The effect of acid treatment of carbon cloth on the adsorption of nitrite and nitrate ions

Afkhami, Abbas; Madrakian, Tayyebeh; Karimi, Ziba

doi:10.1016/j.jhazmat.2006.10.062

Cited by 130 publications

(52 citation statements)

References 21 publications

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“…These materials include anions and cations and organic matters [51][52][53][54][55]. Anions such as sulfate, nitrate, carbonate, chloride, bicarbonate, and phosphate influence adsorption by adjustment of the electrostatic charge at the solid surface because of the same negative ions [11,[56][57][58][59][60][61].…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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“…The acid treatment was found to increase the adsorption capacity of the resulting ACC and the adsorption rate for all the investigated anions with respect to distilled water-treated samples. Nevertheless, the capacity and the rate of adsorption of nitrate ions onto both the water-and acid-treated samples were higher for nitrate than for nitrite [131]. Similarly, for both cloths, better results were found for molybdate than for tungstate ions [132].…”

mentioning

confidence: 85%

“…Although in limited extent, adsorption of some inorganic anions onto activated carbon cloths has also been explored. Afkhami et al [131,132] investigated the adsorption of molybdate (Mo[VI]), tungstate (W[VI]), nitrate, and nitrite ions from single solute solutions at pH ∼7 onto the same commercial ACC (Spectracarb 2225) used in the studies concerning metal cations uptake, already mentioned. To examine the effect of surface functional groups, modification of the ACC in these cases involved treatment of the samples with H 2 SO 4 acid solution (4 M).…”

mentioning

confidence: 99%

Development and Environmental Applications of Activated Carbon Cloths

Cukierman

2013

ISRN Chemical Engineering

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Activated carbon cloths have received growing attention because they offer comparative advantages over the traditional powdered or granular forms of this well-known adsorbent, providing further potential uses for technological innovations in several fields. The present article provides an overview of research studies and advances concerned with the development of activated carbon cloths and their use as adsorbent in environmental applications, mostly reported in the last years. The influence of some fabrics and textile wastes used as precursors, and of main activation process variables on the development and physicochemical, mechanical and/or electrical properties of the resulting activated carbon cloths are first reviewed. Then, investigations dealing with the removal of water and air pollutants by adsorption onto activated carbon cloths, including advances toward optimizing their regeneration after organic vapors saturation, are presented.

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“…Similar observations have been recorded by other workers. Acid-treated carbon cloth has significantly increased the adsorption of nitrite and nitrate (Afkhami et al, 2007) and acidic pH has been most effective for favoring adsorption of nitrate to charcoal (Ozturk and Bektas, 2004). Mean per cent reduction in adsorption of the anions, 95.5, has been highest in presence of alkaline salts, mean pH at equilibrium, 11 to 12.…”

Section: Shabir Ahmed Mirmentioning

confidence: 99%

Effect of Electrolytes on the Adsorption of Nitrite and Nitrate from Aqueous Solutions by Activated Carbon

Shabir¹

2010

Journal of Applied Sciences and Environmental Management

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Nitrite and nitrate levels were quantitatively adsorbed to wood-derived activated carbon in aqueous system and the effects of electrolytes investigated in this study using batch sorption process. The data showed that nitrate adsorbed nearly 1.5 times higher than that of nitrite. The adsorption is adequately explained by Freundlich and Langmuir isotherm models (r=0.99) with parameters indicative of a beneficial adsorption.. However, the adsorption is markedly reduced in presence of electrolytes (P<0.01). A greater reduction in mean adsorption of the anions occurs in presence of alkaline salts (Na3PO4, CH3COONa; 95.5 per cent) and neutral chloride salts (NaCl, MgCl2; 90.4 per cent) compared to those observed in presence of neutral sulfate salts (Na2SO4, MgSO4; 67.8 per cent) and acidic salts (ZnSO4, NaH2PO4; 52.2 per cent). Acetic acid increases adsorption of nitrite by about 26 per cent (P<0.01) and decreases that of nitrate by ca. 30 per cent (P<0.01). The study reveals that nitrite and nitrate are beneficially adsorbed to the charcoal, and presence of electrolytes in general causes greater reduction, over 50 per cent, in their adsorption to the charcoal. @ JASEM

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The effect of acid treatment of carbon cloth on the adsorption of nitrite and nitrate ions

Cited by 130 publications

References 21 publications

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Development and Environmental Applications of Activated Carbon Cloths

Effect of Electrolytes on the Adsorption of Nitrite and Nitrate from Aqueous Solutions by Activated Carbon

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