###### Abstract  
This article presents the synthesis and sorption characteristics of novel microspheres based on 4-vinylbenzene chloride (VBCI) with divinylbenzene (DVB) or ethylene glycol dimethylacrylate (EGDMA). To confirm the chemical structure of the homo- and co-polymers attenuated total reflectance, Fourier transform infrared spectroscopy (ATR-FTIR) was used. The presence of characteristic functional groups (\(-\)OH, \(-\)CH, \(-\)CH\({}_{2}\), C\(-\)O, C\(=\)O and C\(-\)O-C) in obtained microspheres was confirmed. Differential scanning calorimetry (DSC) analysis confirms the good thermal resistance of the polymers. The decomposition of microspheres is closely related to the chemical structure of the monomers used. DVB-derived materials decompose in one step, whereas the decomposition of EGDMA derivatives is multi-stage. Obtained polymeric microspheres were applied for auramine O (AO) basic dye removal form aqueous solutions. Equilibrium studies confirmed that the Freundlich model described the system better than Langmuir or Temkin equations and the adsorption capacities \(k_{\mathrm{F}}\) ranged from 4.56 to 7.85 mg\({}^{1-1/n}\) L\({}^{1/n}\)/g. The sorption kinetic of AO from solutions of the 10 and 100 mg/L concentrations was very fast, and after 10 min, equilibrium was reached. Keywords:4-vinylbenzene chloride; polymeric microspheres; auramine O; dyes sorption; textile wastewaters +
Footnote †: journal: _Proccesses_  
technological processes of wastewater treatment, and is also necessary for the optimization of sorption processes for specific real-world conditions and in the design of new, effective and economical sorbents [12]. The continual tightening of permissible pollutant concentration limits has meant that work on assessing the properties of adsorbents is currently very intensive, as evidenced by the extensive literature [11; 12; 13; 14]. The present study is also part of this research. Polymer resins used in wastewater treatment processes are commonly prepared from the styrene and varying amounts of a crosslinking agent, most commonly divinylbenzene [15], which controls the porosity of the particles. Popular resins available on the market are acrylic [16], epoxy or phenol-formaldehyde [17] type. A common choice is between styrene-divinylbenzene copolymer and acrylic-divinylbenzene copolymer [15; 16; 17]. Polymeric microspheric sorbents based on divinylbenzene-crosslinked styrene, despite their many advantages including stability over the whole pH range, also have some limitations due to their hydrophobic nature. Structural characteristics (i.e., porosity) aside, the styrene matrix is stronger than the acrylic one, but it is less flexible than the more rigid styrene-based copolymer. The elasticity of the acrylic matrix is a desirable characteristic when it concerns the kinetics of contaminant adsorption, but it can be somewhat problematic when resin columns are subjected to wastewater flowing under significant pressure. In addition, polystyrene resins are more resistant to high temperatures than acrylate-based resins. However, an important feature of polyacrylic resins is their resistance to organic fouling. An attempt to synthesize a new resin based on hydroxypropylmethacrylate-co-ethylenediylomethane-co-glycolidylmetharylate) terpolymer (HPMA-co-EGDMA-co-GMA via suspension polymerization for the removal of disperse dyes was undertaken by [PERSON] et al. [18]. Poly(chlorobenzalimino thiourea amide) (PCBA) resin was synthesized by using the phosphorilation polycondensation method not only for dyes (methyl orange and acid orange) but also heavy metal ions (Ni\({}^{2+}\) and Zn\({}^{2+}\)) removal [19]. Chelating resin poly(MMA-co-MA) was synthesized by radical polymerization of maleic anhydride (MA) and methyl methacrylate (MMA) and applied for azo dyes (Acid Yellow 42, acid Red 151 and Methylene Blue 9) removal [20]. The aim of our research was to obtain novel polymeric microspheres with a more hydrophilic character by using the suspension polymerization method.