Relating organic fouling of reverse osmosis membranes to adsorption during the reclamation of secondary effluents containing methylene blue and rhodamine B

Li, Haigang; Lin, Yanwen; Luo, Yunbai; Yu, Ping; Hou, Liwei

doi:10.1016/j.jhazmat.2011.05.044

Cited by 55 publications

(23 citation statements)

References 38 publications

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“…On the other hand, it is interesting to note that the zeta potential characterization could provide a qualitative insight into the charge properties of the membrane active layer. According to Nghiem et al [8] and Li et al [25], the isoelectric point values of the NF270 and ESPA2 membranes are around pH 3.5 and pH 4, respectively. They are consequently net positively charged when the pH of the solution is lower than this isoelectric point value, and are negatively charged when pH is higher.…”

Section: Nf and Ro Membranesmentioning

confidence: 95%

“…NF270 membranes have a relatively smooth surface, reflected by its relatively low roughness value (8.55 nm) [24], whereas the ESPA2 membrane exhibited large-scale surface roughness (80.22 nm) [25]. Another parameter frequently used to estimate TrOC rejection is the pore size.…”

Section: Nf and Ro Membranesmentioning

confidence: 99%

“…Hence, the average pore diameter of the NF270 membrane was markedly larger than molecular dimension of salicylic acid, which might allow more salicylic acid adsorption onto the membrane surface and within its structure. Apart from these, it is important to note that the ESPA2 membrane exhibited considerable surface roughness [25]. In general, a rough membrane surface morphology would result in more adsorption of TrOCs on the membrane due to the larger surface area, leading to more opportunities for molecular contact [18,44].…”

Section: Adsorption Of Trace Organics To Nf/ro Membranesmentioning

confidence: 99%

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Factors governing the rejection of trace organic contaminants by nanofiltration and reverse osmosis membranes

Dang

Nghiem

Price

2013

Desalination and Water Treatment

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A B S T R A C TThis study aimed to elucidate key factors governing the rejection of trace organic contaminants (TrOCs) by nanofiltration (NF) and reverse osmosis (RO) membranes. The rejection of 16 selected hydrophilic and hydrophobic TrOCs by an NF and an RO membranes was evaluated at different solution pH values using a cross-flow NF/RO filtration system. An analytical technique consisting of solid phase extraction followed by gas chromatography and mass spectrometry detection was used for the analysis of the TrOCs. In general, rejection increased in the order of decreasing membrane permeability, increasing molecular weight (or equivalent molecular width) of the TrOCs, and increasing hydrophilicity. Adsorption of hydrophobic TrOCs to the membrane could be observed based on a mass balance calculation. However, the correlation between adsorption and log D value (the logarithm of the octanol-water distribution coefficient) of the TrOCs (which indicates their hydrophobicity) observed in this study was rather weak. This is due to the adsorption being not only dependent on hydrophobicity, but also on other physicochemical aspects of TrOCs and the membrane material, such as molecular size, charge of the compounds, pore size, charge, and surface roughness properties of the membranes. Therefore, the results suggest that these factors may also govern the adsorption (and subsequently rejection) of TrOCs to NF/RO membranes.

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Section: Nf and Ro Membranesmentioning

confidence: 95%

Section: Nf and Ro Membranesmentioning

confidence: 99%

Section: Adsorption Of Trace Organics To Nf/ro Membranesmentioning

confidence: 99%

See 1 more Smart Citation

Factors governing the rejection of trace organic contaminants by nanofiltration and reverse osmosis membranes

Dang

Nghiem

Price

2013

Desalination and Water Treatment

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“…There are several ways to remove RhB from wastewaters, including chemical oxidation, physico-chemical and biological processes. Some of these processes include filtration (Li et al, 2011;Xu et al, 2013), adsorption (Lacerda et al, 2015), advanced oxidation processes Ge, 2014) and biological treatment (Baldev et al, 2013). Among these, adsorption is an effective, cheaper and simple approach.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

Zimmermann

Dotto

Kuhn

et al. 2016

IJETM

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Abstract:The potential of a Brazilian natural bentonite to remove Rhodamine B (RhB) dye from aqueous solutions was evaluated. The bentonite was characterised by X-ray diffraction, thermogravimetric analysis, particle size distribution and N 2 -adsorption isotherms. The adsorption of RhB onto bentonite was evaluated in batch system. The pH effect (2.5-10.5), kinetic curves and equilibrium isotherms (initial dye concentrations from 100 to 600 mg L -1 ) were studied at 25°C and 250 rpm. It was found that the Brazilian bentonite presented a mesoporous structure with surface area of 14.35 m 2 g -1and average pore size of 28 nm. The adsorption capacity remained practically 2 B.M. Zimmermann et al.constant from pH 2.5 to pH 10.5. The Elovich model was adequate to represent the adsorption kinetic curves. Langmuir and Freundlich models were suitable to represent the adsorption isotherm. The maximum adsorption capacity was 77.3 mg g -1 , obtained at 25°C, pH of 4.5 and adsorbent dosage of 500 mg L -1 . It was demonstrated that the Brazilian bentonite can be utilised as a promising adsorbent to remove RhB from aqueous solutions.

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“…In contrast, emulsified oil is more difficult to separate due to its high stability in water [4]. Many removal technologies have been applied, but they all have disadvantages such as secondary pollutant generation in chemical treatment [5], wide space requirement and temperature and pH sensitivity in biological treatment [6], as well as membrane fouling in membrane filtration [7][8][9]. Among the physical technologies, coalescence seems to be an attractive method due to its feasibility, low operating cost and effectiveness [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Designing high-caliber nonwoven filter mats for coalescence filtration of oil/water emulsions

et al. 2015

Separation and Purification Technology

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Relating organic fouling of reverse osmosis membranes to adsorption during the reclamation of secondary effluents containing methylene blue and rhodamine B

Cited by 55 publications

References 38 publications

Factors governing the rejection of trace organic contaminants by nanofiltration and reverse osmosis membranes

Factors governing the rejection of trace organic contaminants by nanofiltration and reverse osmosis membranes

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

Designing high-caliber nonwoven filter mats for coalescence filtration of oil/water emulsions

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