Industrial Water Treatment ›› 2024, Vol. 44 ›› Issue (10): 193-200. doi: 10.19965/j.cnki.iwt.2023-0974

• RESEARCH AND EXPERIMENT • Previous Articles     Next Articles

Preparation of Ti-modified biochar and its adsorption for Pb(Ⅱ) and Co(Ⅱ)

Qianqian DUAN(), Jingyi CHEN, Junsheng LIU(), Junfei ZHANG, Shitao LIN, Yu LIU   

  1. School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
  • Received:2024-07-20 Online:2024-10-20 Published:2024-10-23

Ti基改性生物炭的制备及其吸附Pb(Ⅱ)和Co(Ⅱ)的性能研究

端倩倩(), 陈静怡, 刘俊生(), 张俊飞, 林世涛, 刘裕   

  1. 合肥大学能源材料与化工学院,安徽 合肥 230601
  • 作者简介:

    端倩倩(1998— ),硕士研究生。E-mail:

    刘俊生,博士,教授,硕士生导师。E-mail:

Abstract:

Tetra-n-butyl titanate was used to modify black peanut shells(PSs) to prepare Ti-based modified PSs biochar(Ti@PB). Its adsorption characteristics for Pb(Ⅱ) and Co(Ⅱ) in mixed solution were investigated. The characterization results of Ti@PB showed that Ti mass fraction reached 33.822%, indicating that Ti was successfully loaded on the surface of the biochar. In addition, the surface of Ti@PB was rough, with many irregular pore structures, which was an adsorbent material with mixture of micropores and mesopores, and the surface functional groups were mainly dominated by oxygen-containing functional groups. The removal of Pb(Ⅱ) and Co(Ⅱ) by Ti@PB was enhanced compared to the biochar prepared from unmodified PSs. The kinetic study demonstrated that the removal of Pb(Ⅱ) by Ti@PB followed the quasi-second-order kinetic equation and was dominated by chemisorption, while the removal of Co(Ⅱ) was more consistent with the quasi-first-order kinetic equation and was predominantly physisorbed. The isothermal adsorption fitting results showed that the adsorption of both Pb(Ⅱ) and Co(Ⅱ) by Ti@PB conformed to the Freundlich model as multilayer non-homogeneous phase adsorption.

Key words: black peanut shells, modification by tetrabutyl titanate, biochar, mixed ion solution

摘要:

采用钛酸四丁酯对黑花生壳(PSs)进行改性处理,制备Ti基改性PSs生物炭(Ti@PB),并探讨其对混合溶液中Pb(Ⅱ)和Co(Ⅱ)的吸附特性。Ti@PB表征结果显示,其Ti质量分数达33.822%,说明Ti成功负载在生物炭表面。此外,Ti@PB表面粗糙,存在大量不规则的孔隙结构,为微孔和介孔混合的吸附材料,且表面官能团主要以含氧官能团为主。对照未经改性PSs制备的生物炭,Ti@PB对Pb(Ⅱ)和Co(Ⅱ)的去除能力增强。动力学研究表明,Ti@PB对Pb(Ⅱ)的去除遵循准二阶反应动力学方程,以化学吸附为主;对Co(Ⅱ)的去除更符合准一阶反应动力学方程,以物理吸附为主。等温吸附线拟合结果表明,Ti@PB对Pb(Ⅱ)和Co(Ⅱ)的吸附均符合Freundlich模型,为多层非均相吸附。

关键词: 黑花生壳, 钛酸四丁酯改性, 生物炭, 混合离子溶液

CLC Number: