Activation and Zr precursor influence on UiO-66-NH2 composites for efficient cationic and anionic dye removal
Hegazy, Sherif; Ghannami, Ayoub; dos Reis, Glaydson S.; Hu, Tao; Brahmi, Rachid; Tuomikoski, Sari; Lassi, Ulla; Srivastava, Varsha (2024-09-30)
Elsevier
30.09.2024
Sherif Hegazy, Ayoub Ghannami, Glaydson S. dos Reis, Tao Hu, Rachid Brahmi, Sari Tuomikoski, Ulla Lassi, Varsha Srivastava, Activation and Zr precursor influence on UiO-66-NH2 composites for efficient cationic and anionic dye removal, Chemical Engineering Science, Volume 302, Part A, 2025, 120785, ISSN 0009-2509, https://doi.org/10.1016/j.ces.2024.120785
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202410076210
https://urn.fi/URN:NBN:fi:oulu-202410076210
Tiivistelmä
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⋅8H2O precursors, the textural properties were optimized, leading to higher mesopore content and improved crystallinity with the ZrOCl2⋅8H2O 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.
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⋅8H2O precursors, the textural properties were optimized, leading to higher mesopore content and improved crystallinity with the ZrOCl2⋅8H2O 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.
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