A Brief Overview on the Anticorrosion Performances of Sol-Gel 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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Biogenic Nanosilica Synthesis Employing Agro-Waste Rice Straw and Its Application Study in Photocatalytic Degradation of Cationic Dye

Sustainability ◽

10.3390/su14010539 ◽

2022 ◽

Vol 14 (1) ◽

pp. 539

Author(s):

Garima Singh ◽

Hossein Beidaghy Dizaji ◽

Hariprasad Puttuswamy ◽

Satyawati Sharma

Keyword(s):

Photocatalytic Degradation ◽

Rice Straw ◽

Crop Residues ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Well Being ◽

Good Health ◽

Synthesis Process ◽

Industrial Sectors

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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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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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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Aqueous colloidal sol–gel route to synthesize nanosized ceria-doped titania having high surface area and increased anatase phase stability

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-007-1583-1 ◽

2007 ◽

Vol 43 (3) ◽

pp. 299-304 ◽

Cited By ~ 38

Author(s):

Pradeepan Periyat ◽

K. V. Baiju ◽

P. Mukundan ◽

P. Krishna Pillai ◽

K. G. K. Warrier

Keyword(s):

Surface Area ◽

Phase Stability ◽

Anatase Phase ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Doped Titania

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Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Catalysts ◽

10.3390/catal10040423 ◽

2020 ◽

Vol 10 (4) ◽

pp. 423 ◽

Cited By ~ 2

Author(s):

Kamonchanok Roongraung ◽

Surawut Chuangchote ◽

Navadol Laosiripojana

Keyword(s):

Formic Acid ◽

Surface Area ◽

Gluconic Acid ◽

Photocatalytic Oxidation ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Value Added ◽

Incipient Wetness Impregnation ◽

Microwave Assisted

TiO2-based photocatalysts synthesized by the microwave-assisted sol-gel method was tested in the photocatalytic glucose conversion. Modifications of TiO2 with type-Y zeolite (ZeY) and metals (Ag, Cu, and Ag-Cu) were developed for increasing the dispersion of TiO2 nanoparticles and increasing the photocatalytic activity. Effects of the TiO2 dosage to zeolite ratio (i.e., TiO2/ZeY of 10, 20, 40, and 50 mol %) and the silica to alumina ratio in ZeY (i.e., SiO2:Al2O3 of 10, 100, and 500) were firstly studied. It was found that the specific surface area of TiO2/ZeY was 400–590 m2g−1, which was higher than that of pristine TiO2 (34.38 m2g−1). The good properties of 20%TiO2/ZeY photocatalyst, including smaller particles (13.27 nm) and high surface area, could achieve the highest photocatalytic glucose conversion (75%). Yields of gluconic acid, arabinose, xylitol, and formic acid obtained from 20%TiO2/ZeY were 9%, 26%, 4%, and 35%, respectively. For the effect of the silica to alumina ratio, the highest glucose conversion was obtained from SiO2:Al2O3 ratio of 100. Interestingly, it was found that the SiO2:Al2O3 ratio affected the selectivity of carboxylic products (gluconic acid and formic acid). At a low ratio of silica to alumina (SiO2:Al2O3 = 10), higher selectivity of the carboxylic products (gluconic acid = 29% and formic acid = 32%) was obtained (compared with other higher ratios). TiO2/ZeY was further loaded by metals using the microwave-assisted incipient wetness impregnation technique. The highest glucose conversion of 96.9 % was obtained from 1 wt. % Ag-TiO2 (40%)/ZeY. Furthermore, the bimetallic Ag-Cu-loaded TiO2/ZeY presented the highest xylitol yield of 12.93%.

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