물에 분산된 광촉매 TiO₂ 분말에 대하여, 광촉매 활성도에 영향을 미치는 여러 실험조건과 광촉매 분해능과의 상관관계를 여러 제조사의 광촉매 분말에 대하여 관찰하였다. 수용상의 pH와 유기물 분해능의 상관관계에 있어서 pH 5-7에서 분해율이 가장 높게 나타났으며 그 외 pH 영역에서는 유기물 분해율이 크게 감소하였다. 수용상에 존재하는 음이온과 양이온은 그 이온농도와 광촉매 종류에 따라서 분해율이 달라짐을 보여주었다. 용존 산소는 전자를 제거하는 효과로 추측되는 현상으로 인하여 광분해 효율을 증가시켰으며, 조사되는 UV 광원의 파장에 따라 광촉매 시료들에 대한 유기물 분해율 특성은 영향을 받았다. 본 연구에 사용된 특정한 광촉매 시료는 분해 유기물의 종류 및 실험조건에 상관없이 항상 우월한 유기물 분해능을 보여주지 않아, 수용상에 분산된 광촉매 분말의 유기물 분해반응은 그 광촉매가 접하는 실험 환경에 따라 매우 민감하게 분해능이 달라짐을 알 수 있었다.

With respect to the photocatalytic TiO₂ powder dispersed in the water, the relationship between the experimental conditions influencing photocatalytic activities and the degree of decomposition were examined for the various sources of photocatalytic powder. For the relationship between pH and level of organic decomposition, a high degree of decomposition was shown in the range of pH 5 to 7, whereas the activity was significantly reduced out of the range. The cations and anions contained in the slurry also affected the decomposition depending on their concentrations and the sources of photocatalytic TiO₂ powder. Dissolved oxygen enhanced the degree of decomposition. This might be due to the effect of oxygen acting as an electron scavenger. The destruction yields of 4CP with the photocatalytic TiO₂ powders were affected by the wavelength of irradiated UV light on the TiO₂ powder. One particular source of TiO₂ powder has not always shown superior activities irrespective of kinds of target organics and experimental conditions. These showed that the degree of organic decomposition by the photocatalytic TiO₂ powders dispersed in the water varied significantly, depending on the environmental conditions the photocatalyst was surrounded.

Photocatalytic TiO₂ Organic Decomposition Experimental Conditions pH Kind of Waters Kind of Organics Dissolved Oxygen Cation and Anion UV Light

Serpone N, Pelizzetti E, Photocatalysis, Fundamentals and Applications, John Wiley and Sons., N.Y. (1989)
Lu GQ, Linsebigler A, Yates JT, J. Phys. Chem., 98(45), 11733 (1994) 
Kurtz RL, Stockbauer R, Madey TE, Surf. Sci., 218, 178 (1989) 
Bourgeois S, Jomard F, Perdereau M, Surf. Sci., 279, 349 (1992) 
Hugenschmidt MB, Gamble L, Campbell CT, Surf. Sci., 302, 329 (1994) 
Pelizzetti E, Minero C, Electrochim. Acta, 38, 47 (1993) 
Smith PB, Bernasek SL, Surf. Sci., 188, 241 (1987) 
Yang T, Wan W, J. Photochem. Photobiol. A-Chem., 69, 241 (1992) 
Muraki H, Saji T, Fujihira M, Aoyagui S, J. Electroanal. Chem., 169, 319 (1984) 
Matsumoto Y, Shimuzu T, Sato E, Electrochim. Acta, 27, 419 (1982) 
Bard AJ, J. Photochemistry., 10, 59 (1979) 
Jung KY, Park SB, Appl. Catal. B: Environ., 25(4), 249 (2000) 
Zane D, Decker F, Razzini G, Electrochim. Acta, 38, 37 (1993) 
Gerischer H, Electrochim. Acta, 38, 3 (1993) 
Litter MI, Appl. Catal. B: Environ., 23(2-3), 89 (1999) 
Hagfeldt A, Gratzel M, Chem. Rev., 95(1), 49 (1995) 
Kim KW, Lee EH, Kim YJ, Lee MH, Kim KH, Shin DW, HWAHAK KONGHAK, 41(2), 152 (2003)
Kim KW, Lee EH, Kim YJ, Lee MH, Shin DW, HWAHAK KONGHAK, 41(2), 160 (2003)
Kim KW, Lee EL, Kim YJ, Lee MH, Shin DW, J. Photochem. Photobiol. A-Chem., 161, 11 (2003) 
Kim KW, Lee EL, Kim YJ, Lee MH, Kim KH, Shin DW, J. Photochem. Photobiol. A-Chem., 159, 301 (2003) 
Vinodgopal K, Wynkoop DE, Kamat PV, Environ. Sci. Technol., 30(5), 1660 (1996) 
Anpo M, Aikawa N, Kubokawa Y, J. Phys. Chem., 88, 3998 (1984) 
Pelizzetti E, Maurino V, Minero C, Carkin V, Pramauro E, Zerbinati O, Tosato ML, Environ. Sci. Technol., 24(10), 1559 (1990) 
Jacoby WA, Nimlos MR, Blake DM, Environ. Sci. Technol., 28(9), 1661 (1994) 
Dibble LA, Raupp GB, Environ. Sci. Technol., 26(3), 492 (1994) 
D'Oliveira JC, Al-Sayyed G, Pichat P, Environ. Sci. Technol., 24(7), 990 (1994) 
Matthews RW, J. Phys. Chem., 92, 6853 (1988) 
Theurich J, Linder M, Bahnemann DW, Langmuir, 12(6), 6368 (1996)