This study investigates the structure and porosity of carbon nanocomposites synthesised from wheat straw using a two-stage method. Iron (III) chloride and nickel chloride were used as activators. It was found that iron chloride causes a significant increase in the microporosity of the carbon matrix. The magnetic phase in such a nanocomposite is magnetite.
Polymeric macrophotoinitiators are of considerable interest because they offer several advantages over low-molecular-weight initiators, such as low volatility, migration ability, reduced yellowing and odour effects, and improved compatibility with polymer matrices. In the present study, we report a new macrophotoinitiator synthesized via the acylation reaction of hydroxyl groups of the hydroxymethyl derivative of benzoin methyl ether with anhydride groups of a methacrylate copolymer containing maleic anhydride links.
Wastewater containing dyes at certain levels can be harmful to the environment. Removal of dye pollutants in wastewater can be done by the adsorption method. Fly ash, solid waste from coal combustion, can be utilized as a dye adsorbent. Modification of fly ash with alkali (NaOH solution) and magnetite (Fe3O4) can increase the adsorption capacity and facilitate separation. In this paper, fly ash was modified with alkali and magnetite and then applied as an adsorbent for naphthol blue black (NBB) dye.
The effect of fillers: cobalt ferrite (CoFe2O4) nanoparticle and various types of surfactants on the structure of the obtained ferrite-filled polymer composites and their adsorption and catalytic properties towards organic dyes in the Fenton system was investigated. Ferrite-polymer composites based on triethylene glycol dimethacrylate (TGM-3) and pre-synthesized cobalt ferrite (CoFe2O4) nanoparticles with notable magnetic properties were obtained via in situ photoinitiated free radical polymerization.
The adsorption of phenol, 4-chlorophenol, methylene blue, and Pb(II) by coal-based activated carbons prepared by a thermal shock alkaline activation was studied for the first time. The adsorption kinetics and isotherms were measured and compared with those of carbons obtained by a temperature-programmed activation. The adsorption rate was determined to be limited by the interaction of adsorbate with surface centers, and not by the diffusion into pores.
The sorption capacity of polymer blends was analyzed on the basis of absorption kinetics. The study was carried out in an adsorption-active medium with different degrees of deformation. Heptane and butanol were used as adsorption-active media. The influence of the chemical nature of the adsorbate on the sorption process was studied. The free volume fractions for each sample of the composition were calculated. The ability of materials to absorb different amounts of substances allows us to identify the behavior peculiarities of the interfacial regions of different chemical compositions.
The porous coordination polymers were prepared from Zn2+ and oxalic acid with 2 linker ligands, 1,2,4-triazole (Taz) and 3-amino-1,2,4-triazole (ATaz). The adsorption of N2 after adsorption of degassed CO2 in the pore frameworks increased by 3 times. The flexibility of this structure is due to the interaction of CO2 molecules with the amine groups contained in it, thereby increasing its porosity.
The methods of wastewater treatment from heavy metal ions and dyes are analyzed, and the key advantages of powdered magnetically sensitive carbon nanocomposites as adsorbents are shown. Methods for selecting and preparing raw materials and activators for the synthesis of such nanocomposites are considered, and methods for synthesizing nanocomposites are analyzed. The properties, modeling of adsorption kinetics and isotherms, and efficiency of magnetic carbon nanocomposites for wastewater treatment from dyes and heavy metals are described.
The article is dedicated to the problem of decarbonising industrial gas emissions using adsorption methods. The article examines promising approaches to reducing carbon dioxide (CO₂) emissions using adsorption materials with high selectivity and efficiency in capture processes. The purpose of the study is to determine the adsorption capacity of various types of adsorbents, including synthetic and natural materials, in particular, fly ash synthesised by the hydrothermal method, zeolite obtained by the sintering method, natural zeolite, and fly ash from thermal power plants.
The paper presents the results of the $Cu^{2+}$ adsorption on natural and thermally/microwave-treated clinoptilolite and glauconite. XPS experiments were performed. The relationship between the adsorbed matter and the equilibrium concentration in wastewater is described by four two-parameter isotherm models and four three-parameter adsorption isotherm models.