Efficient photocatalytic degradation of organic pollutants over TiO2 nanoparticles modified with nitrogen and MoS2 under visible light irradiation

Abstract

Investigate the use of visible light to improve photocatalytic degradation of organic pollutants in wastewater. Nitrogen-doped titania and molybdenum sulfide nanocomposites (NTM NCs) with different weight ratios of MoS2 (1, 2, and 3 wt.%) synthesized by a solid state method applied to the photodegradation of methylene blue(MB) under visible light irradiation. The synthesized NTM composites were characterized by SEM, TEM, XRD, FT-IR, UV–Vis, DRS and PL spectroscopy. The results showed enhanced activity of NTM hybrid nanocrystals in oxidizing MB in water under visible light irradiation compared to pure TiO2. The photocatalytic performance of NTM samples increased with MoS2 content. The results show that the photodegradation efficiency of the TiO2 compound improved from 13 to 82% in the presence of N-TiO2 and to 99% in the presence of MoS2 containing N-TiO2, which is 7.61 times higher than that of TiO2. Optical characterization results show enhanced nanocomposite absorption in the visible region with long lifetimes between e/h+ at optimal N-TiO2/MoS2 (NTM2) ratio. Reusable experiments indicated that the prepared NTM NCs photocatalysts were stable during MB photodegradation and had practical applications for environmental remediation.

Emerald eco-synthesis: harnessing oleander for green silver nanoparticle production and advancing photocatalytic MB degradation with TiO2&CuO nanocomposite

“…It is proposed that the combination of n-type and p-type semiconductors produces an internal electric field, resulting in the production of a p-n hetero junction. The creation of this p-n hetero junction, as well as the band alignment between CuO and TiO 2 , considerably facilitates electron–hole separation and increases catalytic activity 38 – 40 . Next, the best performing photocatalyst, TC 1 was modified with Ag nanoparticles as shown in Fig.…”

Green route to fabrication of Semal-ZnO nanoparticles for efficient solar-driven catalysis of noxious dyes in diverse aquatic environments

“…Industrial processes involving the manufacture of cosmetics, textiles, leather, paper, plastic, and dyes often result in the discharge of wastewater contaminated with complex and vividly colored dyes, which ultimately leads to contamination of water resources and reservoirs ( Nagajyothi et al, 2020 ; Alamier et al, 2023 ; Khader et al, 2023 ; Peng et al, 2023 ). These dye molecules are aromatic, chemically stable, toxic, potentially mutagenic, and carcinogenic, in addition to being typically persistent and resistant to natural degradation processes ( Suhaimi et al, 2022 ; Aslam et al, 2023 ; El Sharkawy et al, 2023 ; Geldasa et al, 2023 ; Vievard et al, 2023 ). Their presence in water bodies has substantial detrimental effects on aquatic life and the overall ecosystem, posing significant environmental challenges and threats to human life if left untreated ( Alfei et al, 2023 ; Warren-Vega et al, 2023 ).…”

“…Traditional treatment methods involving coagulation, adsorption, and osmotic pressure have been used to remove dyes from rivers and other water bodies; however, each method has its limitations in efficiently eliminating dyes from wastewater, necessitating advanced and efficient degradation techniques ( Ekennia et al, 2021 ; Zewde and Geremew, 2022 ). Innovative catalytic photodegradation has emerged as a promising solution to address the challenges posed by wastewater contaminated with organic dyes ( Mutukwa et al, 2022 ; El Sharkawy et al, 2023 ). Catalytic photodegradation is easy to achieve, is affordable, and has a straightforward instrumental procedure as well as non-selective oxidation.…”

Ultrasonic-Assisted Electrodeposition of Mn-Doped NiCo2O4 for Enhanced Photodegradation of Methyl Red, Hydrogen Production, and Supercapacitor Applications

“…Semiconductor photocatalysts have been widely studied and used in the treatment of environmental pollution owing to their ability to produce hydrogen and oxygen from water. Titanium dioxide (TiO 2 ) is among the most used semiconductor photocatalysts due to its high efficiency of 13% [1,2]. However, titanium dioxide has a large 3.2 eV band gap energy, reducing its efficiency under visible light.…”