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Sanjeev K. Sharma,Gajanan S. Ghodake,김득영,김대영,O.P. Thakur 한국물리학회 2018 Current Applied Physics Vol.18 No.4
Facile, rapid, and environmentally benign hybrid Ag-ZnO nanocomposites were synthesized by two steps from green synthesis approach at room temperature. The absence of an impurity peak in X-ray diffraction (XRD) pattern confirmed the formation of polycrystalline nanocomposite material. An additional peak (111) of Ag was detected along with ZnO crystalline wurtzite structure. The surface area electron diffraction (SAED) pattern further confirmed the crystallinity of nanocomposites. The compositional analysis of hybrid Ag-ZnO was determined by EDS-mapping and confirmed the presence of Zn, O and Ag in the composite. The room-temperature photoluminescence (PL) spectra of hybrid Ag-ZnO depict a weak ultraviolet (UV) emission at 385 nm, and the strong visible emission at ~600 nm, while increasing the Ag concentration in to ZnO matrix, the UV peak was completely disappeared and major visible peak was moved to ~500 nm indicated to the best optimal detection peak for sensors. The fluorescence spectra were measured with respect to Ag concentrations of Ag-ZnO nanocomposite at room temperature to investigate the functionality and the selectivity of nanomaterials. This work opens a notable way to fabricate Ag-ZnO nanohybrids, and makes a significant contribution to the fluorescence based sensor applications.
Sharma, Sanjeev K.,Ghodake, Gajanan S.,Kim, Deuk Young,Kim, Dae-Young,Thakur, O.P. ELSEVIER 2018 CURRENT APPLIED PHYSICS Vol.18 No.4
<P>Facile, rapid, and environmentally benign hybrid Ag-ZnO nanocomposites were synthesized by two steps from green synthesis approach at room temperature. The absence of an impurity peak in X-ray diffraction (XRD) pattern confirmed the formation of polycrystalline nanocomposite material. An additional peak (111) of Ag was detected along with ZnO crystalline wurtzite structure. The surface area electron diffraction (SAED) pattern further confirmed the crystallinity of nanocomposites. The compositional analysis of hybrid Ag-ZnO was determined by EDS-mapping and confirmed the presence of Zn, O and Ag in the composite. The room-temperature photoluminescence (PL) spectra of hybrid Ag-ZnO depict a weak ultraviolet (UV) emission at 385 nm, and the strong visible emission at similar to 600 nm, while increasing the Ag concentration in to ZnO matrix, the UV peak was completely disappeared and major visible peak was moved to similar to 500 nm indicated to the best optimal detection peak for sensors. The fluorescence spectra were measured with respect to Ag concentrations of Ag-ZnO nanocomposite at room temperature to investigate the functionality and the selectivity of nanomaterials. This work opens a notable way to fabricate Ag-ZnO nanohybrids, and makes a significant contribution to the fluorescence based sensor applications. (c) 2018 Elsevier B. V. All rights reserved.</P>
Saratale, Rijuta Ganesh,Shin, Han Seung,Ghodake, Gajanan S.,Kumar, Gopalakrishnan,Oh, Min Kyu,Saratale, Ganesh Dattatraya Elsevier 2018 Bioresource technology Vol.258 No.-
<P><B>Abstract</B></P> <P>This study focuses on development of calcium peroxide (CaO<SUB>2</SUB>) pretreatment that removes major part of lignin but retaining most of sugar components of kenaf core powder (KCP) biomass. In chemical pretreatment, usually higher loss of biomass occurs which was less during this pretreatment strategy. Supplementation of inorganic salts; manganese sulfate (MnSO<SUB>4</SUB>) and cobalt chloride (COCl<SUB>2</SUB>) in CaO<SUB>2</SUB> pretreatment resulted in maximum delignification of KCP relative to individual CaO<SUB>2</SUB> pretreatment. Maximum glucose yield (98%) and hydrolysis yield (80.5%) was achieved after enzymatic hydrolysis (30 FPU/g of KCP) under optimized conditions. Analytical results proved effective lignin removal and significant destruction of KCP with this pretreatment strategy. Finally, utilization of KCP enzymatic hydrolysates by developed strain <I>Klebsiella pneumoniae</I> KMK05 resulted in maximum 2,3-butanediol (BDO) production (10.42 g/L) and BDO titer (0.385 g/g of sugar). BDO titer achieved with KCP derived sugars were found comparable with the mixture of standard sugars which is notable.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Developed CaO<SUB>2</SUB> pretreatment & optimized various operational parameters for KCP biomass. </LI> <LI> Addition of inorganic salts improved delignification, glucose yield and total sugar recovery. </LI> <LI> Maximum BDO production (10.42 g/L) was achieved using <I>Klebsiella pneumoniae</I> KMK05. </LI> <LI> This novel pretreatment strategy abstained loss of sugar components of biomass. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
팔렘,시모가,김상연,Chinna Bathula,Gajanan S. Ghodake,이수홍 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Metal nanoparticles have always attracted attention for applied catalysis in technical fields including sensorapplications. Biogenically synthesized nanoparticles are uniquely non-toxic and possess enhancedantimicrobial activity. Eco-friendly palladium nanoparticles (PdNPs) synthesized from plant extractsand/or biopolymers have wide biomedical, environmental, and biosensor applications. The size, shape,stability, and catalytic behavior of PdNPs are influenced by factors such as pH, temperature, concentrationof metallic salt, and concentration of plant extract/biopolymer solutions. This review article focuseson the comprehensive synthesis of biogenic PdNPs from phytochemicals/biopolymers and conciselyreports their heterogeneous organic catalytic applications. Furthermore, improved catalytic efficiencies,selectivities, and reaction yields of organic coupling reactions catalyzed by biogenic PdNPs are discussedin detail. This review highlights the safety, sustainability, and effective catalytic activity of biogenicPdNPs for organic coupling reactions, which ensures lesser toxic waste generation and reduces hazardouseffects on the environment.