Removal of trace phthalate esters from water by thin-film composite nanofiltration hollow fiber membranes

Wei, Xiuzhen; Shi, Yingying; Fei, Yaowei; Jin-yuan, Chen; Lv, Bosheng; Chen, Yongsheng; Zheng, Honglin; Shen, Juli; Zhu, Liping

doi:10.1016/j.cej.2016.02.037

Cited by 50 publications

(15 citation statements)

References 41 publications

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“…The molecular weight cut off (MWCO) of NF membranes is in the range 100–1000 Da and their pore size is expected to be of the order of the nanometer. NF membranes can thus treat solutions containing multivalent ions and organic compounds with very low molecular weight at a relatively low operation pressure [ 6 , 7 , 8 ]. This results from the combination of pore diameters of a few nanometers with electrically charged materials.…”

Section: Introductionmentioning

confidence: 99%

Removal of Sulfadiazine by Polyamide Nanofiltration Membranes: Measurement, Modeling, and Mechanisms

Zhu

Yang

2021

Membranes

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In this study, a complete steric, electrostatic, and dielectric mass transfer model is applied to investigate the separation mechanism of typical antibiotic sulfadiazine by NF90, NF270, VNF-8040 and TMN20H-400 nanofiltration membranes. FTIR and XPS analysis clearly indicate that the membranes we used possess skin layers containing both amine and carboxylic acid groups that can be distributed in an inhomogeneous fashion, leading to a bipolar fixed charge distribution. We compare the theoretical and experimental rejection rate of the sulfadiazine as a function of the pressure difference across the nanopore for the four polyamide membranes of inhomogeneously charged nanopores. It is shown that the rejection rate of sulfadiazine obtained by the solute transport model has similar qualitative results with that of experiments and follows the sequence: RNF90>RVNF2−8040>RNF270>RTMN20H−400. The physical explanation can be attributed to the influence of the inhomogeneous charge distribution on the electric field that arises spontaneously so as to maintain the electroneutrality within the nanopore.

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Section: Introductionmentioning

confidence: 99%

Removal of Sulfadiazine by Polyamide Nanofiltration Membranes: Measurement, Modeling, and Mechanisms

Zhu

Yang

2021

Membranes

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“…They found that the rejection performance of nanofiltration membrane was affected by many factors, and this effect was the result of the interaction of many kinds of forces. Wei et al [23] discussed the adsorption kinetics of five kinds of PAEs in water with hollow fiber nanofiltration membrane made in the laboratory. Owing to the greater hydrophobic adsorption and steric hindrance of the hollow fiber nanofiltration membrane, the adsorption of PAEs molecules with larger molecular weight reaches saturation for a longer time, and the rejection rate of PAEs was higher.…”

Section: State Of the Artmentioning

confidence: 99%

Adsorption and Rejection of PAEs by Modified Nanofiltration Membrane

Li¹,

Ouyang²,

Tian³

et al. 2020

JESTR

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Phthalate esters (phthalic acid esters or PAEs) are widely utilized during production as an inactive plasticizer, which results in serious water pollution. Ideal removal of micropollutants is difficult to achieve with traditional water treatment, but technology using nanofiltration membrane removes water micropollutants effectively owing to its unique membrane structure. To further study the rejection performance of nanofiltration membrane for PAEs, carbon nanotube-modified nanofiltration membrane was proposed to treat PAEs in water. The adsorption and rejection properties of PAEs on the surface of nanofiltration membrane were revealed by multi-factor experiments. Adsorption kinetics was also analyzed, and the adsorption isotherm of PAEs on the membrane surface was simulated. In addition, the effects of running time, molecular weight, n-octanol/water partition coefficient, and average polarizability on the performance of PAE rejection of nanofiltration membrane were discussed. Results show that the Freundlich adsorption equation simulates the adsorption of PAEs on the surface of the nanofiltration membrane, and the correlation coefficient is more than 0.998. The adsorption capacity of the nanofiltration membrane for three typical PAEs substances, namely, diethyl phthalate (DEP), dibutyl phthalate (DBP), and dioctyl phthalate (DOP), decreases in turn. At the same time, the early rejection of PAEs by nanofiltration membrane is primarily due to the adsorption of membrane surface, and the equilibrium stage depends mainly on the sieving effect of the membrane pores. This study provides a theoretical basis for the application of nanofiltration membrane in the removal of PAEs.

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“…The nanofiltration process is a simple and very efficient way of separating ions from water solutions. Nanofiltration, which is a relatively new pressure-driven filtration process with separation properties between reverse osmosis (RO) and ultrafiltration (UF) processes, has several advantages including higher permeability for monovalent ions, low permeability for multivalent ions, lower operating pressure, higher flux, lower energy consumption compared to RO, and lower molecular weight cut-off (200–1000 Da) compared to UF [ 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. The mass transport process in NF involves a combination of different mechanisms including steric exclusion (sieving), Donnan (charge effects) interactions, dielectric exclusion, and solute-membrane affinity [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Application of NF Polymeric Membranes for Removal of Multicomponent Heat-Stable Salts (HSS) Ions from Methyl Diethanolamine (MDEA) Solutions

et al. 2020

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This study presents an efficient and scalable process for removing the heat-stable salts (HSS) ions from amine solution while recovering methyl diethanolamine (MDEA) solution for its reuse in gas sweetening plants. The presence of HSS in the amine solution causes the loss of solvent capacity, foaming, fouling, and corrosion in gas sweetening units so their removal is crucial for a more well-performing process. Furthermore, the recovery of the amine solution can make the sweetening step a more sustainable process. In this study, for the first time, the removal of a multicomponent mixture of HSS from MDEA solution was investigated via a nanofiltration process using flat-sheet NF-3 membranes. The impact of operating parameters on salts and amine rejection, and flux, including the operating pressure, HSS ions concentration, and MDEA concentration in the feed solution was investigated. Results based on the nanofiltration of an amine stream with the same composition (45 wt.% MDEA solution) as that circulating in a local gas refinery (Ilam Gas refinery), demonstrated a removal efficiency of HSS ions in the range from 75 to 80% and a MDEA rejection of 0% indicating the possibility of reusing this stream in the new step of gas sweetening.

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Removal of trace phthalate esters from water by thin-film composite nanofiltration hollow fiber membranes

Cited by 50 publications

References 41 publications

Removal of Sulfadiazine by Polyamide Nanofiltration Membranes: Measurement, Modeling, and Mechanisms

Removal of Sulfadiazine by Polyamide Nanofiltration Membranes: Measurement, Modeling, and Mechanisms

Adsorption and Rejection of PAEs by Modified Nanofiltration Membrane

Application of NF Polymeric Membranes for Removal of Multicomponent Heat-Stable Salts (HSS) Ions from Methyl Diethanolamine (MDEA) Solutions

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