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Parameters on 17β‐Estradiol degradation by Ultrasound in an aqueous system
Author(s) -
Ma Xiaoyan,
Tang Kai,
Li Qingsong,
Song Yali,
Ni Yongjiong,
Gao Naiyun
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4217
Subject(s) - degradation (telecommunications) , aqueous solution , chemistry , pulmonary surfactant , ultrasound , wastewater , nanoparticle , kinetics , nuclear chemistry , sewage treatment , materials science , environmental engineering , organic chemistry , nanotechnology , biochemistry , medicine , telecommunications , physics , quantum mechanics , computer science , engineering , radiology
Abstract BACKGROUND As the strongest natural estrogen, 17β‐estradiol (E2) which occurs in water through drainage of municipal and industrial wastewater treatment plants, may represent a serious health risk to humans, even at extremely low concentrations (ng L ‐1 ). To reduce the amount of E2 in an aqueous system, KMnO 4 ‐assisted ultrasound was adopted and compared with ultrasound and KMnO 4 , each alone, and the influencing factors were determined . RESULTS The efficiency of removal of E2 was low under single ultrasound irradiation alone, but was enhanced from14.6% to 85.5% when assisted by the addition of 3 mg L ‐1 KMnO 4 after 30 min contact. Degradation of E2 could be described by first‐order kinetics models. The degradation rates were proportional to the dosage of KMnO 4 in the range from 0 to 5 mg L ‐1 . The optimal pH for the processes was alkaline (for the ultrasound) and strong acidic (for the combined ultrasound/KMnO 4 ). The common cation Na + initially inhibited and then promoted degradation of E2 in both processes, and anionic surfactant was a favourable factor in the degradation of E2 . CONCLUSION KMnO 4 ‐oxidatively enhanced ultrasound effectively removed E2 from an aqueous system. Since pH, cation and existing chemicals such as surfactant can affect the degradation of E2, these factors should be taken into consideration to obtain satisfactory results. © 2013 Society of Chemical Industry