N-doped porous carbon with magnetic particles formed in situ for enhanced Cr(VI) removal

Li, Yao; Zhu, Shenmin; Liu, Qinglei; Chen, Zhuo; Gu, Jiajun; Zhu, Chengling; Lu, Tao; Zhang, Di; Ma, Jun

doi:10.1016/j.watres.2012.10.056

Cited by 192 publications

(102 citation statements)

References 28 publications

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“…In order to diminish the experimental error, each experiment was performed twice using fresh solid each time. Due to the fact that adsorption velocity of Cr(VI) is high, as previously reported for different solids [7,9,11] and will be further discussed with the results of the present work, it was assumed that at the end of this period of time equilibrium was attained. In all the experiments, after adsorption, the solids were separated by filtration and the residual chromium concentration in the supernatant was determined by visible-UV spectroscopy at 540 nm using the method of 1,5 diphenylcarbazide [29].…”

Section: Chromium Adsorption Experimentssupporting

confidence: 58%

“…Adsorption is one of the most frequently used techniques [2,3], with a great number of materials being tested as adsorbents. The materials that have been studied so far include: natural or synthetic solids [4,5], clays or mixed hydroxides [6,7], metal oxides [8], natural organic matter [9], bioadsorbents (bacterium, algae and fungi) [10], advanced material such as functional polymers, organic/inorganic hybrid structures [11][12][13], etc. Among them, organic/inorganic hybrid materials based on ordered mesoporous silicas (OMS) are more useful than other materials since they exhibit high specific surface areas and narrow pore size distributions [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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Aminopropyl-functionalized mesoporous silica spherical particles were obtained through post-synthetic route. The suitability of this material as an adsorbent for heavy metals from aqueous media was tested by Cr(VI) adsorption experiments performed at various pH conditions, chromium concentrations and time. The synthesized particles were characterized before and after functionalization by X-ray diffraction at low angles, nitrogen adsorptiondesorption isotherms, infrared Fourier transform spectroscopy, scanning electron microscopy and thermogravimetric analysis. It was found that Cr(VI) adsorption occurs more efficiently in the pH range between 2 and 3. As a consequence of the nanometer scale of the particles, concentration profiles do not develop inside of them and thus there are no diffusional restrictions within the pores, leading to a higher Cr(VI) adsorption than that previously reported for similar systems. Chromium desorption for material reutilization was carried out in basic media. Results showed that the amino groups were grafted successfully without mesostructure damage. These groups are essential for the metal ion removal and no significant leaching was observed after four use/regeneration/use cycles. The batch equilibrium data fitted well the Langmuir isotherm with a maximum adsorption capacity of 87.1 mg g -1 at 25°C. A discussion about the relationship between structure and its behavior as adsorbent, including regeneration and reusability, is given.

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Section: Chromium Adsorption Experimentssupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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“…The CO 2 uptakes measured at 1 atm under 273 K and 298 K were summarized in Table 7 (Nos. [20][21][22].…”

Section: Non-metal Doped Porous Carbonmentioning

confidence: 99%

“…[20,21] MOFs composed by a variety of metals can be good precursors for metal/metal oxide decorated porous carbon. While most of the articles related to this area do not concentrate on the properties in porosity, BET surface areas and pore volumes can be important to some extent.…”

Section: Non-metal Doped Porous Carbonmentioning

confidence: 99%

“…[6,7] MOFs have intrinsic advantages of high porosity [8,9] and tailorable structure diversity, [10][11][12][13][14][15] which not only make them suitable for generating various porous materials but also provide infinite possibility in producing porous carbons with diverse decoration. Decorated carbons such as N-doped carbons and metal/metal oxide loaded carbons always possess enhancement in the performances of electrode [16,17] and absorbent, [18][19][20][21] or are capable of numerous kinds of catalysis reactions (including electrocatalysis process). [6,7,[22][23][24] Before the utilization of MOFs, porous carbons had been already synthesized in extensive methods, [25] including chemical activation, [26] pyrolysis of organic precursor, [27] carbonization of polymer aerogel [28,29] and nano-casting technique.…”

Section: Introductionmentioning

confidence: 99%

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Metal‐Organic Frameworks Derived Porous Carbons: Syntheses, Porosity and Gas Sorption Properties

Pei

Chen

et al. 2016

Chin. J. Chem.

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Porous carbon materials derived from metal-organic frameworks (MOFs) have been brought into stage due to the intrinsic advantages of MOFs such as high porosity and tailorable structure diversity, which might provide infinite possibility in producing porous carbons with diverse structures and various decorations. Inherited from MOFs, the porosity in carbon materials is an important factor to evaluate the performances of porous carbons (e.g. gas sorption properties, electrochemical and catalytic behaviors). Factors that affect the porosity of porous carbon materials are mainly focused on the porosity of pristine MOFs, additives and conducting conditions. However, during past decades there were still no systematical reports on the influence factors of porosity in MOFs derived porous carbon materials and corresponding gas sorption properties. In this review, we will summarize the performances of MOF-derived carbon materials (i.e. non-doped porous carbons, heteroatoms doped porous carbons, metal/metal oxide decorated porous carbons) and give a detailed discussion about the connections between the properties and four major effects (calcination temperature, loading of additional precursor, post-synthetic treatment as well as intrinsic properties of MOFs).

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Pyrolysis of chemically treated corncob for biochar production and its application in Cr(VI) removal

Gupta

Ram

Bala

et al. 2017

Env Prog and Sustain Energy

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In this study, corncob was used as raw material for biochar production. Slow pyrolysis of corncob was done at different temperatures (400–600°C) with a constant heating rate of 16°C/min in a quartz reactor with the aim to produce biochar. The physicochemical treatment of corncob was done to make it suitable for pyrolysis. Chemical treatment was done at different o‐phosphoric acid to corncob ratio (PA/CC) of 0.5, 1.0 and 1.2 for improvement of quality and yield of produced biochar. With increasing temperature biochar yield decreased but pretreatment showed an increase in the yield. Biochar yield was found optimum at PA/CC of 1.0. The FTIR, SEM, TGA and XRF analysis of corncob and biochar were done to see the changes before and after pyrolysis. Presence of different inorganic elements along with lesser H/C and O/C ratios makes biochar as additive for soil amendment. Also lesser H/C and O/C ratios and HHV of 19.97 MJ/kg confirms biochar suitable as solid fuel. Further application of biochar was examined for Cr(VI) removal from aqueous solution as innovative adsorbent in batch process with varying parameters such as pH, initial concentration of Cr(VI) solution, contact time and adsorbent dose. Maximum removal of Cr(VI) was found to be 93% at pH 2.01, initial Cr(VI) concentration 50 mg/L, adsorbent dose 10 g/L and equilibrium time of 90 min. Langmuir isotherm showed a better fitting model and maximum adsorption capacity was 25.69 mg/g. Biochar showed good repeatability by reusing it twice as adsorbent for Cr(VI) removal. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1606–1617, 2018

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N-doped porous carbon with magnetic particles formed in situ for enhanced Cr(VI) removal

Cited by 192 publications

References 28 publications

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Metal‐Organic Frameworks Derived Porous Carbons: Syntheses, Porosity and Gas Sorption Properties

Pyrolysis of chemically treated corncob for biochar production and its application in Cr(VI) removal

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