Microwave-assisted synthesis of ceria nanoparticles on carbon nanotubes and their dye-removal assesstment

López‐Tinoco, Julián; Lara‐Romero, Javier; Rangel, R.; Apolinar-Cortés, José; Paraguay‐Delgado, F.; Jiménez‐Sandoval, S.; Bazán-Díaz, Lourdes; Mendoza‐Cruz, Rubén

doi:10.1016/j.jmrt.2021.04.036

Cited by 19 publications

(2 citation statements)

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“…Even though enormous efforts and work have been devoted to the research of CeO 2 -based catalysts for the organic transformations, there is still much room for further development and applications, such as development of effective CeO 2 -based noble-metal-free catalysts, organic synthesis of inert chemical bonds under mild reaction conditions, synergetic effects of photons and thermal energy (e.g., photo effect on thermocatalysis, thermal effect on photocatalysis) on catalytic activity improvement, and detailed reaction mechanisms. In addition, as learned from the excellent catalytic performance of nanocarbon/ceria composites in electrocatalysis, photocatalytic degradation, , and thermocatalytic organic synthesis, ,,,, the combination of ceria with various kinds of nanostructured carbons (e.g., carbon nanotube, graphene nanosheets, graphene oxide, carbon dots) may provide great potential in organic synthesis, in which the nanostructured carbon may have various effects on stabilizing or even enhancing the activity of ceria-based catalysts in organic transformation via increasing the dispersion, stability, and electron transfer ability of ceria. However, this field is still at its early stage and needs further investigation and developments.…”

Section: Discussionmentioning

confidence: 99%

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

et al. 2021

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Value-added chemicals, fuels, and pharmaceuticals synthesized by organic transformation from raw materials via catalytic techniques have attracted enormous attention in the past few decades. Heterogeneous catalysts with high stability, long cycling life, good environmental-friendliness, and economic efficiency are greatly desired to accomplish the catalytic organic transformations. With the advantages of reversible Ce3+/Ce4+ redox pairs, tailorable oxygen vacancies, and surface acid–base properties, ceria-based catalysts have been actively investigated in the fields of catalytic organic synthesis. In this Review, we summarize the fundamentals and latest applications of ceria-based heterogeneous catalysts for organic transformations via thermocatalytic and photocatalytic routes. The fabricating approaches of various ceria and ceria-based catalysts and their structure/composition–activity relationship are discussed and prospected. The advanced characterization techniques and theoretical methods for reaction mechanism studies over CeO2-based catalysts are summarized and discussed. This comprehensive Review provides a basic understanding of the structure–performance relationships of ceria-based catalysts for organic synthesis. In addition, it also provides some insights and outlooks in the design and research direction in the ceria-based catalysts with better performance.

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Section: Discussionmentioning

confidence: 99%

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

et al. 2021

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“…The COM–MWCNT sample was not treated with chemical reagents. The peak at 2θ = 25.9° corresponds to diffraction from the (002) plane, characteristic of hexagonal graphite structures [ 34 ]. The signals detected at 2θ = 43°, 45°, and 53.5° correspond to the (100), (101), and (004) planes, characteristic of graphite structures [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Hazardous P-Nitroaniline from Wastewater by Using Surface-Activated and Modified Multiwalled Carbon Nanotubes with Mesostructure

Liou,

Huang

2024

Toxics

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P-nitroaniline (PNA) is an aniline compound with high toxicity and can cause serious harm to aquatic animals and plants. Multiwalled carbon nanotubes (MWCNTs) are a multifunctional carbon-based material that can be applied in energy storage and biochemistry applications and semiconductors as well as for various environmental purposes. In the present study, MWCNTs (CO2–MWCNTs and KOH–MWCNTs) were obtained through CO2 and KOH activation. ACID–MWCNTs were obtained through surface treatment with an H2SO4–HNO3 mixture. Herein, we report, for the first time, the various MWCNTs that were employed as nanoadsorbents to remove PNA from aqueous solution. The MWCNTs had nanowire-like features and different tube lengths. The nanotubular structures were not destroyed after being activated. The KOH–MWCNTs, CO2–MWCNTs, and ACID–MWCNTs had surface areas of 487, 484, and 80 m2/g, respectively, and pore volumes of 1.432, 1.321, and 0.871 cm3/g, respectively. The activated MWCNTs contained C–O functional groups, which facilitate PNA adsorption. To determine the maximum adsorption capacity of the MWCNTs, the influences of several adsorption factors—contact time, solution pH, stirring speed, and amount of adsorbent—on PNA adsorption were investigated. The KOH–MWCNTs had the highest adsorption capacity, followed by the CO2–MWCNTs, pristine MWCNTs, and ACID–MWCNTs. The KOH–MWCNTs exhibited rapid PNA adsorption (>85% within the first 5 min) and high adsorption capacity (171.3 mg/g). Adsorption isotherms and kinetics models were employed to investigate the adsorption mechanism. The results of reutilization experiments revealed that the MWCNTs retained high adsorption capacity after five cycles. The surface-activated and modified MWCNTs synthesized in this study can effectively remove hazardous pollutants from wastewater and may have additional uses.

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