Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

Braghiroli, Flavia Lega; Fierro, Vanessa; Szczurek, Andrzej; Gadonneix, Philippe; Ghanbaja, Jaâfar; Parmentier, Julien; Medjahdi, Ghouti; Celzard, Alain

doi:10.3390/inorganics5010007

Cited by 18 publications

(15 citation statements)

References 67 publications

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“…Furthermore, the hydrothermal treatment of tannin–metal hybrid materials recently became of interest, resulting in metal–carbon materials. Braghiroli et al [ 71 ] trialed the usage of condensed mimosa tannin combined with various dissolved transition metals (V, Cr, Ni, and Fe) as well as their hydrothermal treatment for the generation of porous metal oxides and metal–carbon hybrid materials. On the one hand, they investigated the influence of the four above-mentioned metals, which are dissolved in the aqueous tannin solution, then carbonized at 180 °C for 24 h, and subsequently calcined at 550 °C in air, on the morphology of the resulting particles.…”

Section: Hybrid Materialsmentioning

confidence: 99%

Tannin-Based Hybrid Materials and Their Applications: A Review

et al. 2020

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Tannins are eco-friendly, bio-sourced, natural, and highly reactive polyphenols. In the past decades, the understanding of their versatile properties has grown substantially alongside a continuously broadening of the tannins’ application scope. In particular, recently, tannins have been increasingly investigated for their interaction with other species in order to obtain tannin-based hybrid systems that feature advanced and/or novel properties. Furthermore, in virtue of the tannins’ chemistry and their high reactivity, they either physicochemically or physically interact with a wide variety of different compounds, including metals and ceramics, as well as a number of organic species. Such hybrid or hybrid-like systems allow the preparation of various advanced nanomaterials, featuring improved performances compared to the current ones. Consequently, these diverse-shaped materials have potential use in wastewater treatment or catalysis, as well as in some novel fields such as UV-shielding, functional food packaging, and biomedicine. Since these kinds of tannin-based hybrids represent an emerging field, thus far no comprehensive overview concerning their potential as functional chemical building blocks is available. Hence, this review aims to provide a structured summary of the current state of research regarding tannin-based hybrids, detailed findings on the chemical mechanisms as well as their fields of application.

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Section: Hybrid Materialsmentioning

confidence: 99%

Tannin-Based Hybrid Materials and Their Applications: A Review

et al. 2020

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“…Finally, modifications of ZnO photocatalyst with carbon quantum dots (CQDs) have been mostly considered due to low toxicity, aqueous stability, enhanced surface area, economic feasibility, good biocompatibility, and chemical inertness of CQDs [161,172]. Many strategies have been developed to enhance the photocatalytic activity of conventional ZnO via coupling with CQDs, by principally following green and bio-sustainable chemical approaches [195][196][197][198][199]. Therefore, the unique properties of carbon-based/ZnO nanocomposites were used for charge separation, as they reduce the e − /h + pair recombination [200].…”

Section: Carbon-based/zno Hybridsmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

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Solar radiation is becoming increasingly appreciated because of its influence on living matter and the feasibility of its application for a variety of purposes. It is an available and everlasting natural source of energy, rapidly gaining ground as a supplement and alternative to the nonrenewable energy feedstock. Actually, an increasing interest is involved in the development of efficient materials as the core of photocatalytic and photothermal processes, allowing solar energy harvesting and conversion for many technological applications, including hydrogen production, CO2 reduction, pollutants degradation, as well as organic syntheses. Particularly, photosensitive nanostructured hybrid materials synthesized coupling inorganic semiconductors with organic compounds, and polymers or carbon-based materials are attracting ever-growing research attention since their peculiar properties overcome several limitations of photocatalytic semiconductors through different approaches, including dye or charge transfer complex sensitization and heterostructures formation. The aim of this review was to describe the most promising recent advances in the field of hybrid nanostructured materials for sunlight capture and solar energy exploitation by photocatalytic processes. Beside diverse materials based on metal oxide semiconductors, emerging photoactive systems, such as metal-organic frameworks (MOFs) and hybrid perovskites, were discussed. Finally, future research opportunities and challenges associated with the design and development of highly efficient and cost-effective photosensitive nanomaterials for technological claims were outlined.

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“…Several studies have obtained promising results by adding high valent metals to biomass precursors, thereby reducing the metals to zero valent metal nanoparticles [89][90][91] or metal oxide nanoparticles [92][93][94]. Metal nanostructures have presented enhanced electronic, magnetic, optical, and chemical properties over existing bulk materials [95][96][97][98].…”

Section: Biochar Functionalizationmentioning

confidence: 99%

Influence of Pyro-Gasification and Activation Conditions on the Porosity of Activated Biochars: A Literature Review

Braghiroli

Bouafif

Neculita

et al. 2019

Waste Biomass Valor

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Biochar is a carbon-rich organic material that has advantageous physicochemical properties for applications in multidisciplinary areas of science and engineering, including soil amendment, carbon sequestration, bioenergy production, and site rehabilitation. However, the typically low porosity and surface area of biochars (from 0.1 to 500 m 2 g-1) limits the suitability for other applications, such as catalysis, electrochemistry, energy storage, and contaminant sorption in drinking water and wastewater. Given the high global demand for activated carbon products, scientists and industrialists are exploring the potential of biochar-derived biomass as precursors for activated carbons. This review presents and discusses the available studies on activated biochars produced from various precursor feedstocks and under different operating conditions in a two-step procedure: pyro-gasification (torrefaction, slow to flash pyrolysis, and gasification) followed by activation (physical, chemical or physicochemical). Findings from several case studies demonstrate that lignocellulosic residues provide attractive precursors, and that chemical activation of the derived biochars at high temperature and long residence time produces highly porous end materials. Indeed, the porosity of activated biochars varies greatly (from 200 to 2500 m 2 g-1), depending on the pyro-gasification operating conditions and the feedstock (different feedstocks have distinct morphological and chemical structures). The results also indicate that the development of highly porous activated biochars for diverse purposes (e.g., electrodes for electrochemical energy storage devices, catalyst supports and adsorbents for water treatment) would benefit both the bioeconomy and the environment. Notably, it would leverage the potential of added-value biomass as an economical, non-fossil, readily available, and renewable energy source.

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Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

Cited by 18 publications

References 67 publications

Tannin-Based Hybrid Materials and Their Applications: A Review

Tannin-Based Hybrid Materials and Their Applications: A Review

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

Influence of Pyro-Gasification and Activation Conditions on the Porosity of Activated Biochars: A Literature Review

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