Özet:

In this study, modified silica sorbents were used as sorbents in the adsorption of Rhodamine-B from aqueous solution. Modified silica sorbents were prepared by sol-gel method using paddy waste ash as a silica source. APTMS ((3-Aminopropyl)trimethoxysilane) and GPTMS ((3-Glycidyloxypropyl)trimethoxysilane) were used as modification agents and prepared samples in this way were denoted as Silica-A and Silica-G, respectively. Prepared sorbents were characterized by FT-IR, SEM, N2 adsorption-desorption, and zeta potential analyses. The adsorption experiments were conducted under initial pH values between 4 and 12, at 30oC with a dye concentration of 10 mg/L, 0.05 g sorbent amount (working volume of 50 mL), and 100 rpm shaking rate in a batch system. The highest dye removal percentage was obtained at pH 4 for both sorbents. The dye removal percentage of Silica-A and Silica-G sorbents were found as 17.5 % and 32.1 %, respectively. As the initial pH increased the dye removal percentage decreased. These results demonstrated that GPTMS-modified silica sorbent can be used in the adsorption of Rhodamine-B dye from an aqueous solution.

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