Degradation of Malachite green using heterogeneous nanophotocatalysts (NiO/TiO2, CuO/TiO2) under solar and microwave irradiation

Abstract

Heterogeneous photocatalysis is an advanced oxidation process (AOP). This technique is used to degrade a wide range of pollutants in water. In this study, photocatalytic oxidation and mineralization of malachite green in an aqueous suspension containing nickel-based catalysts and copper supported on TiO2 prepared by wet diffusional impregnation was studied using two sources of irradiation: solar and microwave. Photodegradation kinetics were studied according to several parameters, such as catalyst type, dye concentration, photocatalyst mass and microwave power. The results showed that the photodegradation of malachite green is faster in the presence of CuO/TiO2 catalyst than NiO/TiO2 catalyst than TiO2. Dye degradation by microwave irradiation is faster than that by solar irradiation.

Significant photocatalytic decomposition of malachite green dye in aqueous solutions utilizing facilely synthesized barium titanate nanoparticles

“…The percentages of photocatalytic activity of the EA600 and EA800 samples towards malachite green dye were compared with those of other photocatalysts such as CuO/TiO 2 , NiO/TiO 2 , CuCo 2 O 4 , chitosan/Ce/ZnO, EDTA/ZnO, Fe(III)-cross-linked alginate–carboxymethyl cellulose, cobalt oxide/citric acid, Dy 2 O 3 /SiO 2 , and lanthanide cerate, as given in Table 1 [ 64 – 71 ]. Consequently, we can assume that the EA600 and EA800 photocatalysts were highly efficient for the decomposition of the malachite green dye.…”

Synthesis, Characterization, and Antimicrobial and Antiproliferative Effects of CuO-TiO2-Chitosan-Escin Nanocomposites on Human Leukemic MOLT4 Cells

“…The COO- group of the carboxylic acid salt could be accountable for the peak at 1385 cm −1 [ 36 ]. As can be seen in the graph below, escin produced distinct peaks caused by its C-H group: asymmetrical peaks at 2924 cm −1 and symmetrical peaks at 2854 cm −1 , respectively; a stretching peak at 1113 cm −1 ; and an out-of-plane bending peak at 955 cm −1 [ 37 , 38 ]. The stretching vibration of the Cu-O and Ti-O bonds also appeared at nearly 710, 594, and 532 cm −1 [ 39 ].…”

Polypyrrole and a polypyrrole/nickel oxide composite – single-walled carbon nanotube enhanced photocatalytic activity under visible light

“…26 Djebbari et al showed faster solar photodegradation of organic dyes using the NiO/TiO 2 system compared to a single-component system. 27 In this perspective, developing composites of conducting polymers with inorganic materials is one of the important strategies for enhancing the visible-light-driven photodegradation rates of organic dyes. 6,7,28,29 In the photocatalytic process, conducting polymers reduce the recombination of photogenerated electrons and holes, which plays a vital role in dye degradation.…”

“…26 Djebbari et al showed faster solar photodegradation of organic dyes using the NiO/TiO 2 system compared to a single-component system. 27…”