Employment of polyurethane foam for the adsorption of Methylene Blue in aqueous medium

Baldez, Eliene E.; Robaina, Nicolle F.; Cassella, Ricardo J.

doi:10.1016/j.jhazmat.2008.02.055

Cited by 113 publications

(45 citation statements)

References 40 publications

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“…This test was performed taking into account that the MG adsorption is dependent of the formation of an ionic pair between the cationic dye and the anionic SDS. This phenomenon was already reported in other works related to the adsorption of cationic dyes by the PUF (Baldez et al 2008(Baldez et al , 2009). The present study was carried out by maintaining the concentration of the MG constant at 2.5×10 −5 mol L −1 and varying the concentration of the SDS in the range of 0-1.75×10 −4 mol L −1 .…”

Section: Effect Of the Sds Concentrationsupporting

confidence: 83%

Removal of Malachite Green from Aqueous Medium Employing Polyurethane Foam as Adsorbent and Sodium Dodecylsulfate as Carrier

Leite

Robaina

Reis

et al. 2011

Water Air Soil Pollut

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The present work describes a detailed study about the adsorption of malachite green (MG) by a polyether-type polyurethane foam (PUF) using sodium dodecylsulfate (SDS) as a carrier. The adsorption process was based on the formation of a hydrophobic ionic-pair between the MG cationic dye and the dodecylsulfate anion, which presented high affinity for the PUF. The manifold employed in the study was built up by adjusting a cylinder of PUF with 200 mg in the arm of an overhead stirrer, which was soaked (and stirred) in the solution containing the dye and SDS. The adsorption process was characterized in relation to equilibrium and kinetic aspects. Langmuir (r 2 =0.842) and Freundlich (r 2 =0.996) isotherms were also employed for modeling the system as well as the Nernst partition law (r 2 =0.999). A study about the recovery of MG and the PUF regeneration was conducted, and the acetonitrile was the most efficient solvent for the desorption of the adsorbed ionic pair. The obtained results showed that the concentration of SDS added to the medium plays an important role on the adsorption process, which can be better described by employing a second-order kinetic model.

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Section: Effect Of the Sds Concentrationsupporting

confidence: 83%

Removal of Malachite Green from Aqueous Medium Employing Polyurethane Foam as Adsorbent and Sodium Dodecylsulfate as Carrier

Leite

Robaina

Reis

et al. 2011

Water Air Soil Pollut

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“…This could be due to the presence of polar and non-polar functional groups in the structure of sponge material (Baldez et al, 2008). Moreover, the sorption of micropollutants onto sponge occurred promptly and reached the equilibrium within 2 hours.…”

Section: Tablementioning

confidence: 99%

Removal and fate of micropollutants in a sponge-based moving bed bioreactor

Luo

Guo

Ngo

et al. 2014

Bioresource Technology

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This study investigated the removal of micropollutants using polyurethane sponge as attached-growth carrier. Batch experiments demonstrated that micropollutants could adsorb to non-acclimatized sponge cubes to varying extents. Acclimatized sponge showed significantly enhanced removal of some less hydrophobic compounds (logD < 2.5), such as ibuprofen, acetaminophen, naproxen, and estriol, as compared with nonacclimatized sponge. The results for bench-scale sponge-based moving bed bioreactor (MBBR) system elucidated compound-specific variation in removal, ranging from 25.9% (carbamazepine) to 96.8% (bEstradiol 17-acetate) on average. In the MBBR system, biodegradation served as a major removal pathway for most compounds. However, sorption to sludge phase was also a notable removal mechanism of some persistent micropollutants. Particularly, carbamazepine, ketoprofen and pentachlorophenol were found at high concentrations (7.87, 6.05 and 5.55 lg/g, respectively) on suspended biosolids. As a whole, the effectiveness of MBBR for micropollutant removal was comparable with those of activated sludge processes and MBRs. AbstractThis study investigated the removal of micropollutants using polyurethane sponge as attached-growth carrier. Batch experiments demonstrated that micropollutants could adsorb to non-acclimatized sponge cubes to varying extents. Acclimatized sponge showed significantly enhanced removal of some less hydrophobic compounds (log D < 2.5), such as ibuprofen, acetaminophen, naproxen, and estriol, as compared with nonacclimatized sponge. The results for bench-scale sponge-based moving bed bioreactor (MBBR) system elucidated compound-specific variation in removal, ranging from 25.9%(carbamazepine) to 96.8% (β-Estradiol 17-acetate) on average. In the MBBR system, biodegradation served as a major removal pathway for most compounds. However, sorption to sludge phase was also a notable removal mechanism of some persistent micropollutants. Particularly, carbamazepine, ketoprofen and pentachlorophenol were 2 found at high concentrations (7.87, 6.05 and 5.55 µg/g, respectively) on suspended biosolids. As a whole, the effectiveness of MBBR for micropollutant removal was comparable with those of activated sludge processes and MBRs.

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“…Ossman, Professor, Petrochemical Engineering Department, Pharos University, Alexandria, Egypt M. Abdelfattah, Petrochemical Engineering Department, Pharos University, Alexandria, Egypt wastewater e.g. polyurethane [12][13][14][15][16] organo bentonite [17], carbon [18], Zn2Al-NO3 [19] and miswak [20]. Polyurethane foam (PF) is a good sorbent to remove some organic and inorganic pollutants from wastewater [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Polyurethane (PU) foams have been used as adsorbents in the treatment of contaminated water and effluent because they are cheap, a high surface area because of their open porous structures and thus can be used as matrices to immobilize various adsorbents and can be used without prior treatment [23]. PU foams are able to retain different classes of substances because of the presence of both polar and nonpolar groups in their structures [14][15][16][17][18][19][20][21][22][23]. The high basisty of PF decreases sorption capacity of PF.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane Composites for Dye and Heavy Metal Removal: (Adsorption Kinetics and Isotherms Studies)

2018

ICASET-18,ACBES-1,EEHIS-18 June 20-21, 2018 Paris (France)

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Abstract-The need to maintain a cleaner environment for the survival of both aquatic and terrestrial lives including human beings is very crucial and is a subject of increasing concern to the environmentalist. Pollution caused by agents such as heavy metals and organic pollutants are amongst the list which rendered the environment unwholesome and posed serious health concern to the populace. The removal of Heavy metals and organic pollutants from wastewater before their discharge in the environmental is very important due to its polluting effect on the underground water. This work dealt with the preparation and characterization of polyurethane foam composite with bentonite and CuO and the usage of these adsorbents in removing Eosin dye (as an organic pollutants) and Cd (heavy metal) from industrial wastewater using a batch operation system. Studying of the operating conditions namely; effects of contact time, dosage of adsorbent, initial concentration as well as effect of pH were carried out. Also kinetics and isotherm study that describe the adsorption process are carried out.

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Employment of polyurethane foam for the adsorption of Methylene Blue in aqueous medium

Cited by 113 publications

References 40 publications

Removal of Malachite Green from Aqueous Medium Employing Polyurethane Foam as Adsorbent and Sodium Dodecylsulfate as Carrier

Removal of Malachite Green from Aqueous Medium Employing Polyurethane Foam as Adsorbent and Sodium Dodecylsulfate as Carrier

Removal and fate of micropollutants in a sponge-based moving bed bioreactor

Polyurethane Composites for Dye and Heavy Metal Removal: (Adsorption Kinetics and Isotherms Studies)

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