Design of Photocatalytic Reactor Suspended with Semiconductor Powder.

本课题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，在二氧化钛粉悬浮液中，研究了该反应器中的光强分布和光催化氧化速率。得到以下结论：(1)用光探针检测悬浮二氧化钛矩形光反应器内的局部光强分布。在低二氧化钛浓度区域，光强缓慢下降，在高浓度区域，光强先迅速上升，后逐渐下降。(2)根据本课题提出的三维六通量模型，可以模拟局部光强分布。(3)对于悬浮二氧化钛的环形光反应器，分别用DPOF化学光强计系统和光探针确定了平均光强和局部光强分布。前者随二氧化钛浓度的增加先逐渐减小后迅速减小，后者与悬浮二氧化钛的矩形光反应器中的分布基本一致。(4) NADH的光催化氧化速率受催化剂与反应物的相对浓度比的影响。金红石型二氧化钛被锐钛矿型二氧化钛吸附，不利于提高光催化氧化速率。

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.