Adsorption of nitrate ions onto activated carbon prepared from rice husk by NaOH activation

Zhang, Ying; Song, Xiaolan; Huang, Shutao; Geng, Bai-yang; Chang, Chi-Hsien; Sung, I-Yen

doi:10.1080/19443994.2013.809984

Cited by 21 publications

(14 citation statements)

References 25 publications

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“…Figure 4(b) shows that a -GA-10%, a -GA-14% and a -GA-18% exhibit similar adsorption capability for pb 2+ despite of their significant differences in volume. Their adsorption capability could be as high as 80 mg g −1 , which is higher than those of a -GA-22% (about 68 mg g −1 ) and GA (55 mg g −1 ) and much better than that of activated carbon383940. That means without sacrificing the adsorption capacity, the volume of a -GA-N can be controlled to save space and it is more convenient and efficient to remove some pollutants out of water.…”

Section: Resultsmentioning

confidence: 99%

Strengthening of Graphene Aerogels with Tunable Density and High Adsorption Capacity towards Pb2+

Han

Tang

Shen

et al. 2014

Sci Rep

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Graphene aerogels (GAs) with high mechanical strength, tunable density and volume have been prepared only via soaking graphene hydrogels (GHs) in ammonia solution. The density and volume of the obtained GAs are controlled by adjusting the concentration of ammonia solution. Although volume of the GAs decreases with increasing the concentration of ammonia solution, its specific surface area maintains at about 350 m2 g−1, and the inner structure changes to radial after ammonia solution treatment. Thus, GAs are particularly suitable for the adsorption and energy storage applications owing to their high specific surface area and unique porous structure. The adsorption capacity of GAs for Pb2+ from aqueous solution maintains at about 80 mg g−1, which could reach as high as 5000 g m−3 per unit volume and they can be separated easily from water after adsorption.

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Section: Resultsmentioning

confidence: 99%

Strengthening of Graphene Aerogels with Tunable Density and High Adsorption Capacity towards Pb2+

Han

Tang

Shen

et al. 2014

Sci Rep

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“…Authors of the article (Zhang et al, 2014) suggested that the adsorption rate for carbon adsorbent depended on the availability of adsorption sites rather than on the ions concentration in solution, but it would have rather related to ion-exchange mechanism in double electric layer around the carbon adsorbent, and not only with the presence of the polar functional groups on its surface. Although, on the other hand, the increase in the number of ions in a double layer of carbon may be the result of the increase in the number of polar functional groups on its surface.…”

Section: Discussionmentioning

confidence: 99%

“…This is somewhat surprising, because the oxidation of carbon adsorbent with H 2 O 2 causes an increase in cation-exchange groups on the surface, but it did not result in growth of the ammonium cation sorption, but increased the sorption of anions of nitrate and nitrite. By comparing the values of sorption capacity, designated in dynamic analysis (SPE) and the values of the adsorption of nitrate ion in static conditions, as it was obtained by the authors of the work (Zhang et al, 2014), it turned out that our values are much lower ($0.8 mg/g) for carbon AG-5 oxidized with 30% H 2 O 2 and $70 mg/g for adsorbents in studies Zhang et al This marked difference in the values of the adsorption of nitrate ions can be caused by several reasons. Above all, Zhang et al conducted the research under static conditions and with solutions of strongly higher concentrations nitrate ions (400 mg/L), while we conducted the sorption process in the dynamic conditions from the solutions with a concentration below 1 mg/L.…”

Section: Sorption Capacity Of the Adsorbentsmentioning

confidence: 99%

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Adsorption of nitrate, nitrite, and ammonium ions on carbon adsorbents

Gierak

Łazarska

2017

Adsorption Science & Technology

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This work presents the results of the investigations of the adsorption process of nitrate, nitrite, and ammonium ions on carbon adsorbent with the application of the solid phase extraction method to isolate and enrich the investigated ions from aqueous solutions of the concentration below 1 mg/L. For the determination of the concentration of the analyzed ions, we applied the ion chromatography method. The sorption capacity for the tested adsorbents as well as the efficiency of the enrichment of the investigated ions were determined.

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“…Therefore, it is very important to select the appropriate nitrate adsorption material [8,9]. Many materials, such as activated carbon, sepiolite, chitosan and ion exchange resin [8,[10][11][12] can remove nitrate in water, but most of these compounds have high production costs, complex synthesis processes or are difficult to regenerate. Accordingly, they are not suitable for the treatment of large areas of nitrate-contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Yang

et al. 2017

Water

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Steel slag, which makes up a gigantic amount of metallurgical industrial solid waste, was in this experiment successfully synthesized an inexpensive adsorbent used to remove nitrate pollution from aqueous solution. This adsorbent was obtained by mixing steel slag, aluminium hydroxide and deionized water, and aging this at a mass ratio of 3:0.45:2, and then activating it at 800 • C. The physicochemical characteristics of the steel slag before and after modification were investigated to compare the effect of their surface properties on the adsorption behaviour of nitrate. The effects of adsorbent dosage, pH, and contact time on the adsorption process were investigated. The results showed that an increase in specific surface area and the formation of a positive surface of the modified steel slag (MSS) compared with the original steel slag (OSS) could effectively increase the number of the active adsorption sites and nitrate removal ability. The optimum parameters for nitrate removal were as follows: the concentration of nitrate was 20 mg/L, the dosage was 1 g/100 mL, the pH was four, and the reaction time was 180 min. The adsorption capacity of the MSS was approximately 1.9 times that of the OSS. The nitrate adsorption of the MSS was in accordance with the pseudo-second-order model and the Freundlich model, which indicated that the adsorption of nitrate on the MSS was mainly single layer chemical adsorption. The mechanism of nitrate removal mainly included ion exchange, hydrogen bonding, electrostatic interactions and intermolecular interactions. In addition, regeneration experiments indicated that the MSS after regeneration still had the capacity to remove nitrate.

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Adsorption of nitrate ions onto activated carbon prepared from rice husk by NaOH activation

Cited by 21 publications

References 25 publications

Strengthening of Graphene Aerogels with Tunable Density and High Adsorption Capacity towards Pb2+

Strengthening of Graphene Aerogels with Tunable Density and High Adsorption Capacity towards Pb2+

Adsorption of nitrate, nitrite, and ammonium ions on carbon adsorbents

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

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