摘要
针对养殖业受抗生素污染水体,以花生壳为原料、NaOH为改性剂制备吸附剂,选择有代表性的3种四环素类抗生素(土霉素、四环素和强力霉素)进行静态吸附实验,考察吸附时间、初始浓度、pH、阳离子强度对吸附性能的影响。结果表明,改性花生壳对3种抗生素的吸附在12h时基本达到平衡,该吸附过程能够较好地被准二级动力学模型和Langmuir等温吸附模型拟合。当pH由2升高至10时,抗生素吸附量先增加后减少,在pH为5～7时吸附效果尤为显著。共存阳离子的存在影响吸附效果,随着Ca2+浓度的升高,改性花生壳对3种抗生素的吸附作用逐渐减弱。
Batch static experiments were carried out to removal three tetracycline antibiotics （oxytetracycline, tetracycline and doxycycline） from aqueous solution by adsorption on NaOH modified peanut hull. The effect of ad- sorption time, initial antibiotics concentration, pH and competitive cation strength on adsorption capacity was investi- gated comprehensively. The results showed that the adsorption of three tetracycline antibiotics reached equilibrium basically in 12 h, and the adsorption process could be well described by pseudo-second order kinetic model and Lang- muir adsorption isotherm. When the solution pH increased from 2 to 10, the adsorption quantity of antibiotics in- creased first and then reduced, the modified peanut hull presented perfect adsorption capacity especially in weak acidic environment. The existence of cation had negative effect on antibiotics adsorption on peanut hull, and the higher the cation concentration, the greater impact to antibiotics adsorption capacity.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第5期35-39,44,共6页
Environmental Pollution & Control
基金
国家水体污染控制与治理科技重大专项(No.2008ZX07101-006-05)
关键词
花生壳
四环素类抗生素
吸附
peanut hull tetracycline antibiotics adsorption
