摘要
Commercial available zero valent aluminum under air-equilibrated acidic conditions（ZVAl/H＋/air system） demonstrated an excellent capacity to remove aqueous organic compounds.Acetaminophen（ACTM）,the active ingredient of the over-the-counter drug Tylenol？,is widely present in the aquatic environment and therefore the treatment of ACTM-contaminated water calls for further research.Herein we investigated the oxidative removal of ACTM by ZVAl/H＋/air system and the reaction mechanism.In acidic solutions（pH 3.5）,ZVAl displayed an excellent capacity to remove ACTM.More than 99% of ACTM was eliminated within 16 hr in pH 1.5 reaction solutions initially containing 2.0 g/L aluminum and 2.0 mg/L ACTM at 25 ± 1℃.Higher temperature and lower pH facilitated ACTM removal.The addition of different iron species Fe0,Fe2＋ and Fe3＋ into ZVAl/H＋/air system dramatically accelerated the reaction likely due to the enhancing transformation of H2O2 to HO.via Fenton＇s reaction.Furthermore,the primary intermediate hydroquinone and the anions formate,acetate and nitrate,were identified and a possible reaction scheme was proposed.This work suggested that ZVAl/H＋/air system may be potentially employed to treat ACTM-contaminated water.
Commercial available zero valent aluminum under air-equilibrated acidic conditions（ZVAl/H＋/air system） demonstrated an excellent capacity to remove aqueous organic compounds.Acetaminophen（ACTM）,the active ingredient of the over-the-counter drug Tylenol？,is widely present in the aquatic environment and therefore the treatment of ACTM-contaminated water calls for further research.Herein we investigated the oxidative removal of ACTM by ZVAl/H＋/air system and the reaction mechanism.In acidic solutions（pH 3.5）,ZVAl displayed an excellent capacity to remove ACTM.More than 99% of ACTM was eliminated within 16 hr in pH 1.5 reaction solutions initially containing 2.0 g/L aluminum and 2.0 mg/L ACTM at 25 ± 1℃.Higher temperature and lower pH facilitated ACTM removal.The addition of different iron species Fe0,Fe2＋ and Fe3＋ into ZVAl/H＋/air system dramatically accelerated the reaction likely due to the enhancing transformation of H2O2 to HO.via Fenton＇s reaction.Furthermore,the primary intermediate hydroquinone and the anions formate,acetate and nitrate,were identified and a possible reaction scheme was proposed.This work suggested that ZVAl/H＋/air system may be potentially employed to treat ACTM-contaminated water.
基金
supported by the National Natural Sci-ence Foundation of China (No. 21077091,20837002)
Qianjiang Talent Project of Zhejiang Province (No.2011R10075)
