美托洛尔在沉积物与活性污泥上的吸附行为
Adsorption behaviors of metoprolol onto sediments and activated sludge
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摘要: β-受体阻滞剂美托洛尔是最常用的临床治疗高血压药物，随生活污水进入污水处理系统后难以完全去除而影响生态环境，吸附是去除美托洛尔的有效方法之一.为评估美托洛尔在不同介质上的吸附行为，采用批平衡处理方法，分别探讨了吸附时间、初始浓度、溶液pH值、温度等条件下美托洛尔在污水处理厂活性污泥、珠江沉积物和湖泊沉积物上吸附行为.结果表明，3种吸附介质对美托洛尔的吸附过程均表现为先快速后缓慢的趋势，吸附平衡时间约为4 h且不受初始浓度的影响；酸性条件促进美托洛尔在介质上的吸附，离子强度的增大会抑制美托洛尔的吸附；美托洛尔在3种吸附介质上的动力学吸附过程符合伪二级动力学吸附模型，吸附常数为11.63-66.74 mg·（μg·min）-1.吸附过程包括物理吸附与化学吸附且以化学吸附为主，吸附反应比颗粒扩散、液膜扩散对吸附的影响更为显著，是反应的控制步骤.由于吸附介质的阳离子交换量和有机质含量的不同，3种吸附介质对美托洛尔的吸附等温线符合不同的拟合模型；热力学实验表明不同介质对美托洛尔吸附均为自发的放热反应.研究结果可为美托洛尔在天然环境中的去除技术和环境风险评价提供数据支撑.Abstract: Metoprolol is the most commonly used β-blockers for hypertension currently, which is difficult to be completely removed when discharging into municipal wastewater treatment system and thus greatly endangers the ecological environment. Adsorption is one of the effective methods for metoprolol removal. In this study, batch adsorption method was applied to assess the adsorption behavior of metoprolol onto different media. Effects of adsorption time, initial concentration, solution pH, and temperature on metoprolol adsorption onto sewage sludge, Pearl River sediment, and lake sediment were investigated. Results showed that the adsorption process of metoprolol onto the three media was a two-step process:a rapid adsorption followed by a slow one. The initial concentration of metoprolol had little impact on equilibrium time which was about 4 hours. Furthermore, acidic condition had have a significant effect on the adsorption behaviors of metoprolol, while the increase of ionic strength inhibited adsorption. The adsorption process followed the pseudo-second-order model, with adsorption rate in the range of 11.63-66.74 mg·(μg·min)-1. Meanwhile, adsorption process included physical adsorption, and chemical adsorption and the latter was the dominant process. The control steps in the adsorption reactions of metoprolol absorbed by 3 different media was adsorption reaction. Due to the difference in cation exchange capacity and organic matter content of the adsorption media, the adsorption isotherms of the three media fitted different models. The results revealed that all the adsorptions were spontaneous exothermic reaction based on thermodynamic experiment. The results are expected to provide data support for removal technology of metoprolol in the natural environment and environmental risk assessment.
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Key words:
- metoprolol /
- sediment /
- activated sludge /
- adsorption behavior
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