TiO₂을 각각 0.17, 0.34, 0.5 wt% 함유시킨 피치계 산화섬유를 제조하고 이를 탄화 및 수증기 활성화하여 TiO₂함유 활성 탄소섬유를 만들면서 활성화조건에 따른 기공특성을 조사하였다. TiO₂을 함유하면 함유하지 않은 탄소섬유보다 burn-off가 가속되었는데 이는 TiO₂의 촉매적 산화가 탄소의 활성화를 촉진시키고 활성화에너지를 낮추었기 때문이다. TiO₂가 0.5 wt%함유되면 탄소섬유의 활성화에너지는 함유하지 않았을 때의 194 kJ/mole에서 140 kJ/mole로 감소하였고, 비표면적은 1,550 m²/g에서 1,155 m²/g로 감소하는 반면 평균기공크기는 18 Å에서 26 Å으로 증가하였다. TiO₂함유량이 증가할수록 평균세공크기는 더 커진다. TiO₂입자는 활성탄소섬유의 표면 및 내부에 비교적 고르게 분포되어 있으며, TiO₂(anatase)상태로 존재함을 확인할 수 있었다.

Titanium oxide (TiO₂)-containing activated carbon fibers (ACFs) were prepared by carbonization and steam activation of the 0.17, 0.34, 0.5 wt% TiO₂-containing oxidized pitch fibers and characterized the microporosity depending on the activation conditions. The burn-off of the TiO₂-containing carbon fiber was accelerated by the catalytic oxidation of TiO₂ to carbon. When the carbon fiber contained 0.5 wt% TiO₂, the activation energy of carbon fiber decreased from 194 kJ/mole to 140 kJ/mole, the specific surface area was reduced from 1,550 m²/g to 1,155 m²/g, while the average pore size increased from 18 Å to 26 Å due to this catalytic oxidation. The average pore size can be far enlarged by increasing the TiO₂ content. TiO₂ particle was confirmed to anatase and homogeneously distributed throughout the activated carbon fibers.

Titanium Oxide (TiO₂) Activated Carbon Fiber Microporosity Activation Energy Specific Surface Area

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