## 1 Introduction  
The development of industry and technology has contributed to the increase in demand for materials with well-defined characteristics and combining several features of different solids in one type of structure [1; 2; 3]. Hybrid organic-inorganic materials are the answer to the growing needs of the material market [4; 5]. One of the most important actual challenges in designing these combined systems is how to keep or increase the best properties of each component while rejecting or decreasing their limitations [6]. Organic-inorganic materials based on a polymer matrix are some of the most frequently obtained types of hybrid systems because of their ease of synthesis and further modification [7; 8].  
Generally, polymers have many desirable physical properties including tensile strength, modulus, toughness, or viscoelasticity. Nevertheless, because of their worse mechanical and thermal properties in comparison to metals or ceramics, numerous polymers have restricted use in engineering applications [9; 10]. The mechanical and thermal properties of polymers can be improved by combining them in organic-inorganic systems. The connection between the polymer and the inorganic phase improves its strength and toughness. Moreover, the inorganic component provides the mechanical and thermal stability and usually leads to many other desired chemical and physical properties of the hybrid materials [11; 12; 13; 14; 15].  
Hybrid organic-inorganic materials with spherical shapes (microspheres) can be prepared by different methods (polymerization, extraction, dispersion, solvent evaporation or emulsion techniques). In this work the suspension polymerization method was used to obtain polymer-silane microspheres. Generally, suspension polymerization is a reaction in which a monomers mixture with an initiator is dispersed in a continuous aqueous phase with the addition of a small amount of a suspension agent (stabilizer) [16; 17; 18]. The method as well as conditions of synthesis reaction have an influence on the properties of polymer-inorganic microspheres. The adsorption properties of hybrid microspheres result from their porous structures which develop during the polymerization reaction. The amounts, shapes and sizes of pores depend on pore-forming diluents applied to expand the polymer matrix, however, the major factor in developing the surface area is the crosslinking agent (the higher amount of crosslinker, the higher the surface area) [19; 20; 21; 22].  
Water is an essential compound used for many purposes, from drinking to industrial processes. Both drinking and industrial water must in many cases be treated before use due to the presence of various harmful contaminants [23; 24; 25]. Among the different wastewater treatment methods, adsorption is widely used because of its simplicity, good treatment efficiency, the availability of a wide variety of adsorbents, and relatively low costs. Aliphatic or aromatic organic substances including aldehydes, amines, nitrides, pesticides, pharmaceuticals and dyes are generally compounds that are difficult to decompose in water [26; 27; 28; 29; 30; 31; 32]. Therefore, the development of effective, inexpensive and selective sorbents is a crucial issue. Traditional sorbents may have many limitations: they can be susceptible to contamination and microbial growth, they may have poor mechanical and thermal stability, not enough efficiency and short life-time. The solution is to combine several solids in one in order to obtain materials with improved properties [25; 29].