Abstract
A new adsorbent(A-PGMA) has been synthesized via functionalizing poly(glycidyl methacrylate) microsphere with 2-aminothiazole and used to adsorb gold ions from aqueous solutions. The adsorbent was characterized by X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), Zeta potential, scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR). The influence factors such as the pH value of the solution, the initial gold ion concentration and the contact time were examined. Simultaneously, the adsorption process of the gold ion on A-PGMA fitted well with the Langmuir and pseudo-second-order models, respectively. The results showed that the maximum adsorption capacity was 440.54 mg/g and the equilibrium time of adsorption was about 3 h under pH 4. Moreover, the adsorbent has a high reusability after five cycles and good selectivity from coexisting ions, including Zn(II), Mg(II), Cu(II), Ge(IV) and B(III). The adsorption mechanisms of gold ions were ion exchange and chelation between the sulfur and nitrogen groups on the surface of A-PGMA and AuCl4−. Therefore, the adsorbent has a great potential for adsorption of gold ions from aqueous solutions.
Highlights
Gold has been known for centuries as a precious metal for its wide applications and outstanding physical and chemical properties, such as excellent ductility and conductivity, high catalytic activity and so on [1,2,3,4]
In order to better understand the relationship between adsorption capacity and gold ions concentration, the Langmuir and Freundlich isotherm models were used to analyze the adsorption process of T-Poly(glycidyl methacrylate) (PGMA)
The results indicated that the A-PGMA chelating resin has a good selectivity for gold ions
Summary
Gold has been known for centuries as a precious metal for its wide applications and outstanding physical and chemical properties, such as excellent ductility and conductivity, high catalytic activity and so on [1,2,3,4]. Polymers 2018, 10, 159 reusable rate, high cost and weak selectivity restrain the actual applicability in gold adsorption. For this perspective, it is very important to develop a novel adsorbent with high capacity and selectivity. Polymer microspheres have been widely applied into the adsorption of metal ions [22]. PGMA with various functional groups has good adsorption properties of metal ions. The groups containing S and N donor atoms can strongly interact with precious metals based on the theory of hard soft acid-base (HSAB). A new adsorbent (A-PGMA) has been synthesized via functionalizing poly(glycidyl methacrylate) microsphere with 2-aminothiazole and used to adsorb gold ions from aqueous solutions. The selectivity, reusability, kinetics, isotherms and mechanism were studied
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