Heterogeneous catalytic oxidation of chromotrope 2B with H 2 O 2 and metal complexes supported on aluminum oxide hydroxide as catalyst

• Published in: International journal of chemical kinetics Vol. 55; no. 1; pp. 25 - 38
• Main Authors: El‐Ghobashy, Marwa A., Salem, Ibrahim A., Abdel‐Rahman, Sahar R., Salem, Mohamed A.
• Format: Journal Article
• Language: English
• Published: 01-01-2023
• ISSN: 0538-8066; 1097-4601
• DOI: 10.1002/kin.21612

The heterogeneous catalytic oxidation of Chromotrope 2B (C2B) dye with H
2
O
2
and the aluminum oxide hydroxide (AlOOH) modified with ammonia complexes of Cu
II
, Co
II
, Ni
II
, and Cr
III
(AlOOH/[M
n+
(amm)
m
]) as catalysts were studied. The AlOOH/[Cu
II
(amm)
4
] is the most efficient catalyst and therefore it was chosen as the potential catalyst for the oxidative degradation of C2B in an aqueous solution. The AlOOH/[Cu
II
(amm)
4
] was characterized by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray (EDX), and transmission electron microscopy (TEM), techniques. The rate of reaction was dependent on the type of the metal complex supported on the AlOOH, initial concentration of the dye and H
2
O
2
, catalyst dose, pH, the concentration of NaCl, and temperature. The catalytic activity of the AlOOH/[M
n+
(amm)
m
] according to the kind of metal ion decreased in the order: Cu
II
 > Co
II
 > Cr
III
 > Ni
II
. Other catalysts consisting of the AlOOH supported with Cu
II
complexed with ethylenediamine, ethanolamine, 1,3 propanediamine, and 1,4 butanediamine, (AlOOH/[Cu
II
(amine)
m
]), were also investigated. The activity of the (AlOOH/[Cu
II
(amine)
m
]) as catalyst according to the type of ligand followed the order: 1,4 butanediamine > 1,3 propanediamine > ethanolamine > ethylenediamine > ammonia. The reaction rate increased with increasing the catalyst dose, concentration of H
2
O
2,
C2B, and NaCl, pH, and temperature. Since the reusability results for the AlOOH/[Cu
II
(amm)
4
] revealed good stability over seven cycles, it can thus be considered a promising and cost‐effective catalyst for the removal of harmful dyes from wastewater.