Metal-Carbon Composites Based on Lignosulfonates
Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2020, Vol 10, Issue 3
Abstract
The synthesis of the new nanostructured metal-carbon composites (NMCC) based on lignosulfonates was proposed. Obtaining and studying the properties of NMCC is a crucial task of modern materials chemistry due to the use of the materials based on them in various fields of science and technology as ion-selective electrodes and electrochemical cathodes, supercapacitors, magnetic sensors, information recording and storage devices, heterogeneous catalysts. The synthesis method, which allows the formation of particles of a certain shape and size, which subsequently determine the properties of the composite material (sorption, electrochemical, catalytic, magnetic and optical), acquires decisive importance in the production of the new materials. The research purpose is to study the influence of the synthesis conditions of NMCC based on carbon-containing organic raw materials (lignosulfonates, chitosan and polyethylene polyamine) and embedded metal on the structure and physico-chemical properties of the new materials. The feature of the developed approach is the colloid-chemical synthesis with subsequent carbonization, which allows to obtain a highly dispersed NMCC with the developed micro- and mesoporous structure, specific surface area up to 400 m2/g and a narrow particle size (30–65 nm) distribution. Metal binds to sodium lignosulfonate (LS) at the stage of chelate complex formation, which upon mutual coagulation with chitosan (CT) or polyethylene polyamine (PEPA) forms a water-insoluble compound (polymer metalorganic complex). The degree of extraction of Co(II) ions from aqueous solutions during the formation of the LS–Co–CТ metal complex is 78.6 % (LS : CТ mass ratio is 1 : 0.25) and the LS–Co–PEPA complex is 56.3 % (LS : PEPA mass ratio is 1 : 0.1). Centrifugation and washing with acetone followed by carbonization allow the metal to be fixed in the structure of the NMCC. The synthesis conditions, including the quantitative ratio of polymer components (LS : CT – 1 : 0.25 and LS : PEPA – 1 : 0.1), the duration of the formation of the chelate complex (1 h) and the metal-organic composite (1 h) and pH (4–6), were analyzed. The morphology of the NMCC was studied by electron microscopy, and the parameters of the porous structure were found by the method of low-temperature nitrogen adsorption. Carbon nanomaterials based on cheap starting polymers and obtained in the mild synthesis conditions are promising for practical use as effective sorbents and catalysts, as well as for environmental protection.
Authors and Affiliations
O. S. Brovko, I. A. Palamarchuk, N. A. Gorshkova, A. D. Ivakhnov
Keywords
Related Articles
- EP ID EP683375
- DOI 10.37482/0536-1036-2020-3-159-168
- Views 254
- Downloads 0
Assessment of Urban Forest Biological Productivity (Case Study of the Voronezh Upland Oak Forest)
Fast-paced rates of urbanization reduce the area of forestlands. As a result, the volumes of photosynthesis, metabolic processes, oxygen production, carbon deposition and other processes are decreasing. All of this gives...
The Effect of the Knife Tacking Type on the Process of Producing Microcrystalline Cellulose
The article shows the possibility of intensifying the process of producing microcrystalline cellulose via pregrinding of fibrous semi-finished products before hydrolysis. The technological factors determining the grindin...
Formation and Dynamics of the Biotope of Pine Plantations on Peat Soils after Irrigation Improvement
Wetlands in the Russian Forest Fund occupy more than 12 % of the country’s territory exceeding 100 mln ha. These are primarily afforested swamps with low-quality forest stands. A significant part of raised bogs is genera...
Mathematical Modeling of the Route of Logging Roads
The implementation of tasks related to the development of the transportation network as a whole and logging roads as an integral part of it requires scientifically based theoretical studies of the patterns of formation o...
Physical and Chemical Soil Properties of Mangrove Forests in Vietnam
Recently the area of mangrove (evergreen) forests growing along the coast of Vietnam has been significantly increased by artificial afforestation under the recognition of their ecological role and economic importance. Pr...