Amine-functionalized Zr-MOF/CNTs nanocomposite as an efficient and reusable photocatalyst for removing organic contaminants

In the current study, a new water-stable nanocomposite and amine-functionalized zirconium-based metal-organic framework/carbon nanotube (UiO-66-NH2@CNT) was synthesized using the hydrothermal approach, displaying superior photodegradation of anionic and cationic dyes under visible-light irradiation. Methyl orange (MO) and Rhodamin B (RhB) were used as organic contaminant models. The prepared materials were fully characterized by FTIR, XRD, SEM, TEM, BET, TGA, UV–Vis absorption, and ICP analysis. The optimal nanocomposite, UiO-66-NH2@CNT(3 wt%) exhibited the highest degradation efficiency of RhB (100%) and MO (93%) in less than 30 min under optimum conditions in comparison with other prepared materials (F-CNT, UiO-66, Ui-66-NH2, and other UiO-66-NH2@CNT-X samples). Different effective parameters such as initial dye concentration, catalyst dosage, and solution pH have been also studied. The possible mechanism for photodegradation of dyes over UiO-66-NH2@CNT(3 wt%) showed that the increase in the photocatalytic activity can be attributed to the range of improved visible-light absorption (lower band gap), and the great specific surface area based on composite and water stability as well as the formation of an effective hetero-junction. Trapping studies also revealed that hydroxyl radicals (OH•) and photo-generated holes (h+) had the most influence on the photocatalytic degradation of both dyes. The kinetic study for the dye degradation process was fitted with a first-order kinetic model. Also, after six-reuse cycles, the optimum composite still showed high photodegradation ability (>90%). © 2021 Elsevier B.V.

Abdi J.1 , Banisharif F.2 , Khataee A. 3, 4
Elsevier B.V.
  • 1 Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, 3619995161, Iran
  • 2 School of Chemical, Oil and Gas Engineering, Iran University of Science and Technology, Narmak, Tehran, 16846-13114, Iran
  • 3 Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, 51666-16471, Iran
  • 4 Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, Moscow, 117198, Russian Federation
Hydrothermal; Metal-organic framework; Organic pollutant; Photocatalytic degradation; UiO-66-NH2@CNT nanocomposite
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