Shih Yu-Jen, Binh Nguyen Thanh, Chen Chiu-Wen, Chen Chih-Feng, Dong Cheng-Di
Department of Marine Environmental Engineering, National Kaohsiung Marine University, Kaohsiung 81157, Taiwan.
Department of Marine Environmental Engineering, National Kaohsiung Marine University, Kaohsiung 81157, Taiwan.
Chemosphere. 2016 May;150:294-303. doi: 10.1016/j.chemosphere.2016.01.112. Epub 2016 Feb 23.
Various chemical oxidation techniques, such as potassium permanganate (KMnO4), sodium persulfate (Na2S2O8), Fenton (H2O2/Fe(2+)), and the modified persulfate and Fenton reagents (activated by ferrous complexes), were carried out to treat marine sediments that were contaminated with polycyclic aromatic hydrocarbons (PAHs) and dredged from Kaohsiung Harbor in Taiwan. Experimental results revealed that KMnO4 was the most effective of the tested oxidants in PAH degradation. Owing to the high organic matter content in the sediment that reduced the efficiencies of Na2S2O8 and regular Fenton reactions, a large excess of oxidant was required. Nevertheless, KH2PO4, Na4P2O7 and four chelating agents (EDTA, sodium citrate, oxalic acid, and sodium oxalate) were utilized to stabilize Fe(II) in activating the Na2S2O8 and Fenton oxidations, while Fe(II)-citrate remarkably promoted the PAH degradation. Increasing the molecular weight and number of rings of PAH did not affect the overall removal efficiencies. The correlation between the effectiveness of the oxidation processes and the physicochemical properties of individual PAH was statistically analyzed. The data implied that the reactivity of PAH (electron affinity and ionization potential) affected its treatability more than did its hydrophobicity (Kow, Koc and Sw), particularly using experimental conditions under which PAHs could be effectively oxidized.
采用了多种化学氧化技术，如高锰酸钾（KMnO4）、过硫酸钠（Na2S2O8）、芬顿试剂（H2O2/Fe(2+)）以及改性过硫酸盐和芬顿试剂（由亚铁络合物活化），来处理从台湾高雄港疏浚的受多环芳烃（PAHs）污染的海洋沉积物。实验结果表明，在PAH降解方面，KMnO4是测试氧化剂中最有效的。由于沉积物中有机物含量高，降低了Na2S2O8和常规芬顿反应的效率，因此需要大量过量的氧化剂。尽管如此，利用KH2PO4、Na4P2O7和四种螯合剂（EDTA、柠檬酸钠、草酸和草酸钠）来稳定Fe(II)以活化Na2S2O8和芬顿氧化反应，而柠檬酸铁显著促进了PAH的降解。PAH分子量和环数的增加并不影响总体去除效率。对氧化过程的有效性与单个PAH的物理化学性质之间的相关性进行了统计分析。数据表明，PAH的反应性（电子亲和力和电离势）对其可处理性的影响大于其疏水性（Kow、Koc和Sw），特别是在PAHs可被有效氧化的实验条件下。
