Silva Marcio J, Soares Sarah A R, Santos Ingrid D F, Pepe Iuri M, Teixeira Leandro R, Pereira Lucas G, Silva Lucas B A, Celino Joil J
Postgraduate Program in Geochemistry: Petroleum and Environment, Geoscience Institute, Federal University of Bahia, Rua Barão de Jeremoabo, s/n, 40170-020 Salvador, BA, Brazil.
LEPETRO, Excellence in Geochemistry: Petroleum, Energy and Environment, Geoscience Institute, Federal University of Bahia, Rua Barão de Jeremoabo, s/n, 40170-020 Salvador, BA, Brazil.
Heliyon. 2020 Oct 8;6(10):e05163. doi: 10.1016/j.heliyon.2020.e05163. eCollection 2020 Oct.
Polycyclic aromatic hydrocarbons (PAHs) are part of a class of organic compounds resistant to natural degradation. In this way, heterogeneous photocatalysis becomes useful to degrade persistent organic pollutants, however it can be influenced by environmental variables (i.e.: organic matter) and experimental factors such as: mass of the photocatalyst and irradiation time. The objective of this research was to use a factorial design 2 as a function of the multiple response (MR) to evaluate simultaneously experimental conditions for the photodegradation of polycyclic aromatic hydrocarbons in contaminated mangrove sediment and its application in oil from Potiguar Basin in Brazil. The sediment samples collected in Belmonte city (Southern Bahia state) were contaminated with 0.25 mg kg of Acenaphthene, Anthracene, Benzo[a]Anthracene, Indene[1,2,3cd]pyrene, Dibenzo[ah]anthracene, Benzo[ghi]pyrene. Factors such as mass of the photocatalyst and irradiation time were evaluated in factorial design 2, with triplicate from the central point, to 1g of the PAH contaminated sediment. After performing the experiments, it was found that the best experimental condition for the degradation of all PAHs indicated by MR was the central point (0.5 g of photocatalyst and 12h of irradiation). For such conditions, the half-life of PAHs varied from 3.51 to 9.37 h and the degradation speed constant between 0.0740 to 0.1973 h. The comparison of the optimized methodology between photolysis tests and heterogeneous photocatalysis was performed using the Kruskal-Wallis test, which indicated a difference for the reference solution, where heterogeneous photocatalysis was more efficient in the degradation of PAHs. The optimized methodology was apply in samples contaminated with crude oil from Potiguar Basin, no significant difference was observed in the aromatic fraction, using for the Kruskal-Wallis test. Heterogeneous photocatalysis has shown to be a promising remediation technique to remedy aromatic organic compounds in mangrove sediments.
多环芳烃（PAHs）是一类抗自然降解的有机化合物。通过这种方式，非均相光催化对于降解持久性有机污染物变得有用，然而它可能受到环境变量（即：有机物）和实验因素的影响，例如：光催化剂的质量和辐照时间。本研究的目的是使用析因设计2作为多响应（MR）的函数，同时评估受污染红树林沉积物中多环芳烃光降解的实验条件及其在巴西波蒂瓜尔盆地石油中的应用。在贝尔蒙特市（巴伊亚州南部）采集的沉积物样本被0.25毫克/千克的苊、蒽、苯并[a]蒽、茚并[1,2,3-cd]芘、二苯并[ah]蒽、苯并[ghi]芘污染。在析因设计2中评估了光催化剂质量和辐照时间等因素，以1克多环芳烃污染的沉积物为中心点进行了三次重复实验。实验完成后发现，MR表明所有多环芳烃降解的最佳实验条件是中心点（0.5克光催化剂和12小时辐照）。在这种条件下，多环芳烃的半衰期在3.51至9.37小时之间变化，降解速度常数在0.0740至0.1973小时之间。使用Kruskal-Wallis检验对光解试验和非均相光催化之间的优化方法进行了比较，结果表明参考溶液存在差异，其中非均相光催化在多环芳烃降解方面更有效。将优化方法应用于受波蒂瓜尔盆地原油污染的样本，使用Kruskal-Wallis检验未观察到芳烃馏分有显著差异。非均相光催化已被证明是一种有前途的修复技术，可用于修复红树林沉积物中的芳香族有机化合物。
