sp. VITGBN2 based on molecular techniques and was found to be a potent producer of acidic diacetate sophorolipid in mineral salt media containing vegetable oil as additional carbon source. The chemical structure of the purified biosurfactant was identified as acidic diacetate sophorolipid through GC-MS analysis. This sophorolipid was used as a stabilizer for synthesis of zinc oxide nanoparticles (ZON). The formation of biofunctionalized ZON was characterized using UV?visible spectroscopy, XRD, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy. The antimicrobial activities of naked ZON and sophorolipid functionalized ZON were tested based on the diameter of inhibition zone in agar well diffusion assay, microbial growth rate determination, protein leakage analysis, and lactate dehydrogenase assay. Bacterial pathogen Salmonella enterica and fungal pathogen Candida albicans showed more sensitivity to sophorolipid biofunctionalized ZON compared with naked ZON. Among the two pathogens, S. enterica showed higher sensitivity towards sophorolipid biofunctionalized ZON. SEM analysis showed that cell damage occurred through cell elongation in the case of S. enterica, whereas cell rupture was found to occur predominantly in the case of C. albicans. This is the first report on the dual role of yeastmediated sophorolipid used as a biostabilizer for ZON synthesis as well as a novel functionalizing agent showing antimicrobial property.

An analysis of transport suitability, modal choice and trip pattern using accessibility and network approach: a study of Jamshedpur city, India

Santanu Dinda,Subrata Ghosh,Nilanjana Das Chatterjee 대한공간정보학회 2019 Spatial Information Research Vol.27 No.2

The transportation system is considered the most important element of urban infrastructure and therefore, contemporary urban research precise more emphasis on the well-managed sustainable transport system. Accessibility and connectivity are two important tools regarding urban mobility, trip generation and modal choice as well as transportation management. The assessment of transport suitability is now the central part of transport management. From these perspectives, this study has been focused on the patterns of urban mobility and modal choice on the basis of transport accessibility and suitability. The Jamshedpur city and five adjoining urban areas are selected for assessment. The GIS-based accessibility modeling and network analysis have been used in this study. Moreover, the empirical field survey has also been made for the assessment of trip generation in selected nodes. Therefore, the analytic hierarchy process (AHP) was applied to assess the nature and patterns of trip occurrences and content validity ratio (CVR) and consistency ratio (CR) were used for validation. Furthermore, transport suitability index (TSI) in the different traffic zones were measured. The result shows that Jamshedpur is the most suitable in existing transportation supply–demand system as well as sustainable transportation management.

Analyzing risk factors for shrinkage and transformation of East Kolkata Wetland, India

Subrata Ghosh,Santanu Dinda,Nilanjana Das Chatterjee,Kousik Das 대한공간정보학회 2018 Spatial Information Research Vol.26 No.6

The East Kolkata Wetland, called the ‘kidney’ of city Kolkata has now become a significant issue for its gradual loss and modification of anthropogenic activities. A socioeconomic elucidation had been used in this article through the analysis using GIS and field observation. Changes of wetland area have been determined from 1991 to 2017 with Landsat images and accuracy assessment through ground truth verification. It is seen that loss of wetland from 1991 to 2001 was 23.55% where it was 7.34% in 2011 to 2017, mainly due to the result of land transformation for aquaculture activity. Hence, three phases of degradation have been observed in this study, these are: the phase of rapid degradation, the phase of controlled degradation and phase of transforming degraded. At the same time, it’s highlighted the loophole of management actions. A multi-criteria analysis technique with the analytic hierarchy process has been applied to determine the risk factors of wetland degradation and it is seen that expansion of built-up area, encroachment of cropland, the transformation of wetland into fishing ponds are responsible for wetland degradation. In the conclusion, it highlights the approaches of land developers and real estate agents in their wetland hunting process and emergence consequences on the environment as well as conserving approaches for sustainable management.

Impact of instream sand mining on habitat destruction or transformation using coupling models of HSI and MLR

Raj Kumar Bhattacharya,Nilanjana Das Chatterjee,Kousik Das 대한공간정보학회 2020 Spatial Information Research Vol.28 No.1

Several human activities like sand mining, dam construction have intensive effect on river ecosystem. Instream sand mining is one of them to hindrance on riverine biota. Hence, an attempt is made in this study to assess three tier habitat degradation or alteration caused by instream sand mining from channel bed to riparian and bank site in upper, middle and lower segments of Kangsabati River. Habitat Suitability Index (HSI) is applied to detect geo referenced ecological information on two different condition i.e. habitat suitability of two dominating species of Koeleria macrantha and Cynodon dactylon (pre mining) and degraded or altered habitat incorporated with mining responses (post mining). HSI prepared five different suitable class taken seven dominating variables i.e. river channel, sandchar, riparian zone, slope, elevation, dry and moist sand layer using multiple logistic regressions (MLR) under GIS platform. MLR denotes sandchar deposition, elevation as significant variables of Koeleriamacrantha dominance along the bank while moist sand layer, riparian zone signified on Cynodondactylon dominance across the riparian site. HSI indicates lowsuitable class of Koeleriamacrantha and Cynodondactylon dominated in largest sand mining area as lower (82%, 86%), middle (58%, 89%) and upper segment (77%, 78%) whereas largest mining area under two dominant species reaches low-suitable class as lower (79%, 58%), middle (89%, 82%) and upper segment (92%, 70%) respectively. In spite of variables influence on species dominance, massive sand mining leads to destroy the habitat suitability. Therefore, in situ habitat suitability of dominant species either degraded or altered throughout the channel.

The spatial clustering of dengue disease and risk susceptibility mapping: an approach towards sustainable health management in Kharagpur city, India

Subrata Ghosh,Santanu Dinda,Nilanjana Das Chatterjee,Kousik Das,Riya Mahata 대한공간정보학회 2019 Spatial Information Research Vol.27 No.2

Dengue fever becomes one of the serious vectorborne diseases in the world, particularly in tropical countries. Mosquitoes borne disease transmission are mainly transpired by physical, environmental and socio-economic variables. Therefore, disease mapping is essential for monitoring, prediction, and prevention of dengue. Accordingly, the aims of this research are to find out the dengue outbreak, spatial pattern, understand the factors and construct a risk map to accurately predict and control of dengue. For this purpose, the Kharagpur city of West Bengal has been selected which is frequently encountered with the dengue outbreak. Epidemiological data were collected from the district health department. The spatial scan statistics of the Poisson model and Local Moran’s I is used for the mapping of spatial patterns and concentration of dengue and Monte Carlo hypothesis testing was applied to test the significance of the result. Therefore, multiple logistic regression analysis has been applied with selected parameters to produce a risk map for the entire study area. Finally, this study has proposed suitable site-specific management strategies. However, this study provides an example of disease risk estimation which will be remarkable for spatial analysis of epidemiological research as well as health planning and disease surveillance.

Enhanced Biodegradation of Lindane Using Oil-in-Water Bio- Microemulsion Stabilized by Biosurfactant Produced by a New Yeast Strain, Pseudozyma VITJzN01

( Jaseetha Abdul Salam ),( Nilanjana Das ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.11

Organochlorine pesticide residues continue to remain as a major environmental threat worldwide. Lindane is an organochlorine pesticide widely used as an acaricide in medicine and agriculture. In the present study, a new lindane-degrading yeast strain, Pseudozyma VITJzN01, was identified as a copious producer of glycolipid biosurfactant. The glycolipid structure and type were elucidated by FTIR, NMR spectroscopy, and GC-MS analysis. The surface activity and stability of the glycolipid was analyzed. The glycolipids, characterized as mannosylerythritol lipids (MELs), exhibited excellent surface active properties and the surface tension of water was reduced to 29 mN/m. The glycolipid was stable over a wide range of pH, temperature, and salinity, showing a very low CMC of 25 mg/l. Bio-microemulsion of olive oil-in-water (O/W) was prepared using the purified biosurfactant without addition of any synthetic cosurfactants, for lindane solubilization and enhanced degradation assay in liquid and soil slurry. The O/W bio-microemulsions enhanced the solubility of lindane up to 40-folds. Degradation of lindane (700 mg/l) by VITJzN01 in liquid medium amended with bio-microemulsions was found to be enhanced by 36% in 2 days, compared with degradation in 12 days in the absence of bio-microemulsions. Lindane-spiked soil slurry incubated with bio-microemulsions also showed 20-40% enhanced degradation compared with the treatment with glycolipids or yeast alone. This is the first report on lindane degradation by Pseudozyma sp., and application of bio-microemulsions for enhanced lindane degradation. MEL-stabilized bio-microemulsions can serve as a potential tool for enhanced remediation of diverse lindanecontaminated environments.