Ultrafiltration of water containing natural organic matter: heavy metal removing in the hybrid complexation–ultrafiltration process

Alpatová, Alla; Verbych, S.; Bryk, M. T.; Nigmatullin, Rinat; Hilal, Nidal

doi:10.1016/j.seppur.2004.02.003

Cited by 80 publications

(32 citation statements)

References 12 publications

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“…4 and mentioned previously, the rejections of all four model compounds increase with an increase of pH. The same phenomenon also was observed by Alpatova et al [28] that the rejection ratios of humic substances at high pH were noticeably higher than those of low pH. The increase of rejection ratio at high pH could be due to the polyelectrolyte character of model compounds and the negatively charged characteristic of NF70 membrane.…”

Section: Effect Of Ph On Compound Rejection and Permeate Fluxsupporting

confidence: 86%

“…The decrease of membrane fouling with the increase of pH could be caused by several factors. As mentioned above, at low pH value, model compounds are neutrally charged, coiled and compacted so that the adsorbed or deposited model compounds on the membrane surface form boundary layers with higher hydraulic resistance resulting in reduction of permeate flux [28]. Under this circumstance, model compounds become less soluble and have a tendency to be adsorbed on hydrophobic materials.…”

Section: Effect Of Ph On Compound Rejection and Permeate Fluxmentioning

confidence: 99%

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Reduction of disinfection by-products precursors by nanofiltration process

Lin

Chiang

Chang

2006

Journal of Hazardous Materials

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Section: Effect Of Ph On Compound Rejection and Permeate Fluxsupporting

confidence: 86%

Section: Effect Of Ph On Compound Rejection and Permeate Fluxmentioning

confidence: 99%

Reduction of disinfection by-products precursors by nanofiltration process

Lin

Chiang

Chang

2006

Journal of Hazardous Materials

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“…Likewise, Illes et al (22) Effects of Environmental Parameters. The binding of heavy metals to HA is mainly controlled by the source and concentration of HA, metal ion concentration, pH, and other parameters (24,(37)(38)(39). Therefore, it is important to study if the variance of these parameters in the environmentally relevant range would influence the removal of heavy metals by Fe3O4/HA.…”

Section: Resultsmentioning

confidence: 99%

Coating Fe₃O₄ Magnetic Nanoparticles with Humic Acid for High Efficient Removal of Heavy Metals in Water

Liu

Zhao

Jiang

2008

Environ. Sci. Technol.

1,040

481

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Humic acid (HA) coated Fe 3 O 4 nanoparticles (Fe 3 O 4 /HA) were developed for the removal of toxic Hg(II), Pb(II), Cd(II), and Cu(II) from water. Fe 3 O 4 /HA were prepared by a coprecipitation procedure with cheap and environmentally friendly iron salts and HA. TOC and XPS analysis showed the as-prepared Fe 3 O 4 / HA contains ∼11% (w/w) of HA which are fractions abundant in O and N-based functional groups. TEM images and laser particle size analysis revealed the Fe 3 O 4 /HA (with ∼10 nm Fe 3 O 4 cores) aggregated in aqueous suspensions to form aggregates with an average hydrodynamic size of ∼140 nm. With a saturation magnetization of 79.6 emu/g, the Fe 3 O 4 /HA can be simply recovered from water with magnetic separations at low magnetic field gradients within a few minutes. Sorption of the heavy metals to Fe 3 O 4 /HA reached equilibrium in less than 15 min, and agreed well to the Langmuir adsorption model with maximum adsorption capacities from 46.3 to 97.7 mg/g. The Fe 3 O 4 /HA was stable in tap water, natural waters, and acidic/ basic solutions ranging from 0.1 M HCl to 2 M NaOH with low leaching of Fe (e3.7%) and HA (e5.3%). The Fe 3 O 4 /HA was able to remove over 99% of Hg(II) and Pb(II) and over 95% of Cu(II) and Cd(II) in natural and tap water at optimized pH. Leaching back of the Fe 3 O 4 /HA sorbed heavy metals in water was found to be negligible.

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“…is present, in concordance to Pb(II) speciation diagram or alkaline pH values interaction of metal ions with polymer can cause precipitation of metal hydroxide, but still metal ions are able to be removed via polymer-assisted ultrafiltration (Alpatova et al 2004;Barakat and Schmidt 2010). They also concluded that at pH higher than 7, most of Pb(II) species present in metal solutions are in low concentration, but still, the possibility for membrane fouling is high due to metal ion-polymer complexes that are able to completely retain on the membrane which enhances membrane pore blocking (Alpatova et al 2004). At pH 10, Pb(II) ions retention is decreased due to the presence of three cationic species, namely Pb 2 (OH) 3 ?…”

Section: Effect Of Ph On Zn(ii) Ion Retention By Polymerenhanced Ultrmentioning

confidence: 95%

Removal of zinc and lead ions by polymer-enhanced ultrafiltration using unmodified starch as novel binding polymer

Baharuddin

Sulaiman

Aroua

2014

Int. J. Environ. Sci. Technol.

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The removal of zinc and lead from aqueous dilute solutions by polymer-enhanced ultrafiltration process using unmodified starch as a new binding polymer was studied. Experiments were performed to determine the effects of transmembrane pressure, pH, concentration of metal ions on the retention and permeate flux. The performance of the proposed new binding polymer was compared to that of polyethyleneimine a conventional polymer frequently used in polymer-enhanced ultrafiltration. The retention of zinc and lead ions reached 96 and 66 %, respectively, using 0.05 % unmodified starch at pH 7. Overall unmodified starch showed better retention for zinc ions then polyethyleneimine, whereas polyethyleneimine retention for lead ions was higher. Solution pH was found to have little effect on flux.

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Ultrafiltration of water containing natural organic matter: heavy metal removing in the hybrid complexation–ultrafiltration process

Cited by 80 publications

References 12 publications

Reduction of disinfection by-products precursors by nanofiltration process

Reduction of disinfection by-products precursors by nanofiltration process

Coating Fe₃O₄ Magnetic Nanoparticles with Humic Acid for High Efficient Removal of Heavy Metals in Water

Removal of zinc and lead ions by polymer-enhanced ultrafiltration using unmodified starch as novel binding polymer

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Ultrafiltration of water containing natural organic matter: heavy metal removing in the hybrid complexation–ultrafiltration process

Cited by 80 publications

References 12 publications

Reduction of disinfection by-products precursors by nanofiltration process

Reduction of disinfection by-products precursors by nanofiltration process

Coating Fe3O4 Magnetic Nanoparticles with Humic Acid for High Efficient Removal of Heavy Metals in Water

Removal of zinc and lead ions by polymer-enhanced ultrafiltration using unmodified starch as novel binding polymer

Contact Info

Product

Resources

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Coating Fe₃O₄ Magnetic Nanoparticles with Humic Acid for High Efficient Removal of Heavy Metals in Water