Biochar as a support for nanocatalysts and other reagents: Recent advances and applications

Lopes, Renata Pereira; Astruc, Didier

doi:10.1016/j.ccr.2020.213585

Cited by 124 publications

(39 citation statements)

References 346 publications

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“…Typically, they present very interesting electronic and conductive properties that arise from the extended conjugation of sp 2 atoms, although exceptions exist. For instance, nanodiamonds contain mainly sp 3 -hybridized carbon atoms, as the name suggests [28]. Nanocarbons have been engineered to feature sp-hybridized carbon atoms as well, especially for energy conversion and storage applications [29].…”

Section: Carbon Nanostructures Properties and Usesmentioning

confidence: 99%

“…2 @ denotes core@shell structure. 3 SWCNTs = single-walled carbon nanotubes. 4 C 60 is a fullerene with 60 carbon atoms.…”

Section: Carbon Nanostructures As Templates For Titania Nanomorphologiesmentioning

confidence: 99%

“…2 SWCNTs = single-walled carbon nanotubes. 3 SDBS = sodium dodecylbenzene sulfonate. 4 C 60 is a fullerene with 60 carbon atoms.…”

Section: Carbon Nanostructures As Templates For Titania Nanomorphologiesmentioning

confidence: 99%

“…Despite the many advantages offered by titania, this material also suffers from some drawbacks, such as a rapid recombination of the photo-excited charge carriers and the relatively wide band gap (in the range of 3.2 eV) which implies a poor utilization of solar Despite the many advantages offered by titania, this material also suffers from some drawbacks, such as a rapid recombination of the photo-excited charge carriers and the relatively wide band gap (in the range of 3.2 eV) which implies a poor utilization of solar light due to the small percentage of UV radiation of sunlight reaching the Earth's surface. Remedies that have been developed to address these issues include the use of suitable supports [3], doping with other elements [4], embedding in composites [5], and the development of suitable nanostructures [6], also following green protocols [7]. These approaches have indeed allowed the practical widespread use of TiO2-for instance, for biomass conversion processes [8]-thanks to the improved hydrothermal stability of the catalyst [9].…”

Section: Introduction 1titania Properties and Usesmentioning

confidence: 99%

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Carbon Nanostructures Decorated with Titania: Morphological Control and Applications

et al. 2021

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Nanostructured titania (TiO2) is the most widely applied semiconducting oxide for a variety of purposes, and it is found in many commercial products. The vast majority of uses rely on its photo-activity, which, upon light irradiation, results in excited states that can be used for diverse applications. These range from catalysis, especially for energy or environmental remediation, to medicine—in particular, to attain antimicrobial surfaces and coatings for titanium implants. Clearly, the properties of titania are enhanced when working at the nanoscale, thanks to the increasingly active surface area. Nanomorphology plays a key role in the determination of the materials’ final properties. In particular, the nucleation and growth of nanosized titania onto carbon nanostructures as a support is a hot topic of investigation, as the nanocarbons not only provide structural stability but also display the ability of electronic communication with the titania, leading to enhanced photoelectronic properties of the final materials. In this concise review, we present the latest progress pertinent to the use of nanocarbons as templates to tailor nanostructured titania, and we briefly review the most promising applications and future trends of this field.

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Section: Carbon Nanostructures Properties and Usesmentioning

confidence: 99%

“…2 @ denotes core@shell structure. 3 SWCNTs = single-walled carbon nanotubes. 4 C 60 is a fullerene with 60 carbon atoms.…”

Section: Carbon Nanostructures As Templates For Titania Nanomorphologiesmentioning

confidence: 99%

“…2 SWCNTs = single-walled carbon nanotubes. 3 SDBS = sodium dodecylbenzene sulfonate. 4 C 60 is a fullerene with 60 carbon atoms.…”

Section: Carbon Nanostructures As Templates For Titania Nanomorphologiesmentioning

confidence: 99%

Section: Introduction 1titania Properties and Usesmentioning

confidence: 99%

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Carbon Nanostructures Decorated with Titania: Morphological Control and Applications

et al. 2021

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“…Biochar is employed in agriculture for soil remediation and as an adsorbent in environmental applications, e.g., the removal of organic and inorganic pollutants. In the domain of materials science, biochar was found to be a unique source for making graphene [7] but raised hope, if valorized, for its use as a support of nanocatalysts [8]. In the latter case, biochar is usually produced then post-treated for the immobilization of metal ions, which is followed by in situ reduction, resulting in immobilized nanocatalysts [9].…”

Section: Introductionmentioning

confidence: 99%

Copper/Nickel-Decorated Olive Pit Biochar: One Pot Solid State Synthesis for Environmental Remediation

et al. 2021

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Developing micro- and nanomaterials for environmental pollution remediation is currently a pertinent topic. Among the plethora of strategies, designing supported nanocatalysts for the degradation of pollutants has achieved prominence. In this context, we are addressing one of the UN Sustainable Development Goals by valorizing agrowaste as a source of biochar, which serves as a support for bimetallic nanocatalysts. Herein, olive pit powder particles were impregnated with copper and nickel nitrates and pyrolyzed at 400 °C. The resulting material consists of bimetallic CuNi-decorated biochar. CuNi nanocatalysts were found to be as small as 10 nm and very well dispersed over biochar with zero valent copper and nickel and the formation of copper–nickel solid solutions. The biochar@CuNi (B@CuNi) exhibited typical soft ferromagnet hysteresis loops with zero remanence and zero coercivity. The biochar@CuNi was found to be an efficient catalyst of the reduction in methyl orange (MO) dye, taken as a model pollutant. In sum, the one-pot method devised in this work provides unique CuNi-decorated biochar and broadens the horizons of the emerging topic of biochar-supported nanocatalysts.

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Waste‐Derived Biocarbons as Nonnoble Metal Catalysts and Supports for Nanocatalysts for Fuel Cells Reactions in Alkaline Media

Rodríguez‐Varela

Alonso-Lemus

2021

Encyclopedia of Electrochemistry

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Encouraging results have been obtained from the characterization and testing of biocarbons derived from widely available waste biomass, foreseeing their use in anion exchange membrane fuel cells (AEMFC). Pyrolysis is the most common route to synthetize biocarbons from biomass, but hydro‐ and solvothermal treatments have gained attention because of the possibility of developing hierarchically ordered structures. In most cases, biocarbons from biomass are self‐doped with heteroatoms, although the relative concentration of those species can be increased by doping during the thermal treatment of the biomass. Moreover, their surface chemistry can be modified to create functional groups that act as centers for the adsorption of molecules and the anchorage of nanoparticles. The most common application of the structurally disorder and amorphous biocarbons is as self‐standing metal‐free electrocatalysts for the oxygen reduction reaction (ORR). To a lesser extent, biocarbons have been investigated as supports of noble metal and nonnoble metal nanoparticles. In the first case, the application has been mostly as anodes for the oxidation of organic molecules, since Pt and Pd are highly active for such reactions. In the second, the impregnation of biocarbons mainly with Co and Fe nanoparticles has promoted a high catalytic activity for the ORR. Being produced from cheap biomass resources, the technological challenge of biocarbons is to achieve the high electrocatalytic performance required to contend with, and eventually replace, the benchmark Pt/C (as electrocatalysts) and Vulcan XC‐72 (as support).

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Biochar as a support for nanocatalysts and other reagents: Recent advances and applications

Cited by 124 publications

References 346 publications

Carbon Nanostructures Decorated with Titania: Morphological Control and Applications

Carbon Nanostructures Decorated with Titania: Morphological Control and Applications

Copper/Nickel-Decorated Olive Pit Biochar: One Pot Solid State Synthesis for Environmental Remediation

Waste‐Derived Biocarbons as Nonnoble Metal Catalysts and Supports for Nanocatalysts for Fuel Cells Reactions in Alkaline Media

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