Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Comparison of the Physicochemical Characteristics of the Manganese-coated Sand Prepared by Wetting and Dry Methods with Baking Method

소성 및 접촉건조 방식에 의해 제조된 망간코팅사의 물리화학적 특성 비교

  • Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University) ;
  • Kim, Byeong-Kwon (Department of Environmental Engineering, Kwangwoon University) ;
  • Hong, Soon-Chul (Department of Environmental Engineering, Kwangwoon University) ;
  • Seo, Eun-Ok (Department of Environmental Engineering, Kwangwoon University) ;
  • Yang, Jae-Kyu (Department of Environmental Engineering, Kwangwoon University)
  • Published : 2007.11.30
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Abstract

Physicochemical characteristics of the manganese-coated sand(MCS) prepared by wetting and dry(W&D) method were compared with that by baking method, which is previously used. Particle sizes of the sand and wetting times were used as variables in the preparation of MCS and an optimum condition for the preparation MCS by W&D was determined from the resting efficiency, preparation time und oxidation efficiency of As(III). Comparing the X-ray diffraction spectroscopy(XRD) peak information of manganese oxide prepared by W&D method with the JCPDS file, the peaks were identified as the mixture of ${\beta}-MnO_2\;and\;{\gamma}-MnO_2$. The MCS prepared b) W&D method showed similar oxidizing powers to As(III) compared to that by baking method. However, the stability of the manganese on MCS prepared by W&D method was greater than that by baking method. From this work, wetting and dry was identified as an efficient preparation method in the view point of rented amount of manganese on sand, stability of coated manganese and oxidation efficiency of As(III).

본 연구에서는 접촉 및 건조 방법으로 만든 망간사의 물리화학적 특성을 기존의 소성처리 방법으로 만들어진 망간사의 그것과 비교하였다. 접촉 및 건조방법을 사용하여 망간사를 제조할 때에 모래 입경별 및 접촉시간을 제조변수로 하였으며 접촉 및 건조방법에 의한 망간사 제조시의 최적조건은 망간 코팅효율, 제조시간, As(III)에 대한 산화효율로부터 도출하였다. X-선 회절분석을 통하여 접촉 및 건조방법에 의해 제조된 망간사 표면의 산화망간에 대한 광물 분석결과를 JCPDS 자료와 비교한 결과 ${\beta}-MnO_2$와 ${\gamma}-MnO_2$의 혼합물인 것으로 판명되었다. 접촉 및 건조방법으로 제조한 망간사는 기존의 소성처리 방법으로 제조한 망간사에 비해 As(III) 산화효율은 유사하지만 코팅된 망간의 안정성이 보다 큰 것으로 나타났다. 접촉 및 건조방법은 코팅된 망간함량, 코팅된 망간의 안정도 그리고 As(III)에 대한 산화성능 등을 고려할 때 기존의 망간사 제조방법을 대체할 수 있는 우수한 제조공정으로 나타났다.

Keywords

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