Showing papers by "Vitaliy L. Budarin published in 2020"
TL;DR: The present study systematically summarizes the far‐reaching and state‐of‐the‐art lignin valorization strategies during different stages, including conventional catalytic depolymerization of technical lign in, emerging reductive catalytic fractionation of protolignin, stabilization strategies to inhibit the undesired condensation reactions, and further catalytic upgrading of lignIn‐derived monomers.
Abstract: The efficient valorization of lignin could dictate the success of the 2nd generation biorefinery. Lignin, accounting for on average a third of the lignocellulosic biomass, is the most promising candidate for sustainable production of value-added phenolics. However, the structural alteration induced during lignin isolation is often depleting its potential for value-added chemicals. Recently, catalytic reductive depolymerization of lignin has appeared to be a promising and effective method for its valorization to obtain phenolic monomers. The present study systematically summarizes the far-reaching and state-of-the-art lignin valorization strategies during different stages, including conventional catalytic depolymerization of technical lignin, emerging reductive catalytic fractionation of protolignin, stabilization strategies to inhibit the undesired condensation reactions, and further catalytic upgrading of lignin-derived monomers. Finally, the potential challenges for the future researches on the efficient valorization of lignin and possible solutions are proposed.
157 citations
TL;DR: In this article, a two-dimensional CuO/BCN catalyst was used in microwave-assisted lignin conversion to improve the yields of aromatic monomers, and the results showed strong dependence of the conversion efficiency on the interunit linkages and functional groups of Lignin structures.
48 citations
TL;DR: In this paper, four low-value Norway spruce tree fractions - cones, branches, needles and bark -were separated from the main tree constituents for investigation of their lipophilic extractives; in order to identify potential sources of important chemicals for future biorefinery applications.
22 citations
TL;DR: In this article, the authors demonstrate that the integration of supercritical carbon dioxide extraction with slow pyrolysis is an effective method for the production of value added chemicals and charcoal that is an attractive alternative to coke for industry.
21 citations
TL;DR: In this paper, the authors examined the hydrolysis of rice starch, a major component in food waste, in NaCl(aq) solution under robust microwave heating, without adding catalysts and organic solvents to pursue green chemistry.
20 citations
TL;DR: In this article, a starch-initiated superheating mechanism was proposed to maximize the advantageous effects of MW in biorefineries of complex biomass feedstocks, where the functional groups gained higher degree of freedom serving as MW radiators to facilitate thermochemical depolymerization.
18 citations
TL;DR: In this paper, an advanced Sn-functionalised biochar catalyst was synthesized via a novel solvent-free ball milling protocol to facilitate the isomerisation of glucose to fructose.
17 citations
TL;DR: In this article, the role of the surface chemistry and porosity of bio-based mesoporous materials Starbon and the role this plays in the adsorption of toxic volatile molecules such as ammonia, as a basic adsorptive and two acidic gasses (hydrogen sulphide and sulphur dioxide) using an InfraSorp optical calorimeter.
11 citations
TL;DR: This article used microwave pyrolysis bio-oil from waste paper and K60 silica gel to synthesize mesoporous carbon-silica composites with uniquely tuneable surface properties, where functionality and structural characteristics can be altered and enhanced by curing at different temperatures.
Abstract: Microwave pyrolysis bio-oil from waste paper and K60 silica gel has successfully been utilised to synthesise mesoporous carbon–silica composites with uniquely tuneable surface properties, where functionality and structural characteristics can be altered and even enhanced by curing at different temperatures This temperature-dependence resulted in composites ranging from highly oxygenated polymerised bio-oil composites at 300 °C to aromatic carbonaceous materials covering the silica surface at 800 °C, making them attractive materials for gold recovery from mining wastewater The composite materials exhibit exceptional ability and selectivity to recover gold from dilute solutions Metal adsorption on the surface of these composites proceeded via both chemisorption and physisorption leading to the reduction of Au(III) to Au(0), resulting in high recovery capacities for gold Composite material prepared at 500 °C demonstrated the optimum combination of surface functionality and porosity, allowing for an adsorption capacity of 320 mg g−1 of gold and with 995% removal being achieved at concentrations mimicking those of real-life mine tailing wastes All materials pioneered in this research display great potential as selective adsorbents for the recovery of gold from acidic media
7 citations
TL;DR: The cultivation of oleaginous yeast on second-generation feedstocks is an attractive alternative for edible lipid production as discussed by the authors, despite many studies in this area addressing single aspects of this bio...
Abstract: The cultivation of oleaginous yeast on second-generation feedstocks is an attractive alternative for edible lipid production. Despite many studies in this area addressing single aspects of this bio...
2 citations
04 Dec 2020
TL;DR: In this paper, the microwave assisted noncatalytic pyrolysis of cellulose was reported as a green and controllable alternative to conventional heating, in the presence of eco-friendly Li-, Na-, K-, Mg-, Ca- and Ba-bentonites.
Abstract: Bio-oil (pyrolysis oil) is an essential feedstock for the production of renewable fossil-free fuels and valuable chemicals. Enhancement of the pyrolysis oil yield and its quality are significant challenges for an efficient and sustainable biorefinery. Here, we report the microwave (MW)-assisted noncatalytic pyrolysis of cellulose, as a green and controllable alternative to conventional heating, in the presence of eco-friendly Li-, Na-, K-, Mg-, Ca- and Ba-bentonites. The detailed analysis of the MV heating traces demonstrates that the bentonite MW activity significantly depends on the presence of internal water. The intensity of this interaction is controlled by the cation nature reduced in the order: Li+ > Na+ > K+ and Mg2+ > Ca2+ > Ba2+. A unique experimental design for the MW-assisted pyrolysis of cellulose in the presence of Li-doped clays helps to increase the bio-oil yield to 37.8% with high selectivity towards the commercially useful levoglucosan (purity: 39.36%). The combination of an alternative green heating method and environmentally friendly bentonites can be used many times without recycling. We believe that the improved yields of bio-oil are due to: (i) high MW activity of bentonites, which conventionally increases the heating rates of cellulose; and (ii) production of water by hydrophilic clay minerals, favouring depolymerisation of cellulose.