TY - JOUR

T1 - Effects and mechanisms of lincomycin degradation by six promoters in the mZVI/H2O2 systems

AU - Ouyang, Qiong

AU - Lian, Jintao

AU - Lu, Baizhou

AU - Fang, Zhanqiang

PY - 2020

Y1 - 2020

N2 - In this paper, the effects of lincomycin (LCM) degradation by six typical promoters such as tea polyphenols (TP), oxalic acid (OA), ethylenediaminetetraacetic acid disodium (EDTA), hydroxylamine hydrochloride (HA), sodium tripolyphosphate (TPP) and ascorbic acid (AA) on the Fe0/H2O2 system based on microscale zero valent iron (mZVI) were compared through batches of experiments. The degradation effects of promoters on the Fe0/H2O2 system in 90 min showed significant promotion (OA, AA and HA), moderate promotion (TP) and inhibition (EDTA, TPP), respectively. Moreover, this result was very consistent with the results of •OH and ORP. First, by studying the effects of each promoter on the pH value and the iron leaching of the Fe0/H2O2 system, it was preliminarily proved that the main reason for the enhancement of Fenton-like degradation of OA, HA and AA is to lower the pH and thus promote iron leaching. Then, through comparative experiments of reducing and chelating abilities of six promoters, it was proved that TP promoted the Fenton-like degradation mainly by reduction and chelation without significantly changing the pH of the system. Although EDTA and TPP have strong chelating ability and ability to promote iron leaching, respectively, they caused the pH to be too high, which inhibited the reaction. The results show that lowering the pH of system, promoting iron leaching, reducing ferric iron and chelating iron ions to avoid the formation of iron sludge are the main mechanisms of the current Fenton-like promoters. Moreover, the combination of multiple promotion methods can better adapt to different reaction conditions.

AB - In this paper, the effects of lincomycin (LCM) degradation by six typical promoters such as tea polyphenols (TP), oxalic acid (OA), ethylenediaminetetraacetic acid disodium (EDTA), hydroxylamine hydrochloride (HA), sodium tripolyphosphate (TPP) and ascorbic acid (AA) on the Fe0/H2O2 system based on microscale zero valent iron (mZVI) were compared through batches of experiments. The degradation effects of promoters on the Fe0/H2O2 system in 90 min showed significant promotion (OA, AA and HA), moderate promotion (TP) and inhibition (EDTA, TPP), respectively. Moreover, this result was very consistent with the results of •OH and ORP. First, by studying the effects of each promoter on the pH value and the iron leaching of the Fe0/H2O2 system, it was preliminarily proved that the main reason for the enhancement of Fenton-like degradation of OA, HA and AA is to lower the pH and thus promote iron leaching. Then, through comparative experiments of reducing and chelating abilities of six promoters, it was proved that TP promoted the Fenton-like degradation mainly by reduction and chelation without significantly changing the pH of the system. Although EDTA and TPP have strong chelating ability and ability to promote iron leaching, respectively, they caused the pH to be too high, which inhibited the reaction. The results show that lowering the pH of system, promoting iron leaching, reducing ferric iron and chelating iron ions to avoid the formation of iron sludge are the main mechanisms of the current Fenton-like promoters. Moreover, the combination of multiple promotion methods can better adapt to different reaction conditions.

KW - Fenton-like

KW - lincomycin

KW - promoters

KW - zero-valent iron

U2 - 10.1016/j.cej.2019.123417

DO - 10.1016/j.cej.2019.123417

M3 - Journal article

AN - SCOPUS:85075443976

VL - 387

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

M1 - 123417

ER -