D. Manas - Academia.edu (original) (raw)

Papers by D. Manas

Chemistry

The present work reported a novel strategy to construct supported cationic-polystyrene-resin-boun... more The present work reported a novel strategy to construct supported cationic-polystyrene-resin-bound silver nanocomposites for enhanced catalytic reduction of 4-nitrophenol in an aqueous medium. The Fourier transform infrared spectroscopy (FTIR) was used as a model instrument for the study of catalytic reduction of 4-nitrophenol using cationic-polystyrene-resin-bound silver nanocomposite materials. The mechanism is based on the reduction of 4-nitrophenol to 4-aminophenol due to the electron transfer process that occurred between donor borohydride (BH4−) and acceptor 4-nitrophenol. The polystyrene resin provides support and surface area to increase the catalytic activity of silver nanoparticles. The diffused reflectance-Fourier transform infrared spectroscopy revealed the binding of silver particles onto the surface of cationic polystyrene resin beads. Furthermore, the catalyst was easily separated by the filtration and drying process and was able to reuse. A quantitative analysis of t...

New Journal of Chemistry, 2021

Graphical representation for determination of glutathione using citrate functionalized AgNPs enri... more Graphical representation for determination of glutathione using citrate functionalized AgNPs enriched dry-state SEIRS method.

Analytical and Bioanalytical Chemistry, 2019

A novel, facile, and low-cost method was developed for determination of cetyltrimethylammonium (C... more A novel, facile, and low-cost method was developed for determination of cetyltrimethylammonium (CTA +) cationic surfactant in water samples using diffuse reflectance Fourier transform IR (FTIR) spectroscopy and colorimetry. Cetyltrimethylammonium bromide was chosen as a model compound to demonstrate the optimization of the method for determination of CTA + in water samples. The absorption peak at 3015.96 cm-1 (for CTA +) was enhanced when gold nanoparticles were used as a chemical sensor in diffuse reflectance FTIR spectroscopy, and this absorption peak was used for determination of CTA +. Alternatively, the color change from wine red (525 nm) to blue (740 nm) and the redshift of the localized surface plasmon resonance band in the visible region were used as a sensing probe for determination of CTA +. A linear calibration curve for determination in water samples was obtained in the range from 10 to 100 ng mL-1 with a limit of detection of 3 ng mL-1 by diffuse reflectance FTIR spectroscopy and in the range from 20 to 400 ng mL-1 with a limit of detection of 7 ng mL-1 by colorimetry. The advantageous features of the methods are their simplicity, rapidity, and sensitivity for the determination of CTA + in water samples. Keywords Cetyltrimethylammonium cationic surfactant. Gold nanoparticles. Diffuse reflectance Fourier transform infrared spectroscopy and colorimetry. Water samples alkyl chain and a hydrophilic group carrying a positive charge and it exists as an ionic form (CTA +) in water [1, 2]. CTA + is widely used in detergents, hair conditioners, and textile softeners in industrial and commercial products [3]. Detergents a n d h a i r c o n d i t i o n e r s u s u a l l y c o n t a i n 0. 5-2 % cetyltrimethylammonium surfactants [4]. The factoryclaimed major ingredients of detergents and hair conditioners includes stearyl alcohol, amodimethicone, paraffin, glycerin, methylparaben, cetyl palmitate, and propylparaben in addition to CTA + [5]. CTA + is long-persisting organic chemical present in the environment, and entry of this chemical into the environment in river water, sewage, groundwater, and pond water causes water pollution. The ingestion of CTA + through drinking water may cause nausea, diarrhea, vomiting, dermal necrosis, lung complications, hypotension, and corneal damage [6, 7]. Therefore, the monitoring of CTA + present in environmental water samples will be helpful to find the entry route of this pollutant in different surface and underground water reservoirs. The methods most commonly used for the determination of CTA + in environmental, cosmetic, and pharmaceutical Electronic supplementary material The online version of this article (

Journal of Surfactants and Detergents, 2018

We report a novel methyl orange paired microextraction (MOP-ME) and diffuse reflectance-Fourier t... more We report a novel methyl orange paired microextraction (MOP-ME) and diffuse reflectance-Fourier transform infrared (DRS-FTIR) spectral monitoring for improved signal strength of total mixed cationic surfactants (CS +) for its quantification in real water samples. To the best of our knowledge, this is the first report that describes the rapid quantitative determination of total mixed CS + using MOP-ME/DRS-FTIR. The method is based on separation and preconcentration of CS + using chloroform as the extracting solvent by the formation of ion-pair complex with anionic methyl orange (MO −) followed by DRS-FTIR analysis. The intense vibration peak obtained at 2919 cm −1 in the FTIR spectra was used for the optimization of all analytical parameters and for the determination of mixed CS +. The best extraction efficiency of CS + from the aqueous solution was obtained at pH 4.0 when extracted for 3 min in chloroform at a stirring rate of 250 rpm. The linearity range obtained for the determination of total mixed CS + in water sample was 0.150-300 μg L −1 with the limit of detection and limit of quantification as 0.05 and 0.150 μg L −1 , respectively. The good recovery percentage (97.1-109.5%) from wastewater showed that the method is very selective for the determination of total CS + in complex sample matrices. The advantages of the MOP-ME/DRS-FTIR method are its simplicity, selectivity, and sensitivity toward the analysis of total mixed CS + in wastewater samples.

Atmospheric Pollution Research, 2018

Size-segregated aerosol samples collected from a rural site (Rajim: 20˚59´N and 81˚55´E) in easte... more Size-segregated aerosol samples collected from a rural site (Rajim: 20˚59´N and 81˚55´E) in eastern central India during the winter of 2011 were analyzed for anhydrosugars, sugar alcohols and primary sugars to better understand their potential sources and formation. Anhydrosugars showed the predominance of levoglucosan, whereas sugar alcohol showed the predominance of mannitol, with glucose as a major primary sugar in the sub-micron (D a < 1.1µm) and supermicron mode (D a > 1.1µm). Levoglucosan gave a bimodal size distribution pattern with a major peak at 0.43-0.65 µm in the sub-micron mode during period 2 and period 3, suggesting its origin from biomass burning, whereas during period 1 the major peak was found at 4.4-5.8 µm in supermicron mode that may be due to the mixing of biomass burning derived particles with soil dust particles. Sugar alcohols (arabitol and mannitol) and primary sugars (glucose and trehalose) showed bimodal size distribution trend with a major peak at 4.4-5.8 µm in super-micron mode during all periods, perhaps due to fungal activity and soil dust re-suspension, respectively. The potential ingress of biomass burning derived particles into the lungs was calculated to be high whereas fungal spores and soil particles were more likely found in the upper respiratory tract. Principal component analysis and correlation analysis showed that biomass burning was a major source in the sub-micron mode whereas fungal spores and vegetative soil were dominant sources for quantified sugars in super-micron mode.

Journal of Geophysical Research: Atmospheres, 2017

The sources and formation processes of dicarboxylic acids are still under investigation. Size-seg... more The sources and formation processes of dicarboxylic acids are still under investigation. Size-segregated aerosol (9-sizes) samples collected in the urban site (Raipur: 21.2°N and 82.3°E) in eastern central India during summer of 2013 were measured for water-soluble diacids (C 2-C 12), ω-oxoacids (ωC 2-ωC 9), -dicarbonyls (C 2-C 3), and inorganic ions to better understand their sources and formation processes. Diacids showed the predominance of oxalic acid (C 2), whereas ω-oxoacids showed the predominance of glyoxylic acid (ωC 2), and glyoxal (Gly) was a major -dicarbonyl in all the sizes. Diacids, ω-oxoacids, and -dicarbonyls as well as SO 4 2-, NO 3-, and NH 4 + were enriched in coarse mode, where Ca 2+ peaked, suggesting that they are preferentially produced in coarse mode via adsorption as well as heterogeneous and aqueous-phase oxidation reaction of precursors on the surface of water-soluble mineral dust particles having more alkaline species. Strong correlations of diacids and related compounds with NO 3-(r = 0.66-0.91) and aerosol water content (AWC) (r = 0.63-0.93) further suggest an importance of heterogeneous and aqueous-phase production in coarse mode. We found strong correlations of C 2 /(C 2-C 12), C 2 /ωC 2 , and C 2 /Gly ratios with AWC in coarse mode (r = 0.83, 0.86, and 0.85, respectively), indicating that enhanced AWC is favorable for the production of C 2 diacid through aqueous-phase oxidation of its higher homologous diacids, ωC 2 , and Gly. These results demonstrates unique reactivity of watersoluble mineral dust particles for the enhanced production of diacids and related compounds in aqueous-phase, having implications on the aerosol-cloud interaction, solubility, and hygroscopicity of a dominant fraction of water-soluble organic aerosol mass. [250]

Environmental Monitoring and Assessment, 2000

The dust fall-out rate, distribution pattern andconcentration of lead in the particulate fall-out... more The dust fall-out rate, distribution pattern andconcentration of lead in the particulate fall-outmatters in urban Raipur city covering an area of 160 km2 during one hydrological year i.e. November1996–June 1997, has been described. The entire cityhas been divided into 6 zones comprising ofindustrial, commercial, residential and heavy trafficareas. A monthly collection and analysis of dustfall-out rate between 3.0(±0.1) and91.3(±1.2) metric

Bulletin of Environmental Contamination and Toxicology, 2014

The removal of phenolic compounds, i.e., o-cresol, m-cresol, and p-cresol from aqueous solution h... more The removal of phenolic compounds, i.e., o-cresol, m-cresol, and p-cresol from aqueous solution have been evaluated employing activated carbon (AC) coated with polymer supported iron nanoparticles (FeNPs). The synthesized FeNPs were characterized by scanning electron microscope and X-ray diffraction analysis. High correlation coefficient values indicated that the adsorption of phenolic compounds onto AC coated with polyvinylpyrrolidon (PVP) supported FeNPs obey Freundlich and Langmuir adsorption isotherms. Higher Freundlich and Langmuir constant values for AC coated with PVP supported FeNPs indicated its greater efficiency than AC. The adsorption data are well represented by both the Freundlich and Langmuir isotherms, indicating favourable adsorption of cresols by the adsorbents. Cresols were effectively removed (90 %) by adsorption process from aqueous solution using AC coated with FeNPs. The percentage removal of above phenolic compounds was studied under varying experimental conditions such as pH, temperature, adsorbent dosage, and contact time. The adsorption of phenolic compounds is quite sensitive to pH of the suspension and optimum uptake value was found at pH 7.0. Temperature also has a favorable effect on adsorption when varied from 20 to 50°C. On the contrary, beyond 30°C, a decrease in the adsorption was noticed.

Journal of Experimental Nanoscience, 2007

... DOI: 10.1080/17458080701753744 S. Sharma a , M. Thakur a & MK Deb a * pages 251-256. Avai... more ... DOI: 10.1080/17458080701753744 S. Sharma a , M. Thakur a & MK Deb a * pages 251-256. Available online: 20 Nov 2007. ...

Journal of Atmospheric Chemistry, 2010

... Ravishankar Shukla University, Raipur 492 010 Chhattisgarh, India e-mail: debmanas@yahoo. com... more ... Ravishankar Shukla University, Raipur 492 010 Chhattisgarh, India e-mail: debmanas@yahoo. com YI Tsai Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, 60, Sec. 1, Erh-Jen Road, Jen-Te, Tainan 717, Taiwan ...

International Journal of Environmental Analytical Chemistry, 2012

ABSTRACT

Water Air and Soil Pollution, 2002

An assessment of arsenic contamination in Raipur city (21°14'N, 18°38'E) of Chhattisgar... more An assessment of arsenic contamination in Raipur city (21°14'N, 18°38'E) of Chhattisgarh in the central part of India is reported here, for a monitoring period between November 1996 to June 1997, in airborne dust particulates. The concentration level of As were higher in the industrial site, followed by heavy traffic as compared to other sites. The monthly atmospheric arsenic deposition,

Environmental Monitoring and Assessment, 2004

The geographical and temporal distribution patterns of airborne dust particulates have been studi... more The geographical and temporal distribution patterns of airborne dust particulates have been studied in different representative areas of Raipur City. Dust fall samples from different sites were collected and some selected toxic metals namely Cr,

Bulletin of Environmental Contamination and Toxicology, 2013

The effects of combustion of the fire crackers on the air quality in eastern Central India were s... more The effects of combustion of the fire crackers on the air quality in eastern Central India were studied for the first time during Diwali festival. This case study analyzes the size distribution and temporal variation of aerosols collected in the rural area of eastern Central India during pre-diwali, Diwali and post-diwali period for the year of 2011. Fifteen aerosol samples were collected during the special case study of Diwali period using Andersen sampler. The mean concentrations of PM10 (respirable particulate matter) were found to be 212.8 ± 4.2, 555.5 ± 20.2 and 284.4 ± 5.8 during pre-diwali, Diwali and post-diwali period, respectively. During Diwali festival PM10 concentration was about 2.6 and 1.9 times higher than pre-diwali and post-diwali period, respectively. PM2.5 (fine) and PM1 (submicron) concentrations during Diwali festival were more than 2 times higher than pre-diwali and post-diwali.

Air Quality, Atmosphere & Health, 2011

Size-segregated aerosol samples were collected at Raipur, India, during the period of October 200... more Size-segregated aerosol samples were collected at Raipur, India, during the period of October 2008 to September 2009, using eight-stage cascade impactor-type aerosol sampler at a flow rate of 28.3 l/min. The results give information about the mass concentrations, seasonal variations, and sources of water-soluble inorganic species viz. Na + , NH 4 + , K + , Mg 2+ , Ca 2+ , Cl-, NO 3-, and SO 4 2in both PM 2.5-10 (coarse) and PM 2.5 (fine) fractions. Annual mean of mass concentrations of PM 2.5-10 and PM 2.5 aerosols were monitored to be 200.7±55.1 and 185.9± 66.9 μg/m 3 , respectively. The annual mean concentrations of the inorganic components were monitored to be 5.4±2.4,

New Journal of Chemistry, 2019

A novel surface enhanced infra-red spectroscopy (SEIRS) method with silver nanoparticles (AgNPs) ... more A novel surface enhanced infra-red spectroscopy (SEIRS) method with silver nanoparticles (AgNPs) assisted by single drop microextraction (SDME) was developed for detection of total mixed quaternary ammonium cationic surfactants (QACS) in water samples.

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, ... more School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, India E-mail: debmanas@yahoo.com Manuscript received online 06 December 2019, accepted 26 December 2019 Size distributed aerosols are collected from October 2016 to July 2017 at eastern central India. This work for the first time investigates the possibilities of long-range transport and inhalation dose of particulate matters in different size at study site. During winter the aerosols were enriched in fine mode particles size however, they are more enriched in coarse mode during summer and post-monsoon season. Significant loading of particulate matters was observed during summer season. Crop residues are burnt in large scale which increases fine particles in the atmosphere. Strong correlation between the fine size fraction were observed in summer and winter season which must be due to the strong biomass burning. The percentage loading of upper re...

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, ... more School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, India ANC Division, National Metallurgical Laboratory (NML), Jamshedpur-843 017, Jharkhand, India E-mail : debmanas@yahoo.com A green synthesis of bimetallic [gold/silver nanoparticles (Au/ AgNPs)] has been done by microwave irradiation in the presence of reducing and stabilizing agents. Au/ AgNPs were analyzed using UV-Visible spectroscopic technique, transmission electron microscope (TEM) and X-ray diffraction (XRD). The Au/AgNPs prepared in this way were uniform. Appearance of surface plasmon band indicated the formation of NPs. Highly monodisperse stable Au/ AgNPs were obtained within few minutes of microwave irradiation. Through TEM, Au/AgNPs were observed to be spherical. Actual size of Au/ AgNPs was observed by XRD technique. The photocatalytic degradation of organic dyes (alizarin red S, bismark brown R, eosin and methyl violet) assisted by metal Au/AgNPs wer...

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, ... more School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, India E-mail : debmanas@yahoo.com Manuscript received 11 May 2007, accepted 21 May 2007 A diffuse reflectance Fourier transform Infrared spectroscopy (DRS-FTIR) was applied for the study of interaction of paraquat (1,1'-dimethyl-4,4'-bipyridylium cation), one of tbe most commonly used pesticides, with electrochemically synthesized silver nanoparticles. It is based on simple chemical treatment of paraquat with silver nanoparticles prepared by electrochemical method. The adsorption of paraquat on the surface of nanoparticles occurs resulting in particle agglomeration, which is indicated by hypsochromic shift (-30 nm) in the electronic spectra of silver nanoparticle solution. FTIR spectra of the paraquat treated with silver nanoparticles shows partial or complete disappear...

CERN European Organization for Nuclear Research - Zenodo, 2010

Nitrogen and sulfur are among the various Important macronutrleuts present in the soil which cont... more Nitrogen and sulfur are among the various Important macronutrleuts present in the soil which continuously remain in dynamic equilibrium in the soil-system while participating In essential biogeochemical processes. The levels of ammonium (NH4 +), nitrate (N03) and sulphate (SOl") also indicate soil fertility status. The approach of convenliunal aa1alytical techniques for quantitative determination of inorganic ions restricts tbelr use for large number of samples and in situ soil analysis. The objective of this study "•as to develop a fast and 11.on-destructive method for quantitative determination or Inorganic cationic and anionic species, i.e. NH 4 +, N_0 3-and sol• in soil employing diffuse rellectance Fourier transform Infrared spectroscopy (DRS-Jo'TIR) with potassium bromide (KBr) matrix as background. The basis or determination of these Ions Is the selection of non-Interfering quantitative vibrational peaks among the various observed peaks for the dliTerea1t symmetry types of the selected multi-atomic ionic units. The peaks at 3132 cm• 1 (asymmetric stretching vibration, VJ), 1385 cm• 1 (asymmetric stretching vibration, vJ) and 617 cm•l (bending vibration, v 4) were selected for quantitative determinat.lon of NH4+, No 3-and soi• respectively, due to the simple reason of slrong, sharp signals and avoiding tile Interfering peaks due to presence of other possible Ions in soil. The quunlilative analysis bas been done by preparing calibration curves by obtaining the peak areas for a wide range of concentration at selected peaks for respective Ions. The concentration of NH/, No 3 • and soi• were determined, by the present method, to be In the ranges 1.2-5.6, 16.3-23.8 and 11.4-24.3 Jlg g-1 respectively in 8 different mixed featured loam type soli samples collected randomly and freshly from the surrounding areas of the city._ The uncertainty in the determination, in terms of rei. std. dev. (rt=lO), were found to be In the range 2.16-4.82, 1.08-3.73 and 1.!17-4.12'1>, respectively for NH 4 +, NO[ and SOi"lons. The present method has relatively very high sample throughput as compared to ion-chromatographic (IC) technique. Tbe work proposes a rapid, free or Interferences, low cost and non-destructive method employing DRS-FI'IR technique for characterization of key components of soil viz. NH 4 +, No 3 • and SOi••

Chemistry

New Journal of Chemistry, 2021

Analytical and Bioanalytical Chemistry, 2019

Journal of Surfactants and Detergents, 2018

Atmospheric Pollution Research, 2018

Journal of Geophysical Research: Atmospheres, 2017

Environmental Monitoring and Assessment, 2000

Bulletin of Environmental Contamination and Toxicology, 2014

Journal of Experimental Nanoscience, 2007

Journal of Atmospheric Chemistry, 2010

International Journal of Environmental Analytical Chemistry, 2012

ABSTRACT

Water Air and Soil Pollution, 2002

Environmental Monitoring and Assessment, 2004

Bulletin of Environmental Contamination and Toxicology, 2013

Air Quality, Atmosphere & Health, 2011

New Journal of Chemistry, 2019

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, ... more School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, India ANC Division, National Metallurgical Laboratory (NML), Jamshedpur-843 017, Jharkhand, India E-mail : debmanas@yahoo.com A green synthesis of bimetallic [gold/silver nanoparticles (Au/ AgNPs)] has been done by microwave irradiation in the presence of reducing and stabilizing agents. Au/ AgNPs were analyzed using UV-Visible spectroscopic technique, transmission electron microscope (TEM) and X-ray diffraction (XRD). The Au/AgNPs prepared in this way were uniform. Appearance of surface plasmon band indicated the formation of NPs. Highly monodisperse stable Au/ AgNPs were obtained within few minutes of microwave irradiation. Through TEM, Au/AgNPs were observed to be spherical. Actual size of Au/ AgNPs was observed by XRD technique. The photocatalytic degradation of organic dyes (alizarin red S, bismark brown R, eosin and methyl violet) assisted by metal Au/AgNPs wer...

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, ... more School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, India E-mail : debmanas@yahoo.com Manuscript received 11 May 2007, accepted 21 May 2007 A diffuse reflectance Fourier transform Infrared spectroscopy (DRS-FTIR) was applied for the study of interaction of paraquat (1,1'-dimethyl-4,4'-bipyridylium cation), one of tbe most commonly used pesticides, with electrochemically synthesized silver nanoparticles. It is based on simple chemical treatment of paraquat with silver nanoparticles prepared by electrochemical method. The adsorption of paraquat on the surface of nanoparticles occurs resulting in particle agglomeration, which is indicated by hypsochromic shift (-30 nm) in the electronic spectra of silver nanoparticle solution. FTIR spectra of the paraquat treated with silver nanoparticles shows partial or complete disappear...

CERN European Organization for Nuclear Research - Zenodo, 2010