Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Photo-oxidation of Aqueous Humic Acid using TiO2 Sols-Characterization of Humic Acid in the Chemical Oxidation Treatment(I)-

TiO2 졸을 이용한 수중 Humic Acid의 광산화-화학적 산화법에 의한 부식산의 분해처리 기술에 관한 연구(I)-

  • Seok, Sang Il (Advanced Materials Division. Korea Research Institute of Chemical Technology) ;
  • Ahn, Bok Yeop (Advanced Materials Division. Korea Research Institute of Chemical Technology) ;
  • Kim, Mi Sun (Advanced Materials Division. Korea Research Institute of Chemical Technology) ;
  • Suh, Tae Soo (Advanced Materials Division. Korea Research Institute of Chemical Technology) ;
  • Rhee, Dong Seok (Department of Environmental Engineering, Kangwon National University)
  • 석상일 (한국화학연구소 화학소재 연구부) ;
  • 안복엽 (한국화학연구소 화학소재 연구부) ;
  • 김미선 (한국화학연구소 화학소재 연구부) ;
  • 서태수 (한국화학연구소 화학소재 연구부) ;
  • 이동석 (강원대학교 환경공학과)
  • Received : 2000.02.07
  • Accepted : 2000.03.17
  • Published : 2000.06.30
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Abstract

The photo-oxidation of an aqueous humic acid solution using $TiO_2$ sols. which is transparent in visible range, was studied. The $TiO_2$ sols were prepared by a process wherein hydrogen peroxide was added to a gel of $TiO(OH)_2$ originated from hydrolysis of $TiCl_4$, and the resulting titanium peroxo solution(TPS) was heated. The concentration of $TiO_2$ used for photo-oxidation was about 100ppm, determined by comparing the photoluminescence(PL) intensity measured as a function of $TiO_2$ concentration. $TiO_2$ sols aged at $100^{\circ}C$ for more than 12h were found to exhibit a maximum rate in photocatalytic decomposition of humic acid. and the efficiency was better than that of Degussa P25. In addition, the resulting aqueous humic acid after photocatalytic decomposition with sols had an excellent transmittance of visible light, while that treated with Degussa P25 was still turbid. caused by $TiO_2$ particles.

가시광 영역에서 투명한 $TiO_2$ 졸을 이용하여 수중 humic acid의 광분해 특성을 고찰하였다. $TiO_2$ 졸은 $TiCl_4$ 용액의 가수분해 침전물인 $TiO(OH)_2$를 $H_2O_2$와 반응시켜 titanium peroxo solution (TPS)을 제조한 후, 이 용액을 온도와 시간의 함수로 열처리하여 제조하였다. Humic acid의 광분해를 위하여 사용된 졸의 적정 농도는 100ppm 전 후이었으며, photoluminescence(PL)를 이용하여 결정되었다. $TiO_2$ 졸의 humic acid에 대한 광촉매 효능은 TPS를 $100^{\circ}C$에서 12시간 이상 열처리한 졸을 이용할 때 가장 높았으며, 상용되고 있는 Degussa P25 보다 우수한 것으로 나타났다. 또한 상용의 분말로부터 유도된 현탁 반응은 처리수가 $TiO_2$로 인해 높은 탁도를 나타내는 반면, TPS로부터 유래한 졸은 거의 탁도를 나타내지 않고 높은 투명성을 보였다.

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