토양광물 표면의 흡착으로 인한 수용액상의 Silver 제거특성 (Removal characteristics of silver from aqueous solutions by adsorption on soil mineral surfaces)

서지정보

· 발행기관 : 한국수처리학회
· 수록지 정보 : 한국수처리학회지 / 17권 / 4호 / 19 ~ 27페이지
· 저자명 : 임수빈

초록

The adsorption characteristics of Ag(Ⅰ) on three different mineral surfaces of kaolinite, quartz, and vermiculite were examined to investigate the geochemical behavior of Ag(Ⅰ) in contaminated sites near abandoned mines. The Freundlich constant, KF values for kaolinite, quartz and vermiculite were 0.132, 0.004, and 0.147 (mg1-1/n·L1/n/g) at pH 7.0 and 0.119, 0.003, and 0.056 (mg1-1/n·L1/n/g) at pH 4.0, respectively. The Freundlich constant, 1/n values were 0.553, 0.747, 0.437 at pH 7.0 and 0.131, 0.652, 0.522 1/n at pH 4.0, respectively. The order of mineral adsorption capacity for Ag(Ⅰ) at pH 7.0 was determined to be vermiculite > kaolinite > quartz. This result suggests that the mineral with higher Cation Exchange Capacity (CEC) has larger adsorption capacity of Ag(Ⅰ) than minerals with lower CEC. At pH 4.0 condition, the order of mineral adsorption capacity of Ag(I) was measured to be kaolinite > vermiculite > quartz. The higher adsorption capacity of kaolinite than vermiculite at pH 4.0 might result from the fact that the surface sites of vermiculite are dominantly positively-charged while those of kaolinite are slightly positively-charged at pH 4.0. The solution pH and CEC of mineral might be important physicochemical factors that could remarkably affect the adsorption behavior of Ag(Ⅰ) on mineral surfaces. The surface area of mineral has no significant effect on the adsorption of Ag(Ⅰ) to mineral surfaces.

영어초록

The adsorption characteristics of Ag(Ⅰ) on three different mineral surfaces of kaolinite, quartz, and vermiculite were examined to investigate the geochemical behavior of Ag(Ⅰ) in contaminated sites near abandoned mines. The Freundlich constant, KF values for kaolinite, quartz and vermiculite were 0.132, 0.004, and 0.147 (mg1-1/n·L1/n/g) at pH 7.0 and 0.119, 0.003, and 0.056 (mg1-1/n·L1/n/g) at pH 4.0, respectively. The Freundlich constant, 1/n values were 0.553, 0.747, 0.437 at pH 7.0 and 0.131, 0.652, 0.522 1/n at pH 4.0, respectively. The order of mineral adsorption capacity for Ag(Ⅰ) at pH 7.0 was determined to be vermiculite > kaolinite > quartz. This result suggests that the mineral with higher Cation Exchange Capacity (CEC) has larger adsorption capacity of Ag(Ⅰ) than minerals with lower CEC. At pH 4.0 condition, the order of mineral adsorption capacity of Ag(I) was measured to be kaolinite > vermiculite > quartz. The higher adsorption capacity of kaolinite than vermiculite at pH 4.0 might result from the fact that the surface sites of vermiculite are dominantly positively-charged while those of kaolinite are slightly positively-charged at pH 4.0. The solution pH and CEC of mineral might be important physicochemical factors that could remarkably affect the adsorption behavior of Ag(Ⅰ) on mineral surfaces. The surface area of mineral has no significant effect on the adsorption of Ag(Ⅰ) to mineral surfaces.

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