Using TiO2 Mesoflower Interlayer in Tubular Porous Titanium Membranes for Enhanced Electrocatalytic Filtration

Abstract

Keywords:functionalized tubular porous titanium membrane TiO 2 mesoflower interlayer electrocatalytic filtration anodic catalytic oxidation A B S T R A C T The current study focuses on synthesis and characterization of novel functionalized anodic membranes for wastewater treatment. This membrane was prepared by first constructing a TiO 2 mesoflower interlayer on a tubular porous titanium membrane and subsequently coating an antimony-doped tin oxide catalytic layer. Physical and electrochemical characterizations of the membranes were evaluated. With TiO 2 mesoflower, the membrane anode obtained a higher oxygen evolution potential, 2.22 V (vs saturated calomel electrode), relative roughness factor (701.7), and electrochemical porosity (99.23%) than membrane anodes without TiO 2 mesoflower. The prepared membrane anode also achieved a low charge-transfer (0.11 V) and mass-transfer resistance (0.21 V) in filtration mode. The unique features were found linked to its 3-D porous and open structure, and formation of a Ti 0.2 Sn 0.8 O 2 sosoloid that had a high surface oxygen (O ad ) content. The electrocatalytic filtration performance of this membrane was also tested using methyl orange as a model organic pollutant. At a current density of 15 mA cm À2 , the membrane achieved a higher 71.0% removal of methyl orange than 58.0% for the membrane without TiO 2 mesoflower. At a 58.0% removal of methyl orange, the membrane consumed a much lower energy of 0.20 kWh m À3 than 5.88 kWh m À3 for membrane anodes without TiO 2 mesoflower. The synthesized membrane electrode filter shows promise for future applications aimed to remove organic pollutants from wastewater.

Janus electrocatalytic flow-through membrane enables highly selective singlet oxygen production

“…1a, c). These sputtered depths are over an order of magnitude greater than the inner-porous reactive lengths of reported electrocatalytic membranes 67,68 . Taken together, the high dispersion of the electro-catalysts, as well as the elongated reactive regions, guarantee maximal exposure of the reactive sites in the Pd-Pt-CM.…”

ZnO Nanorod Array Modified PVDF Membrane with Superhydrophobic Surface for Vacuum Membrane Distillation Application

“…ZnO nanorod array, as an important functional material, has been used for preparing superhydrophobic surfaces in many fields. Meanwhile, for growing metal oxide nanorods, the hydrothermal method has been believed as an effective way at low reaction temperature. − Choosing stainless steel mesh as the substrate, Tian et al grew a layer of ZnO nanorod array on the substrate via sintering treatment at 420 °C for coating ZnO seeds and hydrothermal reaction for growing ZnO nanorods, and further, put the sample under UV irradiation for 0.5 h to realize a superhydrophobic surface . By sintering the mixture of PVDF powder and Zn­(Ac) 2 -based crystalline powder at its melting temperature of ∼270 °C to form the ZnO seeds in the PVDF material, Wen et al fabricated a superhydrophobic ZnO nanorods modified PVDF surface with robust antifogging and icing-delay properties .…”

Membrane Separation Coupled with Electrochemical Advanced Oxidation Processes for Organic Wastewater Treatment: A Short Review

“…Our group has also investigated various REMs in the form of titanium-based metallic oxide electrodes, such as RuO 2 , SnO 2 -Sb, PbO 2 , and RuO 2 -Sb 2 O 5 -SnO 2 , and all electrodes have shown excellent performance for contaminant removal in both simulated and actual wastewaters [ 14 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ]. To date, many kinds of REMs with new catalytic layers have been developed for different purposes (see Figure 2 ) [ 2 , 5 , 6 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 ].…”