Characterization and catalytic activity of Co/Mo-modified activated carbons derived from orange peels in limonene oxidation.

The possibility of using orange peels for the preparation of porous activated carbons by the chemical activation with HPO and the application of the obtained carbonaceous materials as the metal catalyst supports was investigated. Activated carbon and carbon-metal materials were used as the limonene oxidation catalysts. The materials were characterized by the following instrumental methods: the sorption of N2 at-196 °C, XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy) and SEM (Scanning Electron Microscope), XPS (The X-ray photoelectron spectroscopy).

Carbon Dioxide Adsorption over Activated Biocarbons Derived from Lemon Peel.

The rising concentration of CO in the atmosphere is approaching critical levels, posing a significant threat to life on Earth. Porous carbons derived from biobased materials, particularly waste byproducts, offer a viable solution for selective CO adsorption from large-scale industrial sources, potentially mitigating atmospheric CO emissions. In this study, we developed highly porous carbons from lemon peel waste through a two-step process, consisting of temperature pretreatment (500 °C) followed by chemical activation by KOH at 850 °C.

Chemical Activation of Banana Peel Waste-Derived Biochar Using KOH and Urea for CO Capture.

This article describes the synthesis and characterization of porous carbon derived from waste banana peels by chemical activation with KOH or by activation KOH and urea modification. The as-synthesized samples were carefully characterized by various techniques. The prepared carbonaceous materials possess highly developed micropore and mesopore structures and high specific surface area (up to 2795 cm/g for materials synthetized with KOH and 2718 cm/g for activated carbons prepared with KOH and urea).

Functional Activated Biocarbons Based on Biomass Waste for CO Capture and Heavy Metal Sorption.

Inexpensive porous activated biocarbons were prepared from biomass and agriculture waste following the method of thermal and hydrothermal carbonization and activation with superheated water vapor. The activated biocarbons were characterized by nitrogen adsorption-desorption at 77 K, SEM, XRD, Raman spectrometry, FTIR spectroscopy, determination of particle size, and elemental composition by XRF. The specific surface area was in the range of 240-709 m/g, and the total pore volume was from 0.

Biomass-based activated carbons produced by chemical activation with HPO as catalysts for the transformation of α-pinene to high-added chemicals.

In the era of ecology and careful care for the environment, it becomes important to use renewable raw materials of plant origin, which are often more easily available and cheaper. One of the important and rapidly developing directions of research are works related to the use of waste plant biomass; an example of this trend is the production of activated carbons from food industry waste. One of the examples of the application of derived from biomass activated carbons can be using them as catalysts for the isomerization of terpene compounds.

Carbon Dioxide Adsorption over Activated Carbons Produced from Molasses Using HSO, HPO, HCl, NaOH, and KOH as Activating Agents.

Cost-effective activated carbons for CO adsorption were developed from molasses using HSO, HPO, HCl, NaOH, and KOH as activating agents. At the temperature of 0 °C and a pressure of 1 bar, CO adsorption equal to 5.18 mmol/g was achieved over activated carbon obtained by KOH activation.

Waste-based nanoarchitectonics with face masks as valuable starting material for high-performance supercapacitors.

Surgical face masks waste is a source of microplastics (polymer fibres) and inorganic and organic compounds potentially hazardous for aquatic organisms during degradation in water. The monthly use of face masks in the world is about 129 billion for 7.8 billion people.

Management of surgical mask waste to activated carbons for CO capture.

The worldwide COVID-19 pandemic has resulted in a huge amount of face masks being used up and thrown away, resulting in increased environmental pollution and infection risks. In our work, we have developed a highly efficient process of neutralizing face mask waste into a useful carbon material. Then, the prepared activated carbon was used for CO adsorption studies.

Activated Carbon Modification towards Efficient Catalyst for High Value-Added Products Synthesis from Alpha-Pinene.

DT0-activated carbons modified with HCl and HNO acids, which were used for the first time in the catalytic process of alpha-pinene isomerization, are presented in this study. The carbon materials DT0, DT0_HCl, DT0_HNO, and DT0_HCl_HNO were examined with the following methods: XRF, SEM, EDX, XPS, FT-IR, XRD, and N adsorption at -196 °C. It was shown that DT0_HCl_HNO-activated carbon was the most active material in the alpha-pinene isomerization process.

FeCl-Modified Carbonaceous Catalysts from Orange Peel for Solvent-Free Alpha-Pinene Oxidation.

The work presents the synthesis of FeCl-modified carbonaceous catalysts obtained from waste orange peel and their application in the oxidation of alpha-pinene in solvent-free reaction conditions. The use of waste orange peel as presented here (not described in the literature) is an effective and cheap way of managing this valuable and renewable biomass. FeCl-modified carbonaceous materials were obtained by a two-stage method: in the first stage, activated carbon was obtained, and in the second stage, it was modified by FeCl in the presence of HPO (three different molar ratios of these two compounds were used in the studies).

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

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 N atmosphere. This way of obtaining the activated carbons is very simple and requires the application of only two reactants.

Conversion of fruit waste-derived biomass to highly microporous activated carbon for enhanced CO capture.

Activated carbons were prepared from different Amazonian fruit waste-derived biomass residues from the Amazon to store CO at low pressure. The samples were carbonized in under flowing N flow atmosphere and activated with KOH. The carbon materials obtained were physically and structurally characterized by the analysis of N isotherms for textural characterization, X-ray fluorescence (XRF), ash content, X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and applied for CO adsorption.