Photocatalytic membrane reactor (PMR) for virus removal in water: Performance and mechanisms

Zheng, Xunhua; Wang, Qi; Chen, Lingyun; Wang, Jiangquan; Cheng, Rong

doi:10.1016/j.cej.2015.04.117

Cited by 64 publications

(20 citation statements)

References 30 publications

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“…However, with the higher concentration (7.5 to 10 mg/L) of humic acid, the obvious change had not taken place (4 log after 160 s). According to previous studies [16,27], the photocatalytic disinfection of phage f2 involved several active radicals, while hydroxyl radicals proved to be the most important role. With the participation of humic acid in photocatalytic process, the competitive relationship between the phage f2 and humic acid was established, which led to a significant decrease in the photocatalytic disinfection of phage f2 [27].…”

Section: Effect On Photocatalysismentioning

confidence: 89%

“…In recent decades, as an emerging oxidation technology, TiO 2 photocatalytic oxidation (TPO), one of the main advanced oxidation processes (AOPs), has proved to be efficient in degrading a wide range of pollutants [9,10], and inactivating both bacteria, such as Pseudomonas aeruginosa, Salmonella, Escherichia coli, and some model viruses, including MS2, ΦX174 [2,3,[11][12][13][14]. While in many types of photocatalytic reactors, the photocatalytic membrane reactor (PMR), a hybrid reactor in which photocatalysis is coupled with a membrane process, is regarded as a most promising technology to disinfect viruses and other microorganisms due to its high removal efficiency and the mild temperature and pressure conditions [15,16]. Furthermore, the recycling from treated water and aggregation of photocatalysts are effectively achieved by PMR [17].…”

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confidence: 99%

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Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

et al. 2018

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In the actual water environment, the health risk of waterborne viruses is evaluated to be 10 1 -10 4 times higher at a similar level of exposure compared with bacteria and has aroused strong concern in many countries in the world. Photocatalytic membrane reactor (PMR), a new process for virus inactivation in water, has gradually become one of the main tools to inactivate pathogenic organisms in water. However, there is relatively little attention to the effect of natural organic matters (NOMs) on the PMR system, which actually exists in the water environment. In this paper, the TiO 2 -P25, a common type in sales and marketing, was selected as the photocatalyst, and humic acid was regarded as the representative substance of NOMs for investigating thoroughly the influence of humic acid on virus removal by the PMR system. It was found that competitive adsorption between the virus and humic acid occurred, which markedly reduced the amount of virus adsorbed on the surface of the photocatalyst. Moreover, with humic acid, the direct contact behavior between the virus and the photocatalyst was blocked to some extent, and the disinfection of phage f2 by the active free radicals produced by photocatalysis was furthermore badly affected. Meanwhile, the special structure of humic acid, which made humic acid be able to absorb light of 270-500 nm, led to the reduction of photocatalytic efficiency. Further experiments showed that when there was a certain concentration of humic acid in water, intermittent operation mode or higher membrane flux (>40 L/(m 2 ·h)) was selected to partly alleviate the adverse effects of humic acid.

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Section: Effect On Photocatalysismentioning

confidence: 89%

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confidence: 99%

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

et al. 2018

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“…In addition, the permeate flux rate of MF membrane was improved when the commercial P25 was replaced by nano-structured TiO2, thus reducing the membrane fouling phenomenon. Similar integrative PMR configurations were also applied in other studies for the removal of virus [74], para-chlorobenzoate [75] and secondary effluent organics [76]. …”

Section: Integrative-type Pmrs With Suspended Photocatalystmentioning

confidence: 99%

Photocatalytic Membrane Reactors (PMRs) in Water Treatment: Configurations and Influencing Factors

et al. 2017

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Abstract:The lack of access to clean water remains a severe issue all over the world. Coupling photocatalysis with the membrane separation process, which is known as a photocatalytic membrane reactor (PMR), is promising for water treatment. PMR has developed rapidly during the last few years, and this paper presents an overview of the progress in the configuration and operational parameters of PMRs. Two main configurations of PMRs (PMRs with immobilized photocatalyst; PMRs with suspended photocatalyst) are comprehensively described and characterized. Various influencing factors on the performance of PMRs, including photocatalyst, light source, water quality, aeration and membrane, are detailed. Moreover, a discussion on the current problems and development prospects of PMRs for practical application are presented.

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“…Most of the contaminants are difficult to degrade in the natural environment, thus it will endanger the environment and human health . Treatment of pollutants is usually divided into three categories: physical, chemical and biological methods . In recent years, applications to environmental cleanup have been one of the most active areas in heterogeneous photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Morphological Effect in Photocatalytic Degradation of Direct Blue over Mesoporous TiO₂ catalysts

Zhang

Zhu

et al. 2017

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The correlation of photo‐catalyst morphological structure and catalytic performance is one of the biggest challenges in the photo‐catalysis field. This work address a thorough investigation on the relationship between catalyst morphological structure and catalytic performance for the degradation of Direct Blue under ultraviolet light illumination. Four anatase Titanium dioxide catalysts with a slice‐, bipyramids‐, daisy‐, and sphere‐like morphologies were prepared by hydrothermal methods and well characterized by a serial of characterization techniques. By evaluating the photo‐catalytic performance over four kinds of TiO2 with different morphologies, the structure‐performance relationship of degradation of Direct Blue could be well illustrated. The degradation efficiency of TiO2 catalyst did much depend on the structure of catalyst shapes. The daisy‐like TiO2 catalyst exhibited the most excellent catalytic performance for the degradation of DB, which was attributed to the lowest band gap energy evidenced by UV‐vis spectrum.

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Photocatalytic membrane reactor (PMR) for virus removal in water: Performance and mechanisms

Cited by 64 publications

References 30 publications

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Photocatalytic Membrane Reactors (PMRs) in Water Treatment: Configurations and Influencing Factors

Morphological Effect in Photocatalytic Degradation of Direct Blue over Mesoporous TiO₂ catalysts

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Photocatalytic membrane reactor (PMR) for virus removal in water: Performance and mechanisms

Cited by 64 publications

References 30 publications

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Photocatalytic Membrane Reactor (PMR) for Virus Removal in Drinking Water: Effect of Humic Acid

Photocatalytic Membrane Reactors (PMRs) in Water Treatment: Configurations and Influencing Factors

Morphological Effect in Photocatalytic Degradation of Direct Blue over Mesoporous TiO2 catalysts

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Morphological Effect in Photocatalytic Degradation of Direct Blue over Mesoporous TiO₂ catalysts