光电协同催化氧化处理饮用水中藻毒素-LR

PHOTOELECTROCATALYTIC OXIDATION OF MICROCYSIN-LR IN DRINKING WATER

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。

Microcysin-LR in drinking water was degraded by photoelectrocatalytic oxidation using TiO2 film as a photoanode.Then,the influence of conditions on removal efficiency of microcysin-LR by the photoelectrocatalytic oxidation was studied.As the anode bias voltage increased,the removal of microcysin-LR was first increased,and then changed little.When the anode bias voltage value is higher than the optimal value,the removal efficiency remained unchanged or even slightly lower.Adequate oxygen source would significantly promote the degradation process of microcysin.Small changes in pH value caused obvious fluctuation in the removal efficiency of microcysin.The high velocity in the system allowed the short residence time of the pollutants in the reactor.Low flow rate was not conducive to the electrode surface and mass transfer process.Both of these would reduce the removal efficiency of microcysin.In this paper,the removal efficiency of microcysins reached 95% within two hours,when the anode bias voltage was 2.5V,pH value in systems was 8 and the system flow rate was 100 mL/min.