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Emerging Biotechnologies for Treatment of Antibiotic Residues from Pharmaceutical Waste Waters for Sustainable Environment A Case Study under Visible Light with NFC-doped Titania
Published in Gunjan Mukherjee, Sunny Dhiman, Waste Management, 2023
Reyhan Ata, Gökçe Merdan, Gunay Yildiz Tore
Anatase form of TiO2: It has stronger oxidizing feature due to more positive valence band gap than other semiconductors,It has excellent photocatalytic property and photochemical stability,Have high and unique electronic and optical features,It has high resistance against chemical substances,It has no toxic feature,Low cost
2 Crystallization Kinetics Using In Situ Sealed Capillary High-Temperature Synchrotron Radiation Diffraction
Published in It-Meng Low, Hani Manssor Albetran, Victor Manuel de la Prida Pidal, Fong Kwong Yam, Nanostructured Titanium Dioxide in Photocatalysis, 2021
It-Meng Low, Hani Manssor Albetran, Victor Manuel de la Prida Pidal, Fong Kwong Yam
Titanium dioxide ( TiO2 ) is a commercially important semiconductor oxide material with two common crystalline phases, namely, anatase and rutile [1]. Anatase is used in photocatalytic applications such as photocatalysts, solar energy cells, antibacterial applications, gas sensors, and catalyst support [2]. Rutile has a high refractive index and is often used in optical devices and as a pigment [3].
Application of Green Technology in Water and Wastewater Treatments
Published in Shrikaant Kulkarni, Ann Rose Abraham, A. K. Haghi, Renewable Materials and Green Technology Products, 2021
Remya Vijayan, Sijo Francis, Beena Mathew
Photocatalytic oxidation is one of the most efficient and promising AOPs in which the organic compounds are fragmented into the water, carbon dioxide, and mineral salts. The activated species (hydroxyl radicals and superoxide radicals) are used for the complete mineralization.50 The photocatalytic degradation by using semiconductors ( TiO2, ZnO, Fe2O3, WO3 , and CdS) is widely used for the degradation of organic pollutants. The nano-titanium dioxide ( TiO2 , anatase form) is a commonly used photocatalyst due to its availability, chemical stability, extraordinary photocatalytic activity, nontoxicity, low cost, resistance to photocorrossion, optical and electrical properties, etc.51,52 It is possible to use sunlight in the case of TiO2 since it absorbs wavelength below 400 nm.
Liquid impregnation and sol-gel routes synthesis of tailored titania NPs for the effective water remediation processes
Published in Inorganic and Nano-Metal Chemistry, 2023
Najm Us Saqib, Irfan Shah, Rohana Adnan, Bakht Tarin Khan, Israr Alam, Muhammad Zahir Shah
The anatase phase of TiO2 is an indirect bandgap semiconductor with a bandgap energy of 3.20 eV.[29] The plot of indirect transitions is calculated by plotting F(R)1/2 versus E (eV), given in Table 1. As depicted in Figure 1, the redshift for Fe doped TiO2 prepared by both methods was observed. This redshift might be due to the overlapping of Fe3+ 3d-orbital and the conduction band of TiO2.[27] Similarly, the color changes from white to yellow upon Fe doping also support the redshift as described elsewhere.[5,27] A substantial reduction in the bandgap energy and absorption in the visible region was observed for SG prepared doped sample (2.54 eV) as compared to the pure TiO2 (3.12 eV). Similar trends were observed for the LI prepared Fe doped (2.98 eV) and pure TiO2 (3.18 eV) NPs, however, the intensity of reduction was comparatively less to that of SG samples.
Research and application of arsenic-contaminated groundwater remediation by manganese ore permeable reactive barrier
Published in Environmental Technology, 2021
Yao Li, Yongbing Huang, Weishan Wu, Mengmeng Yan, Yiting Xie
TiO2 has a good removal effect on arsenic in the range of pH 1–10 in water [14]. Due to the high cost of TiO2, it is not suitable for large-scale use in engineering practice. Therefore, in the research of this project, the ore containing TiO2 was selected for research. TiO2 can be classified into anatase type, rutile type and brookite type. In general, anatase TiO2 has greater photocatalytic activity than rutile TiO2; but it can be converted to rutile TiO2 under certain conditions. In contrast, the rutile TiO2 has the most stable crystal structure[15]. In this experiment, anatase and rutile were selected as ores, and mixed with manganese ore after grinding. It aimed to explore the arsenic removal effect of the mixed materials and find the best mixing ratio.
Green synthesis: Photocatalytic degradation of textile dyes using metal and metal oxide nanoparticles-latest trends and advancements
Published in Critical Reviews in Environmental Science and Technology, 2020
P. C. Nagajyothi, S. V. Prabhakar Vattikuti, K. C. Devarayapalli, K. Yoo, Jaesool Shim, T. V. M. Sreekanth
In recent years, TiO2 NPs has been broadly used as an eco-friendly photocatalyst because of their reasonable optical, electrical, and electrochemical properties, , chemical stability, abundance, low cost, and nontoxicity (Malarkodi, Chitra, et al., 2013; Vidhyadharan, Archana, Ismail, Yusoff, & Jose, 2015; Barkhade & Banerjee, 2018). TiO2 an important n-type wide bandgap semiconductor, exhibits three crystalline phases, anatase, brookite, and rutile (Gong et al., 2015). Anatase is the most thermodynamically stable for particles size <11nm, while brookite is the metastable phase for particles in the range 11–35 nm and rutile are the most stable for particle sizes are > 35 nm (Dorian & Charles, 2011; Kovács et al., 2015). Furthermore, the anatase (bandgap 3.2 eV) phase is generally considered as a more active photocatalyst than the rutile (bandgap 3.0 eV) phase (Lu et al., 2013).