首页|Decomposition mechanism of chloramphenicol under electron beam irradiation

Decomposition mechanism of chloramphenicol under electron beam irradiation

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The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol(CAP)in aqueous solutions.At the absorbed dose of 15 kGy,the decomposition rate of CAP was 95.24%.The degradation of CAP under electron beam irradiation followed pseudo-first-order kinetics.Redox reactions of CAP aqueous solutions with hydroxyl radicals(·OH),hydrated electrons(e-aq)and hydrated atoms(·H)were studied.The increase of the additives would result in the decrease of the degradation efficiency.The concentration of Cl-and NO3-in aqueous solution increased after electron beam irradiation.On the basis of the experimental results,a photocatalytic mechanism was discussed.The rate constant for reactions of ·OH and CAP was 9.36×107 L/(mol·s)and for reaction of e-aq and CAP was 7.33×107 L/(mol·s).·OH was supposed to play the key role in the radiation system of aqueous solution.Other free radicals like e-aq and ·H could also initiate the degradation.

chloramphenicol(CAP)electron beamirradiationmechanism

ZHOU Jia-xin、WU Ming-hong、XU Gang、REN Lai-tang、TANG Liang、BAI Yu-lei

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School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,P.R.China

国家自然科学基金国家自然科学基金Shanghai Leading Academic Discipline ProjectNational Key Technology Research and Development Program in the 11th Five Year Plan of ChinaNational Key Technology Research and Development Program in the 11th Five Year Plan of ChinaNatural Science Foundation of Shanghai MunicipalityNatural Science Foundation of Shanghai Municipality

4097307340830744S301092008BAC32B032009BAA24B0409ZR141130009XD1401800

2010

10.1007/s11741-010-0645-3

上海大学学报(英文版)
上海大学

上海大学学报(英文版)

影响因子：0.196
ISSN：1007-6417
年,卷(期)：2010.14(4)
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