Preparation of SiO2/Nb2O5/ZnO mixed oxide by sol–gel method and its application for adsorption studies and on-line preconcentration of cobalt ions from aqueous medium

Synthesis and evaluation of different adsorbents based on poly(methacrylic acid–trimethylolpropane trimethacrylate) and poly(vinylimidazole–trimethylolpropane trimethacrylate) for the adsorption of tebuthiuron from aqueous medium

“…The obtained results in Table 3 indicated that pseudo-second order model provides an adequate description of adsorption kinetics of tebuthiuron on PVI and PMA, which is confirmed by high regression coefficients of 0.999. This model recognizes that the reaction rate is dependent on the amount of solute adsorbed at surface of the adsorbent and the occupancy rate of the adsorption sites is proportional to the square of the number of unoccupied sites; assumes the presence of binding sites with different energies and presupposes that retention of adsorbate onto adsorbent is controlled by means of a process of chemical nature [36][37][38].…”

Recent advances and future trends in new materials for sample preparation

“…Diniz et al [47] synthesized a SiO 2 /Nb 2 O 5 /ZnO adsorbent via the sol-gel method for extraction of cobalt ions from water and food. The material was used for chelatingagent-free SPE in on-line preconcentration using a miniaturized packed column followed by FAAS analysis.…”

Preparation and evaluation of a mesoporous calcium-silicate material (MCSM) from coal fly ash for removal of Co(II) from wastewater

“…Cobalt and its salts are in widespread use in the manufacture of alloys, batteries, magnetic and stainless steel products, enamels and semiconductors, catalysts for organic chemical reactions and paint pigments (e.g., on glass, porcelain, hygrometers and electroplating) [1]. Moreover, cobalt and its salts are used in nuclear medicine, grinding wheels, as a foam stabilizer and as a desiccant in the food industry [2].…”