湖北农业科学 ›› 2022, Vol. 61 ›› Issue (23): 69-73.doi: 10.14088/j.cnki.issn0439-8114.2022.23.012

• 植物保护 • 上一篇    下一篇

椰壳活性炭对百草枯的吸附研究

范凯轩, 李孟值, 谢尚宏, 冯小云, 李涛, 梁珍, 鲍继海   

  1. 巴中职业技术学院医学院/基础医学教研室,四川 巴中 636601
  • 收稿日期:2021-12-13 出版日期:2022-12-10 发布日期:2023-01-27
  • 通讯作者: 鲍继海,主任医师,教授,主要从事内科诊疗、医院管理及职业医学教育研究,(电子信箱)768331307@qq.com。
  • 作者简介:范凯轩(1987-),男,陕西兴平人,硕士,主要从事药学研究,(电话)029-38415154(电子信箱)378259066@qq.com。

Study on adsorption of paraquat by coconut shell activated carbon

FAN Kai-xuan, LI Meng-zhi, XIE Shang-hong, FENG Xiao-yun, LI Tao, LIANG Zhen, BAO Ji-hai   

  1. Department of Basic Medicine/Medical College, Bazhong Vocational Technical College, Bazhong 636601,Sichuan,China
  • Received:2021-12-13 Online:2022-12-10 Published:2023-01-27

摘要: 采用分批吸附技术,研究硝酸改性后的椰壳炭对百草枯去除能力的影响因素及机理。以YK-6为研究对象,研究了pH、转速、投加量、温度和初始浓度的影响。从动力学数据来看,将6 h作为测定吸附等温试验的平衡时间。将吸附数据拟合到Langmuir、Freundlich、Temkin和Brouers-Sotolongo(BS)吸附等温模型中,在pH 为2~9时,吸附作用随着pH的增加而增加,这是百草枯分子与椰壳炭表面的酸性官能团亲和力增加的结果;通过阿仑尼乌斯公式拟合计算,发现该过程具有明显的化学吸附作用;BS等温线模型描述的吸附过程,在37 ℃下测定的BS模型最大吸附能为88.47 mg/g;应用Lagergren准一级、Lagergren准二级、Elovich和Avrami模型拟合动力学结果,发现Avrami模型最适合。

关键词: 百草枯, 吸附, 等温线, 动力学模型

Abstract: The influencing factors and mechanism of paraquat removal by coconut shell charcoal modified by nitric acid were studied by batch adsorption technology. The effects of pH, rotational speed, dosage, temperature and initial concentration of YK-6 were studied. From the kinetic data, 6 h was used as the equilibrium time to determine the adsorption isotherm test. The adsorption data were fitted to Langmuir, Freundlich, Temkin and Brouers-Sotolongo (BS) adsorption isotherm models. When the pH was 2~9, the adsorption increased with the increase of pH, which was the result of the increase of the affinity between paraquat molecules and acidic functional groups on the surface of coconut shell carbon. Through Arrhenius formula fitting calculation, it was found that the process had an obvious chemical adsorption effect. BS isotherm model describes the adsorption process, the maximum adsorption energy of BS model measured at 37 ℃ was 88.47 mg/g. The Lagergren quasi-first-order, Lagergren quasi-second-order, Elovich and Avrami models were used to fit the kinetic results, and it was found that the Avrami model was the most suitable.

Key words: paraquat, adsorption, isothermal lines, dynamic model

中图分类号: