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Selective adsorption of Ag+ by silica nanoparticles modified with 3-Amino-5-mercapto-1,2,4-triazole from aqueous solutions
閱讀：337 發(fā)布時間：2017-7-27State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming 650093, Yunnan, China
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
摘要：A novel adsorbent was synthesized via modifying silica nanoparticles with 3-Amino-5-mercapto-1,2,4-triazole and was used to selectively adsorb silver ions from aqueous solutions. The adsorbent was confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscope and Brunauer-Emmett-ler (BET) surface area analysis. Batch adsorption experiments were carried out to evaluate the adsorption conditions, reusability and selectivity. The results showed that the optimum pH is 5 and the maximum adsorbability was 124.52 mg/g. The adsorption rate was very high and equilibrium was achieved within 20 min. The total adsorption process preferably followed the pseudo-second order kinetics and the Langmuir isotherm model. The sorbent was stable and efficient. After used five times, the adsorbability was 98.72% of the initial adsorbability. Moreover, the adsorbent adsorb selectively Ag+ from coexisting ions in aqueous solution.