Design of Photocatalytic Reactor Suspended with Semiconductor Powder.

本研究的主要目的是为悬浮式光催化反应器的设计提供基础资料。因此，本文研究了反应器内的光强分布和二氧化钛悬浮液的光催化氧化速率，得到了以下结论。(1)用光探针测量了悬浮二氧化钛的矩形光反应器中的局部光强分布。低浓度区光照强度缓慢下降，高浓度区光照强度先迅速上升后逐渐下降。(2)根据本研究提出的三维六通量模型，可以模拟出局部光强分布。(3)对于悬浮有二氧化钛的环形光反应器，分别用DPOF化学光度计系统和光探针测定了平均光强和局部光强分布。前者随TiO2浓度的增加先逐渐减小后迅速减小，后者与悬浮TiO2的矩形光反应器中的分布基本一致。(4)催化剂与反应物的相对浓度比影响NADH的光催化氧化速率。金红石型二氧化钛的添加是没有用的光催化氧化速率，因为吸收的金红石型二氧化钛。

The main object of this research project is to obtain fundamental information for design of suspended photocatalytic reactor. So, the light intensity distributions in this reactors and the photocatalytic oxidation rate were investigated in a suspension of titanium-dioxide powder.The following conclusions were obtained.(1) The local light intensity distribution in a rectangular photoreactor suspended with titanium-dioxide was detected with a photo-probe. The light intensity slowly decreased at low titanium-dioxide concentration area, but rapidly increased first and gradually decreased later at high concentration area.(2) According to the three-dimensional six-flux model proposed in this research project, the local light intensity distribution could be simulated.(3) For an annular photoreactor suspended with titanium-dioxide, the average light intensity and local light intensity distribution was decided with a DPOF chemical actinometer system and a photo-probe, respectively. The former gradually decreased first and rapidly decreased later with increase of titanium-dioxide concentration, the later was almost the same as the distribution in a rectangular photoreactor suspended with titanium-dioxide.(4) The photocatalytic oxidation rate of NADH was affected by the relative concentration ratio of catalyst and reactant. Addition of a rutile type titanium-dioxide was not useful for photocatalytic oxidation rate because of absorption by anatase type titanium-dioxide.