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《Journal of Safety and Environment》 2012-02
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Adsorptivity of amoxicillin from the aqueous solutions with organic bentonite

ZHA Shuang-xing,ZHOU Yan,JIN Xiao-ying,CHEN Zu-liang(College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350108,China)  
This paper is concerned about our research report of the adsorptivity of amoxicillin from the aqueous solutions with the help of organic bentonite.As a technical process,amoxicillin is a widely used in penicillin-like antibiotic,though its residue may have toxic impact on the algae and other lower organisms within the food chain.Adsorption,as a chemical process to remove contaminants from water and/or other liquids,has also been widely used in modern technology.So far as we know,of the four bentonites,DK1 modified with hexadecyl trimethyl ammonium is generally regarded as the most effective absorbent.The removal percentages of amoxicillin account for 97.9 and 13.8% for DK1 and NaB,respectively.More modified bentonite proves much more effective than unmodified one.The conditions influencing the adsorption of DK1 for amoxicillin may include the contact time,pH value,the initial concentration and temperature,dosage to be used,etc.The results of our batch adsorption experiments indicate that under the natural pH,the adsorption of DK1 can reach its equilibrium quickly in a period of time of 15 min,with pH being a crucial factor that may affect the adsorption.However,with the increase of amoxicillin and the dosage from 1 to 15 g/L,the adsorption capacity(qe) tends to decrease.The dynamic adsorption can well be described by the pseudo second-order-rate model at various temperatures,with the kinetic constant being 0.022 5 g/(mg·min).The adsorption process and data also prove to be in conformity with the Freundlich,Langmuir and Temkin adsorption isotherm.More exactly speaking,Langmuir isotherm suggests that the optimal adsorption capacities of 27.86 mg/g has been found at 30 ℃.The thermodynamic par suggests that the adsorption of amoxicillin onto DK1 was physisorptive,spontaneous and endothermic in nature.The adsorption is caused actually by the amoxicillin interactions with surfactant cations on the clay's surface as well as within the clay interlayer space.Further elaboration can also be able to reveal a few more likely mechanisms for the adsorption systems.And,finally,it can be found that less than 5% of amoxicillin was desorbed from DK1,for organobentonites are good adsorbent and,therefore,its adsorptivity is both feasible in actual sewage purification and beneficial for the study of desorption and actual sewage treatment.
【Fund】: 福建省发改委2009专项基金项目(闽发改高技[2009]608号 UE0021);; 福建师范大学闽江学者人才引进基金项目(200604)
【CateGory Index】: X50
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