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研究了胶原纤维固化杨梅单宁(IBT)这一新型吸附材料对Mo6+的吸附特性。实验表明,温度对吸附容量影响不大,而pH值对吸附容量有显著影响,Mo6+的吸附容量随pH值降低而增加,表明其吸附机理是吸附剂与聚钼阴离子之间的静电结合。当Mo6+的初始质量浓度为100.0mg/L、吸附剂用量0.100g、温度为303K、pH值2.0时,IBT对Mo6的吸附量为82.4mg/g。Freundlich方程可以很好地描述IBT对Mo6+的吸附等温线。动力学研究表明,初始吸附速率很快,吸附达到平衡的时间约为600min,其吸附动力学可很好地用拟二级速率方程描述,计算所得的平衡吸附量与实测值误差很小。解吸实验表明,0.02mol/LEDTA溶液能使吸附剂再生,并能循环使用。选择性吸附研究表明,在酸性(pH值2.0)条件下,IBT对Mo6+的吸附率大于95%,而对Ni2+和Cu2+的吸附率低于5%,可用于Mo6+-Ni2+和Mo6+-Cu2+二元混合溶液中Mo6+的分离和提取。
The adsorption characteristics of Mo6 + by a new type of adsorbent material of collagen fiber-cured melphalan (IBT) were studied. Experiments show that the temperature has little effect on the adsorption capacity, while the pH value has a significant effect on the adsorption capacity. The adsorption capacity of Mo6 + increases with the decrease of pH, indicating that the adsorption mechanism is the electrostatic bond between the adsorbent and the polyanion. When the initial concentration of Mo6 + is 100.0mg / L, the amount of adsorbent is 0.100g, the temperature is 303K, and the pH value is 2.0, the adsorption capacity of IBT to Mo6 is 82.4mg / g. The Freundlich equation can well describe the adsorption isotherm of IBT to Mo6 +. Kinetic studies show that the initial adsorption rate is very fast, the adsorption equilibrium time is about 600min, and the adsorption kinetics can be well described by the quasi-second-order rate equation. The calculated equilibrium adsorption capacity has little error with the measured value. Desorption experiments show that, 0.02mol / LEDTA solution can regenerate the adsorbent, and can be recycled. Selective adsorption studies showed that the adsorption rate of IBT to Mo6 + is more than 95% and the adsorption rate of Ni2 + and Cu2 + is less than 5% under acidic condition (pH 2.0), which can be used for Mo6 + -Ni2 + and Mo6 + -Cu2 + Separation and Extraction of Mo6 + in Mixed Solution.