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Bulk production of porous TiO2 nanowires by unique solvo-plasma oxidation approach for combating biotic and abiotic water contaminants |
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| Authors: | Afreen Gul Lara-Ramos Jose Antonio Vidwans Niraj Ashutosh Atla Veerendra Kumar Vivekanand Vaddiraju Sreeram Machuca-Martinez Fiderman Sunkara Mahendra K. Upadhyayula Sreedevi |
| Affiliation: | 1.Department of Chemical Engineering, Indian Institute of Technology Delhi, New Delhi, India ;2.Escuela de Ingeniería Química, Universidad del Valle, Cali, Colombia ;3.Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, USA ;4.Department of Chemical Engineering, University of Louisville, Louisville, KY, USA ;5.Advanced Energy Materials (ADEM), LLC., 311 E. Lee Street, Louisville, KY, 40208, USA ; |
| Abstract: | Pure, porous titania nanowires (TiO2-pNW) are produced in bulk amount (~?250 kg/day, reaction time scale?2-pNW is tested for destruction of Rhodamine B (RhB) dye, tetracycline (TC) antibiotic, and diclofenac (DFC) and caffeine (CAF) drugs. In the case of biotic contaminants, the disinfection of E. coli bacteria is demonstrated. In all of the studies, the photocatalytic performance of anatase TiO2-pNW is compared to that of commercially available P25 nanoparticles (TiO2-P25), both in the presence and absence of ozone. The excellent photoactivity exhibited by TiO2-pNW is a result of low recombination rate of electron–hole pair owing to the spatial separation of electrons and holes within the photoexcited nanowires. Moreover, the scavenger experiments and experiments involving ozone reveal that electron transfer and/or presence of dissolved oxygen are the major limiting factors for both porous titania nanowires and P25 spherical powder under UV exposure with photocatalytic activity towards pollutant degradation. |
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