Biogenic Nanosilica Synthesis Employing Agro-Waste Rice Straw and Its Application Study in Photocatalytic Degradation of Cationic Dye

The current study aims towards a holistic utilization of agro-waste rice straw (RS) to synthesize nanosilica (SiNPs) employing the sol–gel method. The effect of ashing temperature was evaluated for the synthesis process. X-ray diffraction demonstrated a broad spectrum at 21.22° for SiNPs obtained using RSA-600, signifying its amorphous nature, whereas crystalline SiNPs were synthesized using RSA-900. The EDX and FTIR spectra confirmed the significant peaks of Si and O for amorphous SiNPs, confirming their purity over crystalline SiNPs. FE-SEM and TEM micrographs indicated the spheroid morphology of the SiNPs with an average size of 27.47 nm (amorphous SiNPs) and 52.79 nm (crystalline SiNPs). Amorphous SiNPs possessed a high surface area of 226.11 m2/g over crystalline SiNPs (84.45 m2/g). The results obtained attest that the amorphous SiNPs possessed better attributes than crystalline SiNPs, omitting the need to incorporate high temperature. Photocatalytic degradation of methylene blue using SiNPs reflected that 66.26% of the dye was degraded in the first 10 min. The degradation study showed first-order kinetics with a half-life of 6.79 min. The cost-effective and environmentally friendly process offers a sustainable route to meet the increasing demand for SiNPs in industrial sectors. The study proposes a sustainable solution to stubble burning, intending towards zero waste generation, bioeconomy, and achieving the Sustainable Development Goals (SDGs), namely SDG 13(Climate Action), SDG 3(Good health and well-being), SDG 7(use of crop residues in industrial sectors) and SDG 8 (employment generation).

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A Brief Overview on the Anticorrosion Performances of Sol-Gel Zeolite Coatings

Coatings ◽

10.3390/coatings9060409 ◽

2019 ◽

Vol 9 (6) ◽

pp. 409 ◽

Cited By ~ 7

Author(s):

Luigi Calabrese ◽

Edoardo Proverbio

Keyword(s):

Protective Coatings ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Future Trend ◽

Self Healing ◽

Research Activity ◽

Industrial Sectors ◽

Application Fields ◽

Zeolite Coatings

Research activity concerning nanoporous zeolites has grown considerably in recent decades. The structural porosity of zeolites provides versatile functional properties such as molecular selectivity, ion and molecule storage capacity, high surface area, and pore volume which combined with excellent thermal and chemical stability can extend its application fields in several industrial sectors. In such a context, anti-corrosion zeolite coatings are an emerging technology able to offer a reliable high performing and environmental friendly alternative to conventional chromate-based protective coatings. In this article, a focused overview on anti-corrosion performances of sol-gel composite zeolite coatings is provided. The topic of this review is addressed to assess the barrier and self-healing properties of composite zeolite coating. Based on results available in the literature, a property–structure relationship of this class of composites is proposed summarizing, furthermore, the competing anti-corrosion active and passive protective mechanisms involved during coating degradation. Eventually, a brief summary and a future trend evaluation is also reported.

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Photocatalytic Degradation of Acetaldehyde by Sol-Gel TiO2 Nanoparticles: Effect of the Physicochemical Properties on the Photocatalytic Activity

Materials Science Forum ◽

10.4028/www.scientific.net/msf.691.92 ◽

2011 ◽

Vol 691 ◽

pp. 92-98 ◽

Cited By ~ 8

Author(s):

R. Carrera ◽

A.L. Vázquez ◽

S. Castillo ◽

E.M. Arce Estrada

Keyword(s):

Photocatalytic Activity ◽

Photocatalytic Degradation ◽

Surface Area ◽

Photocatalytic Oxidation ◽

Crystal Size ◽

Uv Light ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Synthesis Method

Nowadays, nanostructured semiconductor materials offer promising opportunities for a new generation of materials such as TiO2nanoparticles with improved properties for their application in the environmental catalysis field. It is well known that the phocatalytic activity of the TiO2nanoparticles is strongly dependent on the surface area, crystal size, phase composition and synthesis method. Thus, the preparation conditions clearly affect the photocatalytic activity of the TiO2nanoparticles. This work deals with the study of the structure of TiO2nanoparticles that were synthesized by the sol-gel method (using isopropanol as solvent), and calcined at 200 and 500°C. The obtained samples were characterized by the XRD-Rietveld refinement, BET and TEM techniques; and tested in the photodecomposition of acetaldehyde. The evaluations were carried out at room temperature by using CH3CHO (300 ppmv), O2(2.0 %) in helium balance in a quartz glass photoreactor (gas phase) with a 365-UV light lamp. According to the results, the sample that presented the highest activity in the photocatalytic oxidation of acetaldehyde (96.4%) was the one annealed at 200 °C. This sample showed the following proportion of phases: anatase (62.88%) with a tetragonal structure (a=0.3790926, b=0.3790926, c=0.9495732) nm; and b) brookite (37.12%) with an orthorhombic structure (a=0.9167624, b=0.5416461, c=0.5210546) nm. The surface area was 189 m2/g and the average crystal size was 7.03 nm. From the results, it can be seen that this material showed high activity in the photocatalytic degradation of acetaldehyde because of: the presence of a mixture of the anatase (higher proportion) and brookite phases, nanometric crystal size and high surface area obtained in this TiO2material. According to the aforementioned, this material can be considered as a good option for the decomposition of acetaldehyde and other volatile organic compounds (VOCs) in confined spaces.

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Photocatalytic Degradation of Different Dyes Using TiO2 with High Surface Area: A Kinetic Study

Journal of Scientific Research ◽

10.3329/jsr.v5i2.11641 ◽

2013 ◽

Vol 5 (2) ◽

pp. 301-314 ◽

Cited By ~ 29

Author(s):

M. Z. Bin Mukhlish ◽

F. Najnin ◽

M M. Rahman ◽

M. J. Uddin

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Congo Red ◽

Degradation Kinetics ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Spectroscopic Technique ◽

Nanocrystalline Tio2 ◽

Commercial Tio2

Nanocrystalline TiO2 was synthesized by using one step sol-gel method and characterized by SEM, XRD and EDS. UV-Vis spectroscopic technique has been used for studying the photocatalytic degradation kinetics of methylene blue (MB) and congo red (CR). A comparative study with commercial TiO2 (P25) was also done to find out the effectiveness of this synthesized TiO2. The synthesized TiO2 exhibited a high photocatalytic activity for the degradation of MB and CR but the commercial TiO2 was more efficient.Keywords: Nanocrystalline TiO2; Methylene Blue; Congo Red; Photocatalytic degradation kinetics.© 2013 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v5i2.11641 J. Sci. Res. 5 (2), xxx-xxx (2013)

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High-Surface-Area Alumina-Silica Nanocatalysts Prepared by a Hybrid Sol-Gel Route Using a Boehmite Precursor

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2010.03997.x ◽

2010 ◽

Vol 93 (12) ◽

pp. 4047-4052 ◽

Cited By ~ 6

Author(s):

Padmaja Parameswaran Nampi ◽

Padmanabhan Moothetty ◽

Wilfried Wunderlich ◽

Frank John Berry ◽

Michael Mortimer ◽

...

Keyword(s):

Surface Area ◽

High Surface ◽

Sol Gel ◽

High Surface Area

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Synthesis and structural characteristics of high surface area TiO2 aerogels by ultrasonic-assisted sol–gel method

Nanotechnology ◽

10.1088/1361-6528/aaa1d1 ◽

2018 ◽

Vol 29 (7) ◽

pp. 075702 ◽

Cited By ~ 6

Author(s):

Feng Qingge ◽

Cai Huidong ◽

Lin Haiying ◽

Qin Siying ◽

Liu Zheng ◽

...

Keyword(s):

Surface Area ◽

Structural Characteristics ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Gel Method ◽

Sol Gel Method ◽

Ultrasonic Assisted

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Preparing high surface area porous carbon from biomass by carbonization in a molten salt medium

RSC Advances ◽

10.1039/c5ra12406a ◽

2015 ◽

Vol 5 (92) ◽

pp. 75728-75734 ◽

Cited By ~ 78

Author(s):

Huishan Shang ◽

Yanjie Lu ◽

Feng Zhao ◽

Cong Chao ◽

Bing Zhang ◽

...

Keyword(s):

Molten Salt ◽

Surface Area ◽

Porous Carbon ◽

High Surface ◽

High Surface Area ◽

Molten Salt Synthesis ◽

Synthesis Process ◽

Salt Medium ◽

Peanut Shells

Peanut shells were transformed into porous carbon with a high surface area through a simple ZnCl2-molten salt synthesis process.

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Texture Evaluation of Sol-Gel Derived Mesoporous Bioactive Glass

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.284-287.230 ◽

2013 ◽

Vol 284-287 ◽

pp. 230-234

Author(s):

Yu Jen Chou ◽

Chi Jen Shih ◽

Shao Ju Shih

Keyword(s):

Surface Area ◽

Calcination Temperature ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Nitrogen Adsorption ◽

Bioactive Glasses ◽

Transmission Electron ◽

Sol Gel Process ◽

Adsorption Desorption

Recent years mesoporous bioactive glasses (MBGs) have become important biomaterials because of their high surface area and the superior bioactivity. Various studies have reported that when MBGs implanted in a human body, hydroxyl apatite layers, constituting the main inorganic components of human bones, will form on the MBG surfaces to increase the bioactivity. Therefore, MBGs have been widely applied in the fields of tissue regeneration and drug delivery. The sol-gel process has replaced the conventional glasses process for MBG synthesis because of the advantages of low contamination, chemical flexibility and lower calcination temperature. In the sol-gel process, several types of surfactants were mixed with MBG precursor solutions to generate micelle structures. Afterwards, these micelles decompose to form porous structures after calcination. Although calcination is significant for contamination, crystalline and surface area in MBG, to the best of the authors’ knowledge, only few systematic studies related to calcination were reported. This study correlated the calcination parameters and the microstructure of MBGs. Microstructure evaluation was characterized by transmission electron microscopy and nitrogen adsorption/desorption. The experimental results show that the surface area and the pore size of MBGs decreased with the increasing of the calcination temperature, and decreased dramatically at 800°C due to the formation of crystalline phases.

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Recent Advances in Applications of Ceramic Nanofibers

10.5772/intechopen.97118 ◽

2021 ◽

Author(s):

Nuray Kizildag

Keyword(s):

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Ceramic Materials ◽

Water Remediation ◽

Mechanical And Thermal Properties ◽

Chemical Erosion ◽

Recent Advances ◽

Wide Range ◽

Ceramic Nanofibers

Ceramic materials are well known for their hardness, inertness, superior mechanical and thermal properties, resistance against chemical erosion and corrosion. Ceramic nanofibers were first manufactured through a combination of electrospinning with sol–gel method in 2002. The electrospun ceramic nanofibers display unprecedented properties such as high surface area, length, thermo-mechanical properties, and hierarchically porous structure which make them candidates for a wide range of applications such as tissue engineering, sensors, water remediation, energy storage, electromagnetic shielding, thermal insulation materials, etc. This chapter focuses on the most recent advances in the applications of ceramic nanofibers.

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