Filtration studies of selected anionic dyes using asymmetric titanium dioxide membranes on porous stainless-steel tubes

Porter, John J.; Porter, Regina S.

doi:10.1016/0376-7388(94)00278-7

Cited by 22 publications

(5 citation statements)

References 3 publications

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“…As the fiber diameters of the polyurethanes were lesser in size (PU 918=174±56, PU Elastollan=179±45), their surface area is larger as a consequence (20.9 and 18.3, respectively), providing sufficient availability of active sites for adsorption of the estrogens, as detailed in table 2. Electrostatic charge can also affect adsorption, as Porter and Porter report in the literature on adsorption behavior on microfilters in the presence of cations [73]. The deprotonation of E1, E2, EE2 and E3 is governed by the dissociation of the hydroxyl group attached to the benzene ring.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

et al. 2021

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This study focuses on the adsorption kinetics of four highly potent sex hormones (estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), and estriol (E3)), present in water reservoirs, which are considered a major cause of fish feminization, low sperm count in males, breast and ovarian cancer in females induced by hormonal imbalance. Herein, electrospun polymeric nanostructures were produced from cellulose acetate, polyamide, polyethersulfone, polyurethanes (918 and elastollan), and polyacrylonitrile (PAN) to simultaneously adsorbing these estrogenic hormones in a single step process and to compare their performance. These nanofibers possessed an average fiber diameter in the range 174–330 nm and their specific surface area ranged between 10.2 and 20.9 m2 g−1. The adsorption–desorption process was investigated in four cycles to determine the effective reusability of the adsorption systems. A one-step high-performance liquid chromatography technique was developed to detect and quantify concurrently each hormone present in the solution. Experimental data were obtained to determine the adsorption kinetics by applying pseudo-first-order, pseudo-second-order and intraparticle diffusion models. Findings showed that E1, E2 and EE2 best fitted pseudo-second-order kinetics, while E3 followed pseudo-first-order kinetics. It was found that polyurethane Elastollan nanofibers had maximum adsorption capacities of 0.801, 0.590, 0.736 and 0.382 mg g−1 for E1, E2, EE2 and E3, respectively. In addition, the results revealed that polyurethane Elastollan nanofibers had the highest percentage efficiency of estrogens removal at ∼58.9% due to its strong hydrogen bonding with estrogenic hormones, while the least removal efficiency for PAN at ∼35.1%. Consecutive adsorption–desorption cycles demonstrated that polyurethane maintained the best efficiency, even after being repeatedly used four times compared to the other polymers. Overall, the findings indicate that all the studied nanostructures have the potential to be effective adsorbents for concurrently eradicating such estrogens from the environment.

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Section: Adsorption Mechanismmentioning

confidence: 99%

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

et al. 2021

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“…The kinetic models parameters with each EH using WCENFs (Porter and Porter 1995). The deprotonation of E1, E2, EE2, and E3 is governed by the hydroxyl group's dissociation attached to the benzene ring.…”

Section: Tablementioning

confidence: 99%

“…(8), ( 9), ( 10), (11), and ( 12) are shown in Table 5. (Porter and Porter 1995). The deprotonation of E1, E2, EE2, and E3 is governed by the hydroxyl group's dissociation attached to the benzene ring.…”

Section: ) 572mentioning

confidence: 99%

Adsorption of Estrogenic Hormones in Aqueous Solution Using Electrospun Nanofibers From Waste Cigarette Butts: Kinetics, Mechanism, and Reusability

Yasir

Šopík

Patwa

et al. 2021

Preprint

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This study emphasizes rapid and simultaneous adsorptive removal of estrogenic hormones (EHs): estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), and estriol (E3) from wastewater using recycled waste cigarette electrospun nanofibers (WCENFs). The nanofibers exhibited a small diameter (196±65 nm) and large surface area (18.05 m 2 /g), along with a strong affinity towards all EHs by adsorption due to abundant hydrogen bonding interactions. A one-step high-performance liquid chromatography technique was developed to detect each EH present in the solution simultaneously. The adsorption kinetics helps select optimum conditions for the large-scale removal process, so experimental data using pseudo-first-order, pseudo-second-order, intra-particle diffusion, Elovich, and fractional power models were fitted. It was found that E1, E2, and EE2 followed pseudo-second-order kinetics while E3 followed pseudo-first-order kinetic models. The total adsorption capacity on WCENFs was determined to be 2.14 mg/g, whereas the individual adsorption capacities of E1, E2, EE2, and E3 were found to be 0.551, 0.532, 0.687, and 0.369 mg/g, respectively. The percentage efficiency of WCENFs was highest with EE2 ~64.3% and least with E3 ~34.6%. Adsorption-desorption studies revealed that WCENFs could repeatedly be used four times. The reported results indicate a significant potential of WCENFs to be an effective sorbent and portable filter for simultaneous estrogenic hormone removal. WCENFs filter is a suitable alternative to commercial Cellulose acetate filters.

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“…Several investigations have been carried out on the treatment of the dye effluents using microfiltration [13,14], ultrafiltration [15][16][17], nanofiltration [18][19][20] and reverse osmosis membranes [21][22][23]. Microfiltration is suitable for removing colloidal dyes from the exhausted dye bath and the subsequent rinses.…”

Section: Introductionmentioning

confidence: 99%

Comparison between nanofiltration and forward osmosis in the treatment of dye solutions

Ammar

Dofan

Jegatheesan

et al. 2015

Desalination and Water Treatment

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A B S T R A C TColour removal and the flux behaviour of nanofiltration (NF-DOW FILMTEC-NF245) and forward osmosis (FO-a flat sheet cellulose triacetate membrane with a woven embedded backing support) membranes were investigated in this study. The NF membrane was employed to perform dye removal experiments with aqueous solutions containing 15 g/L of NaCl and different concentrations of Acid Green 25, Remazol Brilliant Orange FR and Remazol Blue BR dyes. The increase in dye concentration resulted in a decline in water permeability and an increase in colour removal. When the concentrations of dye solutions varied from 250 to 1000 mg/L, at 0.8 bar of trans-membrane pressure, the NF system exhibited a steady permeate flux of more 30 L/m 2 h and a colour removal of more than 99%; salt rejection was more than 20.0%. Furthermore, the FO system possessed high dye rejection efficiency (almost 100%), with low permeate flux of around 2.0 L/m 2 h, when using dye solutions as feed streams and seawater as draw stream. The mode of operation (either FO or pressure retarded osmosis (PRO)) did not change the flux significantly but PRO mode always produced higher fluxes than FO mode under the operating conditions used in this study. While both NF and FO can be used to reduce the volume of effluent containing dyes from textile industries, the energy spent in NF on applied pressure can be substituted by the osmotic pressure of draw solution in FO when concentrated draw solutions such as sea water or reverse osmosis concentrate are readily available.

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Filtration studies of selected anionic dyes using asymmetric titanium dioxide membranes on porous stainless-steel tubes

Cited by 22 publications

References 3 publications

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

The adsorption, kinetics, and interaction mechanisms of various types of estrogen on electrospun polymeric nanofiber membranes

Adsorption of Estrogenic Hormones in Aqueous Solution Using Electrospun Nanofibers From Waste Cigarette Butts: Kinetics, Mechanism, and Reusability

Comparison between nanofiltration and forward osmosis in the treatment of dye solutions

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