Photodegradation mechanism and kinetics of methyl orange catalyzed by Fe(III) and citric acid

The role of Fe(III) on phosphate released during the photo-decomposition of organic phosphorus in deionized and natural waters

“…Fig. 1a shows that glyphosate was degraded under UV light irradiation and the degradation rate reached 20%, which was similar to a previous report (Guo et al, 2011). However, the UV/Fe 3þ system resulted in a reduction in the concentration of glyphosate of 95% after 60 min under UV irradiation.…”

Contribution of Irradiation and Dihydroxybenzenes on Iron(III) Reduction in Fenton Process

“…24 In the presence of citrate, Fe III is reduced under irradiation due to a ligand to metal charge transfer, exhibiting higher photoactivity to produce •OH under irradiation than in the absence of citrate. 25 In the presence of citrate, CAT was formed only after 20 min, achieving 0.25 mmol L −1 , indicating that the formation of CAT started after partial degradation of citrate, as can be observed by TOC concentration (Figure 3). Fe 2+ was determined during phenol degradation to compare the reduction of Fe 3+ by CAT, HQ, citrate and irradiation in the absence of H 2 O 2 to avoid Fe 2+ oxidation (Figure 4).…”

Activation of Hydrogen Peroxide by Activated Carbon Fibers Coupled with Fe(Ⅲ)-Citrate for Degradation of Dyes at Neutral pH

“…在这些配体中, EDTA 尽管与铁配位具有较好的稳定性, 但因其可生物 降解性差而受到限制 [9] ; 柠檬酸不仅是一种天然的化合 物, 具有无毒、可生物降解等特性, 而且与铁离子形成 配合物的累积稳定常数(lg β＝12.5)明显高于草酸铁(lg β ＝9.4)和琥珀酸铁(lg β＝7.49) [10] , 这说明柠檬酸铁在催 化过程中具有较好的化学稳定性. 因此, 近年来柠檬酸 铁在类芬顿催化领域特别备受关注 [11,12] . 但是, 柠檬酸 铁在均相反应中往往伴随着不可避免的配体自分解过 程, 这一缺陷不仅使得柠檬酸铁的催化活性逐渐降低, 而且进一步会导致大量氢氧化铁沉淀的产生, 从而带来 二次污染.…”