Bianco Prevot A, Baino F, Fabbri D, Franzoso F, Magnacca G, Nisticò R, Arques A
Dipartimento di Chimica, Università degli Studi di Torino, Torino, Italy.
NIS Centre, Via Giuria 7, Torino, Italy.
Environ Sci Pollut Res Int. 2017 May;24(14):12599-12607. doi: 10.1007/s11356-016-7763-1. Epub 2016 Sep 30.
Caffeine-photosensitized degradation has been studied in the presence of bio-based materials derived from urban biowaste after aerobic aging. A peculiar fraction (namely bio-based substances (BBSs)), soluble in all the pH range, has been used as photosensitizing agent. Several caffeine photodegradation tests have been performed, and positive results have been obtained in the presence of BBSs and HO, without and with additional Fe(II) (photo-Fenton-like process). Moreover, hybrid magnetite-BBS nanoparticles have been synthesized and characterized, in order to improve the sensitizer recovery and reuse after the caffeine degradation. In the presence of such nanoparticles and HO and Fe(II), the complete caffeine degradation has been attained in very short time. Both homogeneous and heterogeneous processes were run at pH = 5, milder condition compared to the classic photo-Fenton process.
在有氧老化后源自城市生物废弃物的生物基材料存在的情况下，对咖啡因的光敏降解进行了研究。一种在所有pH范围内均可溶解的特殊组分（即生物基物质（BBSs））被用作光敏剂。进行了多项咖啡因光降解试验，在有BBSs和羟基自由基（HO）存在的情况下，无论有无额外的亚铁离子（类光芬顿过程）均获得了阳性结果。此外，为了提高咖啡因降解后敏化剂的回收和再利用，合成并表征了磁性氧化铁-BBS杂化纳米颗粒。在这种纳米颗粒以及羟基自由基和亚铁离子存在的情况下，能在极短时间内实现咖啡因的完全降解。均相和非均相过程均在pH = 5的条件下进行，这比经典的光芬顿过程条件更为温和。
