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:: Volume 3, Issue 4 (9-2016) ::
jehe 2016, 3(4): 323-335 Back to browse issues page
Removal of Nitrate from Aqueous Solutions by Starch Stabilized nano Zero-Valent Iron(nZVI)
Kaveh Yaghmaeian, Ahmad Mehrafrooz, Ali Pouraslan, Madineh Akbarpour, Bahman Akbarpour *
Abstract:   (2977 Views)

Background and Objective: Nitrate is one of the inorganic anions derived as a result of oxidation of elemental nitrogen. Urban and industrial wastewater, animal and vegetable waste products in large cities that have organic nitrogen are excreted along the soil. The primary risk of Nitrate in drinking water occurs when nitrate in the gastrointestinal tract switch to nitrite. Nitrite causes the oxidation of iron in hemoglobin of red blood cells, result in red blood cells could not carry the oxygen, a condition called methemoglobinemia. Therefore, achieving the new technologies for nitrate removal is necessary.

Material and Methods: The present study was conducted at laboratory Scale in non-continuous batches. Stabilized adsorbent was produced through reducing Iron sulfate by sodium borohydride (NaBH4) in presence of Starch (0.2W %) as a stabilizer. At first, the effect of various parameters such as contact time (10-90min), pH (3-11), adsorbent dose (0.5-3 g/L) and initial concentration of arsenate (50-250 mg/L) were investigated on process efficiency. Freundlich and Langmuir isotherm model equilibrium constant, were calculated. Residual nitrate were measured by using the DR5000 spectrophotometer.

Results: The optimum values based on RSM for pH, absorbent dose, contact time, and initial concentration of nitrate were 5.87, 2.25 g/L, 55.7 min, and 110.35 mg/L respectively. Langmuir isotherm with R2= 0.9932 for nitrate was the best graph for the experimental data. The maximum amount of nitrate adsorption was 138.88mg/g.

Conclusion: Stabilized absorbent due to have numerous absorption sites and Fe0 as a reducing agent could have great potential in nitrate removal from water.

Keywords: Adsorption, Nitrate, Starch, Modified Zero Valent Iron Nanoparticles.
Full-Text [PDF 460 kb]   (1552 Downloads)    
Type of Study: Research | Subject: Special
Received: 2017/01/8 | Accepted: 2017/01/8 | Published: 2017/01/8
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Yaghmaeian K, Mehrafrooz A, Pouraslan A, Akbarpour M, Akbarpour B. Removal of Nitrate from Aqueous Solutions by Starch Stabilized nano Zero-Valent Iron(nZVI). jehe. 2016; 3 (4) :323-335
URL: http://jehe.abzums.ac.ir/article-1-273-en.html

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Volume 3, Issue 4 (9-2016) Back to browse issues page
مجله مهندسی بهداشت محیط Journal of Environmental Health Enginering
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