de la Obra I, Esteban García B, García Sánchez J L, Casas López J L, Sánchez Pérez J A
Solar Energy Research Centre CIESOL, Ctra de Sacramento s/n, ES04120, Almería, Spain.
Photochem Photobiol Sci. 2017 Jan 18;16(1):72-78. doi: 10.1039/c6pp00245e.
Light Emitting Diode (LED) technology has matured sufficiently to be considered as an alternative UVA radiation source in photoreactors. Currently, low energy consuming LEDs with a wide range of wavelengths and radiant flux are readily available. In this study, UVA-LEDs were used as a radiation source for the photo-Fenton process as tertiary treatment. The water matrix used was a simulated secondary effluent doped with 200 μg L of the pesticide acetamiprid (ACTM) due to its recalcitrant nature. All experiments were carried out in a LED-box reactor at pH 2.8. The main purpose of this research was to gain some insight into the relationships among energy supply, LED consumption, UVA irradiance and reaction rate. The effect of LED wavelength on energy efficiency for ACTM degradation was studied by varying the iron concentration and liquid depth. Three wavelengths (365, 385 and 400 nm) and two iron concentrations (5 and 11 mg L) for two different liquid depths (5 and 15 cm) were evaluated in order to obtain more energy efficient conditions. The results suggest that while the wavelength of 365 nm with 11 mg Fe L was the best condition for ACTM degradation, the wavelength of 385 nm had slower kinetics, but higher energy efficiency.
发光二极管（LED）技术已经足够成熟，可以被视为光反应器中的一种替代UVA辐射源。目前，具有广泛波长和辐射通量的低能耗LED很容易获得。在本研究中，UVA-LED被用作光芬顿工艺的辐射源进行三级处理。由于其难降解的性质，所使用的水基质是掺杂了200 μg/L杀虫剂啶虫脒（ACTM）的模拟二级出水。所有实验均在pH为2.8的LED箱式反应器中进行。本研究的主要目的是深入了解能量供应、LED消耗、UVA辐照度和反应速率之间的关系。通过改变铁浓度和液深，研究了LED波长对啶虫脒降解能量效率的影响。为了获得更节能的条件，评估了三种波长（365、385和400 nm）以及两种铁浓度（5和11 mg/L）在两种不同液深（5和15 cm）下的情况。结果表明，虽然11 mg Fe/L的365 nm波长是啶虫脒降解的最佳条件，但385 nm波长的动力学较慢，但能量效率较高。
