A Peach Stone Activated Carbon Chemically Modified to Adsorb Aqueous Ammonia

Soto-Garrido, G.; Aguilar, Croswel; Garcı́a, R.; Arriagada, Renán

doi:10.4067/s0717-97072003000300013

Cited by 19 publications

(7 citation statements)

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“…The modification using nitric acid increased the lead ion adsorption capacity. This agrees with the increase in acidic functional surface groups with oxidation of the carbon and to the increase in total charge on the carbon surface, as mentioned in the literature (Soto-Garrido 2003). The surface chemical structure of the ACs obtained is characterized by the formation of acid-type oxygenated groups, which affect their behavior when used as adsorbents or as catalyst supports.…”

Section: Resultssupporting

confidence: 73%

Pb2+ adsorption from aqueous solutions on activated carbons obtained from lignocellulosic residues

Giraldo

Moreno–Piraján

2008

Braz. J. Chem. Eng.

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-Activated carbons obtained from cane sugar bagasse (ACB), African palm pit (ACP) and sawdust (ACS) were prepared through an impregnated with HNO 3 and thermal treatment in an atmosphere in N 2 /steam water at 1173 K. Adsorption isotherms of N 2 at 77 K and of CO 2 at 273 K were determined for the activated carbons for which surface area and pore volume values were from 868 to 1100 m 2 g -1 and from 0.27 to 0.55cm 3 g -1 , respectively. These results were correlated, with the ones obtained for adsorption the adsorption isotherms of Pb 2+ in aqueous solutions. Impregnation of the lignocellulosic materials with nitric acid produced acid-type activated carbons with total acid site contents between 4.13 and 6.93 mmol g -1 and pH at the point of zero charge values between 2.7 and 4.1, which were within range of the adsorption, at different pH values, since they determined, the surface charge of the activated carbons. Adsorption isotherms of Pb 2+ at different pH values (2-8) at 298 K were determined. The ion adsorption capacity on ACB, ACP and ACS were 13.7, 15.2 and 17.5 mg.g -1 , respectively. Experimental data were fitted to the Langmuir and Freundlich models and all cases the former fit better. The highest values for the quantity adsorbed on the monolayer, qm, were at pH 4, whereas the surface, charge of activated carbons was negative and the lead species mainly present was Pb 2+ . For higher pHs, the quantity of Pb 2+ adsorbed decreased, and this had an important effect on adsorption, the surface characteristics of the solids and the hydroxilated lead species that were formed in the system.

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Section: Resultssupporting

confidence: 73%

Pb2+ adsorption from aqueous solutions on activated carbons obtained from lignocellulosic residues

Giraldo

Moreno–Piraján

2008

Braz. J. Chem. Eng.

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“…2. As can be seen the removal of ammonium with all samples increases when raising the pH from 2.5 to about 6 and then decreases again because clinoptilolite is highly selective for H 3 [6,19]. The decrease in the NH 4 + removal efficiency above pH 7 may be due to two factors: (1) partial dissolution of the natural clinoptilolite [13] and (2) possible conversion of NH 4 + into NH 3 [6,13,19].…”

Section: Effect Of Phmentioning

confidence: 83%

“…Ammonia and ammonium ions are the more commonly encountered N compounds in waste water and groundwater. There are different methods for removing ammonium ions from wastewaters: air stripping, chemical treatment, selective ion exchange, adsorption and biological nitrification-denitrification [1][2][3][4][5][6][7]. Previously we reported that carbon obtained from Bulgarian lignite from Chukurovo deposit by one-step steam pyrolysis-activation followed by oxidative modification gave comparable results despite its worse texture parameters as compared with Norit GAC 1240 oxidized in an analogous way and was a more promising adsorbent as a means of ammonia removal from aqueous solutions [8].…”

Section: Introductionmentioning

confidence: 90%

Investigation on natural and pretreated Bulgarian clinoptilolite for ammonium ions removal from aqueous solutions

Vassileva

Voikova

2009

Journal of Hazardous Materials

111

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“…However, for higher pyrolysed carbon cryogels the spectra are very simple without any significant absorption peak. FT-IR spectra of RF-P930 and RFGO-P930 cryogels are more similar to activated carbon [16,17], bituminous and subbituminous coal [18]. Carbon cryogels pyrolysed at 930 °C indicates strong absorption increase with decreasing wavenumber.…”

Section: Characterization Of Carbon Cryogelsmentioning

confidence: 93%

Effect of pyrolysis temperature and thermal oxidation on the adsorption properties of carbon cryogels

Hotová

Slovák

2015

Thermochimica Acta

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A Peach Stone Activated Carbon Chemically Modified to Adsorb Aqueous Ammonia

Cited by 19 publications

References 0 publications

Pb2+ adsorption from aqueous solutions on activated carbons obtained from lignocellulosic residues

Pb2+ adsorption from aqueous solutions on activated carbons obtained from lignocellulosic residues

Investigation on natural and pretreated Bulgarian clinoptilolite for ammonium ions removal from aqueous solutions

Effect of pyrolysis temperature and thermal oxidation on the adsorption properties of carbon cryogels

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