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Article: Electrochemical aspects of coinage metal nanoparticles for catalysis and spectroscopy

Roy, Deblina / Pal, Anjali / Pal, Tarasankar

RSC advances. 2022 Apr. 21, v. 12, no. 19

2022

Abstract: Down scaling bulk materials can cause colloidal systems to evolve into microscopically dispersed insoluble particles. Herein, we describe the interesting applications of coinage metal nanoparticles (MNPs) as colloid dispersions especially gold and silver. ...

Abstract	Down scaling bulk materials can cause colloidal systems to evolve into microscopically dispersed insoluble particles. Herein, we describe the interesting applications of coinage metal nanoparticles (MNPs) as colloid dispersions especially gold and silver. The rich plasmon bands of gold and silver in the visible range are elaborated using the plasmon resonance and redox potential values of grown metal microelectrode (GME). The gradation of their standard reduction potential values (E⁰), as evaluated from the Gibbs free energy change for bulk metal, is ascribed to the variation in their size. Also, the effect of nucleophiles in the electrolytic cell with metal nanoparticles (MNPs) is described. The nucleophile-guided reduction potential value is considered, which is applicable even for bulk noble metals. Typically, a low value (as low as E⁰ = +0.40 V) causes the oxidation of metals at the O₂ (air)/H₂O interface. Under this condition, the oxidation of noble metal particles and dissolution of the noble metal in water are demonstrated. Thus, metal dissolution as a function of the size of metal nanoparticles becomes eventful and demonstrable with the addition of a surfactant to the solution. Interestingly, the reversal of the nobility of gold (Au) and silver (Ag) microelectrodes at the water/electrode interface is confirmed from the evolution of normal and inverted ‘core–shell’ structures, exploiting visible spectrophotometry and surface-enhanced Raman scattering (SERS) analysis. Subsequently, the effect of the size, shape, and facet- and support-selective catalysis of gold nanoparticles (NPs) and the effect of incident photons on current conversion without an applied potential are briefly discussed. Finally, the synergistic effect of the emissive behaviour of gold and silver clusters is productively exploited.
Keywords	Gibbs free energy ; Lewis bases ; air ; catalytic activity ; electrochemistry ; gold ; microelectrodes ; nanogold ; oxidation ; redox potential ; surfactants ; synergism
Language	English
Dates of publication	2022-0421
Size	p. 12116-12135.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/d2ra00403h
Database	NAL-Catalogue (AGRICOLA)

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Article: Comparative assessment of factors affecting anxiety levels among adults attending online meditation sessions during the COVID-19 pandemic: A cross-sectional study.

Pal, Anjali / Panigrahi, Sunil Kumar / Majumdar, Sagarika

Journal of education and health promotion

2022 Volume 11, Page(s) 84

Abstract: Background: The ongoing coronavirus disease 2019 (COVID-19) pandemic induced the governments around the world to impose harsher preventive measures like stay at home order, lock down etc., to contain the spread of infection. This measure increased the ... ...

Abstract	Background: The ongoing coronavirus disease 2019 (COVID-19) pandemic induced the governments around the world to impose harsher preventive measures like stay at home order, lock down etc., to contain the spread of infection. This measure increased the stress of the general population through isolation of masses, loss of employment, and loss of recreation. There is a dearth of quality data showing anxiety levels among the population and association of novel nonpharmaceutical measures such as online meditation with it. Materials and methods: The study is a cross-sectional comparative study based on an online survey. The study population included 74 adult participants, out of which 30, included in the study group were attending structured online meditation sessions and 44 of the participants as a comparison group after matching age, gender, location of residence, and socioeconomic status. The data was collected using self-administered questionnaire. Multiple logistic regression was applied to ascertain factors contributing to the anxiety levels of the participants. Results: Both the groups of participants were comparable in terms of their demographic characteristics. The mean generalized anxiety disorder (GAD 7) score among the participants of online meditation program was significantly lower as compared to those not attending any online meditation. 6.7% of the participants of online meditation had GAD 7 score more than 10 as compared to 13.6% among the comparison group ( Conclusion: "At home" mental health promotion measures such as structured online meditation can serve an important role in mitigating the mental health impact of COVID-19 pandemic on the community. Further researches are needed to assess the feasibility and effectiveness of such measures.
Language	English
Publishing date	2022-03-23
Publishing country	India
Document type	Journal Article
ZDB-ID	2715449-X
ISSN	2319-6440 ; 2277-9531
ISSN (online)	2319-6440
ISSN	2277-9531
DOI	10.4103/jehp.jehp_398_21
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Article ; Online: A Review of the Latest Advances in Nanoparticle-Mediated Processes for Hexavalent Chromium Remediation from Water Bodies.

Biswas, Subhadeep / Danish, Mohammad / Pal, Anjali

Recent patents on nanotechnology

2022 Volume 17, Issue 4, Page(s) 327–339

Abstract: Hexavalent chromium (Cr(VI)) is a well-known carcinogen, and hence its removal from aqueous media is an important area of research in the field of environmental engineering. Adsorptive removal and catalytic reduction are the two most common techniques ... ...

Abstract	Hexavalent chromium (Cr(VI)) is a well-known carcinogen, and hence its removal from aqueous media is an important area of research in the field of environmental engineering. Adsorptive removal and catalytic reduction are the two most common techniques applied for this purpose. In this regard, nanoparticle-mediated technology has contributed significantly. In the current review article, a systematic investigation has been carried out to find the latest developments that took place in the domain of Cr(VI) removal by nanotechnology. The major portion deals with the advancement and application of the new-age materials, such as carbon nanotubes (CNTs), g-C
Language	English
Publishing date	2022-03-14
Publishing country	United Arab Emirates
Document type	Journal Article
ISSN	2212-4020
ISSN (online)	2212-4020
DOI	10.2174/1872210516666220314153635
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Electrochemical aspects of coinage metal nanoparticles for catalysis and spectroscopy.

Roy, Deblina / Pal, Anjali / Pal, Tarasankar

RSC advances

2022 Volume 12, Issue 19, Page(s) 12116–12135

Abstract	Down scaling bulk materials can cause colloidal systems to evolve into microscopically dispersed insoluble particles. Herein, we describe the interesting applications of coinage metal nanoparticles (MNPs) as colloid dispersions especially gold and silver. The rich plasmon bands of gold and silver in the visible range are elaborated using the plasmon resonance and redox potential values of grown metal microelectrode (GME). The gradation of their standard reduction potential values (
Language	English
Publishing date	2022-04-21
Publishing country	England
Document type	Journal Article ; Review
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d2ra00403h
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: A comprehensive review on BPA degradation by heterogeneous Fenton-like processes.

Nath, Ankurita / Biswas, Subhadeep / Pal, Anjali

Water science and technology : a journal of the International Association on Water Pollution Research

2022 Volume 86, Issue 4, Page(s) 714–745

Abstract: Synthetic organic pollutants emanating continuously in the ecosystem have become a global concern because of their toxicity and persistent nature. Bisphenol A (BPA) is one such pollutant which threatens public health and safety. It is a monomer used in ... ...

Abstract	Synthetic organic pollutants emanating continuously in the ecosystem have become a global concern because of their toxicity and persistent nature. Bisphenol A (BPA) is one such pollutant which threatens public health and safety. It is a monomer used in manufacturing plastics, polycarbonate resins, epoxy resins and is a well-recognised endocrine disruptor mimicking estrogen. BPA leaches into food and beverages stored in containers causing contamination issues. Its widespread exposure and potential toxicity is an environmental health concern. In this review, a systematic investigation has been carried out on the heterogeneous catalysts used for Fenton-like processes for BPA degradation. The Fenton-like reaction is one such reaction that is used for wastewater remediation purposes. The reaction advances through the generation of powerful oxidizing radicals like •OH and SO
MeSH term(s)	Benzhydryl Compounds/analysis ; Ecosystem ; Endocrine Disruptors/analysis ; Environmental Pollutants ; Plastics ; Water Pollutants, Chemical/analysis
Chemical Substances	Benzhydryl Compounds ; Endocrine Disruptors ; Environmental Pollutants ; Plastics ; Water Pollutants, Chemical
Language	English
Publishing date	2022-08-29
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	764273-8
ISSN	1996-9732 ; 0273-1223
ISSN (online)	1996-9732
ISSN	0273-1223
DOI	10.2166/wst.2022.219
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Article ; Online: Spectrophotometric determination of cationic surfactants in aqueous media using chrome azurol S as colour forming agent and 1-butanol as extracting solvent

Biswas, Subhadeep / Pal, Anjali

Talanta. 2020 Jan. 01, v. 206, p. 120238

2020 , Page(s) 120238

Abstract: A simple spectrophotometric method for the determination of cationic surfactants (CS) is developed using an anionic dye, chrome azurol S (CAS) as an ion-association complex forming agent, and 1-butanol as an extracting solvent. In the aqueous solution CS ...

Abstract	A simple spectrophotometric method for the determination of cationic surfactants (CS) is developed using an anionic dye, chrome azurol S (CAS) as an ion-association complex forming agent, and 1-butanol as an extracting solvent. In the aqueous solution CS such as cetyltrimethylammonium bromide (CTAB), cetylpyridinium chloride (CPC) and dodecyltrimethylammonium bromide (DTAB) reacts with CAS to form an ion-association complex which is extracted into 1-butanol to form a pink-violet coloured organic phase. The final concentration of CAS in surfactant solution is 165 μM. The pH of the medium is maintained at ~6.4. The coloured compound exhibits maximum absorbance at 520 nm with a molar absorption coefficient in the range of (2.6–2.9) × 104 L mol−1 cm−1. Beer's law is obeyed in the concentration range of 0–82 μM, 0–88 μM and 0–84 μM for CTAB, CPC and DTAB, respectively in normal condition. However, to minimize the interference of cations, the masking with EDTA has been proposed. In case of CTAB determination in EDTA masked double distilled water, the linear dynamic range (LDR) is found as 27–55 μM. The proposed method is rapid, user-friendly and economical. The method is applied in mixed CS systems, and it showed good results. To check the reliability of the method, it has been applied for CS determination in real water samples masked with EDTA and spiked with CS of known concentration. The results obtained for recovery are quite satisfactory.
Keywords	Chrome azurol S ; Cationic surfactant ; Ion-association complex ; 1-Butanol ; Spectrophotometric method
Language	English
Dates of publication	2020-0101
Size	p. 120238
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	1500969-5
ISSN	1873-3573 ; 0039-9140
ISSN (online)	1873-3573
ISSN	0039-9140
DOI	10.1016/j.talanta.2019.120238
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Article: Novel 2D/2D g-C3N4/Bi4NbO8Cl nano-composite for enhanced photocatalytic degradation of oxytetracycline under visible LED light irradiation

Majumdar, Ankush / Ghosh, Utpal / Pal, Anjali

Journal of colloid and interface science. 2021 Feb. 15, v. 584

2021

Abstract: A novel visible-light-responsive 2D/2D g-C₃N₄/Bi₄NbO₈Cl nano-composite photocatalyst was hydrothermally synthesized using g-C₃N₄ and Bi₄NbO₈Cl. Various characterization techniques were employed to characterize the as-synthesized g-C₃N₄/Bi₄NbO₈Cl nano- ... ...

Abstract	A novel visible-light-responsive 2D/2D g-C₃N₄/Bi₄NbO₈Cl nano-composite photocatalyst was hydrothermally synthesized using g-C₃N₄ and Bi₄NbO₈Cl. Various characterization techniques were employed to characterize the as-synthesized g-C₃N₄/Bi₄NbO₈Cl nano-composites. The photocatalytic efficiency of the nano-composite materials was assessed by the degradation of an emerging pharmaceutical pollutant, oxytetracycline (OTC), under visible LED light irradiation. It was observed that at an optimum mass ratio of 20% (g-C₃N₄ to Bi₄NbO₈Cl), the 20g-C₃N₄/Bi₄NbO₈Cl nano-composite produced the highest photocatalytic degradation efficiency toward OTC. The photocatalytic degradation of OTC (20 mgL⁻¹) by 20g-C₃N₄/Bi₄NbO₈Cl (1 gL⁻¹), under 60 min of visible LED light irradiation was 87%, which was about 1.2 and 1.8 times higher as compared to that of pure Bi₄NbO₈Cl and g-C₃N₄, respectively. This improved performance was associated with the formation of type-II heterojunction, which resulted in better visible-light absorption and reduced recombination of photogenerated electron-hole pairs. Moreover, it was observed that after four cycles of degradation experiments, the nano-composite was stable. The results of this work not only demonstrate the construction of 2D/2D g-C₃N₄/Bi₄NbO₈Cl nano-composite for successful low-cost and energy-efficient photocatalytic degradation of recalcitrant pollutant but also motivate the production of similar photocatalysts targeting environmental remediation.
Keywords	absorption ; energy efficiency ; irradiation ; light ; nanocomposites ; oxytetracycline ; photocatalysis ; photocatalysts ; pollutants ; remediation
Language	English
Dates of publication	2021-0215
Size	p. 320-331.
Publishing place	Elsevier Inc.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2020.09.101
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Article: Vast gap in iodization from production to plate - Hurdles in achieving Universal Salt iodization in India.

Krishna, Ekta / Pal, Anjali / Khobragade, Ashish / Panigrahi, Sunil Kumar

Journal of family medicine and primary care

2022 Volume 11, Issue 3, Page(s) 847–851

Abstract: Iodine deficiency is the most prevalent micronutrient deficiency in India and is one of the most important causes of preventable brain damage. Iodine deficiency disorders affect an individual's ability to work efficiently, which directly impacts the ... ...

Abstract	Iodine deficiency is the most prevalent micronutrient deficiency in India and is one of the most important causes of preventable brain damage. Iodine deficiency disorders affect an individual's ability to work efficiently, which directly impacts the overall development and economic productivity of any nation. Global experiences have shown that salt fortification is the most effective way to control and reduce the burden of IDD in the community. Thirty-six years have passed since the declaration of universal salt iodization (USI) implementation in India by the Central Council of Health in 1983. However, iodine deficiency still remains a public health problem in the whole country.
Language	English
Publishing date	2022-03-10
Publishing country	India
Document type	Journal Article ; Review
ZDB-ID	2735275-4
ISSN	2278-7135 ; 2249-4863
ISSN (online)	2278-7135
ISSN	2249-4863
DOI	10.4103/jfmpc.jfmpc_999_21
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Article ; Online: Spectrophotometric determination of cationic surfactants in aqueous media using chrome azurol S as colour forming agent and 1-butanol as extracting solvent.

Biswas, Subhadeep / Pal, Anjali

Talanta

2019 Volume 206, Page(s) 120238

Abstract	A simple spectrophotometric method for the determination of cationic surfactants (CS) is developed using an anionic dye, chrome azurol S (CAS) as an ion-association complex forming agent, and 1-butanol as an extracting solvent. In the aqueous solution CS such as cetyltrimethylammonium bromide (CTAB), cetylpyridinium chloride (CPC) and dodecyltrimethylammonium bromide (DTAB) reacts with CAS to form an ion-association complex which is extracted into 1-butanol to form a pink-violet coloured organic phase. The final concentration of CAS in surfactant solution is 165 μM. The pH of the medium is maintained at ~6.4. The coloured compound exhibits maximum absorbance at 520 nm with a molar absorption coefficient in the range of (2.6-2.9) × 10
Language	English
Publishing date	2019-08-09
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1500969-5
ISSN	1873-3573 ; 0039-9140
ISSN (online)	1873-3573
ISSN	0039-9140
DOI	10.1016/j.talanta.2019.120238
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Article ; Online: Treatment of real wastewater: Kinetic and thermodynamic aspects of cadmium adsorption onto surfactant-modified chitosan beads.

Pal, Preeti / Pal, Anjali

International journal of biological macromolecules

2019 Volume 131, Page(s) 1092–1100

Abstract: Chitosan (CS) beads of d̅=3.7 ± 0.32 mm diameter containing 97-98% water content were prepared and modified using sodium dodecyl sulfate (SDS) in such a way to form surfactant bilayers on CS beads surface to fabricate surfactant-modified chitosan (SMCS) ... ...

Abstract	Chitosan (CS) beads of d̅=3.7 ± 0.32 mm diameter containing 97-98% water content were prepared and modified using sodium dodecyl sulfate (SDS) in such a way to form surfactant bilayers on CS beads surface to fabricate surfactant-modified chitosan (SMCS) beads. The characterization of adsorbents was carried out by advanced analytical tools. Adsorption isotherms over a particular range of Cd
MeSH term(s)	Adsorption ; Cadmium/chemistry ; Chitosan/chemistry ; Diffusion ; Kinetics ; Surface-Active Agents/chemistry ; Temperature ; Thermodynamics ; Waste Water/chemistry ; Water Pollutants, Chemical ; Water Purification/methods ; Workflow
Chemical Substances	Surface-Active Agents ; Waste Water ; Water Pollutants, Chemical ; Cadmium (00BH33GNGH) ; Chitosan (9012-76-4)
Language	English
Publishing date	2019-03-23
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	282732-3
ISSN	1879-0003 ; 0141-8130
ISSN (online)	1879-0003
ISSN	0141-8130
DOI	10.1016/j.ijbiomac.2019.03.121
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