Silicon carbide catalytic ceramic membranes with nano-wire structure for enhanced anti-fouling performance

Decoration of Cauliflower-Like TiO2 on Nanofibrous PVDF Membranes: A Strategy for Wastewater Treatment

“…The membrane immersed in the quartz container was subjected to UV light held ∼4 cm away from the vessel. Subsequently, the concentration of CF and MO before and after the degradation was obtained using a UV–visible spectrophotometer at λ max of ∼275 and ∼465 nm in every 30 min , The photocatalytic degradation efficiency (η) and rate constant ( k ) of CF antibiotic and MO dye was calculated by the following equation .25ex2ex η = true( 1 − C C normalo true) × 100 % .25em ln ( C o C ) = prefix− k t where C o denotes the initial conc. of CF and MO prior to irradiation and C denotes the conc.…”

“…For the identification of active species, the scavenging reagents such as EDTA-2Na, silver nitrate (AgNO 3 ), benzoquinone ( p -BZQ), and IPA were added into the reaction mixture to capture active species such as holes (h + ), electrons (e – ), superoxide radicals ( O 2 − * ) , and hydroxyl radicals (*OH), respectively . The methodology was similar to the photocatalytic activity test except that the scavenging reagents were introduced at a concentration of 1 mM.…”

Fibrous ceramic membrane constructed by mullite whiskers for the treatment of oil‐in‐water emulsions

“…The formation and growth of mullite whisker is sensitive to sintering temperature, which affects the vapor of AlF 3 and then the formation of mullite phase in the [110] direction. 15,28 Figure 2A-H shows microstructures of the ceramic membrane sintered at 1400 and 1450 • C, respectively. Evidently, a whisker-interlocked structures formed at high temperature with the aid of AlF 3 ⋅3H 2 O.…”

“…It is believed that the whiskers or fibers-constructed porous structure can give high porosity and excellent pore connectivity to the ceramic membrane, leading to high flow flux during separation and purification 13,14 ; also, because of the high specific surface area and aspect ratio, the whisker or fiber constructed porous structure enables efficient pollutant catalytic degradation by surface modification. For example, Zhu et al 15 designed heterogeneous silicon carbide ceramic membranes featuring g-C 3 N 4 decorated β-SiC nano-wire catalytic functional layer, which enabled enhanced anti-fouling self-cleaning performance. Besides, such a porous structure presents excellent mechanical properties by various toughening mechanisms such as whisker bridging, whisker deflection and whisker pullout, compared with the conventional particles-packed ceramic membrane by partial sintering.…”

“…Besides, such a porous structure presents excellent mechanical properties by various toughening mechanisms such as whisker bridging, whisker deflection and whisker pullout, compared with the conventional particles-packed ceramic membrane by partial sintering. 15,16 Mullite is an aluminosilicate ceramic with chemical composition ranging from 3Al 2 O 3 ⋅2SiO 2 to 2Al 2 O 3 ⋅SiO 2 , which is considered as an excellent material for the preparation of ceramic membrane due to the merits of high fracture strength, excellent high-temperature resistance, high chemical and thermal stability, and low bulk density. [17][18][19] Mullite whisker (3Al 2 O 3 ⋅2SiO 2 ) can be synthesized insitu at high temperature from Al 2 O 3 -SiO 2 -SiF 4 systems.…”