Modification of ultrafiltration membrane with nanoscale zerovalent iron layers for humic acid fouling reduction

Ma, Baiwen; Yu, Wenzheng; Jefferson, William A.; Liu, Huijuan; Qu, Jiuhui

doi:10.1016/j.watres.2014.12.034

Cited by 53 publications

(16 citation statements)

References 43 publications

(57 reference statements)

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“…Although most of the lab-scale, pilot-scale and field demonstration studies targeted soil and groundwater remediation, nZVI has also been successfully applied for the stabilization of biosolids [5], the removal of phosphorus [6,7], the decoloration of dyes [8,9], as a membrane anti-fouling agent [10] and for the treatment of nuclear waste, explosives and herbicides [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Chekli

Bayatsarmadi

Sekine

et al. 2016

Analytica Chimica Acta

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Zero-valent iron nanoparticles (nZVI) have been widely tested as they are showing significant promise for environmental remediation. However, many recent studies have demonstrated that their mobility and reactivity in subsurface environments are significantly affected by their tendency to aggregate. Both the mobility and reactivity of nZVI mainly depends on properties such as particle size, surface chemistry and bulk composition. In order to ensure efficient remediation, it is crucial to accurately assess and understand the implications of these properties before deploying these materials into contaminated environments. Many analytical techniques are now available to determine these parameters and this paper provides a critical review of their usefulness and limitations for nZVI characterisation. These analytical techniques include microscopy and light scattering techniques for the determination of particle size, size distribution and aggregation state, and X-ray techniques for the characterisation of surface chemistry and bulk composition. Example characterisation data derived from commercial nZVI materials is used to further illustrate method strengths and limitations. Finally, some important challenges with respect to the characterisation of nZVI in groundwater samples are discussed.

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Section: Introductionmentioning

confidence: 99%

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Chekli

Bayatsarmadi

Sekine

et al. 2016

Analytica Chimica Acta

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“…All chemicals used were analytical reagent grade unless otherwise specified, and the stock solutions were prepared using deionized (DI) water (Millipore, Milli-Q). Humic acid sodium salt (HA, Aldrich, USA) is typically used to represent HS [6,19], and was stored in the dark at 4°C (10 g/L). Bovine serum albumin (BSA, Sinopharm Chemical Reagent, Co., Ltd, China; 67 kDa) is usually used as a representative of protein [30].…”

Section: Chemical Reagentsmentioning

confidence: 99%

“…Up to now, various kinds of adsorption materials have been coated or layered onto the surface of membranes to investigate their adsorption/rejection properties with various target pollutants, and less membrane fouling was indeed observed. However, the use of powdered activated carbon (PAC) alone could cause severe membrane damage by shearing the membrane surface, especially after long running time [16], while the high cost of other adsorbents prohibited their use in actual operations, for example carbon nanotubes (CNTs) [13], heated iron oxide particles (HIOPs) [17], heated aluminum oxide particles (HAOPs) [18], nanoscale zerovalent iron (NZVI) [19], and so on. In addition, some adsorbents were found to exhibit preferential removal ability toward specific pollutants, while performing worse on removal of other types.…”

Section: Introductionmentioning

confidence: 99%

“…The concentration of humic substances and proteins are in the range of a few mg/L to a few hundred mg/L C [26,27]. Owing to their large molecular weight distributions and physical properties, severe UF membrane fouling is inevitably induced [19,28,29]. Herein, this study focuses on an UF membrane with pre-deposited Al-based flocs, aiming to understand the characteristics of membrane fouling caused by humic substances and proteins.…”

Section: Introductionmentioning

confidence: 99%

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Antifouling by pre-deposited Al hydrolytic flocs on ultrafiltration membrane in the presence of humic acid and bovine serum albumin

Wang

et al. 2017

Journal of Membrane Science

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Pre-deposition technology is a promising method for alleviating membrane fouling, and in situ hydrolytic flocs have strong adsorption ability. In comparison with iron salts, less corrosiveness is induced by aluminum salts. Here, flocs formed by aluminum salts were pre-deposited onto the surface of an ultrafiltration (UF) membrane, aimed at investigating the antifouling performance with humic acid (HA) or bovine serum albumin (BSA). The results showed that Al-based flocs were well distributed onto the membrane surface, and a relatively dense and homogeneous deposition layer was formed. Both HA and BSA could largely be adsorbed/rejected by the predeposited layer during filtration. In comparison to results for solution pH of 8.0, the floc layer was much denser with a larger surface specific area and smaller average pore diameter at pH 6.0. Due to the existence of Al 13 species, a more positively charged floc layer occurred at lower pH values, leading to stronger adsorption abilities toward the negatively charged HA and BSA molecules. The floc layer significantly reduced the possibility of HA and BSA molecules reaching the UF membrane, which helped alleviate membrane fouling under lower pH conditions. Furthermore, the results for effluent with pH between 6.0 and 8.0 showed that the removal efficiency of HA molecules with small molecular weight (< 3 kDa) was also higher, especially at pH 6.0.

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“…It is also reported that chitosan fiber-supported nZVI particles was an excellent sorbent material for inorganic arsenic uptake at concentration ranging from 0.01 to 5.00 mg/L (Horzum et al, 2013). Compared with individual nZVI particle, the nZVI-immobilized mat can not only be used as an in-situ treatment method, like a classical permeable reactive barrier (PRB) process (Wilkin et al, 2014), but also be used as a pump & treat technology, like a typical filtration process (Ma et al, 2015). Thus, there are more forms and opportunities for the applications of the nZVIimmobilized mat in groundwater remediation.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of nanoscale zero-valent iron immobilization onto electrospun polymeric nanofiber mats for groundwater remediation

Ren

Woo

Yao

et al. 2017

Process Safety and Environmental Protection

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A new approach that combines nanoscale zero-valent iron (nZVI) with electrospinning technology has been put forward to avoid nZVI agglomeration and a secondary pollution. In this study, to enhance the immobilization of nZVI particles onto the polyacrylic acid (PAA) / polyvinyl alcohol (PVA) electrospun nanofiber mat, mats (M1,M2 and M3) with different PAA/PVA mass ratios (1:1, 2:1 and 3:1) were tested for the immobilization of nZVI particles and their performance of removing contaminants. The results indicate that M3 immobilized the most nZVI particles (48.4 wt% on the mat, ~2.5 times the figure for previous study) and had the highest removals to methylene blue and Cu(II) ions at 94% and 83.6% respectively, resulting from more free carboxylic groups available on the cross-linked nanofibers as well as a higher porosity into the mat. Therefore, increasing the PAA/PVA ratio is effective to boost the performance of nZVI-PAA/PVA electrospun nanofiber mat, which has a great potential for the application of nZVI-targeted contaminants remediation.Polyacrylic acid (PAA, Mv = 450,000), polyvinyl alcohol (PVA, 87-89% hydrolysed, Mw = 85,000-124,000), ferrous (II) sulphate heptahydrate (FeSO4·7H2O), sodium borohydride (NaBH4), cupric(II) nitrate (Cu(NO3)2), methylene blue and ethanol were all purchased from Sigma-Aldrich. Deionized (DI) water from a Millipore Milli-Q water system was used; all the oxygen-free water was prepared by purging nitrogen gas for 10 mins to remove the dissolved oxygen and avoid the oxidation of the nZVI. Electrospinning and cross-linking of PAA/PVA nanofiber matsThe electrospinning set-up is shown in Fig.1. Nanofibers were directly fabricated onto a rotating drum collector covered with baking paper in a sealed chamber (Woo et al., 2015). All the fabricated mats were electrospun at an employed voltage of 10-20 kV. The tip-to-collector distance (TCD) was 15 cm and the feed flow rate was controlled at 0.5 ml/hr by a syringe pump.

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Modification of ultrafiltration membrane with nanoscale zerovalent iron layers for humic acid fouling reduction

Cited by 53 publications

References 43 publications

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Antifouling by pre-deposited Al hydrolytic flocs on ultrafiltration membrane in the presence of humic acid and bovine serum albumin

Enhancement of nanoscale zero-valent iron immobilization onto electrospun polymeric nanofiber mats for groundwater remediation

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