scholarly journals Photocatalytic Reduction of Cr(VI) in the Presence of Humic Acid Using Immobilized Ce–ZrO2 under Visible Light

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 779 ◽  
Author(s):  
Fabrício Eduardo Bortot Coelho ◽  
Victor M. Candelario ◽  
Estêvão Magno Rodrigues Araújo ◽  
Tânia Lúcia Santos Miranda ◽  
Giuliana Magnacca
Keyword(s):  
Humic Acid ◽  
Sol Gel ◽  
Cost Effective ◽  
Industrial Applications ◽  
Photocatalytic Reduction ◽  
Electron Hole ◽  
Sol Gel Process ◽  
Initial Ph ◽  
Industry Effluent ◽  
Suspended Nanoparticles

Cr(VI) has several industrial applications but it is one of the most dangerous pollutants because of its carcinogenicity and high toxicity. Thus, the removal of Cr(VI) by photocatalytic reduction was investigated. The catalyst applied, Ce–ZrO2, was immobilized, through a sol–gel process on a silicon carbide (SiC) support, to increase the efficiency and avoid using suspended nanoparticles. The influence of initial pH, humic acid (HA), and catalyst dosage was investigated for Cr(VI) containing solutions. Then, a real galvanizing industry effluent (Cr(VI) = 77 mg L-1mg.L−1, Zn = 1789 mg L−1) was treated. It was observed that Cr(VI) adsorption and photoreduction are greatly favored at low pH values. HA can decrease Cr(VI) adsorption but also acts as holes scavenger, reducing the electron–hole recombination, favoring then the photoreduction. With the immobilized Ce–ZrO2, more than 97% of Cr(VI) was removed from the diluted effluent. These results indicate the feasibility to treat Cr(VI) effluents even in the presence of other metals and natural organic matter. The developed material has great chemical and mechanical resistances and avoids the use of nanoparticles, dangerous for the environment and hard to recover. Moreover, solar light can be used to drive the process, which contributes to the development of more sustainable, cleaner, and cost-effective wastewater treatments.

A Cost-Effective Supercapacitor Material of Ultrahigh Specific Capacitances: Spinel Nickel Cobaltite Aerogels from an Epoxide-Driven Sol-Gel Process

2010 ◽  
Vol 22 (3) ◽  
pp. 347-351 ◽  
Author(s):  
Te-Yu Wei ◽  
Chun-Hung Chen ◽  
Hsing-Chi Chien ◽  
Shih-Yuan Lu ◽  
Chi-Chang Hu
Keyword(s):  
Sol Gel ◽  
Cost Effective ◽  
Nickel Cobaltite ◽  
Sol Gel Process

scholarly journals Immobilization of Bacillus licheniformis using Fe3O4@SiO2 nanoparticles for the development of bacterial bioreactor

2019 ◽  
Vol 35 (2) ◽  
pp. 854-862
Author(s):  
Ayoub Nadi ◽  
Marouane Melloul ◽  
Aicha Boukhriss ◽  
Elmostafa El-Fahime ◽  
Damien Boyer ◽  
...  
Keyword(s):  
Bacillus Licheniformis ◽  
Fe3o4 Nanoparticles ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Industrial Applications ◽  
Basic Medium ◽  
Magnetite Fe3o4 ◽  
Sol Gel Process ◽  
Co Precipitation

In the biotechnology field, nanoparticles with a strong magnetic moment can bring attractive and novel potentialities. They are detectable, manipulable, stimulable by a magnetic field and they could be applied as nano-tracers for medical imaging and nano-vectors for transporting therapeutic agents to a target. For our part, we applied Fe3O4 nanoparticles to immobilize bacteria of Moroccan strains in order to develop bacterial bioreactor. For this aim, we got through the synthesis and characterization of magnetite Fe3O4 nanoparticles by co-precipitation in basic medium. The obtained nanoparticles were encapsulated in silica by sol-gel process. The results of this step allowed us to use Fe3O4@SiO2 nanoparticles to immobilize Bacillus licheniformis by adsorption and separate it magnetically. The principle of this system gives us the opportunity to develop a bacterial bioreactor for industrial applications.

Spectroscopic and electrical properties of SiO2 films prepared by simple and cost effective sol–gel process

2011 ◽  
Vol 78 (2) ◽  
pp. 695-699 ◽  
Author(s):  
M. Vishwas ◽  
K. Narasimha Rao ◽  
A.R. Phani ◽  
K.V. Arjuna Gowda ◽  
R.P.S. Chakradhar
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Cost Effective ◽  
Sio2 Films ◽  
Sol Gel Process

Synthesis and Antimicrobial Properties of TiO2 and TiO2: Cu Thin Films Synthesised by a Cost Effective Sol–Gel Process

2012 ◽  
Vol 4 (4) ◽  
pp. 279-287 ◽  
Author(s):  
R. G. S. V. Prasad ◽  
J. L. Endrino ◽  
Nishanth Kumar Jain ◽  
Goutham Reddy ◽  
D. Basavaraju ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Cost Effective ◽  
Sol Gel Process

Development of Nanomaterials from Natural Resources for Various Industrial Applications

2009 ◽  
Vol 67 ◽  
pp. 71-76 ◽  
Author(s):  
V. Rajendran
Keyword(s):  
Natural Resources ◽  
Sol Gel ◽  
Industrial Applications ◽  
Nano Particles ◽  
Nano Materials ◽  
Chemical Methods ◽  
Structured Materials ◽  
Nano Alumina ◽  
Sol Gel Process ◽  
Antibacterial Textile

In the present study, the synthesis of nano structured materials such as nano alumina (Al2O3), nano silica (SiO2), and nano hydroxyapatite (HAp) have been discussed for industrial applications. The oxide nano materials are prepared employing chemical methods from natural resources. The HAp is prepared employing sol-gel process using chemical precursors. The synthesised nano alumina (Al2O3) powder has been used to improve the physicochemical properties of refractories. The prepared nano particles employing different process techniques have been characterized using XRD, FTIR, EDAX and SEM studies. The silica nano particles have been coated on textiles to get the wrinkle free/antibacterial textile cloths/products. The synthesized nanoparticles from natural resources have been used in various industrial applications such as refractories, textiles and biomedical field.

scholarly journals Photocatalytic Reduction of AuCl4- by Fe3O4/SiO2/TiO2 Nanoparticles

2020 ◽  
Keyword(s):  
Tio2 Nanoparticles ◽  
Uv Light ◽  
Electronic Waste ◽  
Sol Gel ◽  
Photocatalytic Reduction ◽  
Light Illumination ◽  
Magnetite Fe3o4 ◽  
Sol Gel Process ◽  
Competitive Reduction ◽  
Closed Reactor

<p>Metallurgy and recovery of gold in electronic waste sometimes involve the reduction of tetrachloroaurate ion (AuCl4-) to elemental gold form. Currently, for the reduction of tetrachloroaurate ion, people use reducing agents such as hydroquinone and sodium borohydride. Photocatalysts of Fe3O4/SiO2/TiO2 nanoparticles were prepared and tested for the reduction of tetrachloroaurate ion under UV light illumination. The magnetite (Fe3O4) nanoparticle was first prepared by coprecipitation and sonication, followed by SiO2 and TiO2 coatings via the sol-gel process and calcination. The products were confirmed by XRD and TEM. The photocatalytic reduction of tetrachloroaurate ion was performed in a closed reactor equipped with a UV light source. The results indicated that Fe3O4/SiO2/TiO2 nanoparticles were successfully prepared, which retained good magnetic and photocatalytic properties. The photocatalytic reaction is best performed at a pH of 5 under UV irradiation for 2 h, which is capable of reducing 96% of the tetrachloroaurate present in the mixture. The co-presence of Ni2+ and Cu2+ ions in the solution leads to a decrease in yield due to competitive reduction and adsorption. The photocatalyst is recoverable by the use of a magnetic bar and may find application for gold recovery and metallurgy.</p>

scholarly journals Synthesis & characterization of nanostructure VO2 thin film

2021 ◽  
Vol 2070 (1) ◽  
pp. 012098
Author(s):  
P K Ojha ◽  
S K Mishra
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Vanadium Dioxide ◽  
Sol Gel ◽  
Cost Effective ◽  
Metallic Phase ◽  
Strongly Correlated ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Process

Abstract Vanadium dioxides are strongly correlated systems which undergo an insulator-metal transition (IMT) from a low-temperature semiconducting phase to a high-temperature metallic phase. Among them, Vanadium dioxide (VO2) undergoes IMT close to room temperature, accompanied by a structural transition resulting change of several orders of magnitude in the electrical and optical properties. Here, we present the synthesis of VO2 by sol-gel process which employs cost-effective precursors to synthesize pure phase of VO2 thin films. The synthesized thin films were characterized using an X-ray diffraction (XRD) to confirm phase purity and high resolution scanning electron microscope (HR-SEM) to study the crystallite and particle size for the synthesized films. The film’s surface was analyzed by X-ray photoelectron spectroscopy (XPS) to determine the valence state and chemical composition of vanadium dioxide.

scholarly journals Antimicrobial Properties of Nanostructured TiO2 Plus Fe Additive Thin Films Synthesized by a Cost-Effective Sol–Gel Process

2011 ◽  
Vol 3 (5) ◽  
pp. 629-636 ◽  
Author(s):  
J. L. Endrino ◽  
R. G. S. V. Prasad ◽  
D. Basavaraju ◽  
K. N. Rao ◽  
A. Mosquera ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Cost Effective ◽  
Sol Gel Process
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