Photocatalytic degradation of organic dyes using composite nanofibers under UV irradiation

Abstract

In this work, photocatalytic degradation of organic dyes such as methylene blue (MB) and indigo carmine (IC) have been studied by composite nanofibers systems containing cellulose acetate (CA), multiwall carbon nanotubes (CNT) and TiO 2 nanoparticles under UV light. The amino factionalized TiO 2 -NH 2 NPs cross-linked to the CA/CNT composite nanofibers works as a semiconductor catalyst. The morphology and crystallinity were characterized by scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction, and Fourier transform infrared spectroscopy. It was also seen that many factors affected the photodegradation rate, mainly the pH of the solution and the dye concentration, temperature, etc. The study demonstrated that IC degrades at a higher rate than MB. The maximum photodegradation rate of both organic dyes was achieved at a pH 2. In comparison to other studies, this work achieved high photodegradation rate in lower time and using less power intensity.

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

“…Beyond a certain concentration, in our case 10 ppm, the catalytic surface gets saturated and hence further increase in concentration of food colorant resulted in lesser degradation rate. [126] The excess of the molecules also have tendency to absorb a part of visible light thus reducing the number of photons that can reach to the catalytic surface. [124] In other words, we can say that due to increase in concentration of food colorant, the path length for travelling of photons through the solution decreases, as dictated by the Beer's Lambert Law, [127] thus inhibiting the photocatalysis and consequently the degradation also.…”

Photodecontamination of Vat Green 1 and Dianix Blue dyes by MWCNTs/x%TiO2 nanocomposites synthesized using evaporation method

“…The photocatalytic degradation rates of the two dyes Vat Green 1 and Dianix Blue using Sunlight, UV and Xenon irradiation was monitoring spectrophotometrically in UV-Vis range as shown in Figure -6, according to equation (6).…”

“…A novel one-dimensional (1D) carbon nanotubes (CNTs) have a specific character, unique mechanical properties and promising potential applications [1][2][3][4][5][6][7]. The uniformity in diameter, the dearth of purity, chirality and alignment has hindered searching of the intrinsic properties such as electronic, mechanical, sorption properties of CNTs in addition to their applications in novel electronic systems [8][9][10][11][12].…”

Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution

“…Generally, dyes and their byproducts are considered to be toxic or mutagenic agents [3]. Different strategies are utilized to remove dyes from contaminated waters, such as biological methods [4], coagulation and flocculation [5], photocatalysis [6], and adsorption using natural or synthetic materials [7,8].…”