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以TiO2薄膜为光阳极,利用光电协同催化氧化技术降解水中藻毒素-LR,并研究该技术降解藻毒素-LR过程中的各种影响因素。随着阳极偏电压的增加藻毒素的去除率先增加后持平,当阳极偏电压值高于最佳值时,去除率保持不变甚至略有降低。充足的氧源会明显促进降解过程提高了藻毒素的去除率。pH的微小变化会引起去除率的较大波动。高流速的体系使得污染物在反应器中停留时间过短,从而导致其去除率的降低。过低的流速又不利于电极表面的传质过程,同样会降低藻毒素的去除率。在本论文的反应器中,以TiO2/Ti板为光阳极,在阳极偏电压2.5 V、空气环境、pH=8的体系流速为100 mL/min时,对藻毒素的去除率最大,2 h后就可达95%以上。
TiO2 thin film as a photoanode, the use of photocatalytic oxidation technology degradation of algal toxin - LR, and study the technology degradation of algal toxins - LR process of various factors. With the increase of the anode bias voltage, the removal rate of algal toxins first increases and then becomes flat. When the anode bias voltage is higher than the optimum value, the removal rate remains unchanged or even decreases slightly. Sufficient oxygen source will significantly promote the degradation process to improve the removal of algal toxins. Small changes in pH can cause large fluctuations in the removal rate. High-flow systems allow contaminants to stay too short in the reactor, resulting in a reduction of their removal rate. Low flow rate is not conducive to the mass transfer process of the electrode surface, the same will reduce the removal of algal toxins. In the reactor of this thesis, TiO2 / Ti plate was used as photoanode, and the removal rate of algal toxins was the highest when the anode bias voltage was 2.5 V and the air flow rate was 100 mL / min at pH = 8. After 2 h After up to 95% or more.