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| Synthesis of Nano B2O3/TiO2 Composite and Its Application in Separation and Preconcentration of Trace Silver |
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| DOI：10.3969/j.issn.1004-4957.年份.月份 |
| KeyWord:nano B2O3/TiO2 composite separation and preconcentration flame atomic absorption spectrometry（FAAS） silver |
| Author | Institution |
| 屈东方，周方钦，刘琳，李文山 |
湘潭大学化学学院环境友好化学与应用省部共建教育部重点实验室 |
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| Abstract: |
| Nano B2O3/TiO2 composite as a new sorbent was synthesized， and the characteristic of the synthesized material was studied by scanning electron microscope（SEM） and infrared spectrometry （IR）. By investigating the optimal conditions of adsorption and desorption of nano B2O3/TiO2 composite for Ag+， a new method for the determination of trace silver was proposed. After oscillated for 20 minutes at 22 ℃ and pH 4.3， silver could be quantitatively adsorbed by nano B2O3/TiO2 composite， and the adsorption capacity was obtained to be 11.72 mg/g. The adsorbed silver could be eluted from the surface of the absorbent with 0.1 mol/L HNO3-0.05 mol/L thiourea（1∶4）. Under the optimum experimental conditions， the calibration curve was linear over Ag+ concentration in the range of 0.01-4.00 mg/L， with a detection limit（3σ） of 2.01 μg/L.The RSD（n=11） for determination of 0.4 mg/L Ag+ was 1.8%. The spiked recoveries ranged from 95% to 105%. The method was applied in the determination of trace silver in slag samples with satisfactory results. |
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