Enhancing methyl orange adsorption capacity via functionalizing ZIF-8 with amphiphilic cetylpyridinium bromide

•A CPB@ZIF-8 nanocomposite was fabricated via the post-synthetic modification strategy.•CPB@ZIF-8 displays a superior adsorption ability for methyl orange (MO) from aqueous solution.•The adsorption behavior of MO follows the pseudo-second-order kinetic model and langmuir isotherm model.•The MO adsor...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Taiwan Institute of Chemical Engineers 2023-05, Vol.146, p.104865, Article 104865
Main Authors: Wang, Zhike, Chen, Zhihang, Ye, Cunling
Format: Article
Language:English
Subjects:
Adsorption
Cetylpyridinium bromide
Methyl orange
ZIF-8
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•A CPB@ZIF-8 nanocomposite was fabricated via the post-synthetic modification strategy.•CPB@ZIF-8 displays a superior adsorption ability for methyl orange (MO) from aqueous solution.•The adsorption behavior of MO follows the pseudo-second-order kinetic model and langmuir isotherm model.•The MO adsorption mechanism of CPB@ZIF-8 was revealed. The precise design or functionalization of metal organic frameworks (MOFs) based on the properties of organic dyes is a promising direction in environment remediation. Herein, using methyl orange (MO) as the target dye, cetylpyridinium bromide (CPB) functionalized ZIF-8 (CPB@ZIF-8) was fabricated by the post-synthetic modification strategy. The surface area and the pore volume of CPB@ZIF-8 are greatly reduced compared with pure ZIF-8. However, the introduction of amphiphilic CPB molecules into ZIF-8 can significantly enhance the adsorption performance of MO. This enhanced MO adsorption capacity can be attributed to the incorporation of more positively charged sites, hydrophobic sites and aromatic rings in the CPB-modified ZIF-8 frameworks, which provides the electrostatic attractions, the hydrophobic and π-π interactions that mainly govern the adsorption of MO on CPB@ZIF-8. The pseudo-second-order kinetic model and the Langmuir isotherm model can well represent the adsorption process of MO. The maximum adsorption capacity (195.54 mg/g) has been obtained at 30 °C, outperforming pristine ZIF-8 and various reported absorbents. The prepared CPB@ZIF-8 composite is a superior example of the tunable adsorption affinity of MOFs for anionic dyes. [Display omitted]
ISSN:1876-1070
1876-1089
DOI:10.1016/j.jtice.2023.104865