Cost effective biochar gels with super capabilities for heavy metal removal

Chen, Pan-pan; Zhang, Hongping; Liu, Huan-de; Luo, Xin; Lin, Xiaoyan; Li, Xiong; Tang, Youhong

doi:10.1039/c6ra10692g

Cited by 7 publications

(5 citation statements)

References 40 publications

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“…This peak shift of about 0.34 eV was likely to be caused by the binding of lead ions onto the oxygen atoms and thus reduced its electron density . These results illustrated that new material species, which may be Pb–O, were formed in PCGt–Pb . Furthermore, the −NH 2 and −NH– were involved in the chemical adsorption of Pb(II), as confirmed by the shift varying from 399.8 to 400.1 eV.…”

Section: Resultsmentioning

confidence: 73%

“…In Figure b, the characteristic peak appearing at 138.53 eV was attributed to Pb 4f 7/2 , which represented the bonding between Pb(II) and carboxylate groups. Another peak appearing at 143.65 eV was due to Pb 4f 5/2 , which represented the fixation of lead onto the composite . In Figure c, the chemical assignment of the C 1s region at around 284.7, 286.1, and 287.4 eV was due to C–C/C–H, C–O/C–N, and N–CO/O–CO, respectively.…”

Section: Resultsmentioning

confidence: 94%

“…Another peak appearing at 143.65 eV was due to Pb 4f 5/2 , which represented the fixation of lead onto the composite. 43 In Figure 6c, the chemical assignment of the C 1s region at around 284.7, 286.1, and 287.4 eV was due to C−C/C−H, 44 C−O/C−N, 45 and N− CO/O−CO, 46 respectively. In Figure 6d, the peaks centered at 398.4 and 399.8 eV were respectively corresponding to the nitrogen in N− and −NH−/−NH 2 47,48 which also clearly confirmed the induction of PEI and the covalent interaction, i.e., amide bond formation.…”

Section: Resultsmentioning

confidence: 96%

“…7 These results illustrated that new material species, which may be Pb− O, were formed in PCGt−Pb. 43…”

Section: Resultsmentioning

confidence: 99%

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PEI-Modified CMKGM/GO Porous Biocomposite for Superior Removal of Pb(II)

Cao

Shen

2019

J. Chem. Eng. Data

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Using polyethylenimine-modified carboxylmethyl konjac glucomannan as a matrix and graphene oxide as nanofillers, a novel porous biocomposite named as PCGt was synthesized by a facile chemical cross-linking method. The structure of prepared PCGt was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy. Batch adsorption experiments was designed to exploit key factors on Pb(II) removal such as the pH, dose, contact time, initial concentration, and temperature. According to the data from pseudo-second-order kinetic and Freundlich isotherm models, the adsorption process was controlled by chemisorption and occurred on heterogeneous surfaces. The maximum adsorption capacity of PCGt on Pb(II) was up to 977 mg g −1 at 303.15 K. In thermodynamic analysis, positive enthalpy change and negative Gibbs free energy change exposed that the adsorption was endothermic and spontaneous at 308.15 K. The recyclability of PCGt was confirmed by leaching and desorption experiments. The adsorption mechanism was proposed that the chemical complexation between Pb(II) with the functional groups on PCGt. All outcomes effectively revealed that the biocomposite PCGt was a good candidate to remove Pb(II) from aqueous solution for the waste disposal industry.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 96%

“…7 These results illustrated that new material species, which may be Pb− O, were formed in PCGt−Pb. 43…”

Section: Resultsmentioning

confidence: 99%

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PEI-Modified CMKGM/GO Porous Biocomposite for Superior Removal of Pb(II)

Cao

Shen

2019

J. Chem. Eng. Data

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“…The negative values of ΔH 0 confirm the exothermic nature of the adsorption of both metal ions onto the prepared adsorbent in single metal systems at 298-323 K [46,47], which is supported by the results of the temperature effect on the adsorption processes. Negative values of ΔS 0 reflected that the randomness decreases at the MONPs-EG and solution interface during the adsorption of metal ions [48,49]. The higher magnitude of ΔS 0 obtained in the Pb 2+ system signified that it had a better affinity toward and was more stable on the MONPs-EG compared to Ni 2+ .…”

Section: Thermodynamic Studymentioning

confidence: 99%

Adsorption of Lead and Nickel on to Expanded Graphite Decorated with Manganese Oxide Nanoparticles

et al. 2019

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In this study, expanded graphite (EG) was decorated with manganese oxide nanoparticles (MONPs) by the hydrothermal method, and the newly formed composite (MONPs-EG) was applied as adsorbent for the removal of heavy metals from aqueous solutions. The comparative and competitive adsorption of Pb2+ and Ni2+ (0.01–1.00 mM) on MONPs-EG was investigated. Data from isothermal adsorption of single and binary systems suggested that both Pb2+ and Ni2+ were well described by the Langmuir isotherm, and the maximum adsorption capacities at 298 K were calculated at 0.278 and 0.113 mmol/g for Pb2+ and Ni2+, respectively. In binary systems, a dramatic decrease in adsorption capacity of Ni2+ was observed, while the adsorption capacity of Pb2+ was almost stable, indicating the favorable adsorption of Pb2+ over Ni2+ onto the prepared adsorbent. Kinetics studies of single and binary systems showed that a pseudo-second order model could explain the adsorption processes well. Thermodynamic analysis results demonstrated that the adsorption of these metal ions on the prepared adsorbent is spontaneous and exothermic in nature. The adsorption capacity of MONPs-EG increased significantly in the presence of humic acids. Overall, the results of this study suggest that MONPs-EG can be used effectively as an adsorbent for heavy metals removal from aqueous solutions.

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