Self-cleaning BiOBr/Ag photocatalytic membrane for membrane regeneration under visible light in membrane distillation

Guo, Jiaxin; Yan, Dickson Y.S.; Lam, Frank Leung Yuk; Deka, Bhaskar Jyoti; Lv, Xincong; Ng, Yun Hau; An, Alicia Kyoungjin

doi:10.1016/j.cej.2019.122137

Cited by 60 publications

(24 citation statements)

References 41 publications

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“…Furthermore, the effectiveness of UV irradiation and ultrasonic cleaning has also been demonstrated for CA recovery in MD applications. ,, A self-cleaning BiOBr/Ag membrane showed much higher CA recovery (92.2%) after UV exposure than commercial PVDF and PTFE membranes (51.2–62.3%) . Ultrasonic cleaning for 30 min increased the mean CA of the fouled PVDF membrane from 77° to 98° (CA of a virgin membrane was 109.4°) …”

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 98%

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A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Chang

Liu

Zhang

et al. 2020

Environ. Sci. Technol.

137

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Hydrophobic membranes used in membrane distillation (MD) systems are often subject to wetting during long-term operation. Thus, it is of great importance to fully understand factors that influence the wettability of hydrophobic membranes and their impact on the overall separation efficiency that can be achieved in MD systems. This Critical Review summarizes both fundamental and applied aspects of membrane wetting with particular emphasis on interfacial interaction between the membrane and solutes in the feed solution. First, the theoretical background of surface wetting, including the relationship between wettability and interfacial interaction, definition and measurement of contact angle, surface tension, surface free energy, adhesion force, and liquid entry pressure, is described. Second, the nature of wettability, membrane wetting mechanisms, influence of membrane properties, feed characteristics and operating conditions on membrane wetting, and evolution of membrane wetting are reviewed in the context of an MD process. Third, specific membrane features that increase resistance to wetting (e.g., superhydrophobic, omniphobic, and Janus membranes) are discussed briefly followed by the comparison of various cleaning approaches to restore membrane hydrophobicity. Finally, challenges with the prevention of membrane wetting are summarized, and future work is proposed to improve the use of MD technology in a variety of applications.

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Section: Restoring Membrane Hydrophobicitymentioning

confidence: 98%

“…196 Furthermore, the effectiveness of UV irradiation and ultrasonic cleaning has also been demonstrated for CA recovery in MD applications. 217,263,264 (51.2−62.3%). 263 Ultrasonic cleaning for 30 min increased the mean CA of the fouled PVDF membrane from 77°to 98°(CA of a virgin membrane was 109.4°).…”

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Chang

Liu

Zhang

et al. 2020

Environ. Sci. Technol.

137

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“…17 However, the low efficiency of photogenerated electron-hole pair separation still limits its application. 18 To promote the separation efficiency of electron-hole pairs, BiOBr is composited with C 3 N 4 , 19 TiO 2 , 20 Ag, 21,22 Bi 2 WO 6 , 23 BiOX 24,25 and graphene oxide. 26 Nevertheless, many researchers have found that CIP absorbed quickly on the surface of the catalyst to achieve rapid degradation by the combination of photocatalysts and carbon materials because added carbon materials also inhibit the recombination of electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

Novel BiOBr by compositing low-cost biochar for efficient ciprofloxacin removal: the synergy of adsorption and photocatalysis on the degradation kinetics and mechanism insight

et al. 2021

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“…For example., Zhang et al 45 demonstrated in situ recovery of the water-rich permeate flux utilizing a nitrogen doped TiO 2 coated membrane under visible light illumination. Guo et al 46 fabricated a photocatalytic membrane by utilizing BiOBr/Ag nanoparticles that can degrade organic dyes (e.g., methylene Blue, crystal Violet, acid Red 18, and acid Yellow 36) upon UV light illumination and recover the water-rich permeate flux. Liu et al 47 fabricated a PVDF-Ni-ZnO composite membrane and demonstrated in situ photocatalysis-driven recovery of the water-rich permeate flux during the filtration of an aqueous solution dissolved with organic substances (e.g., humic acid, sodium alginate, bovine serum albumin).…”

Section: Introductionmentioning

confidence: 99%

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

Shrestha

Ezazi

Rad

et al. 2021

Sci Rep

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Membrane-based separation technologies are attractive to remediating unconventional water sources, including brackish, industrial, and municipal wastewater, due to their versatility and relatively high energy efficiency. However, membrane fouling by dissolved or suspended organic substances remains a primary challenge which can result in an irreversible decline of the permeate flux. To overcome this, membranes have been incorporated with photocatalytic materials that can degrade these organic substances deposited on the surface upon light illumination. While such photocatalytic membranes have demonstrated that they can recover their inherent permeability, less information is known about the effect of photocatalysis on the kinetics of the permeate flux. In this work, a photocatalytic mesh that can selectively permeate water while repelling oil was fabricated by coating a mixture of nitrogen-doped TiO2 (N-TiO2) and perfluorosilane-grafted SiO2 (F-SiO2) nanoparticles on a stainless steel mesh. Utilizing the photocatalytic mesh, the time-dependent evolution of the water-rich permeate flux as a result of photocatalytic degradation of the oil was studied under the visible light illumination. A mathematical model was developed that can relate the photocatalytic degradation of the organic substances deposited on a mesh surface to the evolution of the permeate flux. This model was established by integrating the Langmuir–Hinshelwood kinetics for photocatalysis and the Cassie–Baxter wettability analysis on a chemically heterogeneous mesh surface into a permeate flux relation. Consequently, the time-dependent water-rich permeate flux values are compared with those predicted by using the model. It is found that the model can predict the evolution of the water-rich permeate flux with a goodness of fit of 0.92.

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Self-cleaning BiOBr/Ag photocatalytic membrane for membrane regeneration under visible light in membrane distillation

Cited by 60 publications

References 41 publications

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Novel BiOBr by compositing low-cost biochar for efficient ciprofloxacin removal: the synergy of adsorption and photocatalysis on the degradation kinetics and mechanism insight

Predicting kinetics of water-rich permeate flux through photocatalytic mesh under visible light illumination

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