Detailed investigation of the optical and photocatalytic properties of ZnS/NiS nanocomposite for efficient water purification and dye degradation

The degradation of dyes in wastewater via photocatalysis offers a sustainable and effective treatment method, requiring materials with high porosity and suitable band gaps. This study explores manganese (Mn) substitution in zinc ferrite [Mn x Zn 1‐x Fe 2 O 4 ] ( x = 0–1) to tune porosity and band gap. X‐ray diffraction confirmed the crystal structure and Mn incorporation, while TEM showed an average particle size of 54.32 nm. UV–vis diffuse reflectance spectroscopy revealed a red shift in the absorption edge with increasing Mn content, enhancing visible‐light responsiveness. Mn substitution increased porosity and reduced the band gap due to lattice strain and new electronic states, improving optical properties. The Mn 0.8 Zn 0.2 Fe 2 O 4 (MZ4) catalyst demonstrated outstanding performance, achieving 90%, 90%, and 88% degradation of RhB, MB, and ChT dyes, respectively, under visible‐light irradiation within 240 min. These findings highlight the potential of Mn‐substituted zinc ferrite nanoparticles for efficient photocatalytic dye degradation.

Study on preparation methodology of zero-valent iron decorated on graphene oxide for highly efficient sonocatalytic dye degradation

Transition metal oxides (TMO) and their carbon composites have become a glittering upcoming material science candidate. Their interesting properties, such as their meticulous morphology, plentiful availability, flexible surface chemistry along with outstanding mechanical, thermal, and optical properties make them ideal for efficient photocatalytic dye degradation. An extensive range of TMO, and their carbon composites are reviewed highlighting the progression and opportunities for the photocatalytic degradation of dyes. Here, we concisely describe the numerous techniques to extend the optical absorption of these TMOs involving dye sensitization, metal doping, etc. Besides this, an overview of all aspects of dye degradation along with the prevailing challenges for future utilization and development of such nanocomposites towards highly efficient dye degradation system are also reported.

Photocatalytic activity of molybdenum-doped LOS- zeolite for efficient dye degradation and hydrogen production

Environmental adulteration is an emerging concern due to the discharge of wastewater effluents from several sources. Several carcinogenic dyes are the major contaminants in these water bodies. These could cause long-lasting and detrimental effects to humans as well as aquatic ecosystems. For efficient degradation of such dyes, the exploration of nanotechnology has demonstrated huge potential. Herein, the degradation of dyes (MB, CV, and MO) has been carried out photocatalytically using N-doped SnO2 nanoparticles (N:SnO2 NPs) as well as in presence of a sacrificial agent, EDTA. These NPs were synthesized at an ambient temperature. Different characterization techniques were used throughout the analysis of the synthesized NPs. The PXRD analysis reveals formation of single-phase rutile structure with tetragonal symmetry. Using the Scherrer formula, the size of the NPs was found to be less than 5 nm, exhibiting increases in size with N doping. Further, morphological analysis through field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) examined the existence of highly agglomerated, spherical NPs. The thermogravimetric analysis (TGA) results depict the thermal stability of the synthesized NPs up to a temperature of 800 °C. These synthesized N:SnO2 NPs exhibit potent efficiency for the photocatalytic degradation of MB, MO, and CV dyes with an efficiency of 93%, 83%, and 73% degradation, respectively, under UV light irradiation. Additionally, the effect of the sacrificial agent, EDTA, was observed on the degradation process and resulted in a degradation of ~90% MB dye, 88% CV dye, and 86% MO dye within 15 min of UV light irradiation.

Facile synthesis of CuO nanoparticles deposited zeolitic imidazolate frameworks (ZIF-8) for efficient photocatalytic dye degradation

Co-Enzymes based nanoflowers incorporated-magnetic carbon nanotubes: A new generation nanocatalyst for superior removal of cationic and anionic dyes with great repeated use

Liquid chromatography tandem mass spectrometry analysis of photodegradation of a diazo compound: A mechanistic study

Photocatalytic efficiency of CdS can be improved significantly by controlling the morphology and recombining with other semiconductor materials. In this work, a novel snowflake-like CdS/reduced graphene oxide (rGO) composite was prepared by a simple hydrothermal process using graphene oxide and CdS as raw materials and l-aspartic acid as template. The structure of the composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction. Through a basic analysis, a simple synthesis mechanism of snowflake-like CdS is proposed, and transient photocurrent technology demonstrate that the photocurrent of snowflake-like CdS/rGO is greatly improved. Compared with pure CdS, snowflake-like CdS/rGO exhibits efficient organic dye adsorption and degradation under visible light irradiation, resulting from the involving of rGO sheet as chainmail, which facilitates the charge separation, suppresses the recombination of electron–hole pairs, and improves light conversion efficiency of catalysts.

Switchable superlyophobic PAN@Co-MOF membrane for on-demand emulsion separation and efficient soluble dye degradation

Economical, one-pot, and green synthesis of plant-based carbon quantum dots for efficient visible-light photocatalytic dye degradation and water purification

Band gap engineered Sn-doped bismuth ferrite nanoparticles for visible light induced ultrafast methyl blue degradation

Facile green synthesis of nickel-ferrite-rGO (NiFe2O4/rGO) nanocomposites for efficient water purification under direct sunlight

Upcycling agro-waste as a physical template for synthesizing self-doped Fe2O3 and CuO nanoparticles: Assessing textile dye and antibiotics degradation efficiency.

Dye degradation presents a persistent challenge in addressing water pollution. While several methods, including adsorption, biodegradation, and advanced oxidation processes, have been extensively explored, photocatalysis remains one of the most effective techniques. Conventional photocatalytic dye degradation processes often rely on expensive light sources and are time-intensive. Herein, we synthesized a SnS catalyst by the solvated metal atom dispersion (SMAD) method, using Sn foil and sulfur powder. The catalyst exhibited remarkable performance, achieving complete degradation of methylene blue within 2 minutes under ambient room light, without the need for any external light source. Similar degradation efficiency was achieved for methyl orange. To evaluate the role of light for the degradation, control experiments were conducted in the dark using methylene blue as a model dye. Although the degradation rate was slightly reduced, the catalyst still facilitated dye degradation in the absence of light. Additionally, the catalytic performance was tested with four other dyes under natural light, all of which yielded promising results, demonstrating the versatility and effectiveness of the SnS catalyst in dye degradation. This work highlights the potential of the SnS catalyst for efficient and rapid dye degradation under both light and dark conditions, offering an energy-efficient solution for wastewater treatment.