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The Effects of Sodium Chloride in the Formation of Size and Shape of Gold (Au)Nanoparticles by Microwave-Polyol Method for Mercury Adsorption

Authors: Mawarni F. Mohamad, Khairul S.N. Kamarudin, Nik N.F.N.M. Fathilah, Mohamad M. Salleh

Abstract:

Mercury is a natural occurring element and present in various concentrations in the environment. Due to its toxic effects, it is desirable to research mercury sensitive materials to adsorb mercury. This paper describes the preparation of Au nanoparticles for mercury adsorption by using a microwave (MW)-polyol method in the presence of three different Sodium Chloride (NaCl) concentrations (10, 20 and 30 mM). Mixtures of spherical, triangular, octahedral, decahedral particles and 1-D product were obtained using this rapid method. Sizes and shapes was found strongly depend on the concentrations of NaCl. Without NaCl concentration, spherical, triangular plates, octahedral, decahedral nanoparticles and 1D product were produced. At the lower NaCl concentration (10 mM), spherical, octahedral and decahedral nanoparticles were present, while spherical and decahedral nanoparticles were preferentially form by using 20 mM of NaCl concentration. Spherical, triangular plates, octahedral and decahedral nanoparticles were obtained at the highest NaCl concentration (30 mM). The amount of mercury adsorbed using 20 ppm mercury solution is the highest (67.5 %) for NaCl concentration of 30 mM. The high yield of polygonal particles will increase the mercury adsorption. In addition, the adsorption of mercury is also due to the sizes of the particles. The sizes of particles become smaller with increasing NaCl concentrations (size ranges, 5- 16 nm) than those synthesized without addition of NaCl (size ranges 11-32 nm). It is concluded that NaCl concentrations affects the formation of sizes and shapes of Au nanoparticles thus affects the mercury adsorption.

Keywords: Adsorption, Au Nanoparticles, Mercury, SodiumChloride.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1062740

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References:


[1] R. Ebinghaus, R.M. Tripathi, D. Wallschlager and S.E. Lindberg, 1999. Natural and anthropogenic mercury sources and their impact on the airsurface exchange of mercury on regional and global scales. In: Ebinghaus, R., R.R. Turner, L.D. de Lacerda., O. Vasiliev and W. Solomons, Editors, 1999. Mercury contaminated sites-characterization, risk assessment and remediation, Springer, Heidelberg, pp. 3-50. G.K. Darbha, A. Ray and P.C. Ray, "Gold nanoparticle-based miniaturized nanomaterial surface energy transfer probe for rapid and ultrasensitive detection of mercury in soil, water and fish," J. Am. Chem. Soc., vol. 1, pp. 208-214, Oct. 2007.
[3] Tsuji, M., M. Hashimoto, Y. Nishizawa and T. Tsuji, "Preparation of gold nanoplates by a microwave-polyol method," Chem. Lett., vol. 32, pg. 1114, 2003.
[4] K.S.N. Kamarudin, K.S.N and M.F. Mohamad, "Synthesis of gold (Au) nanoparticles for mercury adsorption," Am. J. Applied. Sci., vol. 7, pp. 835-839, 2010.
[5] M.F. Mohamad, K.S.N. Kamarudin, N.N.F.N.M. Fathilah and M.S. Mohamed, "Effects of PVP concentration on the formation of size and shape of gold (Au) nanoparticles for mercury adsorption," J. Applied Sci., vol. 10, pp. 3374-3378, Oct. 2010.
[6] M. Tsuji, M. Hashimoto, Y. Nishizawa and T. Tsuji, "Synthesis of gold nanorods and nanowires by microwave-polyol method," Mater. Lett., vol. 58, pp. 2326-2330, Dec. 2004.
[7] S.H. Im, Y.T. Lee, B. Wiley and Y. Xia, "Large-scale synthesis of silver nanocubes: The role of HCl in promoting cube perfection and monodispersity," Angew. Chem. Int. Ed., vol. 44, pp. 2154-2157, Mar. 2005.
[8] B. Wiley, T. Herricks, Y. Sun and Y. Xia, "Polyol synthesis of silver nanoparticles: Use of chloride and oxygen to promote the formation of single-crystal, truncated cubes and tetrahedrons," Nano Lett., vol. 4, pp. 1733-1730, Aug. 2004.
[9] Y. Sun and Y.J. Xia, "Mechanistic study on the replacement reaction between silver nanostructures and Chloroauric acid in the aqueous medium," Am. Chem. Soc., vol. 126, pp. 3892-3901, Mar. 2004.
[10] B. Wiley, Y. Sun and Y. Xia, "Polyol synthesis of silver nanostructures: Control of product morphology with Fe(II) or Fe(III) species," Langmuir, vol. 21, pp. 8077-8080, Aug. 2005.
[11] A. Henglein, "Radiolytic preparation of ultrafine colloidal gold particles in aqueous solution: Optical spectrum, controlled growth, and some chemical reactions," Langmuir, vol. 15, pp. 6738-6744, July. 1999.
[12] I. Pastoriza-Santos and L.M. Liz-Marzan, "Formation of PVP-protected metal nanoparticles in DMF," Langmuir, vol. 18, pp. 2888-2894, Feb. 2002.
[13] N. Malikova, I. Pastoriza-Santos, M. Schierhom, N.A. Kotov and L.M. Liz-Marzan, "Layer-by-layer assembled mixed spherical and planar gold nanoparticles: Control of interparticle interactions," Langmuir, vol. 18, pp. 3694-3697, Mar. 2002.