Activation and Zr precursor influence on UiO-66-NH2 composites for efficient cationic and anionic dye removal

Abstract

This study investigates the synthesis of UiO-66-NH2@HTC composites, focusing on the control of surface charge, textural properties, and crystallinity. Surface charge modification was achieved through activation processes to enhance affinity for specific pollutants. By utilizing ZrCl4 and ZrOCl2 & sdot;8H(2)O precursors, the textural properties were optimized, leading to higher mesopore content and improved crystallinity with the ZrOCl2 & sdot;8H(2)O precursor. The UiO-66-NH2(ZrCl4)@HTC composite exhibited a crystallinity of 51.7 %, with 40 % mesopores and 57 % micropores, while the UiO-66-NH2(ZrOCl2)@HTC composite showed a crystallinity of 60 %, consisting of 60 % mesopores and 37 % micropores. Adsorption followed the Langmuir isotherm model, with maximum adsorption capacities of 263.1 mg/g for methylene blue (MB) and 277.77 mg/g for Congo red (CR), driven by hydrogen bonding and electrostatic interactions. The activated UiO-66-NH2@HTC composites demonstrated remarkable reusability. These findings emphasize the significant role of surface charge modification, pore structure optimization, and crystallinity enhancement in developing high-performance adsorbents.

Keywords

Activation; Anionic dye; Cationic dye; UiO-66-NH2; Textural properties; Water treatment

Published in

Chemical Engineering Science
2025, volume: 302, number: Part A, article number: 120785
Publisher: PERGAMON-ELSEVIER SCIENCE LTD

SLU Authors

• Simões Dos Reis, Glaydson

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Water Treatment
Materials Chemistry

Publication identifier

• DOI: https://doi.org/10.1016/j.ces.2024.120785

Permanent link to this page (URI)

https://res.slu.se/id/publ/139253