Preparation of activated carbons from corncob with large specific surface area by a variety of chemical activators and their application in gas storage

Sun, Yunjuan; Webley, Paul A.

doi:10.1016/j.cej.2010.06.031

Cited by 199 publications

(83 citation statements)

References 31 publications

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“…The bands located at 2923 and 2854 cm À1 indicate C-H vibrations methylene and methyl groups (Sun and Webley, 2010). The band at 1744 cm À1 indicates carbonyl C¼O groups.…”

mentioning

confidence: 99%

Adsorption of cationic dyes on activated carbon obtained from waste Elaeagnus stone

Geçgel

Üner

Gökara

et al. 2016

Adsorption Science & Technology

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Activated carbon was obtained from waste Elaeagnus stone by a chemical activation method utilizing ZnCl 2 . The resultant Elaeagnus activated carbon (EAC) with a high activated specific surface area of 1588 m 2 /g was characterized using Brunauer-Emmett-Teller method, Fourier transform infrared spectra, point of zero charge, and scanning electron microscopy. The removals of cationic dyes, i.e., malachite green (MG), rhodamine B (RB), and methylene blue (MB) from aqueous solutions via EAC adsorption were characterized by investigating the effects of adsorbent concentration, contact time, initial dye concentration, and temperature. Langmuir model provided the most appropriate fit for all EAC dye adsorption processes, and the adsorption capacities for MB, RB, and MG at 25 C were calculated to be 288.18, 281.69, and 432.90 mg/g, respectively. The EAC adsorption curves of MB, RB, and MG follow a pseudo second-order kinetic model, and the calculated thermodynamic parameters, i.e., ÁG , ÁH , and ÁS revealed that the synthetic dye adsorptions from aqueous solution were endothermic and spontaneous.

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“…The bands located at 2923 and 2854 cm À1 indicate C-H vibrations methylene and methyl groups (Sun and Webley, 2010). The band at 1744 cm À1 indicates carbonyl C¼O groups.…”

mentioning

confidence: 99%

Adsorption of cationic dyes on activated carbon obtained from waste Elaeagnus stone

Geçgel

Üner

Gökara

et al. 2016

Adsorption Science & Technology

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“…The third stage of decomposition of the sample occurs between the temperatures of 670 °C and 920 °C, with a weight loss of 7.16%. Phenolic and carbonyl groups decompose at 800 °C to produce CD and CD 2 (Bandosz, 1999;Hayashi et al, 2000;Polovina et al, 1997;Sun & Webley, 2011;Tancredi et al, 2004). Thus, the highest percentage in mass was observed in the range referring to the oxygen and carboxyl groups, and the lowest in the phenolic and carbonyl groups.…”

Section: Adsorbent Characterizationmentioning

confidence: 88%

Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

et al. 2018

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Hydrocolloids of Pereskia aculeata Miller (DPNH) are potential ingredients in food industry as emulsifiers and stabilizers. The extraction process of DPNH requires the removal of pigments with activated carbon. Because this step is critical to the quality of the ingredient and has an impact on costs, a new activated carbon has been developed with residues from the same process. Residues activated with NaDH and H 3 PD 4 (300 °C, 1 h) were subjected to batch adsorption tests in model solutions of malachite green (MG), carbohydrate and protein. Residue treated with 85% H 3 PD 4 (DPNAC) had higher productivity and MG adsorption capacity, displaying a predominantly microporous surface (MEV/BET) with chemical activation confirmed by TG/FTOR. DPNAC showed higher MG and protein adsorption capacity than the commercial activated carbon (CAC) did. Results for MG-adsorption capacity by DPNAC did not show significant differences in the presence of protein and carbohydrate, presenting the higher affinity of the adsorbent for the dye. Adsorption isotherms showed DPNAC to be more favorable to MG adsorption than CAC, and to have a good fit to Langmuir-Freundlich model. DPNAC made it possible to reduce costs and allowed the sustainability of the process, leading to increased efficiency in selective pigment removal compared with CAC.Keywords: adsorption; carbohydrate; malachite green; protein; sustainable process.Practical Application: The activated carbon obtained using solid residues of the extraction process of hydrocolloids from Pereskia aculeata Miller proved to be more effective in protein and pigment adsorptions and less effective in carbohydrate adsorption when compared to using a commercial activated carbon. The potential use is waste treatment systems and clarification process.

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“…Apart from being used for dye sorption, corncobs are also reported to be widely used for removal of heavy metals from aqueous solutions [13][14][15][16]. Corncobs are also equally commonly used to obtain activated carbon [17][18][19][20][21]. Activated carbon obtained from corncobs is used to adsorb several water contaminants such as methylene glycol [22], chlorophenol [23], dyes [24] or heavy metal ions [16,[25][26][27].…”

Section: Methodsmentioning

confidence: 99%

Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent

Tomczak

Blus

2016

Ecological Chemistry and Engineering S

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Abstract:The azo dye and plant-derived sorbent system was investigated in this paper. Direct Orange 26 azo dye was acquired from Boruta-Zachem Kolor Sp. z o.o. Chemically modified granulated corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed bed column. Breakthrough curves were plotted for different initial concentrations, volumetric flow rates and bed heights. Sorption dynamics was described by a model presented in the literature. It was demonstrated that Infrared analysis of the system allows to determine the nature of the dye-sorbent bond. It was found that corncobs can be used as a promising sorbent material.

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Preparation of activated carbons from corncob with large specific surface area by a variety of chemical activators and their application in gas storage

Cited by 199 publications

References 31 publications

Adsorption of cationic dyes on activated carbon obtained from waste Elaeagnus stone

Adsorption of cationic dyes on activated carbon obtained from waste Elaeagnus stone

Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent

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