Biosynthesized TiO₂ nanoparticles an efficient biogenic material for photocatalytic and antibacterial applications

A simple one-step biosynthesis route has been adopted for the synthesis of high crystalline phase pure anatase TiO2 nanoparticles. The structural conformation and functional group analysis of the synthesized nanoparticles were made through X-Ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The optical property and the band gap were estimated by using UV-Visible diffuse reflectance spectroscopy (UV-DRS). The surface morphological properties of the anatase TiO2 nanoparticles were confirmed using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) and the size of the synthesized nanoparticles are 8 nm. The element analysis was evaluated by using EDS and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the prepared sample was investigated by the decolourization of Methylene blue dye under UV and solar light irradiation. The maximum dye removal efficiency of 99.2% was observed for solar light irradiation. Besides, the prepared samples also exhibit excellent antibacterial activity against Klebsilla Pneumoniae and Streptococcus Pneumoniae. The antibacterial activity for the synthesized TiO2 nanoparticles show maximum zone of inhibition (23.5 mm). Thus, the biogenic property of the bioprocessed TiO2 nanoparticles is a potential material for environmental and biomedical applications. [Formula: see text] </jats:p

Ni-Doped SnO2 Nanoparticles for Sensing and Photocatalysis

Ni-doped SnO2 nanoparticles were synthesized by a coprecipitation route and showed superior properties for a series of different applications. The 1 atom % Ni-doped SnO2 NPs exhibited excellent electrochemical performance as supercapacitors to deliver a specific capacitance of 793 F g–1 at an applied current density of 2.5 A g–1 in a KOH electrolyte while retaining its capacitance over 1250 cycles. The energy-dependent (100, 150, and 200 μJ) nonlinear absorption behavior of the Ni-doped SnO2 NPs was investigated and found to be due to the effective two-photon absorption with free carrier absorption. A clad-modified fiber-optic gas-sensor setup was used to sense the ammonia at ambient temperature. Further, the photocatalytic degradation of Rhodamine B, Congo red, and Direct red dyes by the Ni-doped SnO2 NPs was examined under visible-light irradiation

Emerging Contaminants: Remediation Technologies/ ed. by Jeyaseelan Aravind, Murugesan Kamaraj.

In English.The increased demand due to anthropogenic activity leads to emerging contaminants, resulting in a substantial environmental hazard. The long-term presence and exposure of contaminants lead to severe negative impacts on the environment, humans, and other life forms. Hence, emerging contaminants in the environment is a worldwide concern, and new technologies to mitigate these contaminants are being developed. This book covers the source, occurrence, toxicity, and detection techniques of a wide range of emerging contaminants. This collection also discusses the scope and applications of diverse techniques, including Bio/Phyto and Nano-remediation technologies, to mitigate the emerging contaminants; along with their sustainability issue and prospects. As a result, this book appears to provide insight into several modern and environmentally friendly waste management options, the possibility to minimize and lessen the effects of contaminants, and striving to lower toxicological endpoints to assure environmental safety. This book delivers the most recent advancements by prominent specialists in environmental sciences to academics, researchers, students, and practitioners interested in the identification and eradication of emerging pollutants from the environment.Frontmatter -- Contents -- List of contributing authors -- 1 Occurrence, fate, and toxicity of emerging contaminants in a diverse ecosystem -- 2 Techniques for the detection and quantification of emerging contaminants -- 3 Advances in biopolymer composites and biomaterials for the removal of emerging contaminants -- 4 Development in nanomembrane-based filtration of emerging contaminants -- 5 Metal nanoparticles and its application on phenolic and heavy metal pollutants -- 6 Nanobiocatalysts and photocatalyst in dye degradation -- 7 Trends in microbial degradation and bioremediation of emerging contaminants -- 8 Recent endeavors in microbial remediation of micro- and nanoplastics -- 9 Phytoremediation as an effective tool to handle emerging contaminants -- 10 Recent advances and prospects for industrial waste management and product recovery for environmental appliances: a review -- Index1 online resource (XIII, 238 pages