| 复合磁性纳米凝胶球对典型抗生素的吸附特性 |
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| 引用本文： | 曾子君,梁莹,荣宏伟,骆华勇,廖权.复合磁性纳米凝胶球对典型抗生素的吸附特性[J].环境工程,2022,40(5):59-66. |
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| 作者姓名： | 曾子君 梁莹 荣宏伟 骆华勇 廖权 |
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| 作者单位： | 广州大学 土木工程学院, 广州 510006 |
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| 基金项目： | 国家自然科学基金项目(51778155,51608133)；;广东省自然科学基金项目(2020A1515010856)； |
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| 摘 要： | 以复合磁性纳米凝胶球(Fe3O4@PVA-SA-PAC)为吸附剂,探究其对水中磺胺甲噁唑(SMX)、环丙沙星(CIP)、甲氧苄啶(TMP)抗生素类污染物去除效果,并分析pH、投加量、污染物初始浓度、吸附时间等因素对吸附过程的影响。结果表明:pH=3时最有利于抗生素吸附;吸附量随着初始浓度增大而上升,随着投加量增加而下降;3种抗生素吸附表现为物理吸附和化学吸附共存、均质单分子层吸附与非均质多分子层吸附共同作用的状态。其中SMX与CIP吸附更符合准二级动力学模型,而TMP更符合准一级动力学模型;温度为308 K时,Langmuir与Freundlich方程均达到较高拟合度(0.938≤R2≤0.998),此时SMX、TMP和CIP的最大吸附量分别为47.188,59.649,96.468 mg/g;竞争性吸附试验表明复合凝胶球可同时吸附多种目标抗生素污染物,具备良好吸附应用前景。
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| 关 键 词： | 抗生素 磁性纳米凝胶球 吸附剂 竞争性吸附 |
| 收稿时间： | 2021-05-03 |
ADSORPTION PROPERTIES OF TYPICAL ANTIBIOTICS BY COMPOSITE MAGNETIC NANO-GEL BEADS |
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| Affiliation: | School of Civil Engineering, Guangzhou University, Guangzhou 510006, China |
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| Abstract: | The removal efficiency of antibiotic pollutants such as sulfamethoxazole(SMX), ciprofloxacin(CIP) and methoxyphenidine(TMP) were studied using magnetic nano-gel beads(Fe3O4@PVA-SA-PAC) composite, and the influences of pH, dosage, initial concentration of pollutants and adsorption time on the adsorption process were analyzed. The result showed that pH=3 was the optimal condition. The adsorption capacity increased with the increase of initial concentration and decreased with the increase of dosage. The adsorption of these three antibiotics by Fe3O4@PVA-SA-PAC showed the coexistence of physical and chemical adsorption, also homogeneous monolayer adsorption and heterogeneous multi-molecular layer adsorption. The adsorption of SMX and CIP was more consistent with the pseudo-first-order kinetic model, while TMP was more consistent with the pseudo-second-order kinetic model. At 308 K, both the Langmuir equation and Freundlich equation reached a high fitting degree(0.938 ≤ R2 ≤ 0.998). By now, the maximum adsorption capacity of SMX, TMP and CIP were 47.188 mg/g, 59.649 mg/g and 96.468 mg/g, respectively. Competitive adsorption experiments showed that the composite gel beads could simultaneously adsorb a variety of target antibiotic pollutants, indicating a good application prospect of adsorption. |
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