工业水处理 ›› 2025, Vol. 45 ›› Issue (1): 104-114. doi: 10.19965/j.cnki.iwt.2023-1266

• 试验研究 • 上一篇    下一篇

季铵盐改性二氧化硅的制备及其吸附钒(Ⅴ)的性能

张翠红1(), 王靖2, 王洁3, 袁文蛟3()   

  1. 1. 山东建研检测检验科技有限公司,山东 济南 250000
    2. 中铁市政环境建设有限公司,上海 200331
    3. 天津理工大学环境科学与安全工程学院,天津 300384
  • 收稿日期:2024-11-19 出版日期:2025-01-20 发布日期:2025-01-22
  • 作者简介:

    张翠红(1980— ),硕士,高级工程师。E-mail:

    袁文蛟,博士,高级工程师。E-mail:

  • 基金资助:
    天津市科技支撑重点项目(22YFZCSN00020); 天津市技术创新引导专项(23YDTPJC00410)

Preparation of quaternary ammonium-modified silica and its adsorption of vanadium(V)

Cuihong ZHANG1(), Jing WANG2, Jie WANG3, Wenjiao YUAN3()   

  1. 1. Shandong Jianyan Testing and Inspection Technology Co. , Ltd. , Ji’nan 250000, China
    2. Municipal Environmental Construction Co. , Ltd. of CREC, Shanghai 200331, China
    3. School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
  • Received:2024-11-19 Online:2025-01-20 Published:2025-01-22

摘要:

钒(Ⅴ)是一种重要的战略金属资源,在合金制造、化工和新能源等领域被广泛应用,逐渐成为废水中的新兴污染物之一。合成了一种季铵盐改性二氧化硅(SiO2@DMOA)材料用于吸附水溶液中的钒(Ⅴ)。热重分析、FT-IR、SEM以及EDS结果证明了SiO2@DMOA复合材料的成功合成。在20 mL 2 mmol/L钒(Ⅴ)溶液中加入50 mg SiO2@DMOA,调节溶液pH为3.3,在接触时间为15 min和温度为298 K条件下,SiO2@DMOA对钒(Ⅴ)的吸附容量为38.97 mg/g。准二级反应动力学和Langmuir吸附等温模型结果表明SiO2@DMOA吸附钒(Ⅴ)的过程为表面单层的化学吸附,颗粒内扩散模型和Boyd模型证明了液膜扩散是该吸附过程的主要限速步骤。热力学结果显示SiO2@DMOA吸附钒(Ⅴ)的ΔH 0>0、ΔS 0>0、ΔG 0<0,表明吸附过程是可行的和自发的。在离子强度(NaCl)<0.1 mol/L时,共存离子对SiO2@DMOA吸附钒(Ⅴ)效果的影响几乎可以忽略。此外,在pH为3~5时,钒(Ⅴ)与铬(Ⅵ)两者的最大分离系数(β V/Cr)为135.42。经过5个循环的吸附-解吸实验,SiO2@DMOA的吸附效能无明显衰减。

关键词: 吸附, 季铵盐, 改性二氧化硅, 钒(Ⅴ)

Abstract:

Vanadium(Ⅴ) is an emerging contaminant reported in wastewater along with the increasing of alloy manufacturing, chemicals, new energy fields as a significant national strategy resource. In this study, a quaternary ammonium modified silica(SiO2@DMOA) material was synthesized for the adsorption of vanadium(Ⅴ) in aqueous solution. The results of TGA, FT-IR, SEM, and EDS confirmed the successful synthesis of SiO2@DMOA composite. Under the conditions of solution volume of 20 mL, vanadium(Ⅴ) concentration of 2 mmol/L, solution pH of 3.3, contact time of 15 minutes, and temperature of 298 K, the adsorption capacity for vanadium(Ⅴ) by SiO2@DMOA was 38.97 mg/g. The pseudo-second-order reaction kinetics and Langmuir adsorption isotherm model indicated that the process of adsorbing vanadium(Ⅴ) by SiO2@DMOA was a surface monolayer chemical adsorption process, and the intra-particle diffusion model and Boyd model demonstrated that liquid film diffusion was the main limiting rate of this adsorption process. Thermodynamic studies demonstrated the feasibility and spontaneity of vanadium(Ⅴ) adsorption by SiO2@DMOA, with ΔH 0>0, ΔS 0>0 and ΔG 0<0. The influence of ionic strength (NaCl) on adsorption was found to be negligible at concentrations of less than 0.1 mol/L. Furthermore, within pH range of 3-5, the maximum separation factor(β V/Cr) between vanadium(Ⅴ) and chromium(Ⅵ) was 135.42. The adsorption efficiency of SiO2@DMOA did not show any significant attenuation after five cycles of adsorption-desorption experiments.

Key words: adsorption, quaternary ammonium salts, modified silica, vanadium(Ⅴ)

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