Adsorption of Cu(II) and Cd(II) from aqueous solutions by ferromanganese binary oxide–biochar composites

Zhou, Qiwen; Liao, Bo-Han; Lin, Lina; Qiu, Weiwen; Song, Zhengguo

doi:10.1016/j.scitotenv.2017.09.220

Cited by 334 publications

(76 citation statements)

References 45 publications

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“…On the other hand, adsorption of Cu(II) on the OCF is an exothermic process (ΔH° = -22.3 kJ mol -1 , ΔS° = 2.0 J mol -1 K -1 , R = 0.95). Generally, the values of the thermodynamic parameters evaluated are close to corresponding values reported in the literature for similar systems [6,[21][22][23][24][25][26][27][28][29].…”

Section: Effect Of Temperature On the Adsorption Efficiencysupporting

confidence: 83%

“…The q max value of the composite material shows that chemical modification of the material improves its adsorption attributes, and that biochar fiber-MnO 2 composites can be used as an alternative for MnO 2 resins [19]. Moreover, the q max value determined for the biochar fiber-MnO 2 composite is significantly higher than corresponding values (q max < 3 mol kg -1 ) reported in literature for the adsorption of Cu(II) by MnO 2 -biochar composites [21][22][23][24][25]. This increased adsorption capacity of the material studied here is attributed to both, the nano-sized MnO 2 -particles and high external surface of the biochar fibers [13,14].…”

Section: Effect Of Cu(ii) Concentrationmentioning

confidence: 62%

“…According to Fig. 9, which shows the relative amount of adsorbed Cu(II) as a function of time, the adsorption of Cu(II) by the two different biochar materials is a two-step process with a relatively first fast step which could not be followed by the potentiometric method and a second slow process related to the diffusion of the Cu(II) ions within the fiber channels/ tubules [21][22][23][24][25].…”

Section: Kinetic Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Copper(II) adsorption by Opuntia ficus-indica biochar fiber–MnO2 composites

Hadjiyiannis¹,

Pashalidis²

2019

Desalination and Water Treatment

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a b s t r a c tThe adsorption efficiency of biochar fibers obtained from Opuntia ficus-indica cactus regarding the removal of Cu(II) ions from aqueous solutions has been investigated prior and after MnO 2 surfacedeposition. The removal efficiency has been studied as a function of pH, Cu(II) concentration, ionic strength, temperature and contact time. In addition, the biochar fibers have been characterized by Fourier transform infrared spectroscopy studies to elucidate the adsorption mechanism. Evaluation of the experimental data indicated that the MnO 2 -composite product presents higher adsorption capacity, which is attributed to the formation of inner-sphere surface complexes, and that the adsorption reaction is a relatively fast and endothermic process. The results of the present study reveal that MnO 2 -biochar composites could be used as very effective adsorbents for the removal of bivalent metal-ions from contaminated waters.

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Section: Effect Of Temperature On the Adsorption Efficiencysupporting

confidence: 83%

Section: Effect Of Cu(ii) Concentrationmentioning

confidence: 62%

Section: Kinetic Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Copper(II) adsorption by Opuntia ficus-indica biochar fiber–MnO2 composites

Hadjiyiannis¹,

Pashalidis²

2019

Desalination and Water Treatment

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“…As shown in Fig. 8b, the Cd(II) peaks located at 406.6 and 405.6 eV, which basically correspond to the peak value for Cd 3 d 5 in the literature, 44 indicate that the chemical valence of Cd does not change during the adsorption process and no redox reaction occurs; that is, Cd(II) on the surface of Fe/SA-C is present in the form of Cd(OH) 2 and CdO. Therefore, it can be concluded that the deposition and chelation of Cd(II) plays a signicant role in the adsorption process.…”

Section: Sorption Mechanismsupporting

confidence: 80%

“…The metal-loaded carbon composite material not only has an excellent porous structure, thermodynamic stability and controllable chemical properties, but also a wider range of application than the single-carbon material. 11 Aluminum, zirconium and other particles or their oxide particles are always considered to be appropriate materials for loading. [12][13][14] For example, Al 2 O 3 /C composite, with an innovative and complicated preparation, was used to remove Pb(II) and Cd(II).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of divalent cadmium by calcified iron-embedded carbon beads

Cheng

Wang

et al. 2020

RSC Adv.

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A novel iron-embedded carbon bead was prepared by the calcination of a calcium alginate gel bead mixed with iron nanoparticles coated by polydopamine. The prepared iron-embedded carbon bead was characterized by infrared spectrum analysis, X-ray diffraction, Raman spectroscopy, vibrating sample magnetometry, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. It was discovered that the novel structure efficaciously prevented the agglomeration of iron nanoparticles. Additionally, the effects of dose, pH, exposure time, temperature and initial concentration on the adsorption of Cd(II) were studied, and the reusability of the material was analyzed. Fe/SA-C showed high Cd(II) removal capability (220.3, 225.7, 240.8 mg g À1 at 288, 298, 308 K), easy recoverability and high stability. In addition, some slightly different interpretations of the adsorption mechanism are given. This study clearly revealed that Fe/SA-C has potential application in the removal of Cd(II).

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Novel Fe₃O₄/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

Ansari

Vahedi

Tavakoli

et al. 2018

Applied Organom Chemis

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The increased global concern on environmental protection has made researchers focus their attention on new and more efficient methods of pollutant removal. In this research, novel nanocomposite adsorbents,i.e., magnetic hydroxyapatite (Fe 3 O 4 @HA) and magnetic hydroxyapatite β-cyclodextrin (Fe 3 O 4 @HA-CD) were synthesized and used for heavy metal removal. The adsorbents were characterized by FTIR, XRD, TGA, VSM, and SEM. In order to investigate the effect of β-cyclodextrin (β-CD) removal efficiency, adsorption results of nine metal ions were compared for both adsorbents. β-CD showed the most increasing effect for Cd 2+ and Cu 2+ removal, so these two ions were selected for further studies. The effect of diverse parameters including pH, contact time, initial metal ion concentration and adsorbent dosage on the adsorption process was discussed. The optimum pH was 6 and adsorption equilibrium was achieved after 1 hr. Adsorption kinetic data were well fitted by pseudo-second-order model proposing that metal ions were adsorbed via chemical reaction. Adsorption isotherm was best described by the Langmuir model, and maximum adsorption capacity for Cd 2+ and Cu 2+ was 100.00 and 66.66 (mg/g), respectively. Desorption experiment was also done, and the most efficient eluent used for desorption of metal ions was EDTA (0.001 M) with 91% and 88% of Cd 2+ and Cu 2+ release, respectively. Recyclability studies also showed a 19% decrease in the adsorption capacity of the adsorbent after five cycles of regeneration. Therefore, the synthesized adsorbents were recognized as potential candidates for heavy metal adsorption applications.

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Adsorption of Cu(II) and Cd(II) from aqueous solutions by ferromanganese binary oxide–biochar composites

Cited by 334 publications

References 45 publications

Copper(II) adsorption by Opuntia ficus-indica biochar fiber–MnO2 composites

Copper(II) adsorption by Opuntia ficus-indica biochar fiber–MnO2 composites

Adsorption of divalent cadmium by calcified iron-embedded carbon beads

Novel Fe₃O₄/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

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Adsorption of Cu(II) and Cd(II) from aqueous solutions by ferromanganese binary oxide–biochar composites

Cited by 334 publications

References 45 publications

Copper(II) adsorption by Opuntia ficus-indica biochar fiber–MnO2 composites

Copper(II) adsorption by Opuntia ficus-indica biochar fiber–MnO2 composites

Adsorption of divalent cadmium by calcified iron-embedded carbon beads

Novel Fe3O4/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

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Product

Resources

About

Novel Fe₃O₄/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution