Le Thi Xuan Huong, Nguyen Thi Van, Amadou Yacouba Zoulkifli, Zoungrana Laetitia, Avril Florent, Nguyen Duy Linh, Petit Eddy, Mendret Julie, Bonniol Valerie, Bechelany Mikhael, Lacour Stella, Lesage Geoffroy, Cretin Marc
IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Université de Montpellier, Place E. Bataillon, F-34095, Montpellier, France; Van Lang University, 45 Nguyen Khac Nhu, District 1, Ho Chi Minh City, Viet Nam.
IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Université de Montpellier, Place E. Bataillon, F-34095, Montpellier, France.
Chemosphere. 2017 Apr;172:1-9. doi: 10.1016/j.chemosphere.2016.12.060. Epub 2016 Dec 21.
The evolution of the degradation by-products of an acetaminophen (ACE) solution was monitored by HPLC-UV/MS and IC in parallel with its ecotoxicity (Vibrio fischeri 81.9%, Microtox screening tests) during electro-Fenton (EF) oxidation performed on carbon felt. The aromatic compounds 2-hydroxy-4-(N-acetyl) aminophenol, 1,4-benzoquinone, benzaldehyde and benzoic acid were identified as toxic sub-products during the first stage of the electrochemical treatment, whereas aliphatic short-chain carboxylic acids (oxalic, maleic, oxamic, formic, acetic and fumaric acids) and inorganic ions (ammonium and nitrate) were well identified as non-toxic terminal sub-products. Electrogenerated hydroxyl radicals then converted the eco-toxic and bio-refractory property of initial ACE molecule (500 mL, 1 mM) and subsequent aromatic sub-products into non-toxic compounds after 2 h of EF treatment. The toxicity of every intermediate produced during the mineralization of ACE was quantified, and a relationship was established between the degradation pathway of ACE and the global toxicity evolution of the solution. After 8 h of treatment, a total organic carbon removal of 86.9% could be reached for 0.1 mM ACE at applied current of 500 mA with 0.2 mM of Fe used as catalyst.
在碳毡上进行电芬顿（EF）氧化过程中，通过高效液相色谱-紫外/质谱联用仪（HPLC-UV/MS）和离子色谱（IC）并行监测对乙酰氨基酚（ACE）溶液降解副产物的演变，并同时监测其生态毒性（费氏弧菌81.9%，微毒性筛选试验）。在电化学处理的第一阶段，芳香族化合物2-羟基-4-（N-乙酰基）氨基酚、1,4-苯醌、苯甲醛和苯甲酸被鉴定为有毒副产物，而脂肪族短链羧酸（草酸、马来酸、草酰胺酸、甲酸、乙酸和富马酸）和无机离子（铵离子和硝酸根离子）被明确鉴定为无毒的终产物。电生成的羟基自由基在EF处理2小时后，将初始ACE分子（500 mL，1 mM）及其后续芳香族副产物的生态毒性和生物难降解性转化为无毒化合物。对ACE矿化过程中产生的每种中间体的毒性进行了量化，并建立了ACE降解途径与溶液整体毒性演变之间的关系。在500 mA的施加电流和0.2 mM用作催化剂的铁存在下，对0.1 mM的ACE处理8小时后，总有机碳去除率可达86.9%。
