Abstract
This study evaluated the simple methods to improve the sorptional capability of polymeric sorbent to gold (III) ions. The polymeric sorbents have been synthesized by a chemical modification of dithizone phosphorchlorinated PB. The structure and composition of functional polymers are studied by IR spectroscopy, X-ray fluorescence analysis, the diffusion of optical spectroscopy, scanning electron microscopy, thermogravimetric and elemental analysis. It found that the obtained sorbents had porous crosslinked structure and did not dissolve in any organic solvents, solutions of inorganic acids and alkalines. The sorption properties of the syntesized polymer sorbents onto gold (III) ion in aqueous solutions have been studied. It is found that the adsorption effect of gold makes 85% - 90% and the equilibrium sorption capacity of polymer sorbent is 137 mg/g in acidic media. In order to improve sorption efficiency of sorbents to gold ions, the non-covalent immobilization of organic sulfur containing compound to the polymer matrix was carried out. The gold embedded polymer matrix was characterized by SEM, EDX, XRD and visible absorption spectroscopy. The obtained results indicated that the polymeric sorbent contained metallic form of zero-valent gold. It was found that the average particle size of elemental gold crystals was 28.31 nm.
Highlights
Nanogold composite materials have large applications such as nanoelectronic devices, catalyst, sensors, optical, anti corrosion materials and etc. [1]-[6]
The adsorption efficiency was studied for varying the initial concentration, acidity, amount of sorbent, distribution coefficient at 22 ̊C for an initial period of 60 min
Increasing the concentration of the gold ions in the solution the adsorption efficiency increases which is describe as L type sorption isotherm (Figure 1(b))
Summary
Nanogold composite materials have large applications such as nanoelectronic devices, catalyst, sensors, optical, anti corrosion materials and etc. [1]-[6]. Determination of gold ions in environmental and geological samples requires very often preconcentration and separation by polymer sorbents due to the high concentration of inter-. For nanogold produce is used chemical, physical, biochemical methods [12]-[14], gold nanoparticles have been prepared chemically through the reduction of hydrogen tetrachloroaurate using suitable reducing agents in the presence of stabilizers. Several works have been published regarding the successful application of polymers with metal binding sites as stabilizers in the preparation of gold nanoparticles with a controlled size and narrow size distribution [15] [16]. In the result of sorptional proses, the gold nanoparticles formed in the sorbent phase. The synthesized polymer sorbent has a porous matrix which can used to form nanogold particles by sorption-reducing method
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