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Full-Text Articles in Chemistry
Visible Light-Induced Enhanced Photoelectrochemical And Photocatalytic Studies Of Gold Decorated Sno2 Nanostructures, Mohammad Mansoob Khan Dr, S. A. Ansari, M. E. Khan, M. O. Ansari, B. K. Min, M. H. Cho
Visible Light-Induced Enhanced Photoelectrochemical And Photocatalytic Studies Of Gold Decorated Sno2 Nanostructures, Mohammad Mansoob Khan Dr, S. A. Ansari, M. E. Khan, M. O. Ansari, B. K. Min, M. H. Cho
Dr. Mohammad Mansoob Khan
This paper reports a novel one-pot biogenic synthesis of Au–SnO2 nanocomposite using electrochemically active biofilm. The synthesis, morphology and structure of the as-synthesized Au–SnO2 nanocomposite were in-depth studied and confirmed by UV-vis spectroscopy, photoluminescence spectroscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. It was observed that the SnO2 surface was decorated homogeneously with Au nanoparticles. The photoelectrochemical behavior of the Au–SnO2 nanocomposite was examined by cyclic voltammetry, differential pulse voltammetry, electrochemical impedance spectroscopy, and linear sweep voltammetry in the dark and under visible light irradiation. Visible light-induced photoelectrochemical studies confirmed that the Au–SnO2 nanocomposite had enhanced activities compared …
Electrochemically Active Biofilm Assisted Synthesis Of Ag@Ceo2 Nanocomposites For Antimicrobial Activity, Photocatalysis And Photoelectrodes, Mohammad Mansoob Khan Dr, S. A. Ansari, J. H. Lee, M. O. Ansari, J Lee, M. H. Cho
Electrochemically Active Biofilm Assisted Synthesis Of Ag@Ceo2 Nanocomposites For Antimicrobial Activity, Photocatalysis And Photoelectrodes, Mohammad Mansoob Khan Dr, S. A. Ansari, J. H. Lee, M. O. Ansari, J Lee, M. H. Cho
Dr. Mohammad Mansoob Khan
Ag@CeO2 nanocomposites were synthesized by a biogenic and green approach using electrochemically active biofilms (EABs) as a reducing tool. The as-synthesized Ag@CeO2 nanocomposites were characterized and used in antimicrobial, visible light photocatalytic and photoelectrode studies. The Ag@CeO2 nanocomposites showed effective and efficient bactericidal activities and survival test against Escherichia coli O157:H7, and Pseudomonas aeruginosa. The as-synthesized Ag@CeO2 nanocomposites also exhibited enhanced visible light photocatalytic degradation of 4-nitrophenol and methylene blue than pure CeO2. A photocatalytic investigation showed that the Ag@CeO2 nanocomposites possessed excellent visible light photocatalytic activities compared to pure CeO2. Electrochemical impedance spectroscopy and photocurrent measurements showed that the …
Visible Light-Driven Photocatalytic And Photoelectrochemical Studies Of Ag-Sno2 Nanocomposites Synthesized Using An Electrochemically Active Biofilm, Mohammad Mansoob Khan Dr, S. A. Ansari, M. O. Ansari, J. Lee, M. H. Cho
Visible Light-Driven Photocatalytic And Photoelectrochemical Studies Of Ag-Sno2 Nanocomposites Synthesized Using An Electrochemically Active Biofilm, Mohammad Mansoob Khan Dr, S. A. Ansari, M. O. Ansari, J. Lee, M. H. Cho
Dr. Mohammad Mansoob Khan
Ag-SnO2 nanocomposites (1 mM and 3 mM) were synthesized in water at room temperature using an electrochemically active biofilm. The resulting nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, diffuse reflectance spectroscopy, photoluminescence spectroscopy and X-ray photoelectron spectroscopy. The Ag-SnO2 nanocomposites exhibited enhanced photocatalytic activity under visible light irradiation for the degradation of methyl orange, methylene blue, 4-nitrophenol and 2-chlorophenol compared with pure SnO2 nanostructures. Photoelectrochemical measurements, such as electrochemical impedance spectroscopy, linear scan voltammetry and differential pulse voltammetry in the dark and under visible light irradiation, further supported the visible light activity of the Ag-SnO2 nanocomposites. These results …
Band Gap Engineering Of Ceo2 Nanostructure Using An Electrochemically Active Biofilm For Visible Light Applications, S A. Ansari, Mohammad Mansoob Khan Dr, M. O. Ansari, J. Lee, M. H. Cho
Band Gap Engineering Of Ceo2 Nanostructure Using An Electrochemically Active Biofilm For Visible Light Applications, S A. Ansari, Mohammad Mansoob Khan Dr, M. O. Ansari, J. Lee, M. H. Cho
Dr. Mohammad Mansoob Khan
Narrowing the optical band gap of cerium oxide (CeO2) nanostructures is essential for visible light applications. This paper reports a green approach to enhance the visible light photocatalytic activity of pure CeO2 nanostructures (p-CeO2) through defect-induced band gap narrowing using an electrochemically active biofilm (EAB). X-ray diffraction, UV-visible diffuse reflectance/absorption spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, Raman spectroscopy, photoluminescence spectroscopy and high resolution transmission electron microscopy confirmed the defect-induced band gap narrowing of the CeO2 nanostructure (m-CeO2). The structural, optical, photocatalytic and photoelectrochemical properties also revealed the presence of structural defects caused by the reduction of Ce4+ to …
Production Of Bioelectricity, Bio-Hydrogen, High Value Chemicals And 3 Bioinspired Nanomaterials By Electrochemically Active Biofilms, S. Kalathil, Mohammad Mansoob Khan Dr, M. H. Cho, J. Lee
Production Of Bioelectricity, Bio-Hydrogen, High Value Chemicals And 3 Bioinspired Nanomaterials By Electrochemically Active Biofilms, S. Kalathil, Mohammad Mansoob Khan Dr, M. H. Cho, J. Lee
Dr. Mohammad Mansoob Khan
Microorganisms naturally form biofilms on solid surfaces for their mutual benefits including protection from environmental stresses caused by contaminants, nutritional depletion or imbalances. The biofilms are normally dangerous to human health due to their inherited robustness. On the other hand, a recent study suggested that electrochemically active biofilms (EABs) generated by electrically active microorganisms have properties that can be used to catalyze or control the electrochemical reactions in a range of fields, such as bioenergy production, bioremediation, chemical/biological synthesis, bio-corrosion mitigation and biosensor development. EABs have attracted considerable attraction in bioelectrochemical systems (BESs), such as microbial fuel cells and microbial …
Positively Charged Gold Nanoparticles Synthesized By Electrochemically Active Biofilm – A Biogenic Approach, Mohammad Mansoob Khan Dr, S. Kalathil, J. Lee, Moo Hwan Cho
Positively Charged Gold Nanoparticles Synthesized By Electrochemically Active Biofilm – A Biogenic Approach, Mohammad Mansoob Khan Dr, S. Kalathil, J. Lee, Moo Hwan Cho
Dr. Mohammad Mansoob Khan
Positively charged gold nanoparticles [(+) AuNPs] of 5-20 nm were synthesized by using electrochemically active biofilm (EAB) formed on a stainless steel mesh, within 30 minutes, in aqueous solution containing HAuCl4 as a precursor and sodium acetate as an electron donor. Electrochemically active bacteria present on biofilm oxidize the sodium acetate by producing electrons. Simultaneously, stainless steel also provides electrons because of the Cl− ions penetration into the stainless steel. Combined effect of both the EAB and stainless steel mesh enhances the availability of electrons for the reduction of Au3+ in the solution, which makes this synthesis efficient and fast. …
A Simple Biogenic Route To Rapid Synthesis Of Au@Tio2 Nanocomposites By Electrochemically Active Biofilms, Mohammad Mansoob Khan Dr, M. H. Cho
A Simple Biogenic Route To Rapid Synthesis Of Au@Tio2 Nanocomposites By Electrochemically Active Biofilms, Mohammad Mansoob Khan Dr, M. H. Cho
Dr. Mohammad Mansoob Khan
Deposition of gold on titanium dioxide (TiO2) nanoparticles is highly beneficial for maximizing the efficiency of many photocatalytic reactions. In this study, we have reported for the first time the use of an electrochemically active biofilm (EAB) for the synthesis of Au@TiO2 nanocomposite with sodium acetate as the electron donor. The EAB acts as an electron generator for the reduction of gold ions on the surface of TiO2 nanoparticles. It was observed that the TiO2 plays not only as a support for the gold nanoparticles but also as a storage of electrons produced by the EAB within the particles. These …