86 research outputs found
Bio-mediated Synthesis of Nanomaterials for Packaging Applications
No full textChange in lifestyle of humans in this present generation with huge dependence on packaging materials has encouraged several studies on development of new variety of packaging materials. Emphasis on replacement of existing non-biodegradable packaging materials with biodegradable materials paved the way for the use of biopolymers. Lack of properties, such as thermal stability and mechanical strength in biopolymers led to the development of bio-polymer nano-composites by adding metal/metal oxide nanoparticles as fillers into the biopolymers. Metal/metal oxide nano-particles improve mechanical/tensile strength, thermal stability as well as antimicrobial properties of the binding and receiving polymer matrix. Bio-mediated synthesis of metal/metal oxide nanoparticles result to development of novel packaging materials at a low cost and without releasing hazardous wastes into the environments. Novel packaging materials with metal/metal oxide nanoparticles as additives are capable of increasing the shelf life of food stuffs, in certain cases they act as indicators of quality food inside the package. Summarily, this present chapter focuses on bio-mediated synthesis of various metal/metal oxide nano-particles and their applications in food packaging
Titanium dioxide–gold nanocomposite materials embedded in silicate sol–gel film catalyst for simultaneous photodegradation of hexavalent chromium and methylene blue
No full textAminosilicate sol-gel supported titanium dioxide-gold (EDAS/(TiO2-Au)nps) nanocomposite materials were synthesized by simple deposition-precipitation method and characterized. The photocatalytic oxidation and reduction activity of the EDAS/(TiO2-Au)nps film was evaluated using hexavalent chromium (Cr(VI)) and methylene blue (MB) dye under irradiation. The photocatalytic reduction of Cr(VI) to Cr(III) was studied in the presence of hole scavengers such as oxalic acid (OA) and methylene blue (MB). The photocatalytic degradation of MB was investigated in the presence and absence of Cr(VI). Presence of Aunps on the (TiO2)nps surface and its dispersion in the silicate sol-gel film (EDAS/(TiO2-Au)nps) improved the photocatalytic reduction of Cr(VI) and oxidation of MB due to the effective interfacial electron transfer from the conduction band of the TiO2 to Aunps by minimizing the charge recombination process when compared to the TiO2 and (TiO2-Au)nps in the absence of EDAS. The EDAS/(TiO2-Au)nps nanocomposite materials provided beneficial role in the environmental remediation and purification process through synergistic photocatalytic activity by an advanced oxidation-reduction processes
Turning UV Light-Active BiOF into Visible Light-Active BiOF by Forming a Heterojunction with gC3N4 and Its Photoelectrochemical Water Splitting Performance in Reverse Osmosis-Rejected Wastewater
No full textPhotoelectrochemical water splitting
over a photoelectrode is an
auspicious methodology for green hydrogen production. The intriguing
properties of graphitic carbon nitride (g-C3N4) in water splitting were studied via construction of a heterojunction
with bismuth-based (BiOX, X = F, Cl, Br, and I) oxyhalides. The g-C3N4/BiOF heterostructure materials were prepared
by adding preformed g-C3N4 via an ultrasonication
process by applying a frequency of 50 Hz and a power of 100 W for
2 h. The fabricated 6% g-C3N4/BiOF electrode
exhibited a significant photoelectrocatalytic (PEC) activity in alkaline
medium with front and back light illumination. In the case of back
light illumination, 6% g-C3N4/BiOF exhibited
a higher photocurrent density of 48.2 μA/cm2 at 1.23
V versus RHE, which is 5-fold larger than that of bare g-C3N4. The augmented charge separation and migration of the
photoelectrode were confirmed using the transient time-photocurrent
response curve and the open-circuit potential, which is consistent
with photoluminescence spectra. The higher charge carrier transfer
of 6% g-C3N4/BiOF was confirmed by electrochemical
impedance spectroscopy analysis. The heterojunction between g-C3N4 and BiOF was confirmed by FT-IR spectroscopy,
Raman spectroscopy, FESEM, and HRTEM analyses, which facilitates the
applied bias photon-to-current efficiency and significant stability
of the fabricated photoelectrode up to 7500 s. Furthermore, the PEC
water splitting performance of the 6% g-C3N4/BiOF electrode in reverse osmosis-rejected wastewater was explored.
Finally, a possible charge-transfer mechanism of the g-C3N4/BiOF heterojunction during PEC water splitting was
proposed, and this work could initiate the BiOF photocatalyst for
PEC water splitting
Rational design of solar cells for efficient solar energy conversion
No full textPreface
Solar cell technology is a potential alternative to overcome the issues related to
energy demand and environmental pollution caused by fossil fuels. Dye‐sensitized
solar cells, organic solar cells, polymer solar cells, perovskite solar cells, and
quantum dot solar cells are promising next‐generation alternative renewable
energy technology to substitute for fossil fuels and other energy sources due to
their high performance, ease of fabrication, long‐term stability, and low manufacturing
cost. This new book gathers and surveys a variety of novel ideas that
have emerged in the fields of dye‐sensitized solar cells, organic solar cells, polymer
solar cells, perovskite solar cells, and quantum dot solar cells from over
forty experts in the interdisciplinary areas of chemistry, physics, materials science,
and engineering and widely explores the materials development and
device fabrication in the field of solar cells to achieve higher solar energy conversion
efficiency. This book presents a collection of twelve chapters written by
researchers who are the leading experts in their fields of research and they
explain the strategies needed to overcome the challenges in solar cell fabrication.
The first chapter of this book is a succinct summary of the state of the art
of the fabrication of plasmonic nanoparticles incorporated into photoanodes
for dye‐sensitized solar cells. Chapters 2 and 3 focus more on the aspects of
sensitization processes with cosensitizer and natural dyes, and their impact in
dye‐sensitized solar cells. Chapters 4 and 5 explore the durability, stability, and
performance enhancement strategies needed to adapt polymer and gel electrolytes
for use in in dye‐sensitized solar cells. Chapters 6 and 7 discuss the details
of replacing the expensive platinum counterelectrode with alternative electrocatalysts
to minimize the fabrication cost of dye‐sensitized solar cells. Chapters
8–10 address the key challenges in the fabrication and possible strategies to
improve the efficiency of the polymer solar cells with different approaches.
Chapter 11 summarizes the possible methodologies to fabricate perovskite
solar cells from laboratory scale to industrial scale. Chapter 12 presents the
possible role of biomolecules and their charge transfer dynamics in quantum
dot solar cells
TiO2-Au nanocomposite materials modified photoanode with dual sensitizer for solid-state dye-sensitized solar cell
No full textAminosilicate sol-gel embedded core-shell (TiO<SUB>2</SUB>-Au)nps nanomaterials modified electrode for the electrochemical detection of nitric oxide
No full textA glassy carbon electrode modified with amine functionalized silicate sol-gel supported core-shell titanium dioxide-gold nanocomposite materials (EDAS/(TiO2-Au)nps) has been prepared and used as an electrochemical sensor for nitric oxide detection. The aminosilicate supported core-shell nanomaterials have been synthesized by the chemical reduction of HAuCl4 and deposition of the formed Aunps on TiO2- nanoparticles in the presence of N-[3-(trimethoxysilyl)propyl]-ethylene diamine as a support matrix and as a reducing agent. The so-prepared EDAS/(TiO2--Au)nps nanomaterials and the corresponding films have been characterized by spectral and electrochemical methods. A set of experimental conditions has been optimized for the fabrication of sensor electrode. The electrochemical properties of the GC/EDAS(TiO2-Au)nps modified electrode and the electrochemical detection of NO have been studied. The Osteryoung square wave voltammetric measurements reveals that the current response observed at the GC/EDAS(TiO2-Au)nps modified electrode for different concentrations of NO is linear with the lowest detection limit of 1 μ M
Nanostructured, functional, and flexible materials for energy conversion and storage systems
No full text
Aminosilicate sol-gel embedded core-shell (TiO<SUB>2</SUB>-Au)nps nanomaterials modified electrode for the electrochemical detection of nitric oxide
No full textA glassy carbon electrode modified with amine functionalized silicate sol-gel supported core-shell titanium dioxide-gold nanocomposite materials (EDAS/(TiO2-Au)nps) has been prepared and used as an electrochemical sensor for nitric oxide detection. The aminosilicate supported core-shell nanomaterials have been synthesized by the chemical reduction of HAuCl4 and deposition of the formed Aunps on TiO2- nanoparticles in the presence of N-[3-(trimethoxysilyl)propyl]-ethylene diamine as a support matrix and as a reducing agent. The so-prepared EDAS/(TiO2--Au)nps nanomaterials and the corresponding films have been characterized by spectral and electrochemical methods. A set of experimental conditions has been optimized for the fabrication of sensor electrode. The electrochemical properties of the GC/EDAS(TiO2-Au)nps modified electrode and the electrochemical detection of NO have been studied. The Osteryoung square wave voltammetric measurements reveals that the current response observed at the GC/EDAS(TiO2-Au)nps modified electrode for different concentrations of NO is linear with the lowest detection limit of 1 μ M
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