美托洛尔在沉积物与活性污泥上的吸附行为

发布时间：2018-01-08 14:37

本文关键词：美托洛尔在沉积物与活性污泥上的吸附行为　出处：《环境化学》2016年12期 　论文类型：期刊论文

【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p H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]:Beta blockers Mei TORO M is the most commonly used drugs for the treatment of hypertension, with the sewage into the sewage treatment system is difficult to completely remove the influence of ecological environment, the adsorption is one of the effective methods to remove Mei TORO M. Mei TORO M to assess the effects of media on the adsorption behavior, using batch processing method, discussed the adsorption time, initial the concentration of P solution, H value, temperature and other conditions in Mei TORO M sewage treatment plant activated sludge, adsorption of sediment from the Pearl River and lake sediments. The results show that the adsorption process of 3 kinds of media on adsorption of dexmedetomidine showed in rapid slow trend, the adsorption equilibrium time is about 4 h and is not affected by the initial concentration Mei TORO M; acidic conditions promote adsorption on the medium, the increase of the ionic strength can inhibit the adsorption of Mei TORO M Mei TORO M; in 3 kinds of adsorption on the medium Kinetics of adsorption process followed the pseudo two order kinetics model of adsorption, the adsorption constant of 11.63 - 66.74 Mg (G - min) ~ (-1). The adsorption process includes physical adsorption and chemical adsorption and chemical adsorption, the adsorption reaction than particle diffusion, film diffusion effect on adsorption is more significant, is the controlling step of the reaction due to the adsorption medium. Cation exchange capacity and organic matter content of different adsorption isotherms of 3 kinds of media on adsorption of Mei TORO M with different models; thermodynamic experiments show that different media on the Mei TORO M adsorption are spontaneous exothermic reaction. The results can provide data support for Mei TORO M in natural environment of removal technology and environment risk assessment.

【作者单位】：华南理工大学环境与能源学院;
【基金】：国家自然科学基金(51178190) 广州市科信局项目(2013J4100107)资助~~
【分类号】：X703
【正文快照】： Supported by the National Natural Science Foundation of China(51178190)and the Research Found of SIT of Guangzhou(2013J4100107).**通讯联系人,Tel:020-39380588,E-mail:ceyren@scut edu.cnCorresponding author,Tel:020-39380588,E-mail:ceyren@scut edu.cn药品和个

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