有机酸对B-Fe/Ni降解阿莫西林的影响

为了研究水体中的有机酸对B-Fe/Ni（膨润土负载纳米铁/镍）降解阿莫西林的影响，以HA（腐殖酸）和EDTA（乙二胺四乙酸）作为研究对象，系统分析了不同质量浓度HA（0、10、50、100 mg/L）和EDTA（0、10、50、100 mg/L）对B-Fe/Ni降解阿莫西林的影响.以阿莫西林的降解率来考察HA和EDTA对B-Fe/Ni降解阿莫西林的效率产生的影响，并采用SEM（扫描电子显微镜）和XRD（X射线粉末衍射）等手段，探究了这两种有机酸对B-Fe/Ni降解阿莫西林产生影响的原因.结果表明:①当反应时间为10 min时，在HA质量浓度分别为0、10、50、100 mg/L的体系中，阿莫西林的降解率分别为63.6%、88.6%、87.3%、81.8%；②当反应时间为10 min时，在EDTA质量浓度分别为0、10、50、100 mg/L的的体系中，阿莫西林的降解率分别为63.6%、74.3%、65.7%、33.6%；③纳米铁在反应过程中被氧化为铁氧化物或氢氧化物沉淀，形成钝化层.研究显示，HA和EDTA在低质量浓度下会对B-Fe/Ni降解阿莫西林产生促进作用，而在高质量浓度下则会产生抑制作用. 

Effect of Organic Acid on Degradation of Amoxicillin in Aqueous Solution Using B-Fe/Ni

In order to study the influences of organic acids on degradation of amoxicillin using bentonite supported Fe/Ni (B-Fe/Ni), the effect of humic acid (HA) and ethylenediamine tetraacetic acid (EDTA) on degradation of amoxicillin was investigated. The effects of different mass concentrations of HA (0, 10, 50 and 100 mg/L) and EDTA (0, 10, 50 and 100 mg/L) on the degradation of amoxicillin by B-Fe/Ni were systematically analyzed. The materials were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results revealed that the degradation rates of amoxicillin in the systems containing 0, 10, 50, and 100 mg/L of mass concentration of HA were 63.6%, 88.6%, 87.3% and 81.8%, respectively under 10 minutes reaction time, while the degradation rates of amoxicillin in the systems containing 0, 10, 50, and 100 mg/L of mass concentration of EDTA were 63.6%, 74.3%, 65.7%, and 33.6%, respectively. The result of analysis of SEM and XRD showed that iron oxide or hydroxide precipitates and passivation layer formed as the reaction progress. HA and EDTA can promote the degradation of amoxicillin by B-Fe/Ni at low mass concentration of HA and EDTA, while inhibit the degradation of amoxicillin at high mass concentration.