Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite

Salah Abo-El-Enein; Yahia Gedamy; Amr Ecresh

doi:doi:10.11648/j.am.20170606.11

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Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite

Salah Abo-El-Enein, Yahia Gedamy, Amr Ecresh

Published in Advances in Materials (Volume 6, Issue 6)

Received: 16 March 2017 Accepted: 12 April 2017 Published: 26 October 2017

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Abstract

In the present work, the hydroxyapatite/alginate nano-composite adsorbent was prepared by incorporating nano-sized hydroxyapatite (nHAp) into alginate polymer and uses this adsorbent for removal of nitrate from groundwater. The synthesized nano-composite and pure alginate as well as the pure hydroxyapatite were characterized with Fourier Transform Infrared (FT-IR) spectroscopy to ascertain the functional groups. The adsorption characteristics of nitrate from groundwater on the HAp/Alg nano-composite were optimized under different operational parameters like contact time, pH, adsorbent dosage, initial concentration of nitrate and temperature in batch system. Maximum equilibrium capacity reached 99% of nitrate removal by using the HAp/Alg nano-composite after 240min at pH 3; adsorbent dosage, 2g; initial concentration, 100mg/l and temperature, 20°C. The kinetics studies revealed that the pseudo-second-order kinetic model was able to describe the dynamic behavior of the adsorption process by composite adsorbents used in this work. Also, the Langmuir isotherm model is very well fitted to the equilibrium data. The mechanism of NO₃^- ions adsorption by the nano-composite adsorbent was described. So, it is concluded that HAp/Alg nano-composite is a relatively efficient and low cost as well as the results validated the feasibility of HAp/Alg nano-composite for highly effective removal of nitrate from an aqueous solution.

Published in	Advances in Materials (Volume 6, Issue 6)
DOI	10.11648/j.am.20170606.11
Page(s)	102-114
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Nitrate, Hydroxyapatite/Alginate Nano-Composite, Groundwater

References

[1]	Akçelik, O.; Tosun, A. and Ergun, M., 2008. Biosorption of copper (ii) from aqueous solution by Saccharomyces cerevisiae, 4^th European Bioremediation Conference, Greece.
[2]	ALDAR, CH2M Hill, Spain, 2011. Study of environmental and social impact assessment framework (ESIAF) of Assiut & Sohag governorates. Executive Summary, Egypt, 82p.
[3]	Annadurai, G. and Krishnan M. R. V., 1996. Adsorption of basic dye using chitin. Indian J Environ Protec. 16 (6): 444-449.
[4]	Arica, M. Y.; Arpa, C.; Ergene, A.; Bayramoglu, G. and Genc, O., 2003. Ca–alginate as a support for Pb(II) and Zn(II) biosorption with immobilized Phanerochaete chrysosporium, Carbohydr. Polym., 52: 167–174.
[5]	Cantor, K. P., 1997. Drinking water and cancer. Cancer Causes Control, 8: 292–308.
[6]	Census estimation, 2015. Estimation of Central Agency for Public Mobilization and Statistics, 2015 (in Arabic).
[7]	Do˘ gan, M. and Alkan, M., 2003. Adsorption kinetics of methyl violet onto perlite. Chemosphere, 50 (4), 517-528.
[8]	Dorsche, M. M.; Scragg, R. K. R.; McMichael, A. J.; Baghurst, P. A. and Duer, K. F., 1984. Congenital malformation and maternal drinking water supplying rural South Australia: a case study. Am. J. Epidemiol., 119: 473–486.
[9]	Elmoubarki, R.; Mahjoubi, F. Z.; Tounsadi, H.; Moustadraf, J.; Abdennouri, M.; Zouhri, A.; ElAlbani, A. and Barka, N., 2015. Adsorption of textile dyes on raw and decanted Moroccan clays: Kinetics, Equilibrium and Thermodynamics. Water Resources and Industry, 9: 16-29.
[10]	Fahimeh Googerdchian; Ahmad Moheb and Rahmatollah Emadi, 2012. Lead sorption properties of nanohydroxyapatite–alginate composite adsorbents. Chemical Eng. J., 200, 202: 471–479.
[11]	Ganjali, M. R.; Babaei, L. H.; Norouzi, P.; Pourjavid, M. R.; Badiei, A.; Saberyan, K.; Maragheh, M. G.; Salavati-Niasari, M. and Ziarani, G. M., 2005. Novel method for the fast separation and purification of molybdenum (VI) from fission products of uranium with aminofunctionalized mesoporous molecular sieves (AMMS) modified by dicyclohexyl-18-crown-6 and S-N tetradentate Schiff’s base. Analytical Letters, 38 (11): 1813–1821.
[12]	Grant, G. T.; Morris, E. R.; Rees, D. A.; Smith, P. J. and Thom, D., 1973. Biological interaction between polysaccharides and di-valent cations. The egg-box model. FEBS Lett, 32: 195–198.
[13]	Hekmatzadeh, A. A.; Karimi-Jashani, A.; Talebbeydokhti, N. and Kløve, B., 2012. Modeling of nitrate removal for ion exchange resin in batch and fixed bed experiments, J. Desalination, 284: 22–31.
[14]	Ho, Y. S. and McKay, G., 1999. Pseudo-second order model for sorption processes, Process Biochem. 34: 451–465.
[15]	Ho, Y.; Porter, J. and McKay, G., 2002. Equilibrium isotherm studies for the sorption of divalent metal ions onto peat: copper, nickel and lead single component systems. Water, Air & Soil Pollution, 141 (1–4): 1–33.
[16]	Honghe, Z., 1997. Interaction mechanism in sol–gel transition of alginate solutions by addition of divalent cations. Carbohydr. Res., 302: 97–101.
[17]	Ingleton, I. and Simmons, P., 1996. Factors affecting silver biosorption by an industrial strain of Saccharomyces cerevisiae. J. Chem. Technol. Biotechnol., 65: 21-28.
[18]	Islam, M. and Patel, R., 2011. Physicochemical characterization and adsorption behavior of Ca/Al chloride hydrotalcite - like compound towards removal of nitrate. J. Hazard. Mater. 190: 659-668.
[19]	Jae-HeeAhn; Kwang-Ho Choo and Hak-Soon Park, 2008. Reverse osmosis membrane treatment of acidic etchant wastewater: Effect of neutralization and polyelectrolyte coating on nitrate removal, J. Membrane Sci., 310: 296–302.
[20]	Kapoor, A. and Viraraghavan, T., 1997. Nitrate removal from drinking water—review. J. Environ. Eng., 123: 371 – 380.
[21]	Kar, S.; Khan, D. K. and Santra, S. C., 2002. Groundwater nitrate concentration and its impact on human health: a review. Every man’s Sci., 37: 35–40.
[22]	Kesseru, P.; Kiss, I.; Bihari, Z. and Polyak, B., 2002. Investigation of the denitrification activity of immobilized Pseudomonas butanovora cells in the presence of different organic substrates. Water Res., 36: 1565–1571.
[23]	Kikuchi, M.; Itoh, S.; Ichinose, S.; Shinomiya, K. and Tanaka, J., 2001. Self-organization mechanism in a bone-like hydroxyapatite / collagen nano-composite synthesized in vitro and its biological reaction in vivo. Biomaterials, 22: 1705–1711.
[24]	Komath, M. and Varma, H. K., 2003. Development of a fully injectable calcium phosphate cement for orthopedic and dental applications. Bull. Mater. Sci., 26 (4): 415-422.
[25]	Mahamudur Islam; Prakash Chandra Mishra and Rajkishore Patel, 2010. Physicochemical characterization of hydroxyapatite and its application towards removal of nitrate from water. J. Environ. Manage., 91: 1883-1891.
[26]	Malberg, J. W.; Savage, E. P. and Osteryoung, J., 1978. Nitrate in drinking water and the early onset of hypertension. Environ. Pollut., 15: 155–161.
[27]	McKay, G., 1983. The adsorption of dye stuﬀ from aqueous solution using activated carbon: analytical solution for batch adsorption based on external mass transfer and pore diﬀusion. Chem. Eng. J., 27:187.
[28]	McKay, G.; Otterburn, M. S. and Aja, J. A., 1985. Fullter’s earth and ﬁred clay as adsorbents for dyes stuﬀs. Water Air Soil Pollut. 24: 307.
[29]	Mishra, P. C. and Patel, R. K., 2009. Use of agricultural waste for the removal of nitrate-nitrogen from aqueous medium, J. Environ. Manage., 90: 519-522.
[30]	Mohammad Hassan Shahmoradi; Behnoush Amin Zade; Ali Torabian and Mahdi Seyed Salehi, 2015. Removal of nitrate from groundwater using activated carbon prepared from rice husk and sludge of paper industry wastewater treatment. ARPN J. Eng. and Applied Sci., 10 (17): 7856-7863.
[31]	Morey, M. S.; O’Brien, S.; Schwarz, S. and Stucky, G. D., 2000. Hydrothermal and post-synthesis surface modification of cubic, MCM-48 and ultra large pore SBA-15 mesoporous silica with titanium. Chemi. of Materi. J., 12 (4): 898–911.
[32]	Moussavi, G. and Khosravi, R., 2011. The removal of cationic dyes from aqueous solutions by adsorption onto Pistachio Hull Waste. Chemical Eng. Res. and Design J., 89: 2182-2189.
[33]	Nayak, D. and Lahiri, S., 2006. Biosorption of toxic, heavy, no-carrier-added radionuclides by calcium alginate beads, J. Radioanal. Nucl. Chem., 267: 59–65.
[34]	Prakasa Rao, E. V. S. and Puttanna, K., 2000. Nitrates, agriculture and environment. Current Sci., 79: 1163–1168.
[35]	Ravikrishna, R.; Ren, M. and Valsaraj, K. T., 2006. Low-temperature synthesis of porous hydroxyapatite scaffolds using polyaphron templates, J. Sol–Gel Sci. Technol., 38: 203–210.
[36]	Ruiz-Hitzky, E., 2003. Functionalizing inorganic solids: towards organic–inorganic nanostructured materials for intelligent and bio-inspired systems. The Chemical Record, 88–100.
[37]	Ryker, S. J. and Jones, J. L., 1995. Nitrate concentrations in groundwater of the central Columbia plateau. U.S. Geological Survey Fact Sheet, FS-061-97.
[38]	Sachin N. Milmile; Jayshri V. Pande; Shilpi Karmakar; Amit Bansiwal; Tapan Chakrabarti and Rajesh B. Biniwale, 2011. Equilibrium isotherm and kinetic modeling of the adsorption of nitrates by anion exchange Indion NSSR resin, Desalination, 276: 38–44.
[39]	Sefner, W., 1995. Natural water contents and endemic goiter—a review. Zentralb. Hyg. Umweltmed., 196: 381–398.
[40]	Selvam, P.; Bhatia, S. K. and Sonwane, C. G., 2001. Recent advances in processing and characterization of periodic mesoporous MCM-41 silicate molecular sieves. Indus. & Eng. Chemi. Res. J., 40 (15): 3237–3261.
[41]	Sheridan, M. H.; Shea, L. D.; Peters, M. C. and Mooney, D. J., 2000. Bioabsorbable polymer scaffolds for tissue engineering capable of sustained growth factor delivery. J. Control Release, 64: 91–102.
[42]	Soumya, G. N.; Manickavasagam, M.; Santhanam, P.; Dinesh Kumar, S. and Prabhavathi, P., 2015. Removal of phosphate and nitrate from aqueous solution using seagrass Cymodocea rotundata beads. African J. Biotechno. 14 (16): 1393-1400.
[43]	Sudipta Chatterjee; Dae S. Leeb; Min W. Leec and Seung H. Woo., 2009. Nitrate removal from aqueous solutions by cross-linked chitosan beads conditioned with sodium bisulfate, J. Hazard. Mater., 166: 508–513.
[44]	Super, M.; Heese, H.; Machenzie, D.; Dempster, W. S.; Duplers, J. and Ferreina, J. J., 1981. An epidemiological study of well water nitrates in a group of southwest African/Namibian infants. Water Res., 15: 1265–1270.
[45]	Sutherland, I. W., 1991. Alginates. In: Byron D, editor. Biomaterials: novel materials from biological sources. New York: Stockton Press, 309–331.
[46]	Suriyaraj, S. P. and R. Selvakumar, 2016. Advances in nanomaterial based approaches for enhanced fluoride and nitrate removal from contaminated water. RSC Adv., 6: 10565-10583.
[47]	Tahir, H., 2005. Comparative trace metal contents in sediments and liquid waste from tanneries and their removal of chromium using Zeolite-5A. Electronic J. Environ., Agricultural and Food Chemistry, EJEAFCHE 4 (4): 1021-1032.
[48]	Teng, S.; Shi, J.; Peng, B. and Chen, L., 2006. The effect of alginate addition on the structure and morphology of hydroxyapatite gelatin nano-composites. Compos. Sci. Technol., 66:1532–1538.
[49]	Van Maanen, J. M. S.; Van Dijk, A.; Mulder, K.; De Baets, M. H.; Menheere, P. C. A.; Van Der Heide, D.; Mertens, P. L. J. M. and Kleinjans, J. C. S., 1994. Consumption of drinking water with high nitrate levels causes hypertrophy of the thyroid. Toxicol. Lett., 72: 365–374.
[50]	Vimonses, V.; Lei, S.; Jin, B.; Chow, C. W. K. and Saint, C., 2009. Adsorption of Congo Red by three Australian kaolin's. Applied Clay Sci. J., 43: 465-472.
[51]	Wahab, M. A.; Jellali, S. and Jedidi, N., 2010. Effect of temperature and pH on the biosorption of ammonium onto Posidonia oceanica fibers: Equilibrium, and kinetic modeling studies. Bioresour. Technol., 101: 8606-8615.
[52]	Wang, Z.; Zhang, Q.; Konno, M. and Saito, S., 1993. Sol-gel transition of alginate solution by the addition of various divalent cations: ¹³C-NMR spectroscopic study. Biopolymers, 33:703–711.
[53]	Wang, Li.; Yue, Li. and Chunzhong, Li., 2009. In situ processing and properties of nanostructured hydroxyapatite / alginate composite. J. Nanopart. Res., 11: 691–699.
[54]	Weber, Jr. W. J., 1972. Physico-chemical processes for water quality control. New York: Wiley Interscience, 27: (Chapter 5) 207–234.
[55]	Weber, W. J. and Morris, J. C., 1964. In: Eckenfelder, W. W, editor. Advances in water pollution research. Oxford: Pergamom Press.
[56]	WHO, 2011. Guidelines for drinking-water quality. Recommendations. 4^th ed. Geneva, World Health Organization. ISBN 978 92 4 154815 1.
[57]	Yadav, A. K.; Kaushik, C. P.; Haritash, A. K.; Kansal, A. and Rani, N., 2006. Defluoridation of groundwater using brick powder as an adsorbent. J. Hazard. Mater. 128: 289-293.
[58]	Yuh-Shan Ho., 2005. Comment on “Nitrate removal from aqueous solution by adsorption onto various materials” by N. O¨ ztu¨rk, T. E. Bektas, J. Hazard. Mater., B, 118: 253–254.
[59]	Zhang, J.; Wang, Q. and Wang, A., 2010. In situ generation of sodium alginate/hydroxyapatite nano-composite beads as drug-controlled release matrices. Acta Biomaterial, 6: 445–454.

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Salah Abo-El-Enein, Yahia Gedamy, Amr Ecresh. (2017). Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite. Advances in Materials, 6(6), 102-114. https://doi.org/10.11648/j.am.20170606.11

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Salah Abo-El-Enein; Yahia Gedamy; Amr Ecresh. Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite. Adv. Mater. 2017, 6(6), 102-114. doi: 10.11648/j.am.20170606.11

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AMA Style

Salah Abo-El-Enein, Yahia Gedamy, Amr Ecresh. Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite. Adv Mater. 2017;6(6):102-114. doi: 10.11648/j.am.20170606.11

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@article{10.11648/j.am.20170606.11,
  author = {Salah Abo-El-Enein and Yahia Gedamy and Amr Ecresh},
  title = {Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite},
  journal = {Advances in Materials},
  volume = {6},
  number = {6},
  pages = {102-114},
  doi = {10.11648/j.am.20170606.11},
  url = {https://doi.org/10.11648/j.am.20170606.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20170606.11},
  abstract = {In the present work, the hydroxyapatite/alginate nano-composite adsorbent was prepared by incorporating nano-sized hydroxyapatite (nHAp) into alginate polymer and uses this adsorbent for removal of nitrate from groundwater. The synthesized nano-composite and pure alginate as well as the pure hydroxyapatite were characterized with Fourier Transform Infrared (FT-IR) spectroscopy to ascertain the functional groups. The adsorption characteristics of nitrate from groundwater on the HAp/Alg nano-composite were optimized under different operational parameters like contact time, pH, adsorbent dosage, initial concentration of nitrate and temperature in batch system. Maximum equilibrium capacity reached 99% of nitrate removal by using the HAp/Alg nano-composite after 240min at pH 3; adsorbent dosage, 2g; initial concentration, 100mg/l and temperature, 20°C. The kinetics studies revealed that the pseudo-second-order kinetic model was able to describe the dynamic behavior of the adsorption process by composite adsorbents used in this work. Also, the Langmuir isotherm model is very well fitted to the equilibrium data. The mechanism of NO3- ions adsorption by the nano-composite adsorbent was described. So, it is concluded that HAp/Alg nano-composite is a relatively efficient and low cost as well as the results validated the feasibility of HAp/Alg nano-composite for highly effective removal of nitrate from an aqueous solution.},
 year = {2017}
}

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TY  - JOUR
T1  - Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite
AU  - Salah Abo-El-Enein
AU  - Yahia Gedamy
AU  - Amr Ecresh
Y1  - 2017/10/26
PY  - 2017
N1  - https://doi.org/10.11648/j.am.20170606.11
DO  - 10.11648/j.am.20170606.11
T2  - Advances in Materials
JF  - Advances in Materials
JO  - Advances in Materials
SP  - 102
EP  - 114
PB  - Science Publishing Group
SN  - 2327-252X
UR  - https://doi.org/10.11648/j.am.20170606.11
AB  - In the present work, the hydroxyapatite/alginate nano-composite adsorbent was prepared by incorporating nano-sized hydroxyapatite (nHAp) into alginate polymer and uses this adsorbent for removal of nitrate from groundwater. The synthesized nano-composite and pure alginate as well as the pure hydroxyapatite were characterized with Fourier Transform Infrared (FT-IR) spectroscopy to ascertain the functional groups. The adsorption characteristics of nitrate from groundwater on the HAp/Alg nano-composite were optimized under different operational parameters like contact time, pH, adsorbent dosage, initial concentration of nitrate and temperature in batch system. Maximum equilibrium capacity reached 99% of nitrate removal by using the HAp/Alg nano-composite after 240min at pH 3; adsorbent dosage, 2g; initial concentration, 100mg/l and temperature, 20°C. The kinetics studies revealed that the pseudo-second-order kinetic model was able to describe the dynamic behavior of the adsorption process by composite adsorbents used in this work. Also, the Langmuir isotherm model is very well fitted to the equilibrium data. The mechanism of NO3- ions adsorption by the nano-composite adsorbent was described. So, it is concluded that HAp/Alg nano-composite is a relatively efficient and low cost as well as the results validated the feasibility of HAp/Alg nano-composite for highly effective removal of nitrate from an aqueous solution.
VL  - 6
IS  - 6
ER  -

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Author Information

Salah Abo-El-Enein

Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
Yahia Gedamy

Hydrogeochemistry Department, Desert Research Center, Cairo, Egypt
Amr Ecresh

North and South Sinai Company for Water and Wastewater, Sinai Peninsula, Egypt

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APA Style

Salah Abo-El-Enein, Yahia Gedamy, Amr Ecresh. (2017). Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite. Advances in Materials, 6(6), 102-114. https://doi.org/10.11648/j.am.20170606.11

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ACS Style

Salah Abo-El-Enein; Yahia Gedamy; Amr Ecresh. Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite. Adv. Mater. 2017, 6(6), 102-114. doi: 10.11648/j.am.20170606.11

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AMA Style

Salah Abo-El-Enein, Yahia Gedamy, Amr Ecresh. Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite. Adv Mater. 2017;6(6):102-114. doi: 10.11648/j.am.20170606.11

Copy | Download

@article{10.11648/j.am.20170606.11,
  author = {Salah Abo-El-Enein and Yahia Gedamy and Amr Ecresh},
  title = {Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite},
  journal = {Advances in Materials},
  volume = {6},
  number = {6},
  pages = {102-114},
  doi = {10.11648/j.am.20170606.11},
  url = {https://doi.org/10.11648/j.am.20170606.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20170606.11},
  abstract = {In the present work, the hydroxyapatite/alginate nano-composite adsorbent was prepared by incorporating nano-sized hydroxyapatite (nHAp) into alginate polymer and uses this adsorbent for removal of nitrate from groundwater. The synthesized nano-composite and pure alginate as well as the pure hydroxyapatite were characterized with Fourier Transform Infrared (FT-IR) spectroscopy to ascertain the functional groups. The adsorption characteristics of nitrate from groundwater on the HAp/Alg nano-composite were optimized under different operational parameters like contact time, pH, adsorbent dosage, initial concentration of nitrate and temperature in batch system. Maximum equilibrium capacity reached 99% of nitrate removal by using the HAp/Alg nano-composite after 240min at pH 3; adsorbent dosage, 2g; initial concentration, 100mg/l and temperature, 20°C. The kinetics studies revealed that the pseudo-second-order kinetic model was able to describe the dynamic behavior of the adsorption process by composite adsorbents used in this work. Also, the Langmuir isotherm model is very well fitted to the equilibrium data. The mechanism of NO3- ions adsorption by the nano-composite adsorbent was described. So, it is concluded that HAp/Alg nano-composite is a relatively efficient and low cost as well as the results validated the feasibility of HAp/Alg nano-composite for highly effective removal of nitrate from an aqueous solution.},
 year = {2017}
}

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TY  - JOUR
T1  - Nitrate Removal from Groundwater Using Sodium Alginate Doped with Nano-Hydroxyapatite
AU  - Salah Abo-El-Enein
AU  - Yahia Gedamy
AU  - Amr Ecresh
Y1  - 2017/10/26
PY  - 2017
N1  - https://doi.org/10.11648/j.am.20170606.11
DO  - 10.11648/j.am.20170606.11
T2  - Advances in Materials
JF  - Advances in Materials
JO  - Advances in Materials
SP  - 102
EP  - 114
PB  - Science Publishing Group
SN  - 2327-252X
UR  - https://doi.org/10.11648/j.am.20170606.11
AB  - In the present work, the hydroxyapatite/alginate nano-composite adsorbent was prepared by incorporating nano-sized hydroxyapatite (nHAp) into alginate polymer and uses this adsorbent for removal of nitrate from groundwater. The synthesized nano-composite and pure alginate as well as the pure hydroxyapatite were characterized with Fourier Transform Infrared (FT-IR) spectroscopy to ascertain the functional groups. The adsorption characteristics of nitrate from groundwater on the HAp/Alg nano-composite were optimized under different operational parameters like contact time, pH, adsorbent dosage, initial concentration of nitrate and temperature in batch system. Maximum equilibrium capacity reached 99% of nitrate removal by using the HAp/Alg nano-composite after 240min at pH 3; adsorbent dosage, 2g; initial concentration, 100mg/l and temperature, 20°C. The kinetics studies revealed that the pseudo-second-order kinetic model was able to describe the dynamic behavior of the adsorption process by composite adsorbents used in this work. Also, the Langmuir isotherm model is very well fitted to the equilibrium data. The mechanism of NO3- ions adsorption by the nano-composite adsorbent was described. So, it is concluded that HAp/Alg nano-composite is a relatively efficient and low cost as well as the results validated the feasibility of HAp/Alg nano-composite for highly effective removal of nitrate from an aqueous solution.
VL  - 6
IS  - 6
ER  -

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