膨润土负载纳米铁用于降解水体中阿莫西林

采用液相还原法合成膨润土负载纳米铁(B-nZVI)和纳米铁(nZVI)并用于降解水中的阿莫西林.实验结果表明,无论是单独nZVI还是B-nZVI都能有效降解阿莫西林.在25 mL浓度为20 mg.L-1的阿莫西林溶液中加入0.1 g的B-nZVI(其中nZVI的含量为0.05 g),溶液的初始pH值为6.65,摇床的振荡速率为250 r.min-1,反应温度为25℃,反应时间为120 min的条件下,B-nZVI对阿莫西林的降解效率高达93.1%,在此实验条件下,单独nZVI(0.05 g)对阿莫西林的降解效率只有82.3%,这是由于膨润土对nZVI起到分散作用,从而使B-nZVI的反应活性得到提高.降解动力学研究表明,B-nZVI对阿莫西林的降解过程符合表观一级反应动力学规律,相关系数R2均大于0.945.B-nZVI可多次重复用于降解阿莫西林.

Degradation of amoxicillin using bentonite supported nanoscale zero-valent iron

Bentonite supported nanoscale zero-valent iron(B-nZVI) and nanoscale zero-valent iron(nZVI) were synthesized and used for the degradation of an antibiotic amoxicillin.The results show that amoxicillin in aqueous solution was degraded effectively by both B-nZVI and nZVI.However,at an initial amoxicillin concentration of 20 mg · L-1and solid concentration of 4.0 g · L-1,93.1% of amoxicillin was degraded by B-nZVI,whilst only 82.3% of amoxicillin was removed by solid concentration of 2.0 g · L-1 nZVI(pH=6.65,25 ℃) in 120 min.The difference was attributed to the use of bentonite as a supporting material,which resulted in a decrease in the aggregation of nZVI and a corresponding increase in the reactivity of nZVI.The removal of amoxicillin was consistent with pseudo first-order reaction kinetics and the correlation coefficient was above 0.945.It was also observed that B-nZVI was re-useable.