Document Type : Full length

Authors

1 Faculty of Chemical Engineering, Sahand University of Technology, 51335-1996 Sahand, Tabriz, Iran

2 Chemical Engineering Faculty, Sahand University of Technology, P. O. Box: 51335-1996, Sahand, Tabriz, Iran

3 Polymer Research Center , Faculty of Petroleum and Chemical Engineering, Razi University , Kermanshah ,

4 Chemical Engineering Faculty, Amirkabir University of Tevhnology

Abstract

In this work, hydrophobic silica aerogels were synthesized using sol-gel method and drying at ambient pressure. The surface morphology, pore size, and the presence of functional groups on the surface of the nanoparticles were analyzed using FE-SEM, TGA, FT-IR, and EDX, respectively. After calcination at 500 °C, the hydrophilic property of the adsorbents was evaluated by water contact angle measurements. The calcinated silica aerogels were used for adsorption of nitrate from aqueous solution in both batch and continuous processes. In the batch process, the effect of initial nitrate concentration, contact time, pH level, and adsorbent dosage were investigated. Results showed that the nitrate removal percentage increased with the decrement of the pH level and the initial nitrate concentration. On the other hand, increasing the contact time and the adsorbent dosage resulted in higher removal percentage. Accordingly, process optimization resulted in a nitrate removal of 92.2 %. Furthermore, it was found that the equilibrium results were in agreement with the Langmuir isotherm model better than with the Freundlich model and also the adsorption kinetics followed the pseudo-second-order model. In the continuous process, the effects of the input flow rate, the bed height, and the initial nitrate concentration were investigated.

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Main Subjects

[1]     Moore, J. W., Inorganic contaminants of surface water: Research and monitoring priorities, Springer Science & Business Media, (2012).
[2]     Bhatnagar, A., Kumar, E. and Sillanpää, M., “Nitrate removal from water by nano-alumina: Characterization and sorption studies”, Chemical Engineering Journal, 163 (3), 317 (2010).
[3]     Organization, W. H., Guidelines for drinking-water quality: Recommendations, World Health Organization, (2004).
[4]     Majumdar, D. and Gupta, N., “Nitrate pollution of groundwater and associated human health disorders”, Indian Journal of Environmental Health, 42 (1), 28 (2000).
[5]     Mena-Duran, C., Kou, M. S., Lopez, T., Azamar-Barrios, J., Aguilar, D., Dominguez, M., Odriozola, J. and Quintana, P., “Nitrate removal using natural clays modified by acid thermoactivation”, Appl. Surf. Sci., 253 (13), 5762 (2007).
[6]     Kapoor, A. and Viraraghavan, T., “Nitrate removal from drinking water”, Journal of Environmental Engineering, 123 (4), 371 (1997).
[7]     Selecky, M., Adair, J. and Clifford, D., “Nitrate treatment alternatives for small water systems”, Department of Health, Washington, (2005).
[8]     Singh, N., Nagpal, G. and Agrawal, S., “Water purification by using adsorbents: A review”, Environmental Technology & Innovation, 11, 187 (2018).
[9]     Zhan, Y., Lin, J. and Zhu, Z., “Removal of nitrate from aqueous solution using cetylpyridinium bromide (CPB) modified zeolite as adsorbent”, Journal of Hazardous Materials, 186 (2), 1972 (2011).
[10]  Afkhami, A., Madrakian, T. and Karimi, Z., “The effect of acid treatment of carbon cloth on the adsorption of nitrite and nitrate ions”, Journal of Hazardous Materials, 144 (1), 427 (2007).
[11]  Mena-Duran, C., Kou, M. S., Lopez, T., Azamar-Barrios, J., Aguilar, D., Dominguez, M., Odriozola, J. A. and Quintana, P., “Nitrate removal using natural clays modified by acid thermoactivation”, Applied Surface Science, 253 (13), 5762 (2007).
[12]  Bergaya, F., Theng, B. K. G. and Lagaly, G., Handbook of clay science, Elsevier Science, Netherlands, (2011).
[13]  Inglezakis, V. J. and Zorpas, A. A., Handbook of natural zeolites, Bentham Science Publishers, (2012).
[14]  Liu, J., Cheng, X., Zhang, Y., Wang, X., Zou, Q. and Fu, L., “Zeolite modification for adsorptive removal of nitrite from aqueous solutions”, Microporous Mesoporous Mater., 252, 179 (2017).
[15]  Zhu, I. and Getting, T., “A review of nitrate reduction using inorganic materials”, Environmental Technology Reviews, 1 (1), 46 (2012).
[16]  Chatterjee, S. and Woo, S. H., “The removal of nitrate from aqueous solutions by chitosan hydrogel beads”, J. Hazard. Mater., 164 (2), 1012 (2009).
[17]  Masheane, M. L., Nthunya, L. N., Sambaza, S. S., Malinga, S. P., Nxumalo, E. N., Mamba, B. B. and Mhlanga, S. D., “Chitosan-based nanocomposite beads for drinking water production”, IOP Conference Series: Materials Science and Engineering, 195 (1), 012004 (2017).
[18]  Nazeran, N. and Moghaddas, J. S., “Synthesis and characterization of silica aerogel reinforced rigid polyurethane foam for thermal insulation application”, Journal of Non-Crystalline Solids, 461, 1 (2017).
[19]  Rezaei, E. and Moghaddas, J. S., “Thermal conductivities of silica aerogel composite insulating material”, Advanced Materials Letters, 7 (4), 296-301, (2016).
[20]  Liu, H., Sha, W., Cooper, A. T. and Fan, M., “Preparation and characterization of a novel silica aerogel as adsorbent for toxic organic compounds”, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 347 (1), 38 (2009).
[21]  Armstrong, F., “Determination of nitrate in water ultraviolet spectrophotometry”, Analytical Chemistry, 35 (9), 1292 (1963).
[22]  Khani, A. and Mirzaei, M., “Comparative study of nitrate removal from aqueous solution using powder activated carbon and carbon nanotubes”, Poceedigs of 2nd International IUPAC Conference on Green Chemistry, Russia, (2008).
[23]  Islam, M., “Development of adsorption media for removal of lead and nitrate from water”, Ph. D. Thesis, National Institute of Technology, Rourkela, (2008).
[24]  Schick, J., Caullet, P., Paillaud, J. -L., Patarin, J. and Mangold-Callarec, C., “Nitrate sorption from water on a surfactant-modified zeolite. fixed-bed column experiments”, Microporous Mesoporous Mater., 142 (2), 549 (2011).
[25]  McCabe, W. L., Smith, J. C. and Harriott, P., Unit operations of chemical engineering, Vol. 5, McGraw-Hill, New York, (1993).
[26]  Thomas, W. J. and Crittenden, B. D., Adsorption technology and design, Butterworth-Heinemann, (1998).
[27]  Mantovaneli, I., Ferretti, E., Simões, M. and Silva, C., “The effect of temperature and flow rate on the clarification of the aqueous stevia-extract in a fixed-bed column with zeolites”, Braz. J. Chem. Eng., 21 (3), 449 (2004).
[28]  Sarawade, P. B., Kim, J. -K., Hilonga, A., Quang, D. V., Jeon, S. J. and Kim, H. T., “Synthesis of sodium silicate-based hydrophilic silica aerogel beads with superior properties: Effect of heat-treatment”, J. Non-Cryst. Solids, 357 (10), 2156 (2011).
[29]  Falahnejad, M., Mousavi, H. Z., Shirkhanloo, H. and Rashidi, A., “Preconcentration and separation of ultra-trace amounts of lead using ultrasound-assisted cloud point-micro solid phase extraction based on amine functionalized silica aerogel nanoadsorbent”, Microchem. J., 125, 236 (2016).
[30]  Sharifzadeh, E., Salami-Kalajahi, M., Hosseini, M. S. and Aghjeh, M. K. R., “A temperature-controlled method to produce Janus nanoparticles using high internal interface systems: Experimental and theoretical approaches”, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 506, 56 (2016).
[31]  Sharifzadeh, E., Salami-Kalajahi, M., Hosseini, M. S. and Aghjeh, M. K. R., “Synthesis of silica Janus nanoparticles by buoyancy effect-induced desymmetrization process and their placement at the PS/PMMA interface”, Colloid. Polym. Sci., 295 (1), 25 (2017).
[32]  Rao, A. P., Rao, A. V. and Pajonk, G., “Hydrophobic and physical properties of the ambient pressure dried silica aerogels with sodium silicate precursor using various surface modification agents”, Appl. Surf. Sci., 253 (14), 6032 (2007).
[33]  Sharifzadeh, E., Salami-Kalajahi, M., Hosseini, M. S., Aghjeh, M. K. R., Najafi, S., Jannati, R. and Hatef, Z., “Defining the characteristics of spherical Janus particles by investigating the behavior of their corresponding particles at the oil/water interface in a Pickering emulsion”, J. Dispersion Sci. Technol., 38 (7), 985 (2017).
[34]  Jeong, A. -Y., Koo, S. -M. and Kim, D. -P., “Characterization of hydrophobic SiO2 powders prepared by surface modification on wet gel”, J. Sol-Gel Sci. Technol., 19 (1), 483 (2000).
[35]  Su, J. F., Shi, J. X., Huang, T. L., Ma, F., Lu, J. S. and Yang, S. F., “Effect of nitrate concentration, pH, and hydraulic retention time on autotrophic denitrification efficiency with Fe(II) and Mn(II) as electron donors”, Water Science and Technology : A Journal of the International Association on Water Pollution Research, 74 (5), 1185 (2016).
[36]  Chatterjee, S., Lee, D. S., Lee, M. W. and Woo, S. H., “Nitrate removal from aqueous solutions by cross-linked chitosan beads conditioned with sodium bisulfate”, J. Hazard. Mater., 166 (1), 508 (2009).
[37]  Jaafari, K., Ruiz, T., Elmaleh, S., Coma, J. and Benkhouja, K., “Simulation of a fixed bed adsorber packed with protonated cross-linked chitosan gel beads to remove nitrate from contaminated water”, Chem. Eng. J., 99 (2), 153 (2004).
[38]  Vasconcelos, H. L., Camargo, T. P., Gonçalves, N. S., Neves, A., Laranjeira, M. C. and Fávere, V. T., “Chitosan crosslinked with a metal complexing agent: Synthesis, characterization and copper (II) ions adsorption”, React. Funct. Polym., 68 (2), 572 (2008).
[39]  Baldrian, P., “Interactions of heavy metals with white-rot fungi”, Enzyme Microb. Technol., 32 (1), 78 (2003).
[40]  Onyango, M. S., Masukume, M., Ochieng, A. and Otieno, F., “Functionalised natural zeolite and its potential for treating drinking water containing excess amount of nitrate”, Water SA, 36 (5), 655 (2010).
[41]  Roosta, M., Ghaedi, M., Shokri, N., Daneshfar, A., Sahraei, R. and Asghari, A., “Optimization of the combined ultrasonic assisted/adsorption method for the removal of malachite green by gold nanoparticles loaded on activated carbon: Experimental design”, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 118, 55 (2014).
[42]  Ghanbarian, S., Kahforoushan, D. and Sahraei, E., “Determination of significant factors in the removal of Cu (II) from aqueous solutions by applying adsorption method: Using factorial design”, Desalin. Water Treat., 57 (18), 8470 (2016).
[43]  Montgomery, D. C., Design and analysis of experiments, John Wiley & Sons, (2008).
[44]  Yuh-Shan, H., “Citation review of Lagergren kinetic rate equation on adsorption reactions”, Scientometrics, 59 (1), 171 (2004).
[45]  Ho, Y. S., “Review of second-order models for adsorption systems”, Journal of Hazardous Materials, 136 (3), 681 (2006).
[46]  Ho, Y. -S. and McKay, G., “Pseudo-second order model for sorption processes”, Process Biochem., 34 (5), 451 (1999).
[47]  Katal, R., Baei, M. S., Rahmati, H. T. and Esfandian, H., “Kinetic, isotherm and thermodynamic study of nitrate adsorption from aqueous solution using modified rice husk”, Journal of Industrial and Engineering Chemistry, 18 (1), 295 (2012).
[48]  Bleam, W. F., Soil and environmental chemistry, Elsevier Science, (2011).
[49]  Ruthven, D. M., Principles of adsorption and adsorption processes, John Wiley & Sons, (1984).
[50]  Senturk, H. B., Ozdes, D., Gundogdu, A., Duran, C. and Soylak, M., “Removal of phenol from aqueous solutions by adsorption onto organomodified Tirebolu bentonite: Equilibrium, kinetic and thermodynamic study”, J. Hazard. Mater., 172 (1), 353 (2009).
[51]  Xing, X., Gao, B. -Y., Zhong, Q. -Q., Yue, Q. -Y. and Li, Q., “Sorption of nitrate onto amine-crosslinked wheat straw: Characteristics, column sorption and desorption properties”, J. Hazard. Mater., 186 (1), 206 (2011).
[52]  Sarin, V., Singh, T. S. and Pant, K., “Thermodynamic and breakthrough column studies for the selective sorption of chromium from industrial effluent on activated eucalyptus bark”, Bioresource Technology, 97 (16), 1986 (2006).
[53]  Salman Tabrizi, N. and Yavari, M., “Fixed bed study of nitrate removal from water by protonated cross-linked chitosan supported by biomass-derived carbon particles”, Journal of Environmental Science and Health, Part A, 1 (2020).
[54]  Kang, J. -K., Lee, S. -C. and Kim, S. -B., “Synthesis of quaternary ammonium-functionalized silica gel through grafting of dimethyl dodecyl [3-(trimethoxysilyl) propyl] ammonium chloride for nitrate removal in batch and column studies”, Journal of the Taiwan Institute of Chemical Engineers, 102, 153 (2019).