2种氟喹诺酮类抗生素在水产养殖区沉积物上的吸附和解吸行为研究
Adsorption and Desorption Behavior of Two Fluoroquinolones Antibiotics on Aquaculture Sediments
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摘要: 为了了解养殖塘沉积物对抗生素的吸附行为，选取恩诺沙星(enrofloxacin, ENR)和诺氟沙星(norfloxacin, NOR)这2种典型的氟喹诺酮类抗生素(fluoroquinolones, FQs)，研究了它们在养殖塘沉积物上的吸附/解吸特征及其影响因素。结果表明，ENR和NOR在养殖塘沉积物上的吸附过程较快，16 h已达到平衡，吸附常数(Kd)能达到3 213.72 L·kg-1和9 231.79 L·kg-1，Langmuir和Freundlich均能够较好地拟合沉积物对ENR和NOR的等温吸附过程，解吸过程存在明显的滞后现象；ENR和NOR在沉积物上的吸附量与pH整体呈负相关，解吸量与pH呈正相关；不同沉积物中有机质对ENR和NOR的吸附均有较大的贡献，金属氧化物中铁氧化物对ENR和NOR的吸附贡献明显高于锰氧化物；共存离子中，除Zn2+外，随着离子强度的增加，吸附量都呈现逐渐减少的趋势，且二价离子存在时抗生素的吸附常数明显低于单价离子，解吸均表现为随着吸附率的增加而减少。本研究对抗生素的环境风险评估和污染控制具有重要的意义。Abstract: In order to understand the adsorption behavior of antibiotics on the sediment of aquaculture ponds, this research selected two typical fluoroquinolones (FQs), enrofloxacin (ENR) and norfloxacin (NOR), to study their adsorption/desorption characteristics and the influencing factors. Our results showed that the adsorption of ENR and NOR reached equilibrium from the 16th hour, and the adsorption constant (Kd) reached 3 213.72 L·kg-1 and 9 231.79 L·kg-1. Both Langmuir and Freundlich could well fit the isothermal adsorption process of ENR and NOR on sediments, and obvious hysteresis were observed during the desorption processes. An negative correlation was detected between the adsorption capacities of the two antibiotics and the pH, while an positive correlation was detected between the desorption capacities and the pH. The organic matters in different sediments contributed greatly to the adsorption of ENR and NOR. It has been found that the adsorption contribution rate of iron oxide to ENR and NOR was significantly higher than that of manganese oxide. Except Zn2+, for other examined coexisting ions, their adsorption capacities decrease with the increase of the ionic strength. During co-existence, the adsorption constant of divalent ions was obviously lower than that of monovalent ions. According to the desorption regularity, it is found that the desorption rates decrease with the increase of the adsorption rates. This study is of great significance for environmental risk assessment and pollution control of antibiotics.
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Key words:
- fluoroquinolones /
- sediment /
- adsorption /
- desorption
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