Effect of TiO2 doping on the characteristics of macroporous Al2O3/TiO2 membrane supports

Qi, Hong; Fan, Yiqun; Xing, Weihong; Winnubst, Louis

doi:10.1016/j.jeurceramsoc.2009.12.011

Cited by 72 publications

(23 citation statements)

References 14 publications

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“…The skin layer has remained as the functional layer which decreases the water vapor transfer resistance and increases permeate flux in SGMD. The bending strength of M2 is 25 MPa, which is comparable with ceramic membranes reported in the literature [23,24]. The X-ray diffractograms of the M2 membranes sintered at 1700 are shown in Fig.…”

Section: Membrane Characteristicssupporting

confidence: 81%

Preparation of high-efficiency ceramic planar membrane and its application for water desalination

Tao

et al. 2018

J Adv Ceram

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Highly efficient Si 3 N 4 ceramic planar membrane for water desalination process using membrane distillation was prepared by the dual-layer phase inversion tape casting and sintering method. In comparison with typical phase inversion tape casting method, the green tape was formed using Si 3 N 4 slurry on the top and graphite slurry on the bottom. After consuming away the graphite structure, a ceramic membrane consisting of a two-layered structure (skin and finger-like layers) was obtained. The skin layer was relatively tight, and thus could act as a functional layer for separation, while the finger-like layer contained straight open pores with a diameter of 100 μm, acting as a support with low transport resistance. For comparison, typical Si 3 N 4 ceramic membrane was fabricated by phase inversion technique without graphite substrate, resulting in a three-layered structure (skin, finger-like, and sponge layers). After membrane modification from hydrophilic to hydrophobic with polymer derived nanoparticle method, the water desalination performance of the membranes was tested using the sweeping gas membrane distillation (SGMD) with different NaCl feed solutions. With the increase of salt content from 4 to 12 wt%, the water flux decreased slightly while rejection rate maintained over 99.99%. Comparing with typical three-layered Si 3 N 4 membrane, an excellent water flux enhancement of over 83% was resulted and the rejection rate remained over 99.99%.

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Section: Membrane Characteristicssupporting

confidence: 81%

Preparation of high-efficiency ceramic planar membrane and its application for water desalination

Tao

et al. 2018

J Adv Ceram

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“…The rejection rate of CB0 obtained in this work is 96.7% with a membrane flux of 6.3 © 10 ¹5 m 3 /m 2 s at a pressure of 101 kPa. Based on the above Journal of the Ceramic Society of Japan 122 [9] 788-794 2014 comparisons, the rejection rate and flux of the low-cost membranes reported in this work are better than those of other lowcost ceramic membranes reported in the literature.…”

Section: Microfiltration Of An Oil-in-water Emulsionmentioning

confidence: 55%

“…Both the total porosity and open porosity increased with increasing carbon black content. The total porosity increased from 34% at 0 wt % carbon black to 44% at 10 wt % carbon black, whereas the closed Journal of the Ceramic Society of Japan 122 [9] 788-794 2014 porosity decreased from 1.7 to 0.4% when the carbon black content increased from 0 to 10 wt %. This was due to the higher possibility of the interconnection of pores at the higher carbon black content.…”

Section: Membrane Preparation and Characterizationmentioning

confidence: 93%

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Low-cost clay-based membranes for oily wastewater treatment

Eom

Kim

Yun

et al. 2014

J. Ceram. Soc. Japan

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Low-cost clay-based membranes with an excellent flexural strength were successfully prepared by a simple pressing route using low cost starting materials, such as kaolin, bentonite, talc, sodium borate, and carbon black, and subsequent sintering at 1000°C. Carbon black was added as a template. The effect of carbon black content on porosity, flexural strength, pore size distribution, pure water permeability, oil rejection rate, and flux of low-cost clay-based membranes was investigated. It was found that the porosity and pore size of membranes increased with increasing carbon black content, whereas the flexural strength decreased with an increase in carbon black content. The pure water permeability increased with an increase in porosity. The oil rejection rate decreased with increasing applied pressure and carbon black content. Typical porosity, flexural strength, oil rejection rate, and flux of clay-based membranes sintered at 1000°C were 34%, 58 MPa, 96.7%, and 6.3 © 10 ¹5 m 3 /m 2 s at an applied pressure of 101 kPa, respectively.

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“…For the supported tight UF ceramic-metallic composite membranes, the metallic supports tend to expand while the ceramic membranes tend to shrink during the sintering process. The mismatch of thermal expansion produces enormous tensile stress between the metallic supports and the ceramic membranes, which results in the membranes cracking [19][20][21][22]. For the composite ceramic-metallic NF or tight UF membranes, the smaller the particles for sintering process, the higher thermal expansion mismatch existed between the ceramic membrane and metallic support.…”

Section: Introductionmentioning

confidence: 99%

Environment-benign preparation of Ag toughening TiO2/Ti tight ultrafiltration membrane via aqueous sol–gel route

et al. 2015

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A new aqueous sol was synthesized to prepare Ag-doped TiO 2 /Ti composite tight ultrafiltration (UF) membranes. This sol was prepared based on water ([95 wt%), for which the hydrodynamic size of 8 nm could be obtained by tuning the electrostatic and steric repulsive forces, breaking the limit of the polymeric solgel method to prepare tight UF membranes. For the preparation of the sol, high water content can significantly reduce the use of organic solvents and is more environment-benign. Moreover, Ag doping can considerably improve the toughness of the supported membranes to efficiently prevent the TiO 2 /Ti composite membranes from cracking and overcome the thermal expansion mismatch of ceramic membranes and their metallic supports. The prepared Ag-doped TiO 2 /Ti composite membranes presented a molecular weight cut-off of 3 kDa with a pure water flux of 24 L m -2 h -1 bar -1 and exhibited good dye removal capabilities. The proposed Ag doping method has considerable potential for the fabrication of integrated hybrid ceramic-metallic composite membranes.

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Effect of TiO2 doping on the characteristics of macroporous Al2O3/TiO2 membrane supports

Cited by 72 publications

References 14 publications

Preparation of high-efficiency ceramic planar membrane and its application for water desalination

Preparation of high-efficiency ceramic planar membrane and its application for water desalination

Low-cost clay-based membranes for oily wastewater treatment

Environment-benign preparation of Ag toughening TiO2/Ti tight ultrafiltration membrane via aqueous sol–gel route

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