Reduced graphene oxide as an excellent platform to produce a stable Brønsted acid catalyst for biodiesel production

Santos, Thiago C. dos; Santos, Evelyn C. S.; Dias, Julianna P.; Barreto, Jade; Stavale, Fernando; Ronconi, Célia M.

doi:10.1016/j.fuel.2019.115793

Cited by 42 publications

(13 citation statements)

References 47 publications

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“…Ar ecent example has been given by Thiagoe tal. [312] in which graphene oxide (GO) and itsr educed form act as ap latform for covalently bonded sulfonic groups which enhancea cid-catalysed trans-esterification reactions. GO also has excellent properties such as ah igh surface to mass ratio (1000 m 2 g À1 )a nd good solubility in water,t hen the chemicaln ature of functional groups and their concentration onto the graphene plane can be directly tuned in solution by laser irradiation.…”

Section: Metal Oxidesi Nphotocatalysismentioning

confidence: 99%

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Amendola

Amans

Ishikawa

et al. 2020

Chemistry A European J

244

186

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Although oxide nanoparticles are ubiquitous in science and technology, a multitude of compositions, phases, structures, and doping levels exist, each one requiring a variety of conditions for their synthesis and modification. Besides, experimental procedures are frequently dominated by high temperatures or pressures and by chemical contaminants or waste. In recent years, laser synthesis of colloids emerged as a versatile approach to access a library of clean oxide nanoparticles relying on only four main strategies running at room temperature and ambient pressure: laser ablation in liquid, laser fragmentation in liquid, laser melting in liquid and laser defect‐engineering in liquid. Here, established laser‐based methodologies are reviewed through the presentation of a panorama of oxide nanoparticles which include pure oxidic phases, as well as unconventional structures like defective or doped oxides, non‐equilibrium compounds, metal‐oxide core–shells and other anisotropic morphologies. So far, these materials showed several useful properties that are discussed with special emphasis on catalytic, biomedical and optical application. Yet, given the endless number of mixed compounds accessible by the laser‐assisted methodologies, there is still a lot of room to expand the library of nano‐crystals and to refine the control over products as well as to improve the understanding of the whole process of nanoparticle formation. To that end, this review aims to identify the perspectives and unique opportunities of laser‐based synthesis and processing of colloids for future studies of oxide nanomaterial‐oriented sciences.

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Section: Metal Oxidesi Nphotocatalysismentioning

confidence: 99%

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Amendola

Amans

Ishikawa

et al. 2020

Chemistry A European J

244

186

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“…As observed, the incorporation of propionic acid and butyric acid was steadily enhanced to their respective maximum values of about 47.0 and 40.7% at 6 h. Then, these two values declined drastically by ca. 16.9 and 14.0% with 2 h of prolonged reaction time. This result was mostly due to the further hydrolysis of targeted SPLs into by-products, which would cover and/or partially destroy the active acid sites of the catalyst.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…In these regards, from the standpoint of economical production and sustainable development, great research efforts should be devoted to exploiting alternative heterogeneous catalysts for the synthesis of SCFA-containing SPLs through interesterification reactions . Presently, a great variety of solid acids such as Amberlyst-15, SO 4 2– -ZrO 2 , SO 3 H-carbon catalyst, sulfated graphene oxide, SO 4 2– -ZrO 2 -SiO 2 , and modified SBA-15 have been researched as catalysts for interesterification reactions. − Among these solid acids, the mesoporous SBA-15-type materials are always being perceived as one of the most promising heterogeneous catalysts owing to their extraordinary structural features, such as adjustable pore sizes, high specific surface areas, and excellent operational stabilities, and their facile surface modifications with various functional groups . Nevertheless, to the best of our knowledge, to date, no heterogeneous acid catalysts have been reported to be utilized in PL interesterifications for the production of SCFA-containing SPLs.…”

Section: Introductionmentioning

confidence: 99%

Efficient Synthesis of Structured Phospholipids Containing Short-Chain Fatty Acids over a Sulfonated Zn-SBA-15 Catalyst

Zhang

Cheng

et al. 2020

J. Agric. Food Chem.

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Catalytic production of structured phospholipids (SPLs) containing short-chain fatty acids (SCFAs) in an efficient heterogeneous manner is of great importance from the standpoint of food engineering. Herein, a bifunctionalized sulfonated Zn-SBA-15 catalyst was studied for SPL synthesis through interesterification of soybean lecithin with ethyl propionate or methyl butyrate. Various characterization techniques such as pyridine Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet−visible diffuse reflectance spectroscopy were conducted to determine the physicochemical properties, so as to build the possible structure−reactivity relationship of the catalyst. In screening tests with commercial Amberlyst-15 or other SBA-15-type materials, the as-prepared sample showed promising catalytic performance probably owing to its mesoporous structure and cooperative role of Bronsted and Lewis acid sites. Notably, the sample was easily separated and recycled without obvious deactivation. In general, the investigated catalyst was regarded as one of the promising alternatives to otherwise expensive biocatalysts for SCFA-containing SPL production.

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“…The dispersion was filtered, washed with distilled water (up to pH = 7) and dried at room temperature to originate the pre-oxidized graphite as a bright dark-gray solid (6.2 g). The second oxidation step was carried out following a modified Hummer's method [2] . H 2 SO 4 (115 mL, 2.16 mol) was transferred to a 3 L beaker in an ice/water bath, then the pre-oxidized graphite (6.18 g) and NaNO 3 (2.57 g, 30.2 mmol) were added under stirring.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Fabrication data of two light-responsive systems to release an antileishmanial drug activated by infrared photothermal heating

et al. 2022

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The data provided in this study are related to the fabrication of two light-responsive systems based on reduced graphene oxide (rGO) functionalized with the polymers Pluronic P123 (P123), rGO-P123, and polyethyleneimine (PEI), rGO-PEI, and loaded with amphotericin B (AmB), an antileishmanial drug. Here are described the experimental design to obtain the systems and characterization methods, such as Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR), Raman Spectroscopy, Powder X-Ray Diffraction, Transmission Electron Microscopy, Scanning Electron Microscopy and Thermogravimetric Analyses. Also, AmB spectroscopy studies are described. The materials rGO-P123 and rGO-PEI were loaded with AmB and the optimization of AmB and polymer fragments structures revealed several possible hydrogen bonds formed between the materials and the drug. The drug release was analyzed with and without Near-Infrared (NIR) light. In the studies conducted under NIR light irradiation for 10 min, an infrared lamp was disposed at 64 cm from the samples and an optical fiber thermometer was employed to measure the temperature variation. Cytotoxicity studies and antiproliferative assays against Leishmania amazonensis promastigotes were evaluated. The complete work data entitled Amphotericin-B-Loaded Polymer-Functionalized Reduced Graphene Oxides for Leishmania amazonensis Chemo-Photothermal Therapy have been published to Colloids and Surfaces B: Bionterfaces ( https://doi.org/10.1016/j.colsurfb.2021.112169 ) [1] .

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Reduced graphene oxide as an excellent platform to produce a stable Brønsted acid catalyst for biodiesel production

Cited by 42 publications

References 47 publications

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Efficient Synthesis of Structured Phospholipids Containing Short-Chain Fatty Acids over a Sulfonated Zn-SBA-15 Catalyst

Fabrication data of two light-responsive systems to release an antileishmanial drug activated by infrared photothermal heating

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