Abstract：Nitrilotriacetic acid (NTA) was applied to enhance and improve the oxidation efficiency of azo dyes in Fe0/PMS system. Taking Orange G (OG) as the target pollutant, the degradation efficiency of OG, the strengthening role of NTA, the effects of NTA, Fe0, PMS and general coexistence substances in water on the degradation of OG were studied in Fe0/PMS system enhanced with NTA(NTA/Fe0/PMS).The results demonstrated that the introduction of NTA could enhance the degradation of OG by Fe0/PMS system, and the initial pH had a significant effect on the enhancement. Under neutral (pH=7) and acidic (pH=3) conditions, the apparent rate constants of OG removal by NTA/Fe0/PMS system were 31.3 times and 5.5 times higher than those of Fe0/PMS system, respectively. Increasing the concentration of NTA, Fe0 and PMS facilitated the degradation of OG, but negative effects were observed when NTA or PMS concentration were over 8mmol/L and 1.0mmol/L, respectively. In the context of water quality, the presence of Cl- promoted the degradation of OG, while HCO3-, H2PO4- and Humic Acid showed different degrees of inhibition. In NTA/Fe0/PMS system, SO4·- and·OH produced at Fe0 interface was confirmed to be the dominant active species responsible for OG degradation, and heterogeneous and homogeneous activation of PMS contributed about 83.2% and 16.8% to the degradation of OG, respectively. When adding NTA to Fe0/PMS system, Fe3+/Fe2+ generated could be complexed rapidly with NTA, which not only alleviated the formation of passive layer and promoting the direct activation of PMS on Fe0 interface, but also increased the concentration of soluble iron in system, promoting the activation of PMS by homogeneous interaction. Thus, the degradation effect of OG in Fe0/PMS system was enhanced by NTA.
马红芳, 杨浩宇, 田委民, 伍凌斌, 陈秀峰, 邹景. 氨三乙酸强化零价铁/过一硫酸盐降解橙黄G[J]. 中国环境科学, 2021, 41(4): 1597-1607.
MA Hong-fang, YANG Hao-yu, TIAN Wei-min, WU Ling-bin, CHEN Xiu-feng, ZOU Jing. Degradation of Orange G by Fe0/peroxymonosulfate with nitrilotriacetic acid enhancement. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1597-1607.
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