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마그네타이트 입자에 비소(V)의 흡착을 위한 충전식 컬럼 및 연속 흐름식 반응조
( San Phearom ),( Muhammad Kashif Shahid ),최영균 ( Younggyun Choi ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Arsenic being groundwater is a major concern in most parts of the world. This study focuses the arsenate removal from contaminated water using synthesized magnetite particles. The common methods for the treatment of arsenate-contaminated water include membrane filtration, coagulation-filtration precipitation, ion exchange, and adsorption. In this research, magnetite particles were synthesized by co-precipitation method from raw mill-scale (Muhammad et al., 2019). Mill scale is a waste obtained during hot rolling of steel in steel industries. In an earlier study, we have successfully synthesized magnetite particles from the mill scale (Muhammad et al., 2018). 100g of Mill scale (45-75μm) was added in 500mL sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) and kept on continuous stirring at 70°C for 48h. The obtained ferrous precursor was dissolved in deionized water later, the mixture was filtered and added into the alkaline medium (0.3N NaOH). The pH of alkaline medium was 13.0 that was dropped at 8.3±2, when precursor was added. Black magnetite particles were formed at the bottom of the beaker and were collected. The particles were rinsed with deionized water several times and were dried under sunlight. The characterization of the synthesized magnetite is done with XRD, FTIR, SEM and EDS. The XRD spectrum of the synthesized magnetite particles was found in good agreement with the Joint Committee for Powder Diffraction Standards (JCPDS) no. 19-0629. The adsorptive behavior of magnetite is assessed with a series of experiments with varying initial arsenate concentration, pH and contact time. The effect of initial concentration of arsenate on adsorption by magnetite particles is investigated at various concentrations (0.5-60mg per liter of solution). The effect of pH on the arsenate adsorption was investigated by adjusted pH 2 to 10 of the arsenate solutions. The arsenic (V) adsorbed on the surface of mill scale-derived magnetite particles was desorbed by using 0.2 N NaOH for 2h contact time at continuous stirring. In this study, the maximum adsorption capacity is achieved 12.7mg/g. The arsenate take up capability of magnetite is investigated with different column and bath reactors. About 12.7ng of arsenic was adsorbed onto 1g of magnetite. The column reactors and PFR showed over 90% arsenate removal efficiencies. The mechanism of adsorption of As(V) ion onto magnetite proceeds from the formation of OH on the surface of the magnetite, followed by the replacement of hydroxide anion by the As(V) ion in aqueous media.