Remediation of Cu(II), Ni(II), and Cr(III) ions from simulated wastewater by dendrimer/titania composites

Barakat, M.A.; Ramadan, Mohamed H.; Alghamdi, Mansour A.; Algarny, S.S.; Woodcock, H. Lee; Kuhn, John N.

doi:10.1016/j.jenvman.2012.12.025

Cited by 83 publications

(33 citation statements)

References 49 publications

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“…Dendrimer/titania composite materials prepared by the effective immobilization of dendrimers onto titania could improve metal ion removal from industrial wastewater. 38 The GO-PAMAMs were prepared via a "grafting-from" strategy by Yang Yuan et al 39 The total adsorption capacity of these heavy metal ions can reach 1.0007 mmol/g. In the present study, GO was modified by PAMAMs via a "graftingto" method.…”

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confidence: 99%

Preparation of Graphene-Oxide/Polyamidoamine Dendrimers and Their Adsorption Properties toward Some Heavy Metal Ions

et al. 2014

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Graphene oxide/polyamidoamine dendrimers (GO/PAMAMs) were prepared via a "grafting to" method. The adsorption behavior of the GO/ PAMAMs for Pb(II), Cd(II), Cu(II), and Mn(II) was studied, and the effects of solution pH, adsorption time, and initial metal ion concentration on adsorption capacity of the adsorbent were also investigated. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetic processes, and the results indicated that the adsorption of Pb(II), Cd(II), Cu(II), and Mn(II) followed a second-order type reaction kinetics and the adsorption of Pb(II), Cd(II), Cu(II), and Mn(II) onto GO/PAMAMs is a chemical adsorption. The adsorption capacities of GO/PAMAMs were found to be 568.18, 253.81, 68.68, and 18.29 mg/g for Pb(II), Cd(II), Cu(II), and Mn(II), respectively. The adsorption reached equilibrium within 60 min and characteristics of the adsorption process were evaluated by using the Langmuir and Freundlich isotherm models. The adsorption processes fit better with the Langmuir model for Cu(II) and Mn(II) than for Pb(II) and Cd(II); the adsorption of Cu(II) and Mn(II) on GO/PAMAMs was a typical monomolecular layer adsorption. ■ INTRODUCTIONThere are plenty of mineral resources in Western Hunan in China; however, a lot of wastewater and waste residue containing heavy metal ions affect sustainable exploitation and utilization of the mineral resources. Water pollution by heavy metal ions has become an urgent problem to be solved.Adsorptive removal of heavy metal ions has been widely applied using such materials as activated carbon, 1−4 multiwalled carbon nanotubes, 5−8 zeolites, 9−12 chitosan, 13−20 metal oxide, 21,22 polymer absorbents, 23 and agricultural byproducts. 24,25 Recently, some effective adsorbents based on graphene and graphene composites were made and applied in removing heavy metal ions. 26−34 For example, the polypyrrole− reduce graphene oxide composite showed a highly selective removal capacity with a high Hg 2+ adsorption capacity of 980 mg·g −1 and an extremely high desorption rate of up to 92.3 %, showing practical utility for wastewater treatment. 26 Graphene oxide (GO) aerogels prepared by a unidirectional freeze-drying method were used as an effective adsorbent for Cu 2+ removal from water. 28 Deng et al. found that the functionalized graphene could be fabricated by a simple and fast method of electrolysis with potassium hexafluorophosphate solution as electrolyte under the static potential of 15 V; the adsorption processes reached equilibrium in just 40 min and the adsorption isotherms were described well by Langmuir and Freundlich classical isotherms models. 33 Polyamidoamine dendrimers (PAMAMs) are highly reactive because of the presence of a large amount of terminal functional groups. 35,36 Mamadou et al. 37 found that the Cu(II) binding capacities of the EDA core PAMAM dendrimers were much larger and more sensitive to solution pH than those of linear polymers with amino groups, and the metal ion laden dendrimers can be regenerated by decreas...

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Preparation of Graphene-Oxide/Polyamidoamine Dendrimers and Their Adsorption Properties toward Some Heavy Metal Ions

et al. 2014

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“…The complete synthesis of the dendrimer/titania composite was described in an earlier publication (Barakat et al 2013). Infrared (FTIR) spectra of fresh and used composites were acquired with a PerkinElmer Spectrum 100 FTIR Spectrometer.…”

Section: Batch Metal Ion Remediation Studies Monitored By Uv-vis Specmentioning

confidence: 99%

“…As part of a larger study (Barakat et al 2013), the removal of Ni 2? ions was examined as a function of pH using the composite materials (highlighted in Fig.…”

Section: Batch Metal Ion Remediation Studies By Immobilized Dendrimersmentioning

confidence: 99%

“…Another focus of this effect is to assess dendrimer immobilization by metal oxides, a method to improve separation and reuse of the material, on the adsorption rate. Titania-immobilized dendrimers were recently surveyed (Barakat et al 2013) for the removal of metal ions typically generated from the electroplating industry. Consequently, dendrimers were immobilized onto titania and applied toward Ni 2?…”

Section: Introductionmentioning

confidence: 99%

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Metal ion remediation by polyamidoamine dendrimers: a comparison of metal ion, oxidation state, and titania immobilization

Castillo

Barakat

Ramadan

et al. 2013

Int. J. Environ. Sci. Technol.

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The exceptional ability of dendrimers to coordinate metal ions yields the potential for many applications including wastewater remediation, which is the focus of this study. Here, the comparison of metal ion removal rate from simulated wastewater by generation 4 dendrimers with external hydroxyl functional groups (G4-OH) is evaluated for Ni 2? , Fe 2? , and Fe 3? ions. Ni 2? to amine complexation occurred more rapidly than Fe 3? , which was more rapid than Fe 2? complexation. These results indicate that both charge density and d-electron configuration are important toward the chelation rate. The impact of both factors is discussed in light of existing models in which precursor aquation rates have been proposed as a key intermediate step. Additionally, the application of the dendrimers as chelation agents is further advanced by immobilizing the dendrimer to titania and re-evaluating its chelation ability for Ni 2? removal. The dendrimer immobilization decreased the pseudo-first-order rate coefficient for Ni 2? -amine complexation at a pH of 7 by a factor of 7.5. This result is significant as it suggests that mass transfer becomes important following immobilization of the dendrimer to titania.

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“…Particularly, aqueous heavy metal solutions treated with PAMAM previous to pass them through a membrane (ultrafiltration technique) has been proposed for water and soil remediation [23][24][25][26][27]. Other researchers have obtained functionalized membranes with PAMAM, hydroxyl PAMAM and carboxyl PAMAM for CO 2 /N 2 separation and as models for adsorption of dye molecules [28][29][30][31]. Recently, raw PAMAM, aromatic PAMAM and PAMAM coated with polyethylene glycol have been used in the modification of polymeric reverse osmosis membranes for Ba 2+ , Na + and As 3+ recovery [32][33][34] and other contributions on dendrimers immobilization have also been proposed [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Characterization of an engineered cellulose based membrane by thiol dendrimer for heavy metals removal

Algarra¹,

Vázquez²,

Alonso³

et al. 2014

Chemical Engineering Journal

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Remediation of Cu(II), Ni(II), and Cr(III) ions from simulated wastewater by dendrimer/titania composites

Cited by 83 publications

References 49 publications

Preparation of Graphene-Oxide/Polyamidoamine Dendrimers and Their Adsorption Properties toward Some Heavy Metal Ions

Preparation of Graphene-Oxide/Polyamidoamine Dendrimers and Their Adsorption Properties toward Some Heavy Metal Ions

Metal ion remediation by polyamidoamine dendrimers: a comparison of metal ion, oxidation state, and titania immobilization

Characterization of an engineered cellulose based membrane by thiol dendrimer for heavy metals removal

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