α-Fe2O3-based nanocomposites: synthesis, characterization, and photocatalytic response towards wastewater treatment

• Published in: Environmental science and pollution research international 2021-04, Vol.28 (14), p.17697-17711
• Main Authors: Khurram, Rooha, Wang, Zhan, Ehsan, Muhammad Fahad
• Format: Article
• Language: English
• Subjects: Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Configurations; Contamination; Degradation; Dyes; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Fabrication; Ferric oxide; Heterojunctions; Heterostructures; Nanocomposites; Nanomaterials; Nanoparticles; Nanotechnology; Photocatalysis; Recombination; Research Article; Waste Water Technology; Wastewater treatment; Water Management; Water pollution; Water Pollution Control; Zinc oxide
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-020-11778-w

Recently, rising distress over ecological pollution owing to water contamination by coloring effluents primarily due to dyes is of growing concern. The development of semiconductor/magnetic oxide–based nanomaterials has verified to be a potent remediation means for water pollution. In the present article, the fabrication of nanocomposites was carried out by the facile hydrothermal method. The ZnO and ZnSe nanoparticles were in situ formed on the α-Fe 2 O 3 layer, thereby forming a heterojunction. The prepared α-Fe 2 O 3 /ZnSe nanocomposite possessed a degradation of 98.9% for a Congo red aqueous solution of 100 ppm. The α-Fe 2 O 3 /ZnO nanocomposite showed only 26% degradation of 100 ppm dye solution depicting a poor photocatalytic performance. This is attributed to the formation of recombination-enhanced configuration (type-I heterostructure) in the α-Fe 2 O 3 /ZnO nanocomposite (NC). In contrast, α-Fe 2 O 3 /ZnSe NC accomplished a higher and enhanced photocatalytic response. The key rationale for elevated photocatalytic response is the establishment of a recombination-free configuration (type-II heterostructure). Thus, α-Fe 2 O 3 /ZnSe NC known as one of outstanding nanoparticle-nanocomposite photocatalysts was synthesized under mild conditions exclusive of some multifaceted post-treatment, for dye abatement process.