300 research outputs found
A simple wet-chemical synthesis, reaction mechanism, and charge storage application of cobalt oxide electrodes of different morphologies
No full textAbstract not availableP.S. Gaikar, S.T. Navale, V.V. Jadhav, P.V. Shinde, D.P. Dubal, P.R. Arjunwadkar,
F.J. Stadler, Mu. Naushad, Ayman A. Ghfar, Rajaram S. Man
Green Materials for Wastewater Treatment
No full textInternational audienceThis book reviews health hazards associated with wastewater use and water pollutants. Chapters present applications of green materials made of agricultural waste, activated carbon and magnetic materials for wastewater treatment. The removal of toxic metals using algal biomass and the removal of toxic dyes using chitosan composite materials are also discussed. The book includes reviews on the removal of phenols, pesticides, and on the use of ionic liquid-modified activated carbon for the treatment of textile wastewater
Photosensitization of ZnO nanowire-based electrodes using one-step hydrothermally synthesized CdSe/CdS (core/shell) sensitizer
No full textOne-step assembled CdSe/CdS (core/shell) quantum dots (QDs) were deposited onto ZnO nanowires (NWs) and characterized for their structure, morphology and optical analyses. As deposited ZnO NWs array were wurtzite in structure. During a single hydrothermal cycle a layer of ~4nm CdSe/CdS QDs was formed onto ZnO NWs and overgrowth evidenced with an additional 2-5 layers due to which, (a) absorbance density, and (b) Raman Shift of 1LO mode (from 286cm-1 to 296cm-1) increased and (c) the photoluminescence intensity of the near band-edge emission peak at ~379nm decreased. Due to more accumulation of CdSe/CdS, photoelectrochemical cells of ZnO-based photoelectrodes designed for 1-4 cycles of CdSe/CdS onto indium-tin-oxide substrate demonstrated increasing power conversion efficiency trend from 0.18% to 1.29% whereas, for 5th cycle power conversion efficiency, due to an increased series resistance, decreased to 1.12% on account of an accumulation of several QDs
Recent Developments in Adsorption of Dyes Using Graphene Based Nanomaterials
No full textDyes are frequently let out into the environment along with wastewater
sans necessary treatment. Fast, cost-effective, scientific and suitable elimination of
dyes from wastewaters has been an important problem for researchers. Adsorption
technique is a robust, well studied, widely employed and promising water treatment
method. In the last decade, nanocarbon based adsorbents have gained attention in
water treatment. These adsorbents are usually produced from low cost substrate and
are found to be highly efficient than other adsorbents. Recently, graphene based
nanomaterials are widely used as adsorbents to sorb various toxic organic contaminants
from aqueous solutions. It showed high efficiency due to its chemical
stability, structure, surface area and surface functional groups. So graphene are
called as ‘miracle material’. Recently nanographene composites are proven to be a
likely adsorbent for eliminating contaminants from the industrial effluents. In this
chapter, we have presented briefly the synthesis of graphene and its other variants
viz., GO, rGO and nano graphene composites. This chapter presents a small
introduction to adsorption principles and adsorption isotherms. It explains the
synthesis and use of nano graphene materials for the remediation of dyes. It also
consolidates the recent literature available for dye adsorption using graphene
materials and its mechanism
Green Methods for Wastewater Treatment
No full textInternational audienceThis book presents comprehensive chapters on the latest research and applications in wastewater treatment using green technologies. Topics include mesoporous materials, TiO2 nanocomposites and magnetic nanoparticles, the role of catalysts, treatment methods such as photo-Fenton, photocatalysis, electrochemistry and adsorption, and anti-bacterial solutions. This book will be useful for chemical engineers, environmental scientists, analytical chemists, materials scientists and researchers
Green Photocatalysts
No full textInternational audienceThis book presents advanced photocatalytic technologies for wastewater treatment. The fabrication, surface modification, roles and mechanisms of green catalysts are detailed. The catalysts include nanostructured catalysts, semiconductors, metal and non-metal doped catalysts, surface plasmon materials, graphene oxide-based materials, polymer-based composite materials, heterogenous type I and type II catalysts
Graphitic Carbon Nitride–Nickel Catalyst: From Material Characterization to Efficient Ethanol Electrooxidation
No full textGraphitic carbon nitride (gCN(H)) is a semiconductor with high mechanical and thermal stability which provides good dispersion of metal particles. As it is resistant to corrosion, it constitutes an alternative to carbon black as a catalyst support in polymer electrolyte membrane fuel cells (PEMFCs), e.g., in alcohol oxidation reactions. In this research work, gCN (H)-supported catalyst has been characterized by spectroscopic (UV-vis, IR, Raman) and microscopy techniques (SEM, TEM, AFM) in order to gain deeper understanding of the relationship between material properties and electrochemical activity. Ni-doped graphitic carbon nitride (Ni/gCN(H)) was tested in electrooxidation of ethanol demonstrating comparatively high peak current density and interesting photocatalytic properties. The obtained results suggest that the improvement of the activity and selectivity of Ni-modified gCN(H) can be related to the chemical and electronic material modification, while the sample morphology and topology is preserved. Metal-support interactions account for the high photocatalytic activity, superior to that of the Pt counterpart
- …
