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Decomposition of phenolic endocrine disrupting chemicals by potassium permanganate and $$gamma$$-ray irradiation

過マンガン酸カリウム及び$$gamma$$線照射によるフェノール系内分泌攪乱物質の分解

阿部 康弘*; 瀧上 眞知子; 杉野 公二*; 田口 光正; 小嶋 拓治; 梅村 智也*; 角田 欣一*

Abe, Yasuhiro*; Takigami, Machiko; Sugino, Koji*; Taguchi, Mitsumasa; Kojima, Takuji; Umemura, Tomonari*; Tsunoda, Kinichi*

フェノール,ブチルフェノール(BuP),ビスフェノールA(BPA)等のフェノール系内分泌攪乱物質(P-EDCs)50$$mu$$M水溶液の分解を過マンガン酸カリウム(KMnO$$_{4}$$)を用いて行い、$$^{60}$$Co$$gamma$$線照射により生成したOHラジカルによるP-EDCsの分解と比較した。種々の有機酸及び無機炭素が、KMnO$$_{4}$$及びOHラジカルによるP-EDCsの分解で生成した。KMnO$$_{4}$$処理では、有機酸及び無機炭素は芳香族環の直接開裂で形成され、OHラジカル処理の場合にはOHラジカルの芳香族環への付加・置換反応に続く芳香族環の開裂により形成される。一方、BuP及びBPAを完全に取り除くために必要とされる電子数で分解効率の比較を行うと、KMnO$$_{4}$$はOHラジカルとほぼ同等であったが、フェノールの100%分解では、KMnO$$_{4}$$はOHラジカルの3倍量必要であった。しかし、フェノールを完全に有機酸及び無機炭素に変化させるために必要な電子数は720$$mu$$Mであり、両処理で同等であった。

The decomposition of phenolic endocrine disrupting chemicals (P-EDCs), such as phenol, 4-butylphenol (BuP), and bisphenol A (BPA), in aqueous solutions by potassium permanganate (KMnO$$_{4}$$) was studied and its efficiency was compared with that of hydroxyl radicals (OH$$^{.}$$) generated by $$^{60}$$Co $$gamma$$-ray irradiation. Various organic acids and inorganic carbon were formed in the decomposition of P-EDCs due to either KMnO$$_{4}$$ or OH$$^{.}$$. They were formed via direct aromatic ring cleavage in the case of KMnO$$_{4}$$ and OH$$^{.}$$ addition-substitution reactions followed by aromatic ring cleavage in the case of OH$$^{.}$$. Comparing the decrease in the P-EDCs based on the number of electrons, the amount of KMnO$$_{4}$$ spent to completely eliminate BuP and BPA was comparable to the amount of OH$$^{.}$$. Although three times more KMnO$$_{4}$$ was needed for phenol than OH$$^{.}$$, the complete conversion of phenol into organic acids and inorganic carbon was achieved with 720$$mu$$M of electrons in both cases.

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パーセンタイル:26.51

分野:Chemistry, Multidisciplinary

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