聚苯乙烯微塑料材料对抗生素的吸附行为研究

STUDY ON THE ADSORPTION BEHAVIOR OF POLYSTYRENE MICROPLASTICS TO ANTIBIOTICS

李冠融

11930307

硕士

材料工程

裘文慧

2021-05-14

2021-06-04

南方科技大学

深圳

环境中抗生素污染日益严重，在各种环境中均被检出，在很多环境中和生物体内也都检测到了微塑料的存在。微塑料和抗生素污染是新兴的环境、人类和动物健康威胁。微塑料由于其较大的比表面积，对环境中的污染物有着较强的吸附作用，微塑料可能会吸附环境中的抗生素进入生物体内。因此，对于微塑料对于不同种抗生素的吸附能力亟待研究。本论文以不同粒径聚苯乙烯（PS）微塑料为研究对象，选用了3类共8种不同的抗生素。通过不同粒径PS微塑料的吸附8种抗生素实验，研究不同粒径对于微塑料吸附速率和吸附容量的影响，以及微塑料对不同抗生素污染物的吸附特征。同时，通过改变溶液的离子强度和pH值，研究两者对于吸附的影响。PS微塑料对三种磺胺类抗生素的吸附能力总体随着粒径的减小而增大，对于磺胺甲恶唑和磺胺嘧啶两种抗生素的吸附情况相似。离子强度和酸碱环境对磺胺类抗生素吸附影响不大。喹诺酮类抗生素较不稳定，溶液浓度变化曲线波动较大，但吸附能力也相对较强。在三种喹诺酮类抗生素里，离子强度显著促进了PS微塑料对诺氟沙星的吸附；而环丙沙星和恩诺沙星受离子强度的影响不大。而PS微塑料对同属于四环素类的四环素和金霉素两种抗生素的吸附存在较大差异，对于金霉素的吸附能力显著强于四环素。在PS微塑料吸附动力学的研究中，发现PS微塑料对于抗生素的吸附动力学更接近于拟一阶动力学。其中，对于磺胺二甲嘧啶和金霉素的拟合效果相对其他抗生素较好。在实际环境中污染物复杂多样，多种污染物吸附平衡存在共同促进或制约的作用，需要研究多种污染物之间可能存在的关系，确定能共同促进或相互制约的污染物的特性。

Antibiotic pollution is becoming more and more serious in the environment, and has been detected in a variety of environments. Microplastics have also been detected in many environments and organisms. Microplastics and antibiotic contamination are emerging threats to environment, human and animal health. Due to its large specific surface area, microplastics have a strong adsorption effect on pollutants in the environment, and microplastics may absorb antibiotics in the environment into organisms. Therefore, it is urgent to study the adsorption capacity of microplastics for different kinds of antibiotics. In this paper, polystyrene (PS) microplastics with different particle sizes were used as the research object. A total of 8 kinds of antibiotics in 3 classes were selected. The effects of different particle sizes on the adsorption rate and capacity of microplastics, as well as the adsorption characteristics of microplastics to different antibiotic pollutants, were studied through the experiments of PS microplastics with different particle sizes on the adsorption of 8 kinds of antibiotics. At the same time, by changing the ionic strength and pH value of the solution, the effects of the two on adsorption were studied.The adsorption capacity of PS microplastics for the three sulfonamides antibiotics increased with the decrease of particle size, and the adsorption conditions for SDZ and SMX antibiotics were similar. Ionic strength and acid-base environment had little effect on sulfonamides adsorption. Quinolone antibiotics are more unstable, the curve of solution concentration fluctuation is larger, but the adsorption capacity is also relatively strong. Among the three quinolones, ionic strength significantly promoted the adsorption of NOR by PS microplastics. CIP and ENR were not affected by ionic strength. However, PS microplastics have a great difference in adsorption of TC and CTC antibiotics, both belonging to tetracycline, and the adsorption capacity of CTC is significantly stronger than that of TC. In the study of the adsorption kinetics of PS microplastics, it was found that the adsorption kinetics of PS microplastics for antibiotics was closer to the pseudo-first-order kinetics. Among them, the imitative effect of sulfadimethylpyrimidine and aureomycin was better than other antibiotics. In the actual environment, the pollutants are complex and diverse, and the adsorption equilibrium of a variety of pollutants can promote or restrict together. Therefore, it is necessary to study the possible relationship between a variety of pollutants and determine the characteristics of pollutants that can promote or restrict together.

聚苯乙烯微塑料 抗生素 吸附动力学 影响因素

polystyrene microplastics antibiotics adsorption kinetics factor

中文

独立培养

南方科技大学

李冠融. 聚苯乙烯微塑料材料对抗生素的吸附行为研究[D]. 深圳. 南方科技大学,2021.