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Panthi, Gopal,Park, Soo-Jin,Chung, Hea-Jong,Park, Mira,Kim, Hak-Yong Elsevier 2017 Materials chemistry and physics Vol.189 No.-
<P><B>Abstract</B></P> <P>In the present study, Ag nanoparticles decorated Mn<SUB>2</SUB>O<SUB>3</SUB> hybrid nanofibers were fabricated by calcination of electrospun PVP/AgNO<SUB>3</SUB>/Mn(NO<SUB>3</SUB>)<SUB>2</SUB> precursor nanofibers and characterized by FESEM, EDS, XRD, TEM. It was found that the prepared hybrid nanofibers included tiny Ag nanoparticles (from several to 15 nm) distributed uniformly in the Mn<SUB>2</SUB>O<SUB>3</SUB> matrix. The investigation of bactericidal activity towards gram-positive and gram-negative bacteria showed that Ag/Mn<SUB>2</SUB>O<SUB>3</SUB> hybrid nanofibers could exhibit enhanced efficiency than that of bare Mn<SUB>2</SUB>O<SUB>3</SUB> nanofibers. Therefore, this result suggests that the as prepared Ag/Mn<SUB>2</SUB>O<SUB>3</SUB> hybrid nanofibers can be a promising nanomaterial as a good alternative for the development of new bactericides.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Good morphology Ag/Mn<SUB>2</SUB>O<SUB>3</SUB> hybrid NFs were fabricated by electrospinning. </LI> <LI> Calcination of Ag<SUP>+</SUP>/Mn<SUP>2+</SUP>/PVP NFs gave pure crystalline hybrid NFs confirmed by XRD. </LI> <LI> TEM analysis revealed the uniform distribution of Ag NPs (∼15 nm) on Mn<SUB>2</SUB>O<SUB>3</SUB> matrix. </LI> <LI> Incorporation of Ag NPs could enhance the antibacterial activity of Mn<SUB>2</SUB>O<SUB>3</SUB>. </LI> <LI> Ag/Mn<SUB>2</SUB>O<SUB>3</SUB> hybrid NFs show promising prospects as new bactericide. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Gopal Panthi,Nasser A. M. Barakat,박미라,김학용,박수진 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Effective PdS/ZnS NPs doped PVAc hybrid electrospun nanofiber mat is introduced as an efficient andreusable photocatalyst. The NPs were synthesized in situ by addition of (NH4)2S to PVAc/ZnAc/PdAcsolution. Fabrication of good morphology nanofibers containing PdS/ZnS NPs was achieved by simple,effective, low cost and high yield technology; electrospinning of PVAc/PdS/ZnS colloid. Besides theeffective photocatalytic activity, the introduced immobilization strategy of NPs is considered anacceptable methodology to solve the problems of secondary pollution of nanostructural photocatalyst. Overall, the introducedmat can be used as low cost, efficient, and reusable healthily safe photocatalyst toovercome the aforementioned problem.
Gopal Panthi,김학용,박미라,박수진 한국고분자학회 2015 Macromolecular Research Vol.23 No.2
This paper presents fabrication of polyacrylonitrile (PAN) electrospun nanofibers (NFs) reinforced withAg2CO3 nanoparticles (NPs) as highly efficient visible light photocatalyst. Preparation of the introduced NFs wasaccomplished by using simple, effective, high yield, and low cost process; electrospinning of Ag2CO3/PAN colloidal solutionat different applied electric voltages. Photocatalytic efficiency of the introduced nanofiber mats was investigatedby photodegradation of three dyes (Methyl orange, Methylene blue, and RhodamineB) under visible light irradiation. Experimental results indicated that the nanofiber mat obtained at applied electric voltage of 18 kV could showhigher performance towards the photodegradation of organic contaminants. Moreover, field emission scanning electronmicroscopy (FE-SEM) and transmission electron microscope (TEM) analysis confirmed the confinement ofAg2CO3 NPs inside polymeric NFs, which can overcome the serious problems of photocorrosion of photocatalystand secondary pollution. Overall, the introduced NFs can be used as efficient, low cost, and healthily safe visible lightdriven photocatalyst in the field of water treatment and can promote its industrial application, especially in the openwater surfaces.
Gopal Panthi,박미라,김학용,박수진 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Use of nanostructured materials in powder form for various applications might show excellent performances, however they create serious problem due to separation difficulty, loss and photocorrosion during use, and their reusability in the case of large scale processes. This review presents the research that has been focused on the fabrication of composite NFs in which nanostructured materials are encapsulated in polymeric matrix by means of simple, effective, low cost, high yield technique; electrospinning in order to overcome the afore mentioned problems. Polymer NFs not only act as supporter but also prevent the aggregation and leaching of nanostructures improving their performances.
Gopal Panthi,박수진,채수형,김태우,정혜종,Seong-Tshool Hong,박미라,김학용 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Ag3PO4/PAN composite nanofibers have been fabricated by simple and low cost electrospinningtechnique followed by surface modification of PAN nanofibers with amidoxime ( C(CN2)¼NOH) groupsto utilize as anchoring sites for Ag+ ions through coordinate bonding. Subsequently, the coordinated Ag+ions were allowed to react with PO43 ions in order to form Ag3PO4/PAN composite nanofibers. Thusobtained composites were characterized by FESEM, XRD, TEM, FTIR, XPS and UV–vis. Experimentalresults revealed that composite nanofibers prepared by reacting ( C(CN2)¼NOH) functionalized PANnanofibers with 0.02 M solutions of AgNO3 and Na2HPO4 have higher efficiency towards thephotodegradation and bactericidal activities under visible light.
Gopal Panthi,박수진,박미라,김학용 한국고분자학회 2014 Macromolecular Research Vol.22 No.8
In this study, a novel polyurethane (PU) nanofibrous mat doped with Ag-CoF NPs has been synthesized byelectrospinning technique in which the in situ reduction of Ag+ into Ag NPs was achieved by utilizing the reductionability of N,N-dimethylformamide (DMF), which played dual roles as a solvent and reducing agent. Typically, solgelconsisting of CoF/PU and AgNO3 was stirred for 3 h and electrospun. The crystalline structure and uniform distributionof Ag-CoF NPs in/on PU NFs were demonstrated by X-ray diffraction (XRD) and transmission electron microscopy(TEM), respectively. Two organic dyes, MB and RhB, were used to investigate the photocatalytic activity of the nanofibrousmat under visible light irradiation.
Panthi, Gopal,Park, Mira,Kim, Hak-Yong,Lee, Seul-Yi,Park, Soo-Jin Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-
<P><B>Abstract</B></P> <P>Heterogeneous photocatalysis involving zinc oxide (ZnO) nanofibers (NFs) has emerged as a new promising route for the cost-effective treatment of organic pollutants and the transformation of hazardous substances into benign forms. In general, it involves the development of smart approaches to reduce the harmful effects of highly toxic pollutants, which are difficult to treat. This review presents research that has been focused on the fabrication of electrospun ZnO hybrid NFs and their applications in the photodegradation of different organic pollutants that are discharged into wastewater from textile and other industrial processes. Furthermore, a short discussion on charge transfer mechanisms during photocatalytic reactions is also presented.</P> <P><B>Graphical abstract</B></P> <P>Photocatalysis: a “green” technique.</P>
Panthi, Gopal,Barakat, Nasser A.M.,Park, Mira,Kim, Hak-Yong,Park, Soo-Jin Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-
<P><B>Abstract</B></P> <P>Effective PdS/ZnS NPs doped PVAc hybrid electrospun nanofiber mat is introduced as an efficient and reusable photocatalyst. The NPs were synthesized in situ by addition of (NH<SUB>4</SUB>)<SUB>2</SUB>S to PVAc/ZnAc/PdAc solution. Fabrication of good morphology nanofibers containing PdS/ZnS NPs was achieved by simple, effective, low cost and high yield technology; electrospinning of PVAc/PdS/ZnS colloid. Besides the effective photocatalytic activity, the introduced immobilization strategy of NPs is considered an acceptable methodology to solve the problems of secondary pollution of nanostructural photocatalyst. Overall, the introduced mat can be used as low cost, efficient, and reusable healthily safe photocatalyst to overcome the aforementioned problem.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PdS/ZnS NPs are synthesized in-situ and incorporated in PVAc NFs. </LI> <LI> The immobilization strategy did not affect the photocatalytic activity of NPs. </LI> <LI> The mat can be reused and reveal the same photocatalytic efficiency. </LI> </UL> </P>
Panthi, Gopal,Ranjit, Rosa,Kim, Hak-Yong,Mulmi, Deependra Das Elsevier 2018 Optik Vol.156 No.-
<P><B>Abstract</B></P> <P>Present study reports the synthesis of Ag<SUB>3</SUB>PO<SUB>4</SUB> nano/mircoparticles by facile precipitation and colloidal synthesis approach in aqueous solution. Importantly, the presented approach does not require complicated instruments, difficult processes, and harsh conditions such as high temperature and high pressure. The obtained samples were characterized using SEM with EDS, XRD, TEM with HR-TEM and SAED, and FTIR. Their optical properties were studied using UV–vis diffusive reflectance spectra. Size dependent antibacterial activity towards Gram-positive (S. aureus) and Gram-negative (E. coli, K. pneumoniae and P. aeruginosa) bacteria. Experimental results showed that the antibacterial performances of nanoparticles obtained by mixing 0.01M of each reactant (colloidal synthesis approach) were found to be much higher than that of other formulation under identical conditions.</P>