Degradation of microcystin-LR and cylindrospermopsin by continuous flow UV-A photocatalysis over immobilised TiO2.
Degradation of microcystin-LR and cylindrospermopsin by continuous flow UV-A photocatalysis over immobilised TiO2.
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DOI：
10.1016/j.jenvman.2020.111368
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发表时间：
2020-09
影响因子：
8.7
通讯作者：
D. Camacho-Muñoz;Anne-Sophie Fervers;Carlos J. Pestana;C. Edwards;L. Lawton
中科院分区：
文献类型：
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作者：
D. Camacho-Muñoz;Anne-Sophie Fervers;Carlos J. Pestana;C. Edwards;L. Lawton
由于淡水毒素对环境和人类健康的潜在影响，越来越多的淡水毒素给保护水质带来了新的挑战。以两种常见的蓝藻毒素微囊藻毒素-LR和柱状精浆蛋白为研究对象，考察了在玻璃管上负载二氧化钛的连续流反应器和紫外光照射下的催化效率。考察了流速和过氧化氢投加量对氰化毒素去除效果的影响。对影响微囊藻毒素-LR去除效果的分析表明，低流速(1 mg/m in)和高H_2O_2浓度(120 mg/L)才能提供有效的降解。UV-A/TiO2对MC-LR和CyN的单程去除效果分别达到27.9%和39.1%。当两者混合时，两种氰基毒素的去除略有增加(MC-LR的35.5%和CyN的51.3%)。在UV/TiO2体系中加入H_2O_2后，MC-LR的平均去除效率提高了92.6%，氰化氢的平均去除效率提高了29.5%。过氧化氢辅助光解对MC-LR的降解率高达77.7%。单独的光解或物理吸附没有观察到明显的去除(<；10%)。这项研究提供了一种原理证明，证明了该技术在大规模应用中集成的可行性。
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 TiO2on 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 H2O2concentrations (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/TiO2after 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 H2O2to the UV/TiO2system led to an average removal enhancement of 92.6% of MC-LR and of 29.5% of CYN compared to the UV/TiO2system. Photolysis assisted by H2O2degraded 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.