Degradation of antibiotic amoxicillin using 1×1 molecular sieve-structured manganese oxide

Wen Hui Kuan, Ching Yao Hu, Bin Sheng Liu, Yu Min Tzou

研究成果: 雜誌貢獻文章

6 引文 斯高帕斯(Scopus)

摘要

The kinetics and mechanism of amoxicillin (AMO) degradation using a 1×1 molecular sieve-structured manganese oxide (MnO2) was studied. The presence of the buffer solution (i.e., NaHCO3, NaH 2PO4 and KH2PO4) diminished AMO binding to MnO2, thus reducing AMO degradation in the pretest; therefore, all other experiments in this study were conducted without the addition of a buffer. Third-order rate constants, second-order on AMO and first-order on MnO2 increased with elevating pH level (2.81-7.23) from 0.54 to 9.17 M-2 s-1, and it decreased to 4.27 M -2 s-1 at pH 8.53 beyond the pka2 of AMO (7.3). The dissolution of the MnO2 suspension with and without AMO exhibited a similar trend; that is, Mn2+ concentration increased with decreasing pH. However, the dissolution of MnO2 with AMO was greater than that without AMO, except for the reaction occurring at pH 8.53, partially indicating that MnO2 acts as an oxidant in AMO degradation. The preliminary chromatogram data display different products with varying pH reaction s, implying that AMO elimination using this 1×1 molecular sieve-structured MnO2 is by adsorption as well as oxidative degradation. A complementary experiment indicates that the amount of oxidatively degraded AMO increases substantially from 65.5% at 4 h to 95% at 48 h, whereas the AMO adsorbed onto MnO2 decreases slightly from 4.5% at 4 h to 2.4% at 48 h. The oxidative degradation accounted for more AMO removal than adsorption over the whole reaction course, indicating that the oxidative reaction of AMO on MnO2 dominated the AMO removal.

原文英語
頁(從 - 到)2443-2451
頁數9
期刊Environmental Technology (United Kingdom)
34
發行號16
DOIs
出版狀態已發佈 - 八月 1 2013

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

指紋 深入研究「Degradation of antibiotic amoxicillin using 1×1 molecular sieve-structured manganese oxide」主題。共同形成了獨特的指紋。

引用此