Preparation and Characterization of PANI@NiO Visible Light Photocatalyst for Wastewater Treatment

Abstract

Environmental problems caused by the influence of organic dyes have devoted researchers to build the system for the degradation of dyes. Photocatalysis has gained a remarkable interest to degrade organic dyes for wastewater treatments. In this work Polyaniline@NiO with different wt.% the composition was synthesized with rich catalytic sites by in‐situ polymerization to degrade the organic dye Rhodamine‐B from water. The synthesized materials were characterized by XRD, RAMAN spectroscopy, SEM, UV/Vis spectroscopy and Photocatalytic degradation. Polyaniline (PANI) showed a high absorption coefficient in visible light and NiO absorbs light in the ultraviolet range. The charge mobility was enhanced by making a composite of PANI and NiO. The photocatalytic performance of PANI in visible light was improved by making its composite with NiO, which provides the easing path to flow photoelectron from LUMO of PANI to the surface of the water and further dye degradation mechanism was performed

Photocatalytic Degradation of Organic Dyes with Magnetically Separable PANI/Fe3O4 Composite under Both UV and Visible‐light Irradiation

“…[48] Besides, the reduced bandgap of PANI/Fe 3 O 4 compared to PANI and Fe 3 O 4 results in extending absorption spectrum and enhanced electron transfer from PANI to Fe 3 O 4 before recombination. [21,49] It is important to bear in mind that the photocatalytic activity of PANI/Fe 3 O 4 composite was found in a similar trend for photocatalytic degradation of JK and LR dyes under both UV and visible-light irradiation as shown in Figure 6 c-f. Those results ensure as-prepared PANI/Fe 3 O 4 composite can be widely applied in photocatalytic degradation of various dyes.…”

“…[16] Polyaniline (PANI) as a p-type semiconductor has been applied as a possible photocatalyst thanks to its high hole transportability, large absorption coefficient in the visible-light region, outstanding redox properties, easy protonation reversibility, fast charge carrier separation, and low-cost production process. [17] Thus, successful utilization of PANI as a visible-lightdriven photocatalyst has been reported for the degradation of organic dyes including MG, [18] Congo red (CR) [19] methylene blue (MB), [20] rhodamine (RhB), [21] and others [16,[21][22] However, the difficulties in separation of PANI-based photocatalysts from solutions as well as the rapid charge recombination and hole weedy photocatalytic process are the main challenges for the practical applications. [16,23] To overcome those issues, it is necessary to design more efficient both UV and visible-lightdriven composite materials that could be simply separated from aqueous solution have been required.…”

Review of the Advancements on Polymer/Metal Oxide Hybrid Nanocomposite‐Based Adsorption Assisted Photocatalytic Materials for Dye Removal

“…The photocatalytic degradation reaction of methylene blue and methyl orange by polyaniline-ZnO (PANI-ZnO), [38] PANI-NiO, [40] and Poly (aniline-co-p-phenylenediamine)/ZnO, [66] methyl orange by PANI/TiO 2 /SiO 2 , [39] rhodamine B by PANI-NiO, [67] reactive red azo dye (RR 45) and methyl orange by PANI/ TiO 2 , [42,68] congo red by PANI/ZnO, [69] methylene blue by Poly (3, 4-ethylene dioxythiophene)/zinc oxide, [70] methyl orange by polythiophene/ZnO, [71] p-cresol by TiO 2 /ZnO/PANI, [72] methylene blue by PANI/Fe 3 O 4 /SiO 2 /TiO 2 , [73] and by polypyrrole/TiO 2 , [74] and methyl orange by poly (3-hexylthiophene)/TiO 2 , [75] are enhanced by polymer sensitization. The excited electron in the LUMO of the polymer is continuously donated to the conduction band of metal oxide, and metal oxides' valance bands attract the positively charged hole.…”

Aluminum Doping Effects on Interface Depletion Width of Low Temperature Processed ZnO Electron Transport Layer-Based Perovskite Solar Cells

“…Green energy production is the cardinal matter in the context of natural resources preservation which opens up the avenues for synthesis of ubiquitous potential materials for energy harvesting applications ( Balaprakash et al, 2018 ). Nanotechnology is arguably the technology of century ( Roco, 2011 ): Few notable properties that might change or behave differently for nanomaterials than bulk materials are optical ( Djurisic and Leung, 2006 ), electrical, magnetic ( Slonczewski, 1961 ; Adnan et al, 2021 ; Rabbani et al, 2021 ), mechanical strength, charge storage capacity, biological activities ( Usman et al, 2020 ), fluorescence, magnetic permeability, chemical reactivity ( Tao, 2008 ), and melting points.…”