Wang Jie, Li Fengjie, Wang Mi, Wang Hualing, Elgarhy Abdelbaky Hossam, Liu Guanglong, Zhang Lichao, Hu Ronggui
State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
Chemosphere. 2022 Nov;307(Pt 2):135900. doi: 10.1016/j.chemosphere.2022.135900. Epub 2022 Aug 6.
Iron oxides play an important role in the transport and transformation of organic phosphorus in aquatic environments. However, the effect of different types of iron oxide on the environmental fate of organic phosphorus has remained unclear. In this study, the photodegradation of the organic phosphorus compound adenosine triphosphate (ATP) via the activity of crystalline (goethite) and amorphous (ferrihydrite) iron oxides was investigated. It was found that ATP was photodegraded by goethite, resulting in the release of dissolved inorganic phosphate under simulated sunlight irradiation. The concentration of ATP on goethite decreased by 75% after 6 h of simulated sunlight irradiation, while the concentration of ATP on ferrihydrite decreased by only 22%. ATR-FTIR spectroscopy revealed that the intensity of the peaks for the P-O and PO stretching vibrations in the goethite-ATP complex decreased significantly more after simulated sunlight irradiation than did those for the ferrihydrite treatment. Combined with the higher TOC/TOC values for the goethite treatment, the results indicate that a more vigorous photochemical reaction took place in the presence of goethite than with ferrihydrite. Reactive oxygen species analysis also showed that hydroxyl and superoxide anion radicals were generated when goethite was exposed to simulated sunlight irradiation, while ferrihydrite did not exhibit this ability. Overall, this study highlights that the type of iron oxide is an important factor in the transformation of organic phosphorus in aquatic environments.
铁氧化物在水生环境中有机磷的迁移和转化过程中发挥着重要作用。然而，不同类型的铁氧化物对有机磷环境归宿的影响仍不明确。在本研究中，通过结晶态（针铁矿）和非晶态（水铁矿）铁氧化物的活性，研究了有机磷化合物三磷酸腺苷（ATP）的光降解情况。研究发现，在模拟阳光照射下，针铁矿可使ATP发生光降解，导致溶解态无机磷酸盐的释放。模拟阳光照射6小时后，针铁矿上ATP的浓度降低了75%，而水铁矿上ATP的浓度仅降低了22%。衰减全反射傅里叶变换红外光谱（ATR-FTIR）显示，模拟阳光照射后，针铁矿-ATP络合物中P-O和PO伸缩振动峰的强度下降幅度明显大于水铁矿处理后的下降幅度。结合针铁矿处理中更高的总有机碳/总有机碳值，结果表明，与水铁矿相比，针铁矿存在时发生了更剧烈的光化学反应。活性氧分析还表明，针铁矿在模拟阳光照射下会产生羟基自由基和超氧阴离子自由基，而水铁矿则没有这种能力。总体而言，本研究强调铁氧化物类型是水生环境中有机磷转化的一个重要因素。
