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논문 기본 정보

자료유형
학술저널
저자정보
김우항 (목포해양대학교)
저널정보
한국환경기술학회 한국환경기술학회지 한국환경기술학회지 제20권 제3호
발행연도
2020.1
수록면
179 - 187 (9page)

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Waste oyster shells that are causing some environmental problems are needed to be reused as adsorption material. This study was to investigate the cadmium sorption of pre-treated oyster shells. It was confirmed that main component of pre-treated oyster shells were changed from calcite to calcium oxide and calcium phosphate by XRD. Removal efficiencies of cadmium for POS, COS and OS were 99 %, 96 % and 90 % at 1 g/L of sorbent dosage. Removal efficiency of cadmium for POS was not affected by variation in pH whereas its removal efficiencies for OS and COS were strongly affected at low pH. General trend of cadmium removal efficiency at changing of sorbents amount occurred in the following order: POS > COS> OS. Kinetic models were well fitted to pseudo-second order with R2 values of 1.00 at the all the sorbents. These adsorptions appear to follow the Langmuir isotherm very well with the range of 0.992 ~ 0.999 of correlation coefficients. It can be said cadmium was removed by the monolayer adsorption on the surface of the POS because the Langmuir model gave a better fit of the data than that of the Freundlich model for POS. The maximum adsorption capacity (qmax) was increased more than 2 times for COS and more than 4 times for POS. These results show that oyster shells with calcination (COS) and phosphoric acid treatment (POS) can be good adsorbents for cadmium removal.

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