PREPARATION OF ZEROVALENT ALUMINIUM NANOPARTICLES AT ROOM TEMPERATURE AND USES THEREOF

WIPO Patent Application WO/2019/057262

A1

The invention relates to the preparation of particles of nano zerovalent aluminium (nZVAl) by chemically reducing a salt thereof by means of sodium borohydride, which is the first experiment for preparing nZVAl particles in this way, using reaction conditions such as the reactant arrival rate and concentrating both the reducing agent and the identified aluminium salt as reactants. The particles of nZVAl prepared under different preparation conditions are identified by the morphological shape, crystallisation, qualitative surface area, intended sedimentation rates and sedimentation volume, and also by visually observing the nZVAl particles react with the acid. The morphological shape, internal composition and size of the nZVAl particles are studied using field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM) and atomic force microscopy (AFM). These techniques showed that most of the prepared aluminium particles appeared round with diameters between 10 nm and 10nm, which is consistent with calculations and practical results obtained using X-ray diffraction (XRD) and AFM testing. Dynamic light scattering (DLS) measurements were taken to determine the hydrodynamic diameter of the particles in liquid suspensions, providing a very broad size distribution in the range of 0.4-1000 nm. The nZVAl particles formed were also tested using ultraviolet–visible spectrophotometry (UV–Vis). A supercrest was recorded at a wavelength of 204 nm=λmax in addition to two crests at wavelengths of λ=369.7 nm and λ=204 nm, respectively, which indicate nZVAl particles. The nZVAl particles also underwent several thermal analyses, such as differential thermal analysis (DTA) and thermal gravimetric analysis (TGA), and XRD studies confirmed that four crests corresponding to pure aluminium were observed and that the average size of the nZVAl particles was close to 34 nm. A Fourier-transform infrared (FTIR) spectrum representing nZVAl particles provided data on functional groups, and five crests exhibited absorption at different wavelengths. The metal composition of the nZVAl particles prepared was studied by means of X-ray fluorescence (XRF) testing. The sediment resulting from the molar ratio 1:10 had good purity and largely comprised nZVAl particles. This is consistent with the results of other analyses. The activity of the prepared nZVAl particles was tested, as was the effectiveness of nZVAl in removing different pollutants from liquid solutions, including organic pollutants such as methylene blue dye, and inorganic pollutants such as heavy metals like copper. The chemically prepared nZVAl was shown to be highly effective in removing these pollutants.

SADEK AHMED HAMDY SAAD EL-DIN (EG)
MOSTAFA MOHAMED (EG)

PCT/EG2017/000029

March 28, 2019

October 12, 2017

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SADEK AHMED HAMDY SAAD EL DIN (EG)
MOSTAFA MOHAMED (EG)

C01B6/19; C01D13/00; C01F7/00; C01F7/38

WOO-SEUK SONG, HYE-SEUNG LEE, JU CHUL LEE, DONG SEON JANG, YOONYOUNG CHOI, MOONGOO CHOI, HEESUN YANG: "Amine-derived synthetic approach to color-tunable InP/ZnS quantum dots with high fluorescent qualities", JOURNAL OF NANOPARTICLE RESEARCH, SPRINGER NETHERLANDS, vol. 15, no. 6, 1 June 2013 (2013-06-01), XP055206532, ISSN: 13880764, DOI: 10.1007/s11051-013-1750-y
AYESHA KAHN ET AL.: "A chemical reduction approach to the synthesis of copper nanoparticles", INTERNATIONAL NANO LETTERS, vol. 6, no. 1, 9 November 2015 (2015-11-09), pages 21 - 26, XP055694057, DOI: 10.1007/s40089-015-0163-6

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