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将斛壳丹宁酸与甲醛聚合来形成的凝胶作为吸附剂能有效地移去水溶液中的银离子。研究了不同银离子初始浓度、溶液温度、pH值条件下斛壳丹宁酸树脂的附和解吸行为。研究了有关经验动力学模型的适应性。伪二级动力学模型表明银离子的吸附是很快的。用FTIR和SEM对吸附和解吸银离子后的斛壳彤宁酸和斛壳丹宁酸树脂进行表征。银离子在斛壳宁酸树脂上的吸附随着银离子初始浓度的增加而增加,随着溶液温度的升高而减少。在低pH值的H2SO4、HNO3和HCl溶液中进行解吸实验。斛壳丹宁酸树脂在pH2.0~7.0溶液中对银离子表现出高的吸附容量,在银离子初始浓度100.0mg/L、温度296K和pH5.0的条件下达到最大的吸附量97.08mg/g。在1mol/LHCl+1%硫脲溶液中银离子的脱吸率达99.6%。
The gel formed by polymerizing the tannic acid and formaldehyde of the hollyhock can effectively remove the silver ions in the aqueous solution as an adsorbent. The synergistic desorption behavior of tannin resin from the shell of Huhhot shell was studied at different initial concentrations of silver ions, solution temperature and pH value. The adaptability of empirical dynamics models was studied. The pseudo-second-order kinetic model shows that the adsorption of silver ions is fast. FTIR and SEM were used to characterize the crystal structure of Hcl and Tannin after adsorption and desorption of silver ion. The adsorption of silver ions on humulin resin increased with the initial concentration of silver ions and decreased with the increase of solution temperature. Desorption experiments were performed in low pH H2SO4, HNO3 and HCl solutions. The solution of holmium tannin resin showed high adsorption capacity for silver ions in pH 2.0 ~ 7.0 solution. The maximum adsorption capacity of silver nitrate was 97.08mg under the conditions of initial concentration of silver ions 100.0mg / L, temperature 296K and pH5.0 / g. In 1mol / LHCl + 1% thiourea solution silver ion desorption rate of 99.6%.