Different photo-catalytic degradation of methylene blue by varied ZnO nanorods on dissimilar stainless steel wire sieves

Abstract

Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

Regulation of the Volume Flow Rate of Aqueous Methyl Blue Solution and the Wettability of CuO/ZnO Nanorods to Improve the Photodegradation Performance of Related Microfluidic Reactors

“…This indicates that its surface is most hydrophilic. It is due to the most surface hydroxyl groups attached upon the Gaussian random rough surface of CuO-1/ZnONRs …”

“…It is due to the most surface hydroxyl groups attached upon the Gaussian random rough surface of CuO-1/ ZnONRs. 14 Effect of the Volume Flow Rate Q on the Kinetic Adsorption Rate Constant K a and Initial Rate Constant K A . Figure S1 shows that on the horizontal section of the CuO/ZnONR-based microchannel except at the inlet and outlet the MB fluid entirely moves forward as a twodimensional parallel flow in the microchannel, and the change of the fluid velocity is negligible.…”

“…Due to their excellent advantages like complete mineralization of pollutants, no requirement for the disposal of sludge, and low energy consumption, several photocatalytic degradation techniques with dispersive nanostructured catalyst or substrate-supported nanostructured catalyst or catalyst-coated macroscale channel, or nanostructured catalyst-based microfluidic reactor have been put forward to carbonize relevant organic species in wastewater. Of all these photocatalytic degradation techniques, the nanostructured catalyst-based microfluidic reactor has been more often used thanks to its large surface-to-volume ratio, short diffusion distance and rapid mass transport process of molecules from an aqueous solution to catalysts, high illumination homogeneity, and accurate irradiation on nanostructured catalysts, no need of postseparation and recovery which are common for suspended catalysts, and 2 orders of magnitude higher photocatalytic efficiency. − The nanostructured catalysts mainly include metal oxide or sulfide semiconductors (that is, BiVO 4 , ZnO, , TiO 2 , , ZnS, and WO 3 ), noble metal-doped metal oxide semiconductors − (for instance, Ag/ZnO, Ga/ZnO, and Au/ZnO), and surface-sensitized metal oxide semiconductors (namely, C 60 /ZnO, Graphene/ZnO, and CuO/ZnO). Owing to the unique structure of the p-n heterojunction and the effectual inhibition of the combination of photogenerated electrons and holes, the nanostructured CuO/ZnONRs have excellent photodegradation performance and thus have been widely employed to construct various microfluidic reactors. − In regard to the evaluation of the photodegradation performance of these nanostructured catalyst-based microfluidic reactors, the experimental and numerical routes and eq have been invariably used in the literature, − where K A (min –1 ) is initial rate constant, K a (min –1 ) is kinetic adsorption rate constant, and K Lev (min –1 ) is mass transport-controlled constant.…”

“…Of all these photocatalytic degradation techniques, the nanostructured catalyst-based microfluidic reactor has been more often used thanks to its large surface-to-volume ratio, short diffusion distance and rapid mass transport process of molecules from an aqueous solution to catalysts, high illumination homogeneity, and accurate irradiation on nanostructured catalysts, no need of postseparation and recovery which are common for suspended catalysts, and 2 orders of magnitude higher photocatalytic efficiency. 8−13 The nano-structured catalysts mainly include metal oxide or sulfide semiconductors (that is, BiVO 4 , 10 ZnO, 14,15 TiO 2 , 16,17 ZnS, 18 and WO 3 19 ), noble metal-doped metal oxide semiconductors 20−24 (for instance, Ag/ZnO, 22 Ga/ZnO, 23 and Au/ ZnO 24 ), and surface-sensitized metal oxide semiconductors (namely, C 60 /ZnO, 25 Graphene/ZnO, 26 and CuO/ZnO 27 ). Owing to the unique structure of the p-n heterojunction and the effectual inhibition of the combination of photogenerated electrons and holes, the nanostructured CuO/ZnONRs have excellent photodegradation performance and thus have been widely employed to construct various microfluidic reactors.…”

Stacked Wire Mesh Monoliths for the Simultaneous Abatement of VOCs and Diesel Soot

“…A great variety of wire meshes exist, the more important properties being the mesh opening, the wire diameter, and the material used [2,13,14]. These types of structures have been used in different reactions for volatile organic compound (VOC) combustion [2,15], photocatalysis [16,17], selective catalytic reduction (SCR) of NO x [18], and also in physical processes, such as oil-water separation [19].…”