摘要
采用天然铁电气石作为吸附剂去除水中的恩诺沙星,考察了p H值、干扰离子对吸附性能的影响,并探讨了吸附热力学及动力学特性。结果表明:p H为5的条件下,吸附量最大,为7.13 mg·g^(-1);ΔG<0且ΔH>0表明吸附是自发进行的吸热反应,ΔH=2.048 k J·mol^(-1)(<20 k J·mol^(-1))说明吸附为物理吸附。等温吸附曲线拟合中,Freundlich模型拟合效果较好。电气石对恩诺沙星的吸附过程符合拟二级动力学。脱附实验表明,电气石具有较好的脱附再生性能,脱附率可达99%。初始p H为5时,较高浓度的Cu^(2+)和Zn^(2+)对恩诺沙星的吸附均有抑制作用,Cu^(2+)的抑制作用明显高于Zn^(2+),且干扰离子浓度越高抑制作用越强;p H为7时,低浓度的干扰离子能够促进恩诺沙星的吸附。
Schorl was used as the adsorbent for enrofloxacin removal from water. The effects of p H and interfering ions on the adsorption were investigated. In addition,the thermodynamics and kinetics characteristics of the adsorption were discussed. The results demonstrated that when the initial p H was 5,the maximum adsorption capacity was 7. 13 mg·g^-1. The negative ΔG value and positive ΔH value indicated that the adsorption process was spontaneous and endothermic. ΔH was equal to 2. 048 k J·mol^-1（ 20 k J·mol^-1）,indicative of physical adsorption. The Freundlich and pseudo-second order kinetic models could well describe the experimental data,indicating that schorl had a good desorption and regeneration performance. The desorption rate reached 99%.When the initial p H was 5,the presence of Cu^2＋and Zn^2＋had a negative effect on the enrofloxacin adsorption,and the inhibition from Cu^2＋was significantly higher than that due to Zn^2＋. The higher ion concentration resulted in stronger inhibition. When the p H was 7,interfering ions at low concentration could promote the enrofloxacin adsorption.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第4期2183-2189,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51408612)
江苏省自然科学基金资助项目(BK20140660)
中央高校基本科研业务费专项资金(2015PT002)
