Yáñez Eliana, Santander Paola, Contreras David, Yáñez Jorge, Cornejo Lorena, Mansilla Héctor D
a Faculty of Chemical Sciences, University of Concepción , Concepción , Chile.
b Environmental Research Laboratory of Arid Zones, LIMZA, School of Mechanical Engineering, EUDIM, University of Tarapacá , Arica , Chile.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2016;51(1):78-85. doi: 10.1080/10934529.2015.1086211. Epub 2015 Nov 7.
Waste water from the wine industry is characterized by a high concentration of dissolved organic matter and the presence of natural phenolic compounds with low biodegradability. High concentrations of phenolic compounds may cause environmental pollution and risks to human health. In this article caffeic acid (CA) was used as a model compound of wine effluent because it is refractory to the conventional wastewater treatments. The oxidation of caffeic acid in water solution (0.01 g L(-1)) by heterogeneous photocatalysis and photo-Fenton reaction was studied using UVA. The optimal conditions for each treatment were performed by multivariate experimental design. The optimal conditions for heterogeneous photocatalysis were pH 5.3 and 0.9 g L(-1) TiO2. In the case of photo-Fenton treatment, optimized variable were 82.4 μmol L(-1) of Fe(2+) and 558.6 μmol L(-1) of H2O2. The degradation profiles of CA were monitored by UV-Vis, HPLC, TOC and COD. To reach 90% of CA removal, 40 and 2 min of reaction, respectively, were required by heterogeneous and photo-Fenton processes, respectively. For comparison purposes, the reactions were also performed under solar light. The use of solar light does not change the efficiency of the photo-Fenton reaction, yet the performance of the heterogeneous process was significantly improved, reaching 90% of degradation in 15 min.
葡萄酒行业的废水特点是溶解有机物浓度高，且存在生物降解性低的天然酚类化合物。高浓度的酚类化合物可能会造成环境污染并对人类健康构成风险。在本文中，咖啡酸（CA）被用作葡萄酒废水的模型化合物，因为它对传统废水处理方法具有抗性。利用紫外光A研究了非均相光催化和光芬顿反应对水溶液（0.01 g L(-1)）中咖啡酸的氧化作用。通过多变量实验设计确定了每种处理的最佳条件。非均相光催化的最佳条件是pH值为5.3，TiO2浓度为0.9 g L(-1)。在光芬顿处理中，优化变量为Fe(2+)浓度82.4 μmol L(-1)和H2O2浓度558.6 μmol L(-1)。通过紫外可见光谱、高效液相色谱、总有机碳和化学需氧量监测咖啡酸的降解情况。分别通过非均相和光芬顿过程达到90%的咖啡酸去除率，分别需要40分钟和2分钟的反应时间。为作比较，反应也在太阳光下进行。太阳光的使用并未改变光芬顿反应的效率，但非均相过程的性能显著提高，在15分钟内达到了90%的降解率。
