Research of protective and operational properties of sorption-filtering textile material

The article presents the results of a study on the functionalisation of synthetic textile materials with spherical activated carbon using an adhesive to create personal protective equipment based on Russian components. These materials are of particular relevance in the production of sorption and filtering personal protective equipment, which must have, along with high protective characteristics, high performance properties, vapour and air permeability. In the course of the work, the influence of the plasma of a capacitive high-frequency and low-pressure discharge on the modification of the base material was investigated. It has been proven that plasma treatment of polyester nonwoven material accelerates sorption processes, ensures uni-form coverage of fibres with a binder, which allows maintaining the material's air permeability. The results of studies of the material for the time of protective action on ammonia demonstrated the prospects for the development of Russian sorption-filtering textile material on a non-woven polyester base with a monolayer of granular activated carbon fixed on a polymer binder.

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Carboxylic acids are the main pollutant of industrial wastewater during the Advanced Oxidation Process (AOPs). In this study, we here study a resin-based spherical activated carbon (RSAC, AF5) as an adsorbent and use acetic acid as a model substrate for adsorption investigation. The pH = 3, temperature = 298 K were fixed by batch technique. The pseudo-second-order kinetic model, the intraparticle and external models are fitted well, and it was found that the adsorption of acetic acid onto AF5 was controlled by liquid film diffusion. Freundlich model indicates the adsorption process is heterogeneous multi-molecular layer adsorption on the surface. AF5 shows good regenerative ability; the recovery rate of adsorption capacity is ∼88% after 5 cycles. And COD adsorption removal rate can be maintained 100% for over 35 h in an actual AOPs effluent, and it can be eluted for 100% after 8 h by 0.8wt% NaOH. The characterizations, including XRF, XRD, TG/DSC,FTIR, SEM and N2 adsorption, show that the excellent adsorption performance is mainly due to the microporous structure and large specific surface area (1,512.88 m2/g), the adsorption mechanism mainly including pore filling effect and electrostatic attraction. After five adsorption-recycles, AF5's pore characteristic does not change significantly. This study provided a scientific basis for the wastewater standard discharge process of AOPs coupled adsorption.

Simultaneous Adsorption of Phenol Derivatives from Water Onto Spherical Activated Carbon

The paper examines single- and multicomponent adsorption onto granular activated carbon. The quantities adsorbed in the study were determined using HPLC with UV detection. The experimental data were analysed using the Langmuir, the Freundlich and the Sips adsorption isotherms. With a single component being adsorbed, high coefficients of determination and low mean square errors indicated that the Sips isotherm fitted the adsorption equilibrium well. Further experiments were carried out using aqueous solutions containing two or three adsorbed components in different proportions. For these solutions, the literature methods of predicting multicomponent equilibrium using single-component data did not yield positive results. Assuming that in the investigated range of concentrations no competitive adsorption occurred, the authors propose a method for calculating the equilibrium concentrations in the liquid phase using the equations obtained for individual components. The results achieved correspond very well to the experimental data.

Sulphur-doped activated carbon as a metal-free catalyst for acetylene hydrochlorination

A series of sulfur-doped spherical activated carbon (SAC) catalysts were prepared with phenyl disulfide (C12H10S2) as a sulfur source for acetylene hydrochlorination.