Industrial Water Treatment ›› 2023, Vol. 43 ›› Issue (4): 130-138. doi: 10.19965/j.cnki.iwt.2022-0485

• RESEARCH AND EXPERIMENT • Previous Articles     Next Articles

Study on the adsorption performance of sulfathiazole by Coffea Arabica L. husk-derived biochar

Xiaojiao LI1,2,3(), Jianli YANG1, Kaihong CAO1,3, Yujie WANG1,3, Jianmin HE1,3   

  1. 1.School of Resources and Environment,Baoshan University,Baoshan 678000,China
    2.School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China
    3.Key Laboratory of High-value Conversion and Utilization of Biomass Resources in Nujiang River Valley for Colleges and Universities of Yunnan Province,Baoshan 678000,China
  • Received:2023-03-11 Online:2023-04-20 Published:2023-05-23

小粒咖啡果壳生物炭对水中磺胺噻唑吸附性能研究

李晓娇1,2,3(), 杨建丽1, 曹凯红1,3, 汪玉洁1,3, 何健民1,3   

  1. 1.保山学院资源环境学院,云南 保山 678000
    2.西安交通大学能源与动力工程学院,陕西 西安 710049
    3.云南省高校怒江河谷生物质资源高值转化与利用重点实验室,云南 保山 678000
  • 作者简介:李晓娇(1985— ),硕士,副教授,E-mail:lixiaojiao0622@163.com
  • 基金资助:
    云南省2018年高校本科教育教学改革研究项目(JG2018225);2018国家级大学生创新训练项目(201810686002)

Abstract:

To solve the problem of antibiotic pollution in water bodies, biochar MCS-1 was prepared by oxygen-limited lysis at 500 ℃ using Coffea Arabica L. husk as raw material, and then MCS-1 was modified with KOH and H2SO4 to prepare modified biochar MCS-2 and MCS-3, respectively. The adsorption characteristics and mechanism of the three biochars on sulfathiazole (ST) were investigated. The experimental results showed that the biochars all had multi-layered pore structures, MCS-2 and MCS-3 had more developed pore structures and specific surface areas than the unmodified biochar MCS-1. The adsorption of ST by all biochars was consistent with the pseudo-second-order kinetic model and Freundlich model, indicating that the adsorption process was mainly physicochemical and the adsorption rate was mainly controlled by film diffusion. Isothermal adsorption and adsorption thermodynamics indicated that the adsorption of ST by the biochars was spontaneous and multilayer. The maximum adsorption amounts of MCS-1, MCS-2 and MCS-3 on ST were 0.77, 1.12 and 0.47 mg/g at 298 K, respectively. The maximum adsorption of ST by three biochars were reached at pH 2, indicating that the adsorption of ST was suitable under acidic conditions. The adsorption effect of alkali-modified coffee husk biochar (MCS-2) on ST was better than that of unmodified MCS-1 and acid-modified MCS-3 biochar.

Key words: Coffea Arabica L., biochar, adsorption, sulfathiazole

摘要:

针对水体中存在的抗生素污染现象,以小粒咖啡果壳为原料,采用限氧裂解法在500 ℃下制备了生物炭MCS-1,随后分别用KOH和H2SO4改性MCS-1,制得改性生物炭MCS-2和MCS-3,研究了3种生物炭对磺胺噻唑(ST)的吸附特性和吸附机理。实验结果表明:3种生物炭均具有多层级孔隙结构,与未改性生物炭MCS-1相比,MCS-2和MCS-3具有更发达的孔道结构和比表面积。3种生物炭对ST的吸附均符合准二级动力学模型和Freundlich模型,表明吸附过程主要为物理化学作用,且吸附速率主要受薄膜扩散控制。等温吸附和吸附热力学表明3种生物炭对ST的吸附是自发进行的多层吸附。在298 K时,MCS-1、MCS-2、MCS-3对ST的最大吸附量分别为0.77、1.12、0.47 mg/g;pH为2时,3种生物炭对ST的吸附量均达到最大,表明对ST的吸附适合在酸性环境下进行。碱改性后的咖啡果壳生物炭(MCS-2)对ST吸附效果较未改性的MCS-1和酸改性的MCS-3生物炭强。

关键词: 小粒咖啡, 生物炭, 吸附, 磺胺噻唑

CLC Number: