The removal of nitrate from aqueous solutions by chitosan hydrogel beads

Chatterjee, Sudipta; Woo, Seung Han

doi:10.1016/j.jhazmat.2008.09.001

Cited by 256 publications

(86 citation statements)

References 31 publications

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“…The equilibrium adsorption capacity is increased when the initial nitrate concentration is increased, but the essential time to reach equilibrium is independent of the initial nitrate concentration (Chatterjee & Woo 2009). The adsorption process reached equilibrium after about 12 and 7 h for Ze and Ze-nZVI, respectively.…”

Section: Methodsmentioning

confidence: 99%

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

2014

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Sepehri S., Heidarpour M., Abedi-Koupai J. (2014): Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles. Soil & Water Res., 9: 224-232.A report on the synthesis and characterization of nanoscale zero-valent iron in the presence of natural zeolite as a stabilizer is presented. This novel adsorbent (Ze-nZVI) was synthesized by the sodium borohydride reduction method. The scanning electron microscopy (SEM) images revealed that the stabilized nZVI particles were uniformly dispersed across the zeolite surface without obvious aggregation. The synthesized Ze-nZVI material was then tested for the removal of nitrate from aqueous solution. The effect of various parameters on the removal process, such as initial concentration of nitrate, contact time, initial pH, and Ze-nZVI dosage, was studied. Batch experiments revealed that the supported nZVI materials generally have great flexibility and high activity for nitrate removal from aqueous solution. The nitrogen mass balance calculation showed that ammonium was the major product of nitrate reduction by Ze-nZVI (more than 84% of the nitrate reduced); subsequently the natural zeolite in Ze-nZVI removed it completely via adsorption. The kinetic experiments indicated that the removal of nitrate followed the pseudo-second-order kinetic model. The removal efficiency for nitrate decreased continuously with an increase in the initial solution pH value and Ze-nZVI dosage but increased with the increase in the initial concentration of nitrate. The overall results indicated the potential efficacy of Ze-nZVI for environmental remediation application.

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Section: Methodsmentioning

confidence: 99%

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

2014

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“…Elevated levels of nitrate in drinking water can cause many health problems such as gastric cancer, which results from the reduction of nitrate to nitrosamines in the stomach [6]. In addition, methemoglobinemia or blue baby syndrome, a serious health risk, occurs when nitrate is converted to nitrite, which then reacts with the hemoglobin to cause blueness of the skin of newborn infants [7]. After ingestion of plants or water high in 3 …”

Section: Introductionmentioning

confidence: 99%

Effective Removal of Nitrates Ions from Aqueous Solution Using New Clay as Potential Low-Cost Adsorbent

Ouardi¹,

Qourzal²,

Alahiane³

et al. 2015

JEAS

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In the present study, we investigated the performance of clay mineral originated from a dam situated in Morocco (Agadir city), as natural, low-cost, alternative and eco-friendly adsorbent for removal of nitrates ions from aqueous solution within a batch process. The clay was characterized by X-ray diffraction, Scanning Electron Microscopy (SEM), Dispersive Energy of Spectroscopy (EDS), Fourier Transform Infrared (FTIR) and surface area analysis (BET). The effects of various experimental parameters are examined such as contact time, initial concentration of pollutant, adsorbent mass and solution pH. The removal of nitrate was 71.89% at natural pH (pH = 5.1) using 1 g/l of adsorbent in 500 ml of nitrate solution having initial concentration of 300 mg/l (effect of contact time). Adsorption kinetic study revealed that the adsorption process followed first order kinetic. Theoretical correlation of the experimental equilibrium adsorption data for the NitrateNew Clay system was properly explained by the Langmuir isotherm model. The maximum adsorption capacity was Qm, exp = 244.06 mg/g at 20˚C and at natural pH (with Q m, cal = 250 mg/g). An increase in adsorbent dosage increased the percent removal of nitrate, R = 1 g/l was considered as optimum dose and was used for further study. The pH heavily affected the adsorption capacity, and the percentage removal was found to decrease with increase in pH. The obtained results indicated that this New Clay (NC) was very good adsorbent for 3 NO − , interesting alternative material with respect to more costly adsorbent used, and could be used as a highly efficient adsorbent for the separation of nitrate from drinking or waste water.

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“…As a consequence of the last feature, many studies regarding the removal of metal ions from water can be found in the literature. For instance, chitosan hydrogel beads were studied for removal of nitrate (Chatterjee and Woo 2009), and protonated chitosan beads were used for fluoride (Viswanathan et al 2009). Chaunhan et al (2012) studied the removal of cadmium and hexavalent chromium from electroplating wastewater using thiocarbamoyl chitosan; Miretzky and Cirelli (2009) studied Hg(II) removal from water not only by chitosan but also its derivatives; and Chen and Chung (2006) evaluated the removal of As(III) and As(V) from water by chitosan itself due to its excellent biological properties.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Immobilized Pumice for the Removal of As(V) from Waters

Turan

Kocahakimoglu

Boyacı

et al. 2014

Water Air Soil Pollut

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A novel sorbent, chitosan-immobilized pumice, has been prepared for the sorption of As(V) from waters prior to its determination by hydride generation atomic absorption spectrometry. The success of the immobilization has been checked with such characterization techniques as scanning electron microscopy, thermal gravimetric analysis, and elemental analysis. Points of zero charge of the sorbents were determined with potentiometric mass titration. Batch-type equilibration studies have shown that the novel sorbent can be employed at a wide pH range resulting in quantitative sorption (>90 %) at pH 3.0-7.0 and greater than 70 % sorption at pH >8.0. These results demonstrate the advantage of immobilizing chitosan onto pumice, because, under the same conditions, pumice displays <20 % sorption toward As(V), whereas chitosan gives approximately 90 % sorption only at pH 3.0. The validity of the method was verified through the analysis of ultrapure, bottled drinking, and tap water samples spiked with arsenate; the respective sorption percentages of 93.2 (±0.7), 89.0 (±1.0), and 80.9 (±1.3) were obtained by batch-type equilibration. Arsenic sorption was also examined in the presence of common interfering ions resulting in competing effects of PO 4 3− and NO 3 − on As(V) adsorption.

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The removal of nitrate from aqueous solutions by chitosan hydrogel beads

Cited by 256 publications

References 31 publications

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

Nitrate removal from aqueous solution using natural zeolite-supported zero-valent iron nanoparticles

Effective Removal of Nitrates Ions from Aqueous Solution Using New Clay as Potential Low-Cost Adsorbent

Chitosan-Immobilized Pumice for the Removal of As(V) from Waters

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