TY - JOUR

T1 - Tea polyphenols promote Fenton-like reaction

T2 - pH self-driving chelation and reduction mechanism

AU - Ouyang, Qiong

AU - Kou, Fangying

AU - Zhang, Nuanqin

AU - Lian, Jintao

AU - Tu, Guoquan

AU - Fang, Zhanqiang

PY - 2019

Y1 - 2019

N2 - Tea polyphenols (TP) are natural green organic compounds with chelating and reducing properties, which can promote the catalytic reaction, but the mechanism of promotion is still uncertain. In this paper, the chelation and reduction of TP were used to promote the degradation of lincomycin (LCM) by zero-valent iron Fenton-like reaction, and the mechanism of the two properties of TP was analyzed. The results showed that in the Fe0/H2O2 system, the degradation rate of the reaction system was increased from 27% to 100% in two hours after the addition of TP, and the reaction rate was increased about 26 times. Moreover, the parameters of pH, Fe2+, ·OH, oxidation reduction potential (ORP) and so forth indicating that the chelating structure of TP and iron ions was formed under pH = 4–9, which obviously promoted the mutual conversion of Fe3+/Fe2+. It is propitious to the proper amount of iron dissolution in order to facilitate the continuous and efficient Fenton reaction. Under acidic conditions, the TP are more reductive due to the destruction of the chelate structure, which promotes the conversion of Fe3+ to Fe2+ or even zero-valent iron, significantly improves the Fe3+/Fe2+ cycle capacity and increases the amount of [rad]OH produced.

AB - Tea polyphenols (TP) are natural green organic compounds with chelating and reducing properties, which can promote the catalytic reaction, but the mechanism of promotion is still uncertain. In this paper, the chelation and reduction of TP were used to promote the degradation of lincomycin (LCM) by zero-valent iron Fenton-like reaction, and the mechanism of the two properties of TP was analyzed. The results showed that in the Fe0/H2O2 system, the degradation rate of the reaction system was increased from 27% to 100% in two hours after the addition of TP, and the reaction rate was increased about 26 times. Moreover, the parameters of pH, Fe2+, ·OH, oxidation reduction potential (ORP) and so forth indicating that the chelating structure of TP and iron ions was formed under pH = 4–9, which obviously promoted the mutual conversion of Fe3+/Fe2+. It is propitious to the proper amount of iron dissolution in order to facilitate the continuous and efficient Fenton reaction. Under acidic conditions, the TP are more reductive due to the destruction of the chelate structure, which promotes the conversion of Fe3+ to Fe2+ or even zero-valent iron, significantly improves the Fe3+/Fe2+ cycle capacity and increases the amount of [rad]OH produced.

KW - Fe/Fe cycle

KW - Fenton-like

KW - Lincomycin

KW - Tea polyphenols

KW - Zero-valent iron

U2 - 10.1016/j.cej.2019.02.078

DO - 10.1016/j.cej.2019.02.078

M3 - Journal article

AN - SCOPUS:85061633169

VL - 366

SP - 514

EP - 522

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -