Adsorption of Rhodamine-B from Aqueous Solution Using APTMS and GPTMS Modified Silica Sorbents

Dilsad Dolunay Eslek Koyuncu, Mujgan Okur

Abstract


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.


Keywords


Rhodamine-B; Adsorption; APTMS; GPTMS; Paddy waste ash

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References


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