Obtaining activated biochar from olive stone using a bench scale high-pressure thermobalance

Puig-Gamero, M.; Esteban-Arranz, Adrián; Sánchez-Silva, L.; Sánchez, Paula

doi:10.1016/j.jece.2021.105374

Cited by 17 publications

(8 citation statements)

References 59 publications

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“…The G band is assigned to aromatic ring breathing and C=C bonds. The D/G intensity ratio (peak height ratio) are in the 0.79-0.89 range, higher than 0.67 obtained for the same biochar prepared under slightly different conditions, at 400 °C under N2/H2 mixture [21], and also higher than 0.58 obtained for Spanish olive stones carbonized at 600 °C [39]. The slightly higher D/G ratio indicates increase in defects.…”

Section: Resultsmentioning

confidence: 71%

“…Interestingly, all spectra exhibit doublets characteristic of carbon-based matter. Indeed, two peaks coined D and G, are centred at 13511 and 15765 cm -1 , respectively (Figure 3) [39]. The D band accounts for defects in the biochar chemical structure, for example C-C bonds between aromatic rings [40] as well as C-O defects [39].…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, two peaks coined D and G, are centred at 13511 and 15765 cm -1 , respectively (Figure 3) [39]. The D band accounts for defects in the biochar chemical structure, for example C-C bonds between aromatic rings [40] as well as C-O defects [39]. The G band is assigned to aromatic ring breathing and C=C bonds.…”

Section: Resultsmentioning

confidence: 99%

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Citric Acid-Assisted Preparation of Biochar Loaded with Copper/Nickel Bimetallic Nanoparticles

Omiri¹,

Snoussi²,

Bhakta³

et al. 2022

Preprint

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Biochar is a carbon allotrope obtained by pyrolysis of biomass, usually agro-waste. Owing to the demand for sustainable development, biochar is continuously raising much hope in the scientific community. However, in order to impart it with new properties, its modification is required, either in situ during pyrolysis, or after the carbonization process. Herein, we propose a new direct approach to obtain bimetallic copper/nickel nanoparticle-loaded on olive stone biochar. The bimetallic-coated biochar and the reference materials bare biochar, copper-loaded and nickel-loaded biochar were prepared at 400 °C under a stream of dinitrogen from olive pit powder particles impregnated first with citric acid (CA), and then with copper and nickel nitrates. We have employed citric acid in the process in order to check its effect on the structural and textural properties of biochar supporting the metallic nanoparticles. Surprisingly, citric acid induced the formation of agglomerated or even raspberry-shaped, bimetallic copper/nickel nanoparticles. Large 450-500 nm-sized agglomerates of ~80 nm bimetallic CuNi NPs were noted for B-CA@CuNi. Interestingly, for biochar material prepared with initial Cu/Ni=10 molar ratio (B-CA@CuNi10/1), the bimetallic NPs formed unusual nano-raspberries (1748 nm in size) which are agglomerates of individual 10-20 nm-sized CuNi10/1 nanoparticles. The B-CA@CuNi and reference materials were characterized by Raman spectroscopy, scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and magnetometry. The B-CA@CuNi and B-CA@Ni materials could be attracted efficiently with a magnet, but not B-CA@CuNi10/1 due to a low nickel loading. B-CA@CuNi was tested as a catalyst for the degradation of methyl orange (MO). Discoloration was noted within 10 min, much faster than a similar material prepared in the absence of CA. B-CA@CuNi could be recycled at least 3 times with exhibit as fast discoloration catalysis performance. This paper stresses the important role of citric acid in shaping the bimetallic nanoparticles loaded in situ on biochar during the slow pyrolysis process and to enable faster catalysed discoloration of organic dye solution.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

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Citric Acid-Assisted Preparation of Biochar Loaded with Copper/Nickel Bimetallic Nanoparticles

Omiri¹,

Snoussi²,

Bhakta³

et al. 2022

Preprint

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“…More recently, Puig-Gamero et al 262 produced activated carbons from OS by single-step activation with steam and CO 2 , in a bench-scale high-pressure thermobalance. Activating conditions were optimised to obtain the highest adsorption capacity.…”

Section: Selectivitymentioning

confidence: 99%

Prospects of low‐temperature solid sorbents in industrial CO₂ capture: A focus on biomass residues as precursor material

et al. 2023

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Adsorption using bio-based adsorbents has been pointed out as an economical and environmentally benign technology for CO 2 gas separation and storage. A bio-based adsorbent can be fabricated from low-cost worldwide available biomass feedstock and bio-wastes from different industries (e.g., dairy manure, forestry, agriculture). As a result, it is a carbon rich material of hydrophobic nature, activated to gain high porosity development, and requires mild regeneration conditions. However, large-scale deployment of bio-based adsorption processes remains challenging. Our group has been intensively developing biomass-based adsorbents in conjunction with the design of tailored CO 2 adsorption-based cyclic processes for the envisioned application. Herein, key concepts on adsorption technology, biomass waste management, and different activation techniques for biomass-based adsorbent precursors are discussed. This review addresses the most relevant studies in the literature, from lab experimentation on a milligram scale (volumetric and gravimetric tests) to dynamic tests in bench or large-scale cyclic adsorption processes (i.e., pressure swing adsorption, temperature swing adsorption, vacuum swing adsorption). Therefore, the main target is to give a holistic view of the industrial applications where CO 2 separations with these materials are more suitable. Finally, concluding remarks and future perspectives of bio-based adsorbents in carbon capture are presented.

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“…Currently, materials of natural origin are often used as precursors in the synthesis of carbonaceous materials [ 4 ]. For this purpose are used, e.g., corn cobs [ 5 ], nutshells [ 6 ], pomegranate peels [ 7 ], coconut shells [ 8 ], coir pith [ 9 ], brazilian nutshell [ 10 ], palm fruits shells [ 11 ], oil palm fruits shells [ 12 ], olive stones [ 13 ], jackfruit shell waste and jackfruit peels [ 14 ], rice husk [ 15 ], banana peels [ 16 ], apple pulp [ 17 ], cotton stalk [ 18 ], and egg white biomass [ 19 ]. There are also reports describing biological precursors used in the production of carbonaceous materials [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Activated Carbons Obtained from Orange Peels, Coffee Grounds, and Sunflower Husks—Comparison of Physicochemical Properties and Activity in the Alpha-Pinene Isomerization Process

et al. 2021

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This work presents studies on the preparation of porous carbon materials from waste biomass in the form of orange peels, coffee grounds, and sunflower seed husks. The preparation of activated carbons from these three waste materials involved activation with KOH followed by carbonization at 800 °C in an N2 atmosphere. This way of obtaining the activated carbons is very simple and requires the application of only two reactants. Thus, this method is cheap, and it does not generate much chemical waste. The obtained activated carbons were characterized by XRD, SEM, XPS, and XRF methods. Moreover, the textural properties, acidity, and catalytic activity of these materials were descried. During catalytic tests carried out in the alpha-pinene isomerization process (the use of the activated carbons thus obtained in the process of alpha-pinene isomerization has not been described so far), the most active were activated carbons obtained from coffee grounds and orange peels. Generally, the catalytic activity of the obtained materials depended on the pore size, and the most active activated carbons had more pores with sizes of 0.7–1.0 and 1.1–1.4 nm. Moreover, the presence of potassium and chlorine ions in the pores may also be of key importance for the alpha-pinene isomerization process. On the other hand, the acidity of the surface of the tested active carbons did not affect their catalytic activity. The most favorable conditions for carrying out the alpha-pinene isomerization process were the same for the three tested activated carbons: temperature 160 °C, amount of the catalyst 5 wt.%, and reaction time 3 h. Kinetic studies were also carried out for the three tested catalysts. These studies showed that the isomerization over activated carbons from orange peels, coffee grounds, and sunflower seed husks is a first-order reaction.

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Obtaining activated biochar from olive stone using a bench scale high-pressure thermobalance

Cited by 17 publications

References 59 publications

Citric Acid-Assisted Preparation of Biochar Loaded with Copper/Nickel Bimetallic Nanoparticles

Citric Acid-Assisted Preparation of Biochar Loaded with Copper/Nickel Bimetallic Nanoparticles

Prospects of low‐temperature solid sorbents in industrial CO₂ capture: A focus on biomass residues as precursor material

Activated Carbons Obtained from Orange Peels, Coffee Grounds, and Sunflower Husks—Comparison of Physicochemical Properties and Activity in the Alpha-Pinene Isomerization Process

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