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Kinetic assessment of the potassium ferrate(VI) oxidation of antibacterial drug sulfamethoxazole [An article from: Chemosphere]
Book Details
Author(s)V.K. Sharma, S.K. Mishra, A.K. Ray
PublisherElsevier
ISBN / ASINB000RR5IT4
ISBN-13978B000RR5IT7
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Chemosphere, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Sulfamethoxazole (SMX), a worldwide-applied antibacterial drug, was recently found in surface waters and in secondary wastewater effluents, which may result in ecotoxical effects in the environment. Herein, removal of SMX by environmentally-friendly oxidant, potassium ferrate(VI) (K"2FeO"4), is sought by studying the kinetics of the reaction between Fe(VI) and SMX as a function of pH (6.93-9.50) and temperature (15-45^oC). The rate law for the oxidation of SMX by Fe(VI) is first-order with respect to each reactant. The observed second-order rate constant decreased non-linearly from 1.33+/-0.08x10^3M^-^1s^-^1 to 1.33+/-0.10x10^0M^-^1s^-^1 with an increase of pH from 7.00 to 9.50. This is related to protonation of Fe(VI) (HFeO"4^-@?H^++FeO"4^2^-; pK"a","H"F"e"O"""4=7.23) and sulfamethoxazole (SH@?H^++S^-; pK"a","S"H=5.7). The estimated rate constants were k"1"1(HFeO"4^-+SH)=3.0x10^4M^-^1s^-^1, k"1"2(HFeO"4^-+S^-)=1.7x10^2M^-^1s^-^1, and k"1"3(FeO"4^2^-+SH)=1.2x10^0M^-^1s^-^1. The energy of activation at pH 7.0 was found to be 1.86+/-0.04kJmol^-^1. If excess potassium ferrate(VI) concentration (10@mM) is used than the SMX in water, the half-life of the reaction using a rate constant obtained in our study would be approximately 2min at pH 7. The reaction rates are pH dependent; thus, so are the half-lives of the reactions. The results suggest that K"2FeO"4 has the potential to serve as an oxidative treatment chemical for removing SMX in water.
Description:
Sulfamethoxazole (SMX), a worldwide-applied antibacterial drug, was recently found in surface waters and in secondary wastewater effluents, which may result in ecotoxical effects in the environment. Herein, removal of SMX by environmentally-friendly oxidant, potassium ferrate(VI) (K"2FeO"4), is sought by studying the kinetics of the reaction between Fe(VI) and SMX as a function of pH (6.93-9.50) and temperature (15-45^oC). The rate law for the oxidation of SMX by Fe(VI) is first-order with respect to each reactant. The observed second-order rate constant decreased non-linearly from 1.33+/-0.08x10^3M^-^1s^-^1 to 1.33+/-0.10x10^0M^-^1s^-^1 with an increase of pH from 7.00 to 9.50. This is related to protonation of Fe(VI) (HFeO"4^-@?H^++FeO"4^2^-; pK"a","H"F"e"O"""4=7.23) and sulfamethoxazole (SH@?H^++S^-; pK"a","S"H=5.7). The estimated rate constants were k"1"1(HFeO"4^-+SH)=3.0x10^4M^-^1s^-^1, k"1"2(HFeO"4^-+S^-)=1.7x10^2M^-^1s^-^1, and k"1"3(FeO"4^2^-+SH)=1.2x10^0M^-^1s^-^1. The energy of activation at pH 7.0 was found to be 1.86+/-0.04kJmol^-^1. If excess potassium ferrate(VI) concentration (10@mM) is used than the SMX in water, the half-life of the reaction using a rate constant obtained in our study would be approximately 2min at pH 7. The reaction rates are pH dependent; thus, so are the half-lives of the reactions. The results suggest that K"2FeO"4 has the potential to serve as an oxidative treatment chemical for removing SMX in water.
