Multifunctional lignin-based nanocomposites and nanohybrids

Nanoscale zerovalent iron (nZVI) has proven to be a promising solution for contaminant remediation, but its application is limited due to its high cost of synthesis and instability. Encapsulating the nZVI in carbon spheres generates more stable particles with improved properties due to the adsorption capacity provided by the carbon. The aim of this work was to synthesize thin shell carbon-encapsulated iron nanoparticles (CE-nFe) through hydrothermal carbonization (HTC) using olive mill wastewater as a carbonaceous source, which is a cheaper and more sustainable method of synthesis than the current practice. With this method, a high quality nanomaterial was obtained, which displayed surface areas up to 220 m2/g and was composed of ∼4 nm iron nanoparticles spheres surrounded by a thin layer of carbon (<1 nm). The effect of HTC conditions on the nanoparticle structure and morphology was evaluated. Post-treatment of the samples under nitrogen flow at high temperatures (600–800 °C) was used to increase the ZVI...

/pdf/green-synthesis-of-thin-shell-carbon-encapsulated-iron-n4004xmn2z.pdf

Green Synthesis of Thin Shell Carbon-Encapsulated Iron Nanoparticles via Hydrothermal Carbonization

Aminated lignin chelated metal derived bifunctional electrocatalyst with high catalytic performance

Highly dispersed FeMn nanoparticles were encapsulated with a carbon layer to form a core–shell structure. This catalyst (FeMn@C) exhibited distinguished catalytic activity, high light-olefin selectivity (40.6%) and superior stability in the Fischer–Tropsch synthesis. Furthermore, it was revealed that the carbon layer facilitated the formation of χ-Fe5C2 with suitable particle size, which is responsible for the enhanced catalytic activity. In particular, the core–shell structure of FeMn@C could also influence the distribution of hydrocarbons and the catalyst stability due to the confinement effect.

Carbon-encapsulated highly dispersed FeMn nanoparticles for Fischer–Tropsch synthesis to light olefins

Iron-based catalysts encapsulated by nitrogen-doped graphitic carbon for selective synthesis of liquid fuels through the Fischer-Tropsch process

Lignin based synthesis of graphitic carbon-encapsulated iron nanoparticles as effective catalyst for forming lower olefins via Fischer-Tropsch synthesis

The invention provides a preparation method and an application of a yolk-shell structured GC (graphitized carbon)-encapsulated transition metal material. The preparation method comprises the followingsteps: preparation of a lignin-metal complex: surface functional groups of lignin are modified with a surface modification method, modified aminated lignin with amino groups is obtained, then the modified aminated lignin is subjected to coordination with transition metal with a hydrothermal method, and the lignin-metal complex is obtained; carbonization: the lignin-metal complex is subjected to step-by-step carbonization, chain-like carbon and aromatic carbon are controlled for step-by-step carbonization, then washing and drying are performed, and the yolk-shell structured GC-encapsulated transition metal material is obtained. Catalytic performance of the prepared yolk-shell structured GC-encapsulated transition metal material is improved.

Preparation method and application of yolk-shell structured GC (graphitized carbon)-encapsulated transition metal material

The invention relates to the technical field of activated carbon preparation, and particularly relates to durian shell activated carbon and a preparation method thereof. The preparation method comprises the following steps: cleaning durian shells, carrying out drying and crushing, then carrying out carbonization by H3PO4, mixing and grinding the obtained carbonized material with a composite activator, carrying out heating and activating under an inert gas condition, carrying out cooling to obtain an activated material, soaking the activated material with 4-6 wt% hydrochloric acid, carrying outfiltering, and carrying out washing with deionized water until the pH value of the filtrate is equal to 7, and carrying out drying to obtain the durian shell activated carbon with a high specific surface area. According to the invention, the waste durian shells are reasonably utilized, and the ecological environment is protected; the durian shell powder is modified by H3PO4, the specific surfacearea is increased, and the adsorption effect is improved; cost is saved by adopting the composite activator; and microwave heating is used, so that the activation time is shortened, heating is uniform, activation efficiency is improved, and energy conservation and environment protection are achieved.

Durian shell activated carbon and preparation method thereof

The invention relates to the technical field of catalyst preparation, and particularly relates to hydrogenation catalyst Co@C/ biomass as well as a preparation method and application thereof, the preparation method comprises the following steps: 1) carrying out reflux reaction on the biomass and an acid solution, washing the biomass by using deionized water, drying at normal temperature, sealing and storing; 2) respectively weighing a cobalt salt and 2-methylimidazole, and dissolving the cobalt salt and the 2-methylimidazole into methanol, and uniformly stirring to obtain a ZIF-67 precursor solution; 3) dipping the pre-treated biomass into the ZIF-67 precursor solution for aging, or putting the pre-treated biomass and the ZIF-67 precursor solution together into a hydrothermal reaction kettle for constant-temperature hydrothermal reaction, taking out the blocky biomass, and drying at normal temperature; 4) centrifuging and collecting precipitates in the hydrothermal reaction kettle, andwashing the precipitates with methanol for multiple times, and drying the precipitates to prepare a catalyst precursor ZIF-67; and (5) putting the biomass obtained in the step (3) into a porcelain boat, and calcining under N2 to prepare the hydrogenation catalyst Co@C/biomass; wherein the prepared catalyst Co@C/ biomass is used for a hydrogenation catalytic synthesis reaction.

Hydrogenation catalyst Co@C/ biomass as well as preparation method and application thereof

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Papers

Lignin based synthesis of graphitic carbon-encapsulated iron nanoparticles as effective catalyst for forming lower olefins via Fischer-Tropsch synthesis

Preparation method and application of yolk-shell structured GC (graphitized carbon)-encapsulated transition metal material

Durian shell activated carbon and preparation method thereof

Hydrogenation catalyst Co@C/ biomass as well as preparation method and application thereof