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In this study removal of boron from aqueous solutions by adsorption was investigated and experimental design was applied. Cerium oxide was used as adsorbent. In the first part of study 3 parameters effect performance and two levels of these parameters were investigated. Parameters that were chosen temperature (20 and 40°C), particle type (granule and powdered) and initial pH of boron solution (6.18 and 10). In the second part of the study linear law Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. Maximum boron removal was obtained at original pH value of boron solution and 40°C using powdered cerium oxide. It was verified that temperature, temperature-particle type, pH-particle type-temperature variables had influence on the boron adsorption at the level of 5% probability. The influence order was temperature > temperature-particle type > pH-particle type-temperature.

The major conclusions derived from the present work are • The parameters affecting adsorbed boron amount are given as temperature, temperatureparticle type, pH-particle type-temperature at the level of 5% probability. • Maximum boron removal was obtained at original pH value of boron solution and 40°C by powdered cerium oxide. • Linear law is obeyed better than Freundlich and Langmuir isotherms.