Pre-oxidation effect on ammoxidation of activated carbon and its influence on Cu(II) adsorption

Mahaninia, Mohammad H.; Kaghazchi, Tahereh; Soleimani, Mansooreh; Rahimian, Paria; Esfandiari, Ali

doi:10.1080/19443994.2014.994109

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…According to the data presented in Table 6, the maximum adsorption capacities obtained for the samples studied in this work (especially N-doped activated carbon) are comparable to or higher than the literature values for many adsorbents obtained from different precursors. For example, the adsorption capacity towards copper(II) ions exceeds the results obtained for activated carbons modified by tannic acid [36], sodium diethyl dithiocarbamate immobilization [37], or non-thermal plasma [38], although they were much lower than the results obtained for pre-oxidized and ammoxidized commercial activated carbon (optimum adsorption capacity ~250 mg/g) [39] or carbonaceous nanofibers [40] and crosslinked chitosan [41]. Similar results were obtained for zinc(II) ions.…”

Section: Sorption Isotherms Studiessupporting

confidence: 61%

Removal of Heavy Metal Ions from One- and Two-Component Solutions via Adsorption on N-Doped Activated Carbon

et al. 2021

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This paper deals with the adsorption of heavy metal ions (Cu2+ and Zn2+) on the carbonaceous materials obtained by chemical activation and ammoxidation of Polish brown coal. The effects of phase contact time, initial metal ion concentration, solution pH, and temperature, as well as the presence of competitive ions in solution, on the adsorption capacity of activated carbons were examined. It has been shown that the sample modified by introduction of nitrogen functional groups into carbon structure exhibits a greater ability to uptake heavy metals than unmodified activated carbon. It has also been found that the adsorption capacity increases with the increasing initial concentration of the solution and the phase contact time. The maximum adsorption was found at pH = 8.0 for Cu(II) and pH = 6.0 for Zn(II). For all samples, better fit to the experimental data was obtained with a Langmuir isotherm than a Freundlich one. A better fit of the kinetic data was achieved using the pseudo-second order model.

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Section: Sorption Isotherms Studiessupporting

confidence: 61%

Removal of Heavy Metal Ions from One- and Two-Component Solutions via Adsorption on N-Doped Activated Carbon

et al. 2021

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“…A concurrent process of oxidation and nitriding takes place during ammoxidation, resulting in substantial alterations to the material's chemical structure. The ammoxidation process serves as a means to incorporate considerable nitrogen content into the carbon structure, resulting in a material characterised by a more well-developed total surface area and increased microporosity compared to nitrogen-unmodified coals [14].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Nitrogen Dioxide on Nitrogen-Enriched Activated Carbons

Bazan-Wozniak,

Nosal-Wiercińska,

Cielecka-Piontek

et al. 2024

IJMS

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The aim of this study was to obtain nitrogen-enriched activated carbons from orthocoking coal. The initial material was subjected to a demineralisation process. The demineralised precursor was pyrolysed at 500 °C and then activated with sodium hydroxide at 800 °C. Activated carbon adsorbents were subjected to the process of ammoxidation using a mixture of ammonia and air at two different temperature variants (300 and 350 °C). Nitrogen introduction was carried out on stages of demineralised precursor, pyrolysis product, and oxidising activator. The elemental composition, acid-base properties, and textural parameters of the obtained carbon adsorbents were determined. The activated carbons were investigated for their ability to remove nitrogen dioxide. The results demonstrated that the ammoxidation process incorporates new nitrogen-based functional groups into the activated carbon structure. Simultaneously, the ammoxidation process modified the acid-base characteristics of the surface and negatively affected the textural parameters of the resulting adsorbents. Furthermore, the study showed that all of the obtained carbon adsorbents exhibited a distinct microporous texture. Adsorption tests were carried out against NO2 and showed that the carbon adsorbents obtained were highly effective in removing this gaseous pollutant. The best sorption capacity towards NO2 was 23.5 mg/g under dry conditions and 75.0 mg/g under wet conditions.

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“…Among these methods, adsorption seems to be a superior technique to remove heavy metal ions because it was cost‐effective and convenient to design . Many adsorbents, like modified silica, activated carbon, inorganic materials, and biomass, have been studied for copper ions removal. Biosorbents have been proved to be one of the effective adsorbents for removing copper ions.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of magnetic chitosan modified with thiosemicarbazide for adsorption of copper ions from aqueous solution

Cui

Wang

Zeng

2016

J of Applied Polymer Sci

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In this study, magnetic chitosan modified with thiosemicarbazide (TSC-Fe 3 O 4 /CTS) was facilely synthesized with glutaraldehyde as the crosslinker, and its application for removal of Cu(II) ions was investigated. The as-prepared TSC-Fe 3 O 4 /CTS was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). The results showed that TSC-Fe 3 O 4 /CTS has high adsorption capacity and selectivity towards Cu(II) ions. Adsorption experiments were carried out with different parameters such as pH, solution temperature, contact time and initial concentration of Cu(II) ions. The adsorption process was better described by the pseudo-second-order model. The sorption equilibrium data was fitted well with the Langmuir isotherm model and the maximum adsorption capacity toward Cu(II) ions was 256.62 mg/g. The thermodynamic parameters indicated that the adsorption process of Cu(II) ions was exothermic spontaneous reaction. Moreover, this adsorbent showed excellent reusability and the adsorption property remained stable after five cycles. This adsorbent is believed to be one of the promising and favorable adsorbent for the removal of Cu(II) ions from aqueous solution. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44528.

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Pre-oxidation effect on ammoxidation of activated carbon and its influence on Cu(II) adsorption

Cited by 4 publications

References 39 publications

Removal of Heavy Metal Ions from One- and Two-Component Solutions via Adsorption on N-Doped Activated Carbon

Removal of Heavy Metal Ions from One- and Two-Component Solutions via Adsorption on N-Doped Activated Carbon

Adsorption of Nitrogen Dioxide on Nitrogen-Enriched Activated Carbons

Facile preparation of magnetic chitosan modified with thiosemicarbazide for adsorption of copper ions from aqueous solution

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