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过程工程学报 ›› 2022, Vol. 22 ›› Issue (6): 734-744.DOI: 10.12034/j.issn.1009-606X.221080

• 研究论文 • 上一篇    下一篇

Fe3O4@SA/CTS凝胶球对亚甲基蓝及碱性品红的吸附

聂发辉1， 吴道1， 黄慧倩1， 徐志威1， 吴钦1， 刘占孟2*   

  1. 1. 华东交通大学土木建筑学院，江西 南昌 330013 2. 南昌工程学院土木建筑学院，江西 南昌 330013
  • 收稿日期:2021-03-09 修回日期:2021-08-19 出版日期:2022-06-28 发布日期:2022-06-28
  • 通讯作者: 刘占孟 ustblzm@sina.com
  • 作者简介:聂发辉(1977-)，江西省南昌市人，男，博士，副教授，研究方向：水污染控制工程，E-mail: 50124165@qq.com；通讯联系人，刘占孟， E-mail: ustblzm@sina.com.
  • 基金资助:
    农林废弃生物质改性及吸附重金属离子性能研究（江西省教育厅，科学技术研究项目，GJJ90340）

Adsorption of methylene blue and basic fuchsin on Fe3O4@SA/CTS gel ball

Fahui NIE1,  Dao WU1,  Huiqian HUANG1,  Zhiwei XU1,  Qin WU1,  Zhanmeng LIU2*   

  1. 1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China 2. School of Civil Engineering and Architecture, Nanchang Institute of Technology, Nanchang, Jiangxi 330013, China
  • Received:2021-03-09 Revised:2021-08-19 Online:2022-06-28 Published:2022-06-28

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摘要： 为解决染料对水体污染问题，本工作以海藻酸钠为骨架，结合Fe3O4及壳聚糖，制备了Fe3O4@SA/CTS凝胶球，并对制备的材料进行了微观表征。研究了不同影响因素下，吸附剂对MB及CB的吸附效果，同时研究了不同pH下对混合液的吸附性能，以及吸附剂循环利用性实验。结果表明，MB或CB初始浓度为100 mg/L、吸附剂投加量为1.0 g/L、MB的pH为11或CB的pH为8、反应时间4 h、MB和CB的去除率分别可以达到91.9%和21.5%。Langmuir模型能够更好反应对MB或CB的吸附，吸附以单分子物理吸附为主。吸附动力学符合伪二级动力学方程，吸附过程更容易受到化学吸附影响。不同pH下，Fe3O4@SA/CTS对混合液中的MB吸附优于CB，5次脱附循环使用后对MB保持在70%以上，对CB的去除率保持在15%以上。

关键词: 海藻酸钠, 阳离子染料, 吸附, 共存染料, 壳聚糖, 磁性

Abstract: As we all know, the methylene blue and basic fuchsin in the printing and dyeing wastewater are harmful to the human body. In this work, Fe3O4@SA/Ca adsorbents were prepared with sodium alginate as the skeleton, and Fe3O4 was combined with chitosan and CaCl2 as the cross-linking agent to remove these two pollutants. A series of microscopic characterizations of the prepared materials were carried out, such as XRD, SEM, FT-IR, VSM, etc. The effects of single factors such as pH, adsorbent dosage, reaction time, and initial concentration of substrate on the adsorption process were considered. The isotherm model and kinetic equation model were established to study the adsorption mechanism. The adsorption of methylene blue and basic fuchsin by the adsorbent at different pH was studied. Finally, the adsorption performance of the adsorbent for methylene blue or basic fuchsin for five consecutive times was investigated. The results showed that the material was successfully prepared, and the appearance was wrinkled. There were a large number of oxygen-containing functional groups on the surface of the molecular structure, and the material had strong magnetic properties. When the initial concentration of methylene blue or basic fuchsin was 100 mg/L, the dosage of adsorbent was 1.0 g/L, the pH of methylene blue was 11 or the pH of basic fuchsin was 8, and the reaction time was 4 h, the removal rate of the two kinds of pollutants by the material could reach 91.9% and 21.5%, respectively. It was obvious that the adsorption of methylene blue by the adsorbent was stronger than the adsorption of basic fuchsin. The fitting results showed that the Langmuir model can better reflect the adsorption of methylene blue or basic fuchsin, and the adsorption was dominated by a single-layer surface covering. The adsorption kinetics conforms to the pseudo-second-order kinetic equation, and the adsorption process was more susceptible to chemical adsorption. When the pH=9, the adsorption capacity for methylene blue was 82.6 mg/g, and the adsorption capacity for basic fuchsin was 36.6 mg/g. Five consecutive desorption and regeneration experiments proved that the Fe3O4@SA/CTS adsorbent was desorbed and regenerated under 0.1 mol of HCl, and it has good reusability.

Key words: Sodium alginate, Cationic dyes, adsorption, Coexisting Dyes, chitosan, magnetic