Removal of Nitrate from Water by Adsorption onto Zinc Chloride Treated Activated Carbon

Bhatnagar, Amit; Ji, Min-Kyu; Choi, You Hee; Jung, Woo‐Sik; Lee, Sang Hun; Kim, Sun Joon; Lee, Giehyeon; Suk, Heejun; Kim, Hyoung Soo; Min, Booki; Kim, Seong Heon; Jeon, Byong‐Hun; Kang, Joon Wun

doi:10.1080/01496390701787461

Cited by 137 publications

(46 citation statements)

References 36 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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“…Therefore, the removal efficiency of nitrate increased. Similar trends were observed in other research studies [10,11]. Phenol groups present in the activated carbon have acidic properties.…”

Section: Optimum Preparation Conditions Of the Ggr Activated Carbonsupporting

confidence: 91%

“…There is an increasing demand for the removal of phosphate and nitrate from water and wastewater, due to an increase in their pollution. High stability and solubility of nitrate and phosphate impose a great challenge for their removal [10]. Thus, the development of efficient methods and high-performance adsorbent for the removal of nitrate and phosphate is of crucial importance [9].…”

Section: Introductionmentioning

confidence: 99%

“…Activated carbon has a high specific surface area, low density, microporous structure, high chemical resistance, high surface reactivity, and high adsorption capacity. It has been successfully utilized for adsorption of various chemical species [10,14,16,17]. Due to the high demand for activated carbon, and subsequently, the high cost of this adsorbent, utilization of renewable sources as an alternative source for the production of activated carbon has gained attention [14].…”

Section: Introductionmentioning

confidence: 99%

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Activated carbon produced from Glycyrrhiza glabra residue for the adsorption of nitrate and phosphate: batch and fixed-bed column studies

et al. 2020

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In the present study, Glycyrrhiza glabra residues (GGR) were used for the preparation of activated carbon, with a surface area of 959.22 m 2 g −1 . Activated carbon was prepared through chemical activation using ZnCl 2 at optimum carbonization temperature, and impregnation ratio for nitrate, and phosphate removal. The effect of contact time and adsorbent dosage on the removal efficiency was investigated, and the pseudo-second-order kinetic model correlated well with the adsorption data. The response surface methodology was applied for the determination of the effect of initial concentration, pH, and temperature and their interaction on the removal efficiency in the batch adsorption system. The Langmuir isotherm generated a satisfactory fit with the experimental data, and the maximum adsorption capacity was 142.5 mg g −1 at 308 K and 92.5 mg g −1 at 298 K for nitrate and phosphate removal, respectively. The high adsorption capacity reveals the applicability of the GGR activated carbon for nitrate and phosphate removal. Furthermore, the fixed-bed column adsorption studies were carried out, and the effect of flow rate and influent concentration on the behavior of the breakthrough curve was studied. The breakthrough time decreased by increasing the flow rate and inlet concentration. The Thomas and Yoon-Nelson models were suitable models for the design of GGR activated carbon fixed-bed column. The LUB of 0.44 cm and 4.35 cm was obtained for nitrate and phosphate with the inlet concentration of 20 mg L −1 and a flow rate of 40 mL min −1 , respectively. GGR is a new adsorbent that has not been previously utilized for adsorption of phosphate and nitrate.

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“…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: 95%