Competitive adsorption of Cu 2+ , Cd 2+ and Ni 2+ from an aqueous solution on graphene oxide membranes

Tan, Puay Yok; Hu, Yongyou; Bi, Qi

doi:10.1016/j.colsurfa.2016.08.081

Cited by 73 publications

(41 citation statements)

References 32 publications

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“…Furthermore few-layered GO nanosheets with some wrinkles can be clearly observed on both GO and AlMg/GO TEM images (Fig. 1b, c), which are similar to other studies [19,20]. The wrinkles at the edge of GO plane are considered as high surface energy sites for pollutants adsorption [24].…”

Section: Materials Characterizationsupporting

confidence: 68%

“…In particular, graphene oxide (GO) and reduced GO (rGO) contain plenty of oxygencontaining functional groups and do not heavily aggregate in water like graphene, making them more suitable for water decontamination applications [19][20][21][22]. However, GO has weak binding affinity for anionic compounds due to the strong electrostatic repulsion [23].…”

Section: Introductionmentioning

confidence: 99%

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Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Ahmadi

Yang

Jones

et al. 2018

Adv Compos Hybrid Mater

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Separation-free Al-Mg/graphene oxide (Al-Mg/GO) composites were synthesized by facile one-pot hydrothermal treatment and examined for adsorptive removal of representative contaminants (phosphate, copper (II), and Diclofenac (DCF)) in urban stormwater runoff. The Al-Mg/GO composites exhibited good adsorption capacity for all three contaminants. The adsorption isotherm and kinetics are well described by Freundlich model and pseudo-second-order model, respectively. Further, adsorption of phosphate and DCF favored acidic conditions while an opposite trend was observed for copper (II), which can be ascribed to the change of surface charge of the composites at different pH. The presence of different ions commonly present in environmental matrices (humic acid, bicarbonate, and sulfate) exhibited different effects on the contaminants' removal. Bicarbonate inhibited phosphate and DCF adsorption but promoted copper (II) removal. Copper (II) adsorption was also increased through chemical complexation and electrostatic attraction as a result of humic acid/sulfate adsorption on the adsorbents. The adsorption mechanisms include electrostatic interaction for all three contaminants, Lewis acid-base interactions and surface complexation for phosphate, π-π interactions for DCF, and cation-π interactions for copper (II). More than 75% adsorption capacities were maintained after 4 cycles of adsorption/desorption/regeneration, indicating good reusability. The Al-Mg/GO composites show great potential as a multifunctional adsorptive material for urban stormwater management.

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Section: Materials Characterizationsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Ahmadi

Yang

Jones

et al. 2018

Adv Compos Hybrid Mater

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Generally, the constituents of an adsorbent has a great influence on the amounts of adsorption sites. [21][22]38 The removal efficiency of Pb 2+ and Cd 2+ by P(AANa-co-AM) and P(AANa-co-AM)/GO hydrogels with different ratio of AA/AM are shown in Figure 2. It can be seen that the addition of 1.0wt% GO in P(AANa-co-AM) hydrogels increased the R values of Pb 2+ and Cd 2+ obviously, particularly for that of Cd 2+ (Figure 2(a)), which may be contributed to the abundant -OH and -COOH groups on GO.…”

Section: Resultsmentioning

confidence: 99%

“…The plot of q t versus t for Pb 2+ and Cd 2+ is presented in Figure 6(b), it is easily found that the experimental data are related to two straight lines, the first sharp portion corresponded with the diffusion of adsorbate through the solution to the interface space of the adsorbent (external diffusion), the second portion represents the gradual adsorption stage, corresponding with the diffusion of adsorbate molecules inside the pore of the adsorbent (intro-particle diffusion). 5,38 The constants of intro-particle model are listed 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 20 in Table 2, the k id1 values and R 1 2 are much higher than that of k id2 and R 2 2 , which means that the external film diffusion should be the rate controlling step, 5 which is consistent with the pseudo-first order model. The effect of initial heavy metal ion concentration C 0 on the q e and R of Pb 2+ and Cd 2+ are shown in Figure 7, it can be seen that both the q e of Pb 2+ and Cd 2+ almost increased linearly with the increase of C 0 at the first stage, and then increased …”

Section: Resultsmentioning

confidence: 99%

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Fan

Shenzhen

et al. 2016

ACS Sustainable Chem. Eng.

140

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A serial of cross-linked sodium acrylate and acrylamide copolymer /graphene oxide (P(AANa-co-AM)/GO) hydrogels with different mass ratios of acrylic acid (AA) to acrylamide (AM) and different contents of N,N-methylenebisacrylamide (MBA) were prepared via dispersive polymerization.The prepared hydrogels were characterized by XRD, FT-IR, TGA, SEM, and BET in detail. The removal efficiency of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel have been improved significantly due to the addition of 1.0wt% of GO. The P(AANa-co-AM)/GO hydrogel with AA/AM=1 and 0.8 wt% of MBA has the highest removal efficiency for Pb 2+ and Cd 2+ and a suitable swelling ratio, which was selected as the adsorbent for systematic adsorption of Pb 2+ and Cd 2+ from aqueous solutions.The adsorption capacity and removal efficiency of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel were dependent on pH, initial heavy metal ion concentration and adsorbent dosage. The presence of 0.01~0.05 M Mg 2+ or Ca 2+ has obvious effect on the adsorption of Cd 2+ . The adsorption kinetics and adsorption isotherms of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel followed pseudo-first order model and the Langmuir isotherm model, respectively. The maximum adsorption capacity of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel were calculated to be 452.3 and 196.4 mg/g at 298 K, respectively. The XPS analysis revealed that the adsorption mechanism of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel was ascribed to the chelation of -COOwith Pb 2+ and the ion-exchange of -COO -Na + with Cd 2+ , respectively. The P(AANa-co-AM)/GO hydrogel possesses good reusability and excellent fixed-bed column operation performance, which suggests that the P(AANa-co-AM)/GO hydrogel can be considered as a promising adsorbent for removing heavy metal ions from practical wastewater.wastewater. Exposure to Pb 2+ or Cd 2+ can lead to health hazards such as central nervous system damage, kidney and lung damage, anemia, bone lesions and infertility problems, and even cause cancer. 1-3 Removal of heavy metal ions from wastewater has been a hot issue. Various treatment technologies have been applied for removing heavy metal ions such as chemical precipitation, 3 ion-exchange, 4 adsorption, 5,6 flocculation, 7 electrolysis, 8 electrocoagulation 9 and membrane separation, 10-12 etc.Among them, adsorption is considered as a facile and effective technique, 13,14 some adsorbents such as biosorbents, 1 active carbon, 15 inorganic minerals, 16,17 and magnetic composites 5-6,18 have been investigated for removing heavy metal ions from aqueous solution. Generally, the adsorption efficiency depends mainly on the type of adsorbents. Recently, various studies have found that hydrogel adsorbents exhibited super adsorption capacity, wide pH independence, easy regeneration and good reusability for removal of toxic metal ions and dyes from wastewater. [13][14][19][20][21][22] As a novel adsorbent, hydrogels are polymers with three dimensional (3-D) networks which can be formed via physical or chemical...

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“…Graphene oxide‐based membrane has recently become a research hotspot of membrane materials and could be applied to treat wastewater containing oils, dyes, and heavy metals . Tan et al prepared a highly ordered layered membrane (GO membrane) with comparatively large interlayer by induced directional flow method, which was used to remove Cu(II), Cd(II), and Ni(II) from wastewater. Membrane could achieve adsorption equilibrium in a relatively short time and exhibited excellent antipollution performance.…”

Section: Introductionmentioning

confidence: 99%

Bio‐inspired method to fabricate poly‐dopamine/reduced graphene oxide composite membranes for dyes and heavy metal ion removal

et al. 2017

Polymers for Advanced Techs

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Due to the narrow layer spacing, graphene oxide (GO) composite membrane usually exhibits a relatively low water flux in the process of wastewater treatment. In this study, GO was reduced to reduced graphene oxide through a bio-inspired method, which was functionalized modified by poly-dopamine (PDA). Then a series of PDA/reduced graphene oxide sheet films were prepared by vacuum filtration on the surface of cellulose acetate membrane (under the pressure of −0.1 MPa). The result indicated that the novel membranes had an excellent stability owing to the cross-link of PDA. In addition, the hydrophilicity of membrane was increased significantly after PDA modification, which presented a superior water flux than pure GO composite membrane. More importantly, as-prepared membranes were successfully applied for the removal of dyes (including Congo red, methylene blue, and rhodamine B) and heavy mental ion (Cu(II)) from simulated wastewater. This work might provide a new method for preparation and application of GO composite membranes.

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Competitive adsorption of Cu 2+ , Cd 2+ and Ni 2+ from an aqueous solution on graphene oxide membranes

Cited by 73 publications

References 32 publications

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Bio‐inspired method to fabricate poly‐dopamine/reduced graphene oxide composite membranes for dyes and heavy metal ion removal

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Competitive adsorption of Cu 2+ , Cd 2+ and Ni 2+ from an aqueous solution on graphene oxide membranes

Cited by 73 publications

References 32 publications

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb2+ and Cd2+

Bio‐inspired method to fabricate poly‐dopamine/reduced graphene oxide composite membranes for dyes and heavy metal ion removal

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Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺