化工进展 ›› 2022, Vol. 41 ›› Issue (7): 3915-3924.DOI: 10.16085/j.issn.1000-6613.2021-1827

• 资源与环境化工 • 上一篇    下一篇

2-吡啶甲醛功能化SBA-15介孔材料的制备及其对Cr(Ⅲ)离子的吸附

姜晓庆(), 郭宇(), 吴红梅   

  1. 辽宁工业大学化学与环境工程学院,交叉科学研究院,辽宁 锦州 121001
  • 收稿日期:2021-08-25 修回日期:2021-11-09 出版日期:2022-07-25 发布日期:2022-07-23
  • 通讯作者: 郭宇
  • 作者简介:姜晓庆(1995—),女,硕士研究生,研究方向为化工新材料。E-mail:2502726134@qq.com
  • 基金资助:
    国家自然科学基金(21601075);辽宁省“兴辽英才计划”项目(XLYC2007171);辽宁省“百千万人才工程”项目(辽人社函〔2020〕78号)

Synthesis of 2-pyridinecarboxaldehyde functionalized SBA-15 mesoporous material for the adsorption of Cr(Ⅲ) ions from aqueous solution

JIANG Xiaoqing(), GUO Yu(), WU Hongmei   

  1. Institute of Interdisciplinary Research, School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
  • Received:2021-08-25 Revised:2021-11-09 Online:2022-07-25 Published:2022-07-23
  • Contact: GUO Yu

摘要:

通过席夫碱反应将2-吡啶甲醛成功嫁接到氨基化的SBA-15介孔分子筛上,本文获得了一种新型功能化SBA-15吸附剂(N-SBA-15)。采用傅里叶变换红外光谱、X射线衍射、元素分析、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、热重分析和氮气吸附-脱附等手段对N-SBA-15的表面官能团、形貌、孔道结构和表面化学性质进行了详细的表征分析。利用N-SBA-15对水溶液中的Cr(Ⅲ)进行了吸附实验,其最大吸附容量为84.3mg/g。动力学分析和等温吸附研究结果表明,N-SBA-15对Cr(Ⅲ)的吸附过程符合准二级动力学模型和Langmuir模型。吸附热力学分析表明,该吸附过程是自发的吸热过程(?G<0、?S>0、?H>0)。吸附机理分析表明该吸附过程主要是由N-SBA-15表面有机官能团与Cr(Ⅲ)的配位作用实现的。而且,N-SBA-15吸附剂经过5次吸附-脱附测试,仍然对Cr(Ⅲ)具有较高的吸附容量。

关键词: SBA-15, 2-吡啶甲醛, 席夫碱, 吸附, Cr (Ⅲ)

Abstract:

A novel functionalized SBA-15 material (N-SBA-15) was synthesized via Schiff's base reaction of 2-pyridinecarboxaldehyde with amino modified SBA-15 mesoporous material for adsorption of Cr(Ⅲ) ions from aqueous solution. The organic functional groups, morphology, pore structure and chemical property of N-SBA-15 were determined by FTIR, XRD, EDX, SEM, TEM, XPS, TGA and N2 adsorption-desorption. Moreover, the adsorption performance of N-SBA-15 adsorbent on Cr(Ⅲ) ions in aqueous solution was investigated. The adsorption capacity of 84.3mg/g toward Cr(Ⅲ) ions was obtained. The kinetics analysis and adsorption isotherms revealed that the adsorption process of Cr(Ⅲ) ions by N-SBA-15 was consistent with pseudo-second-order kinetic model and Langmuir isotherm model. The thermodynamic parameters showed that Cr(Ⅲ) adsorption onto N-SBA-15 was spontaneous, endothermic and entropy-increasing process (?G<0, ?S>0, ?H>0). The adsorption mechanism analysis indicated that Cr(Ⅲ) adsorption onto N-SBA-15 was mainly based on the chemical combination of N atoms on the organic functional groups of N-SBA-15 through coordination bond. Furthermore, N-SBA-15 still kept high adsorption capacity after five adsorption–desorption cycles.

Key words: SBA-15, 2-pyridinecarboxaldehyde, Schiff's base, adsorption, Cr(Ⅲ)

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