Carbon monolith with embedded mesopores and nanoparticles as a novel adsorbent for water treatment

Chen, Long; Wang, Huaiyuan; Wei, Huige; Guo, Zhanhu; Khan, Mojammel A.; Young, David P.; Zhu, Jiahua

doi:10.1039/c5ra03014e

Cited by 17 publications

(11 citation statements)

References 53 publications

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“…It is worth mentioning that only ∼11% of the surface area is composed of external surface in CF, while the external surface percentage increases gradually with increasing Ni nanoparticle loading and reaches up to 40% in CF-Ni10. The mesopore generation is supported and explained in our previous work . The formation of larger mesopores is further evidenced by the upshift of the BJH pore size distribution curves in the large pore size range, Figure , parts c and d. As expected, the average pore size and pore volume increase simultaneously with increasing Ni loading due to the larger portion of mesopores in the composites.…”

Section: Resultssupporting

confidence: 84%

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Boosting Energy Efficiency of Nickel Cobaltite via Interfacial Engineering in Hierarchical Supercapacitor Electrode

Chen

et al. 2016

J. Phys. Chem. C

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Hybrid electrodes with electroactive components on conductive substrates have been demonstrated to be an effective strategy to achieve high energy and power density in supercapacitors. However, the mismatch of interface property could be a huge hurdle to further improve energy storage performance and long-term stability. In this work, an interfacial metal seeding approach has been developed targeting strengthening of the interfacial interaction between electroactive NiCo2O4 nanostructure and carbon substrate as well as to promote electron transfer across the interface. By implanting low-concentration nickel (Ni) nanoparticles at the interface, the electrochemical capacitance of NiCo2O4 was boosted up to 2367 F/g at a current density of 1 A/g in a symmetric two-electrode configuration, which is about 2 times higher than the capacitance obtained from the electrode without metal seeds. The Ni seeds also contribute to an excellent cycling retention of >96% after 5000 cycles, where only 65% capacitance was retained in the electrode without Ni seeds. A synergistic contribution of promoted interfacial interaction, reduced internal resistance, enlarged surface area, and mesoporous NiCo2O4 nanorod structure leads to a boosted energy efficiency of NiCo2O4 in this study. A comparative study on different metal nanoparticles (nickel, cobalt, and iron) reveals that not only metal species but also particle concentration play significant roles in determining the energy storage property of the hierarchical NiCo2O4/carbon electrodes.

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Section: Resultssupporting

confidence: 84%

“…After embedding Ni nanoparticles, a sharp peak at 2θ = 26.4° is observed implying the formation of graphitic carbon (002) (PDF no. 41-1487) . Meanwhile, two additional peaks that appeared at 2θ = 44.6° and 52.0° are indexed to (111) and (200) crystal planes of face-centered cubic (fcc) nickel (PDF no.…”

Section: Resultsmentioning

confidence: 99%

Boosting Energy Efficiency of Nickel Cobaltite via Interfacial Engineering in Hierarchical Supercapacitor Electrode

Chen

et al. 2016

J. Phys. Chem. C

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“…Previous research showed the efficiency of air-stable iron/carbon (Fe/C) nanomaterials in the removal of heavy metal ions and chlorinated hydrocarbons from water [ 17 , 18 , 19 , 20 ]. Such combinations of Fe nanoparticles with the advantages of carbon materials [ 21 ], e.g., porous structure and large surface area [ 22 , 23 ], may hold a great potential for adsorptive-reactive water treatment processes [ 18 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Engineering of Iron-Based Magnetic Activated Carbon Fabrics for Environmental Remediation

et al. 2015

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Magnetic Fe3O4, Fe and Fe/Pd nanoparticles embedded within the pores of activated carbon fabrics (ACF) were prepared by impregnation of the ACF in iron acetylacetanoate (Fe(acac)3) ethanol solution, followed by thermal decomposition of the embedded iron precursor at 200, 400 and 600 °C in an inert atmosphere. The effect of the annealing temperature on the chemical composition, shape, crystallinity, surface area, pore volume, and magnetic properties of the various functionalized ACF was elucidated. The Fe nanoparticles within the ACF were also doped with tinier Pd nanoparticles, by impregnation of the Fe/ACF in palladium acetate ethanol solution. The potential use of the functionalized ACF for removal of a model azo-dye, orange II, was demonstrated. This study illustrated the enhanced removal of the dye from an aqueous solution according to the following order: Fe/Pd/ACF > Fe/ACF > ACF. In addition, the enhanced activity of Fe3O4/ACF in the presence of increasing concentrations of H2O2 (Fenton catalysts) was also illustrated.

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“…After thermal oxidation, the quantity of adsorbed N 2 increased significantly at low relative pressure, which indicated the increased microporous surface area. Moreover, hysteresis loops were observed in oxidized samples confirming the formation of mesopores (Chen et al, 2015c). In general, thermal oxidation increased both the mesoporous and microporous surface area.…”

Section: Pore Structurementioning

confidence: 73%

Pore size dependent molecular adsorption of cationic dye in biomass derived hierarchically porous carbon

Chen

et al. 2017

Journal of Environmental Management

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Hierarchically porous carbon adsorbents were successfully fabricated from different biomass resources (softwood, hardwood, bamboo and cotton) by a facile two-step process, i.e. carbonization in nitrogen and thermal oxidation in air. Without involving any toxic/corrosive chemicals, large surface area of up to 890 m/g was achieved, which is comparable to commercial activated carbon. The porous carbons with various surface area and pore size were used as adsorbents to investigate the pore size dependent adsorption phenomenon. Based on the density functional theory, effective (E-SSA) and ineffective surface area (InE-SSA) was calculated considering the geometry of used probing adsorbate. It was demonstrated that the adsorption capacity strongly depends on E-SSA instead of total surface area. Moreover, a regression model was developed to quantify the adsorption capacities contributed from E-SSA and InE-SSA, respectively. The applicability of this model has been verified by satisfactory prediction results on porous carbons prepared in this work as well as commercial activated carbon. Revealing the pore size dependent adsorption behavior in these biomass derived porous carbon adsorbents will help to design more effective materials (either from biomass or other carbon resources) targeting to specific adsorption applications.

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Carbon monolith with embedded mesopores and nanoparticles as a novel adsorbent for water treatment

Cited by 17 publications

References 53 publications

Boosting Energy Efficiency of Nickel Cobaltite via Interfacial Engineering in Hierarchical Supercapacitor Electrode

Boosting Energy Efficiency of Nickel Cobaltite via Interfacial Engineering in Hierarchical Supercapacitor Electrode

Engineering of Iron-Based Magnetic Activated Carbon Fabrics for Environmental Remediation

Pore size dependent molecular adsorption of cationic dye in biomass derived hierarchically porous carbon

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