Selective adsorption of oxyanions on activated carbon exemplified by Filtrasorb 400 (F400)

Mahmudov, Rovshan; Huang, C. P.

doi:10.1016/j.seppur.2010.12.019

Cited by 75 publications

(19 citation statements)

References 27 publications

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“…Present results are in accordance with other findings suggesting that protonated amino groups and oxygen basic functionalities, such as pyrones and cromenes, could contribute to an enhanced development of the surface positive charge on the surface of the adsorbent, which should facilitate the uptake of nitrate ions (Keränen et al 2013;Nunell et al 2012). Moreover, the X mL values obtained in this work are higher than those previously reported in the literature for the adsorption of nitrate onto different activated carbons (Bhatnagar et al 2008;Demiral and Gündüzoğlu 2010;Mahmudov and Huang 2011;Nunell et al 2012;Ota et al 2013).…”

Section: Nitrate Adsorption Isothermssupporting

confidence: 92%

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nunell

Fernández

Bonelli

et al. 2015

Water Air Soil Pollut

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Two different adsorbents directed to nitrate removal from water were developed from Parkinsonia aculeata wood. An activated carbon was obtained by chemical activation with K 2 CO 3 at 800°C, whereas another adsorbent was prepared using a dilute solution of NH 4 Cl at 450°C. Elemental compositions, surface functional groups, and textural parameters of both adsorbents were determined and compared with those of a commercial activated carbon used as a reference. Nitrate adsorption assays were carried out to examine the effects of solution pH, adsorbent dosage, contact time, and equilibrium adsorption isotherms. The adsorbent obtained with K 2 CO 3 showed a well-developed pore structure (S BET =777 m 2 /g; V T =0.35 cm 3 /g) and neutral character, while the one prepared with NH 4 Cl exhibited a low porous development (S BET =58 m 2 /g; V T =0.03 cm 3 /g), acidic nature, and a noticeably high N content. The latter attained the highest nitrate removal efficiency, with a maximum adsorption capacity (X mL =0.40 mmol/g) higher than those estimated for the former (X mL =0.34 mmol/g) and the commercial sample (X mL =0.23 mmol/g), pointing to a predominant role of the chemical surface characteristics, mainly of N-containing groups and basic functionalities. Accordingly, the adsorbent obtained with NH 4 Cl represents a friendly novel material especially suited for nitrate removal.

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Section: Nitrate Adsorption Isothermssupporting

confidence: 92%

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nunell

Fernández

Bonelli

et al. 2015

Water Air Soil Pollut

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“…Adsorption by activated carbons (ACs) has proven to be very efficient in the removal of a wide variety of contaminants and has become one reliable method in the field of water treatment. Nevertheless, only few works have been devoted to examine nitrate uptake by ACs, with results indicating very low removal levels [3,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, some studies have also http focused their attention on post-treatments involving modifications in physicochemical properties of ACs in order to improve their performance in the uptake of a particular pollutant [17,28,29]. However, in the case of nitrate removal, this kind of approaches has not conducted to completely satisfactory results [3,22,30]. Therefore, further research is still needed to improve ACs performance toward adsorption of this priority pollutant.…”

Section: Introductionmentioning

confidence: 99%

Nitrate uptake improvement by modified activated carbons developed from two species of pine cones

Nunell

Fernández

Bonelli

et al. 2015

Journal of Colloid and Interface Science

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“…The extensive use of activated carbon for enhancing perchlorate removal has been reported. Mahmudov and Huang have showed that pristine activated carbon has moderate perchlorate uptake capacity compared with other major competing anions such as nitrate, sulfate and bicarbonates [33][34][35]. Increase in positive surface charge promotes the removal of anions while negatively charge surface enhances the removal of cations.…”

Section: Introductionmentioning

confidence: 99%

Functionalized activated carbon for the adsorptive removal of perchlorate from water solutions

Mahmudov

Chen

Huang

2015

Front. Chem. Sci. Eng.

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Two types of activated carbon, namely, Filtrasorb 400 and Nuchar SA, were functionalized by quaternary ammonium salts (quats), as to enhance perchlorate adsorption. Results showed that the adsorption of quats on Nuchar SA increased with increase in chain length (hydrophobicity) of quats. Filtrasorb 400, however, had limited uptake of long-chain quats such as dodecyltrimethylammonium and hexadecyltrimethylammoium (HDTMA). Results indicated that perchlorate removal by the functionalized activated carbon was directly related to the chain length of the modifying quats. Perchlorate removal by functionalized activated carbon increased with increase in chain length of the modifying quats and became less pH-dependent. Modified Nuchar SA had higher overall perchlorate removal capacity than the modified Filtrasorb F400, but was more strongly affected by pH than Filtrasorb 400. Activated carbon treated with HDTMA exhibited the best perchlorate removal capacity among all quats studied. Results indicated that tailoring the activated carbon surface with HDTMA rendered the activated carbon surface positively charged, which resulted in substantial increase in perchlorate removal compared to unfunctionalized activated carbons.

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Selective adsorption of oxyanions on activated carbon exemplified by Filtrasorb 400 (F400)

Cited by 75 publications

References 27 publications

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nitrate uptake improvement by modified activated carbons developed from two species of pine cones

Functionalized activated carbon for the adsorptive removal of perchlorate from water solutions

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