胶原纤维对Cr3 的吸附性能研究

Study on the Adsorption Performance of Cr3 on the Collagen Fiber

摘要:

以铬粉溶液为处理对象，研究了胶原纤维对Cr3+的吸附性能；通过单因素实验分别考察了pH、温度、时间、铬液初始浓度、吸附剂用量以及盐离子浓度（Na+、Ca2+）对吸附过程的影响，结果表明：胶原纤维对Cr3+具有较强的吸附能力，吸附的最佳pH为4.5，最适温度40℃，在最佳吸附条件下，胶原纤维对Cr3+的吸附容量高达90mg/g，对于一定量的铬粉溶液，吸附容量随着Cr3+初始浓度的增大而增加，随着吸附剂用量的增加而减小，随着时间的延长先增加后趋于平缓。溶液中Na+、Ca2+离子的存在会抑制吸附过程的进行，并且随着离子浓度的增加，抑制作用增强；对Cr3+在胶原纤维上的吸附热力学和吸附动力学进行了研究，结果表明：Freundlich等温方程和二级速率方程能够更好的描述Cr3+在胶原纤维上的吸附行为。

Abstract:

The characteristics of adsorption of Cr3+ on the collagen fiber(CF) were studied with chromium solution as target; The effects of temperature, time, pH, adsorbent dosage, initial concentration and salt ion concentration (Na+, Ca2+) on the adsorption process were reseached through the single factor experiments, respectively. The results indicated that the collagen fibers have strong adsorption abilities to Cr3+ and the adsorption capacity can be up to 90mg/g, the optimal pH and temperature of adsorption were 4.5 and 40℃, respectively; For a certain amount of chromium solution, the adsorption capacity was increased with the increasing of initial concentration of Cr3+, but decreased along with the increasing of adsorbent dosage. With the extension of time, the adsorption capacity increased gradually and finally reached adsorption equilibrium. The salt ions in the solution will have inhibitory effect on the adsorption process, and the inhibition enhanced with the increasing of ion concentration. The adsorption thermodynamics and adsorption dynamics were studied, by comparison, it was found that the Freundlich equation and Pseudosecond-order kinetic model can better describe adsorption behavior of Cr3+ on the collagen fiber.