Research Article
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Year 2020, Volume: 7 Issue: 3, 883 - 892, 30.10.2020
https://doi.org/10.18596/jotcsa.788852

Abstract

Project Number

-

References

  • 1. Souza C, Majuste D, Dantas MSS, Ciminelli VST. Selective adsorption of gold over copper cyanocomplexes on activated carbon. Hydrometallurgy. 2014;147-148:188-195.
  • 2. Sheel A, Pant D. Recovery of gold from electronic waste using chemical assisted microbial biosorption (hybrid) technique. Bioresour Technol. 2018;247:1189-1192.
  • 3. Chen W, Geng Y, Hong J, Dong H, Cui X, Sun M, Zhang Q. Life cycle assessment of gold production in China. J. Clean Prod. 2018; 179:143-150.
  • 4. Syed S. Recovery of gold from secondary sources-A review. Hydrometallurgy. 2012;115-116:30-51.
  • 5. Cayumil R, Khanna R, Rajarao R, Mukherjee PS, Sahajwalla V. Concentration of precious metals during their recovery from electronic waste. Waste Manage. 2016;57:121-130. 6. Papaiconomou N, Vite G, Goujon N, Lévêque JM, Billard I. Effient removal of gold complexes from water by precipitation or liquid–liquid extraction using ionic liquids. Green Chem. 2012;14:2050-2056.
  • 7. Zhang H, Jeffry CA, Jeffey MI. Ion exchange recovery of gold from iodineiodide solutions. Hydrometallurgy. 2012;125–126:69–75.
  • 8. Xie RF, Hu QF, Yang GY, Chen J, Han YS, Zhao YH, Li Z. Solid-phase extraction gold from alkaline cyanide solution with quaternary ammonium surfactant. Rare Metals. 2016;35:282–288.
  • 9. Urucu OA, Gündüz ZY, Deniz S, Yetimoglu EK, Aydin A. A novel ligand for cloud point extraction to determine gold content in ore samples. Environ. Chem. Lett. 2014;12:449–453. 10. Kashefi K, Tor JM, Nevin KP, Lovley DR. Reductive precipitation of gold by dissimilatory Fe(III)-reducing bacteria and archaea. Appl Environ Microbiol. 2001;67:3275–3279.
  • 11. Awual MR, Khaleque, MA, Ferdows M, Sarwaruddin-Chowdhury AM, Yaita T. Rapid recognition and recovery of gold(III) with functional ligand immobilized novel mesoporous adsorbent. Microchemical J. 2013;110:591–598.
  • 12. Zhang Y, Xu Q, Zhang S, Liu J, Zhou J, Xu H, Xiao H, Li J. Preparation of thiolmodifid Fe3O4@SiO2 nanoparticles and their application for gold recovery from dilute solution. Sep Purif Technol. 2013;116:391–397.
  • 13. Villalobos LF, Yapici T, Peinemann KV. Poly-thiosemicarbazide membrane for gold recovery. Sep. Purif. Technol. 2014;136:94–104.
  • 14. Moradi O, Zare K, Monajjemi M, Yari M, Aghaie H. The studies of equilibrium and thermodynamic adsorption of Pb(II), Cd(II) and Cu(II) ions from aqueous solution onto SWCNTs and SWCNT –COOH surfaces, fullerenes. Fuller. Nanotub. Carbon Nanostructures. 2010;18:285–302.
  • 15. Moradi O, Aghaie M, Zare K, Monajjemi M, Aghaie H. The study of adsorption characteristics Cu2+ and Pb2+ ions onto PHEMA and P(MMA-HEMA) surfaces from aqueous single solution. J Hazard Mater. 2009;170:673-679.
  • 16. Farghali AA, Abdel-Tawab HA, Abdel-Moaty SA, Khaled R. Functionalization of acidifid multi-walled carbon nanotubes for removal of heavy metals in aqueous solutions. J Nanostructure Chem. 2017;7:101–111.
  • 17. Zhang G, Zhou Y, Ding Z, Fu L, Wang S. Nanosilica-supported thiosemicarbazide–glutaraldehyde polymer for selective Au(III) removal from aqueous solution. RSC Advances. 2017;7:55215-55223.
  • 18. Li H, Wang X, Cao L, Zhang X, Yang C. Gold recovery PVDF membrane functionalized with thiosemicarbazide. Chem Eng J. 2015;280:399-408.
  • 19. Lin G, Wang S, Zhang L, Hu T, Peng J, Cheng S, Fu L. Synthesis and evaluation of thiosemicarbazide functionalized corn bract for selective and effient adsorption of Au(III) from aqueous solutions. J Mol Liq. 2018;258:235–243.
  • 20. Mahdiani M, Soofivand F, Ansari F, Salavati-Niasari M. Grafting of CuFe12O19 nanoparticles on CNT and graphene: eco-friendly synthesis, characterization and photocatalytic activity. J Clean Prod. 2018;176:1185–1197.
  • 21. Ansari F, Sobhani A, Salavati-Niasari M. Simple sol–gel synthesis and characterization of new CoTiO3/CoFe2O4 nanocomposite by using liquid glucose, maltose and starch as fuel, capping and reducing agents. J Colloid Interface Sci. 2018;514:723-732.
  • 22. Naguib HM, Ahmed MA, Abo-Shanab ZL. Silane coupling agent for enhanced epoxy-iron oxide nanocomposite. J Mater Res Technol. 2018;7:21-28.
  • 23. Sun Y, Zhang Z, Wong CP. Study on mono-dispersed nano-size silica by surface modification for underfill applications. J Colloid Interface Sci. 2005;292:436–444.
  • 24. Moisala A, Li Q, Kinloch IA, Windle AH. Thermal and electrical conductivity of single-and multi-walled carbon nanotube-epoxy composites. Compos Sci Technol. 2006;66: 1285-1292. 25. Lee JY, Chen C, Cheng H, Li SHY. Adsorption of Pb(II) and Cu(II) metal ions on functionalized large-pore mesoporous silica. Int J Environ Sci Technol. 2016;13:65-76.
  • 26. Mansa RF, Sipaut CS, Rahman IA, Yusof NSM, Jafarzadeh M. Preparation of glycine-modified silica nanoparticles for the adsorption of malachite green dye. J Porous Mater. 2016;23:35–46.
  • 27. Wang L, Cheng C, Tapas S, Lei J, Matsuoka M, Zhang J, Zhang F. Carbon dots modified mesoporous organosilica as an adsorbent for the removal of 2,4-dichlorophenol and heavy metal ions. J Mater Chem A. 2015;3:13357-13364.
  • 28. Zhuang M-Y, Jiang X-P, Ling X-M, Xu M-Q, Zhu Y-H, Zhang Y-W. Immobilization of glycerol dehydrogenase and NADH oxidase for enzymatic synthesis of 1,3-dihydroxyacetone with in situ cofactor regeneration. J Chem Technol Biotechnol. 2018;156:1-10.
  • 29. Dixit CK, Bhakta S, Macharia J, Furtado J, Suib SL, Rusling JF. Novel Epoxy-Silica Nanoparticles to Develop Non-Enzymatic Colorimetric Probe for Analytical Immuno/Bioassays. Anal Chim Acta. 2018;1028:77-85.
  • 30. Chruściel JJ, Leśniak E. Modification of epoxy resins with functional silanes, polysiloxanes, silsesquioxanes, silica and silicates. Prog Polym Sci. 2015;41:67-121.
  • 31. Fırlak M, Kahraman MV, Yetimoğlu EK, Zeytuncu B. Adsorption of Ag (I) ions from aqueous solutions using photocured thiol-ene hydrogel. Sep Purif Technol. 2013;48:2860–2870.
  • 32. He X, Rytöluoto I, Anyszka R, Mahtabani A, Saarimäki E, Lahti K, Paajanen M, Dierkes W, Blume A. Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites. Polymers. 2019;11:1957-1978.
  • 33. Gruian C, Vanea E, Simon S, Simon V. FTIR and XPS studies of protein adsorption onto functionalized bioactive glass. BBA-Proteins Proteom. 2012;1824:873-881.
  • 34. Michel R, Pasche S, Textor M, Castner DG. Influence of PEG architecture on protein adsorption and conformation. Langmuir. 2005;21:12327-12332.
  • 35. Zhao Y, Zou J, Shi W, Tang L. Preparation and characterization of mesoporous silica spheres with bimodal pore structure from silica/hyperbranched polyester nanocomposites. Micropor Mesopor Mat. 2006;92:251-258.
  • 36. Nhavene EPF, Silva WM, Junior RRT, Gastelois PL, Venâncio T, Nascimento R, Batista RJC, Machado CR, Macedo WAA, Sousa EMB. Chitosan grafted into mesoporous silica nanoparticles as benznidazol carrier for Chagas diseases treatment. Micropor Mesopor Mat. 2018;272:265-275.
  • 37. Yu JG, Le Y, Cheng B. Fabrication and CO2 adsorption performance of bimodal porous silica hollow spheres with aminemodifed surfaces. RSC Advances. 2012;2:6784–6791.
  • 38. Feifel SC, Lisdat F. Silica nanoparticles for the layer-by-layer assembly of fully electro-active cytochrome c multilayers. J. Nanobiotechnology. 2011;9:59-71.
  • 39. Ammar S, Ramesh K, Vengadaesvaran B, Ramesh S, Arof AK. Amelioration of anticorrosion and hydrophobic properties of epoxy/PDMS composite coatings containing nano ZnO particles. Prog Org Coat. 2016;92:54-65.
  • 40. Li C, Wan J, Kalali EN, Fan H, Wang D-Y. Synthesis and characterization of functional eugenol derivative based layered double hydroxide and its use as a nanoflame-retardant in epoxy resin. J Mater Chem A. 2015;3:3471-3479.
  • 41. Chen F, Lu Y, Liu X, Song J, He G, Tiwari MK, Carmalt CJ, Parkin, IP. Table Salt as a Template to Prepare Reusable Porous PVDF–MWCNT Foam for Separation of Immiscible Oils/Organic Solvents and Corrosive Aqueous Solutions. Adv Funct Mater. 2017;27:1702926-1702937.
  • 42. Lu L, Pan J, Li G. Recyclable high-performance epoxy based on transesterification reaction. J Mater Chem A. 2017;5:21505-21513.
  • 43. Omurlu C, Baran JR, Nguyen QP. Adsorption of Surface Functionalized Silica Nanoparticles onto Mineral Surfaces and Decane/Water Interface. J Nanopart Res. 2012;14:1246-1256.
  • 44. Baghban N, Yilmaz E, Soylak M. Nanodiamond/MoS2 nanorod composite as a novel sorbent for fast and effective vortex-assisted micro solid phase extraction of lead(II) and copper(II) for their flame atomic absorption spectrometric detection. J Mol Liq. 2017;234: 260-267.
  • 45. Ngatijo-Basuki R, Rusdiarso B, Nuryon N. Sorption-desorption profile of Au(III) onto silica modified quaternary amines (SMQA) in gold mining effluent. J Environ Chem Eng. 2020;8:103747- 103787.
  • 46. Aydın-Urucu O, Aracıer DE, Çakmakçi E. Allylimidazole containing OSTE based photocured materials for selective and efficient removal of gold from aqueous media. Microchem J. 2019;146:997-1003.
  • 47. Beyler-Çiğil A, Aydın-Urucu O, Kahraman MV. Nanodiamond-containing polyethyleneimine hybrid materials for lead adsorption from aqueous media. J Appl Polym. 2019;136:48241-48250.

Preparation, Characterization and Adsorption into Aqueous Solutions of Polyethyleneimine-Coated Silica Nanoparticles

Year 2020, Volume: 7 Issue: 3, 883 - 892, 30.10.2020
https://doi.org/10.18596/jotcsa.788852

Abstract

In this study, polyethyleneimine-coated silica nanoparticles (PEI-SiNP) were used to prepare a polymeric material that can effectively and selectively adsorb Au (III) from aqueous solutions. For this purpose, silica nanoparticles were firstly reacted with (3-glycidyloxypropyl)trimethoxysilane (GPTMS) to achieve epoxy functionality. The structures of the silica nanoparticles (SiNP), silica nanoparticles with epoxy functionality (E-SiNP) and polyethyleneimine-coated silica nanoparticles were determined using ATR-FTIR (Attenuated Total Reflectance Fourier Transform Infrared) and XPS (X-Ray Photoelectron Spectroscopy), while their thermal properties were characterized using thermogravimetric analyses (TGA). The Au (III) ion-binding capacity of the PEI-SiNP adsorbent nanocomposite that contain high levels of imine was investigated. The effects of the interactions between pH, contact time and foreign metal ions on adsorption were tested to determine the optimum conditions. The optimum contact time was 3 hours at pH 2. The adsorption capacity of the adsorbent nanocomposite prepared for Au (III) was found to be 116.27 mg/g. The Langmuir and Freundlich isotherms were used to determine the adsorption behaviors and the Langmuir isotherm model was selected as the best fit model (R2: 0.997). The prepared PEI-SiNP adsorbent nanocomposite showed a high selectivity for the Au (III) metal even when different metal cations such as Cu (II), Cd (II) and Pb (II) were present.

Supporting Institution

Amasya Üniversitesi

Project Number

-

Thanks

-

References

  • 1. Souza C, Majuste D, Dantas MSS, Ciminelli VST. Selective adsorption of gold over copper cyanocomplexes on activated carbon. Hydrometallurgy. 2014;147-148:188-195.
  • 2. Sheel A, Pant D. Recovery of gold from electronic waste using chemical assisted microbial biosorption (hybrid) technique. Bioresour Technol. 2018;247:1189-1192.
  • 3. Chen W, Geng Y, Hong J, Dong H, Cui X, Sun M, Zhang Q. Life cycle assessment of gold production in China. J. Clean Prod. 2018; 179:143-150.
  • 4. Syed S. Recovery of gold from secondary sources-A review. Hydrometallurgy. 2012;115-116:30-51.
  • 5. Cayumil R, Khanna R, Rajarao R, Mukherjee PS, Sahajwalla V. Concentration of precious metals during their recovery from electronic waste. Waste Manage. 2016;57:121-130. 6. Papaiconomou N, Vite G, Goujon N, Lévêque JM, Billard I. Effient removal of gold complexes from water by precipitation or liquid–liquid extraction using ionic liquids. Green Chem. 2012;14:2050-2056.
  • 7. Zhang H, Jeffry CA, Jeffey MI. Ion exchange recovery of gold from iodineiodide solutions. Hydrometallurgy. 2012;125–126:69–75.
  • 8. Xie RF, Hu QF, Yang GY, Chen J, Han YS, Zhao YH, Li Z. Solid-phase extraction gold from alkaline cyanide solution with quaternary ammonium surfactant. Rare Metals. 2016;35:282–288.
  • 9. Urucu OA, Gündüz ZY, Deniz S, Yetimoglu EK, Aydin A. A novel ligand for cloud point extraction to determine gold content in ore samples. Environ. Chem. Lett. 2014;12:449–453. 10. Kashefi K, Tor JM, Nevin KP, Lovley DR. Reductive precipitation of gold by dissimilatory Fe(III)-reducing bacteria and archaea. Appl Environ Microbiol. 2001;67:3275–3279.
  • 11. Awual MR, Khaleque, MA, Ferdows M, Sarwaruddin-Chowdhury AM, Yaita T. Rapid recognition and recovery of gold(III) with functional ligand immobilized novel mesoporous adsorbent. Microchemical J. 2013;110:591–598.
  • 12. Zhang Y, Xu Q, Zhang S, Liu J, Zhou J, Xu H, Xiao H, Li J. Preparation of thiolmodifid Fe3O4@SiO2 nanoparticles and their application for gold recovery from dilute solution. Sep Purif Technol. 2013;116:391–397.
  • 13. Villalobos LF, Yapici T, Peinemann KV. Poly-thiosemicarbazide membrane for gold recovery. Sep. Purif. Technol. 2014;136:94–104.
  • 14. Moradi O, Zare K, Monajjemi M, Yari M, Aghaie H. The studies of equilibrium and thermodynamic adsorption of Pb(II), Cd(II) and Cu(II) ions from aqueous solution onto SWCNTs and SWCNT –COOH surfaces, fullerenes. Fuller. Nanotub. Carbon Nanostructures. 2010;18:285–302.
  • 15. Moradi O, Aghaie M, Zare K, Monajjemi M, Aghaie H. The study of adsorption characteristics Cu2+ and Pb2+ ions onto PHEMA and P(MMA-HEMA) surfaces from aqueous single solution. J Hazard Mater. 2009;170:673-679.
  • 16. Farghali AA, Abdel-Tawab HA, Abdel-Moaty SA, Khaled R. Functionalization of acidifid multi-walled carbon nanotubes for removal of heavy metals in aqueous solutions. J Nanostructure Chem. 2017;7:101–111.
  • 17. Zhang G, Zhou Y, Ding Z, Fu L, Wang S. Nanosilica-supported thiosemicarbazide–glutaraldehyde polymer for selective Au(III) removal from aqueous solution. RSC Advances. 2017;7:55215-55223.
  • 18. Li H, Wang X, Cao L, Zhang X, Yang C. Gold recovery PVDF membrane functionalized with thiosemicarbazide. Chem Eng J. 2015;280:399-408.
  • 19. Lin G, Wang S, Zhang L, Hu T, Peng J, Cheng S, Fu L. Synthesis and evaluation of thiosemicarbazide functionalized corn bract for selective and effient adsorption of Au(III) from aqueous solutions. J Mol Liq. 2018;258:235–243.
  • 20. Mahdiani M, Soofivand F, Ansari F, Salavati-Niasari M. Grafting of CuFe12O19 nanoparticles on CNT and graphene: eco-friendly synthesis, characterization and photocatalytic activity. J Clean Prod. 2018;176:1185–1197.
  • 21. Ansari F, Sobhani A, Salavati-Niasari M. Simple sol–gel synthesis and characterization of new CoTiO3/CoFe2O4 nanocomposite by using liquid glucose, maltose and starch as fuel, capping and reducing agents. J Colloid Interface Sci. 2018;514:723-732.
  • 22. Naguib HM, Ahmed MA, Abo-Shanab ZL. Silane coupling agent for enhanced epoxy-iron oxide nanocomposite. J Mater Res Technol. 2018;7:21-28.
  • 23. Sun Y, Zhang Z, Wong CP. Study on mono-dispersed nano-size silica by surface modification for underfill applications. J Colloid Interface Sci. 2005;292:436–444.
  • 24. Moisala A, Li Q, Kinloch IA, Windle AH. Thermal and electrical conductivity of single-and multi-walled carbon nanotube-epoxy composites. Compos Sci Technol. 2006;66: 1285-1292. 25. Lee JY, Chen C, Cheng H, Li SHY. Adsorption of Pb(II) and Cu(II) metal ions on functionalized large-pore mesoporous silica. Int J Environ Sci Technol. 2016;13:65-76.
  • 26. Mansa RF, Sipaut CS, Rahman IA, Yusof NSM, Jafarzadeh M. Preparation of glycine-modified silica nanoparticles for the adsorption of malachite green dye. J Porous Mater. 2016;23:35–46.
  • 27. Wang L, Cheng C, Tapas S, Lei J, Matsuoka M, Zhang J, Zhang F. Carbon dots modified mesoporous organosilica as an adsorbent for the removal of 2,4-dichlorophenol and heavy metal ions. J Mater Chem A. 2015;3:13357-13364.
  • 28. Zhuang M-Y, Jiang X-P, Ling X-M, Xu M-Q, Zhu Y-H, Zhang Y-W. Immobilization of glycerol dehydrogenase and NADH oxidase for enzymatic synthesis of 1,3-dihydroxyacetone with in situ cofactor regeneration. J Chem Technol Biotechnol. 2018;156:1-10.
  • 29. Dixit CK, Bhakta S, Macharia J, Furtado J, Suib SL, Rusling JF. Novel Epoxy-Silica Nanoparticles to Develop Non-Enzymatic Colorimetric Probe for Analytical Immuno/Bioassays. Anal Chim Acta. 2018;1028:77-85.
  • 30. Chruściel JJ, Leśniak E. Modification of epoxy resins with functional silanes, polysiloxanes, silsesquioxanes, silica and silicates. Prog Polym Sci. 2015;41:67-121.
  • 31. Fırlak M, Kahraman MV, Yetimoğlu EK, Zeytuncu B. Adsorption of Ag (I) ions from aqueous solutions using photocured thiol-ene hydrogel. Sep Purif Technol. 2013;48:2860–2870.
  • 32. He X, Rytöluoto I, Anyszka R, Mahtabani A, Saarimäki E, Lahti K, Paajanen M, Dierkes W, Blume A. Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites. Polymers. 2019;11:1957-1978.
  • 33. Gruian C, Vanea E, Simon S, Simon V. FTIR and XPS studies of protein adsorption onto functionalized bioactive glass. BBA-Proteins Proteom. 2012;1824:873-881.
  • 34. Michel R, Pasche S, Textor M, Castner DG. Influence of PEG architecture on protein adsorption and conformation. Langmuir. 2005;21:12327-12332.
  • 35. Zhao Y, Zou J, Shi W, Tang L. Preparation and characterization of mesoporous silica spheres with bimodal pore structure from silica/hyperbranched polyester nanocomposites. Micropor Mesopor Mat. 2006;92:251-258.
  • 36. Nhavene EPF, Silva WM, Junior RRT, Gastelois PL, Venâncio T, Nascimento R, Batista RJC, Machado CR, Macedo WAA, Sousa EMB. Chitosan grafted into mesoporous silica nanoparticles as benznidazol carrier for Chagas diseases treatment. Micropor Mesopor Mat. 2018;272:265-275.
  • 37. Yu JG, Le Y, Cheng B. Fabrication and CO2 adsorption performance of bimodal porous silica hollow spheres with aminemodifed surfaces. RSC Advances. 2012;2:6784–6791.
  • 38. Feifel SC, Lisdat F. Silica nanoparticles for the layer-by-layer assembly of fully electro-active cytochrome c multilayers. J. Nanobiotechnology. 2011;9:59-71.
  • 39. Ammar S, Ramesh K, Vengadaesvaran B, Ramesh S, Arof AK. Amelioration of anticorrosion and hydrophobic properties of epoxy/PDMS composite coatings containing nano ZnO particles. Prog Org Coat. 2016;92:54-65.
  • 40. Li C, Wan J, Kalali EN, Fan H, Wang D-Y. Synthesis and characterization of functional eugenol derivative based layered double hydroxide and its use as a nanoflame-retardant in epoxy resin. J Mater Chem A. 2015;3:3471-3479.
  • 41. Chen F, Lu Y, Liu X, Song J, He G, Tiwari MK, Carmalt CJ, Parkin, IP. Table Salt as a Template to Prepare Reusable Porous PVDF–MWCNT Foam for Separation of Immiscible Oils/Organic Solvents and Corrosive Aqueous Solutions. Adv Funct Mater. 2017;27:1702926-1702937.
  • 42. Lu L, Pan J, Li G. Recyclable high-performance epoxy based on transesterification reaction. J Mater Chem A. 2017;5:21505-21513.
  • 43. Omurlu C, Baran JR, Nguyen QP. Adsorption of Surface Functionalized Silica Nanoparticles onto Mineral Surfaces and Decane/Water Interface. J Nanopart Res. 2012;14:1246-1256.
  • 44. Baghban N, Yilmaz E, Soylak M. Nanodiamond/MoS2 nanorod composite as a novel sorbent for fast and effective vortex-assisted micro solid phase extraction of lead(II) and copper(II) for their flame atomic absorption spectrometric detection. J Mol Liq. 2017;234: 260-267.
  • 45. Ngatijo-Basuki R, Rusdiarso B, Nuryon N. Sorption-desorption profile of Au(III) onto silica modified quaternary amines (SMQA) in gold mining effluent. J Environ Chem Eng. 2020;8:103747- 103787.
  • 46. Aydın-Urucu O, Aracıer DE, Çakmakçi E. Allylimidazole containing OSTE based photocured materials for selective and efficient removal of gold from aqueous media. Microchem J. 2019;146:997-1003.
  • 47. Beyler-Çiğil A, Aydın-Urucu O, Kahraman MV. Nanodiamond-containing polyethyleneimine hybrid materials for lead adsorption from aqueous media. J Appl Polym. 2019;136:48241-48250.
There are 44 citations in total.

Details

Primary Language English
Journal Section Articles
Authors

Aslı Beyler Çiğil 0000-0003-4353-4224

Project Number -
Publication Date October 30, 2020
Submission Date September 1, 2020
Acceptance Date October 20, 2020
Published in Issue Year 2020 Volume: 7 Issue: 3

Cite

Vancouver Beyler Çiğil A. Preparation, Characterization and Adsorption into Aqueous Solutions of Polyethyleneimine-Coated Silica Nanoparticles. JOTCSA. 2020;7(3):883-92.