The increasing presence of freshwater toxins have brought new challenges to preserve water quality due to their potential impact on the environment and human health. Two commonly occurring cyanotoxins, microcystin-LR and cylindrospermopsin, with different physico-chemical properties were used to evaluate the efficiency of photocatalysis using a continuous-flow reactor with immobilized TiO2 on glass tubes and UV-A light. The effect of flow rate and hydrogen peroxide addition on the efficiency of cyanotoxin removal were evaluated. An analysis of the effects on microcystin-LR removal efficiency showed that low flow rates (1 mL/min) and high H2O2 concentrations (120 mg/L) were needed to provide effective degradation. Up to 27.9% and 39.1% removal of MC-LR and CYN, respectively were achieved by UV-A/TiO2 after a single pass through the reactor. A slight increase of the removal of both cyanotoxins was observed when they were in a mixture (35.5% of MC-LR and 51.3% of CYN). The addition of H2O2 to the UV/TiO2 system led to an average removal enhancement of 92.6% of MC-LR and of 29.5% of CYN compared to the UV/TiO2 system. Photolysis assisted by H2O2 degraded MC-LR by up to 77.7%. No significant removal (<10%) was observed by photolysis alone or physical adsorption. This study presents a proof-of-principle that demonstrates the feasibility for this technology to be integrated in large-scale applications.

中文翻译：

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通过固定化TiO2上连续流UV-A光催化降解微囊藻毒素-LR和环精胺。

由于淡水毒素对环境和人类健康的潜在影响，它们不断增加的存在带来了新的挑战，以保护水质。使用具有不同理化性质的两种常见的氰毒素，微囊藻毒素-LR和环孢菌素，来评估使用固定在玻璃管上的TiO2连续流反应器和UV-A光的光催化效率。评估了流速和过氧化氢添加量对蓝藻毒素去除效率的影响。对微囊藻毒素-LR去除效率的影响分析表明，需要低流速（1 mL / min）和高H2O2浓度（120 mg / L）才能有效降解。单次通过反应器后，通过UV-A / TiO2分别可分别去除多达27.9％和39.1％的MC-LR和CYN。当两种氰毒素混合在一起时，它们的去除率略有增加（35.5％的MC-LR和51.3％的CYN）。与UV / TiO2系统相比，向UV / TiO2系统中添加H2O2导致MC-LR和CYN的平均去除率提高了92.6％和29.5％。H2O2辅助的光解作用使MC-LR降解达77.7％。单独光解或物理吸附未观察到明显的去除（<10％）。这项研究提供了原理证明，证明了将该技术集成到大规模应用中的可行性。H2O2辅助的光解作用使MC-LR降解达77.7％。单独光解或物理吸附未观察到明显的去除（<10％）。这项研究提供了原理证明，证明了将该技术集成到大规模应用中的可行性。H2O2辅助的光解作用使MC-LR降解达77.7％。单独光解或物理吸附未观察到明显的去除（<10％）。这项研究提供了原理证明，证明了将该技术集成到大规模应用中的可行性。