Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Mitigations of Natural Organic Matter Fouling of Polyethersulfone Microfiltration Membrane Enhanced by Deposition of $TiO_2$ Nanoparticles

$TiO_2$ 나노입자로 표면침적된 Polyethersulfone 정밀여과 분리막의 자연유기물 파울링 감소

  • Chang, Jung-Woo (Department of Environmental Engineering, Inha University) ;
  • Ahn, Kyung-Min (Department of Environmental Engineering, Inha University) ;
  • Kim, Ki-Hyun (Department of Environmental Engineering, Inha University) ;
  • Khan, Sovann (Department of Environmental Engineering, Inha University) ;
  • Kim, Jeong-Hwan (Department of Environmental Engineering, Inha University)
  • 장정우 (인하대학교 사회기반시스템공학부 환경공학과) ;
  • 안경민 (인하대학교 사회기반시스템공학부 환경공학과) ;
  • 김기현 (인하대학교 사회기반시스템공학부 환경공학과) ;
  • 칸소완 (인하대학교 사회기반시스템공학부 환경공학과) ;
  • 김정환 (인하대학교 사회기반시스템공학부 환경공학과)
  • Received : 2010.06.09
  • Accepted : 2010.06.16
  • Published : 2010.06.30
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Abstract

In this study, the effect of surface deposition of $TiO_2$ nanoparticles at polyethersulfone (PES) microfiltraiton (MF) membrane on humic acid fouling was investigated. The effect was observed as a function of crystal structures of $TiO_2$ nanoparticles and solution chemistries including pH and divalent cation such as calcium. Our results showed clearly that $TiO_2$-deposited membrane could mitigate membrane fouling significantly. However, this effect was observed to be dependent upon crystal structures of $TiO_2$ nanoparticles and solution chemistries. In the absence of calcium, fouling mitigation was less pronounced for both anatase and hybrid $TiO_2$-deposited membrane than for rutile $TiO_2$-deposited membrane while opposite trend was observed after addition of calcium. In the presence of calcium, the adsorption of humic acid to $TiO_2$-deposited membrane can be reduced by electrostatic repulsions between humic acid and $TiO_2$ surface. Addition of calcium provided further beneficial effect on fouling mitigation particularly at higher pH for the anatase $TiO_2$ deposited membrane, implying that both increased hydrophilicity due to $TiO_2$ nanoparticles and negative surface charge of the membrane should affect fouling mitigation. However, rutile $TiO_2$ having more inertness generally than the anatase $TiO_2$ showed relatively robust effect on the fouling mitigation regardless of solution properties.

본 연구에서는 $TiO_2$ 나노입자로 표면침적된 polyethersulfone (PES) 정밀여과 분리막이 자연유기물로 인한 분리막 막힘현상(파울링)에 미치는 영향을 관찰하였다. $TiO_2$ 나노입자로 표면침적된 PES 정밀여과 분리막의 자연유기물 파울링 거동에 $TiO_2$ 나노입자의 결정구조와 용액의 pH 그리고 $Ca^{+2}$이 미치는 영향을 관찰하였다. 연구결과, $TiO_2$ 나노입자로 표면 개질된 정밀여과 분리막은 자연유기물에 의한 파울링 현상을 현저하게 감소시킬 수 있음을 확인 할 수 있었다. 그러나 이와같은 현상은 $TiO_2$ 나노입자의 결정구조와 용액의 성상에 매우 의존하는 것으로 나타났다. 자연유기물 파울링의 감소는 결정구조가 상대적으로 불안정한 anatase $TiO_2$ 나노입자를 분리막에 표면침적 시, 용액 중 $Ca^{+2}$이 존재하지 않을 때 상대적으로 높은 pH에서 효과적인 것으로 관찰되었다. 그러나 $Ca^{+2}$의 첨가 시 이와 같은 효과는 높은 pH에서 더욱 증가할 수 있음을 확인할 수 있었다. 반면, 결정구조가 상대적으로 안정한 rutile $TiO_2$ 나노입자의 경우 자연유기물의 파울링 감소는 용액의 조성에 큰 영향을 받지 않는 것으로 나타났다.

Keywords

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