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以细菌纤维素(BC)为原料,通过化学改性法制备新型、高效且价廉的吸附材料——表面氨基化细菌纤维素,并对其进行表征及分析;同时以Cu~(2+)、Pb~(2+)和Cd~(2+)为研究对象,对其吸附热力学和动力学特性进行研究,并探讨吸附机理,建立数学模型。结果表明:氨基化细菌纤维素对Cu~(2+)、Pb~(2+)和Cd~(2+)的吸附过程更好地符合Langmuir等温方程和准二级反应动力学模型,说明吸附过程为单分子层吸附,以化学吸附作用为主。Elovich方程、粒子内扩散模型也能很好地反映吸附模式,说明是其吸附液膜扩散和粒子内扩散共同作用的结果。吸附过程是吸热反应,适当升高反应温度将有利于吸附发生。
Using bacterial cellulose (BC) as raw material, a novel, efficient and cheap adsorbent material, surface-aminated bacterial cellulose, was prepared by chemical modification and characterized and analyzed. At the same time, , Pb 2+ and Cd 2+, the adsorption thermodynamics and kinetics were studied, and the adsorption mechanism was discussed to establish the mathematical model. The results showed that the adsorption process of Cu2 +, Pb2 +, and Cd2 + by amebic fiber conforms better to the Langmuir isothermal equation and quasi-second-order reaction kinetics model, indicating that adsorption The process for the monolayer adsorption, chemical adsorption dominated. Elovich equation and intra-particle diffusion model can also well reflect the adsorption mode, indicating that the adsorption liquid film diffusion and intra-particle diffusion together effect results. Adsorption process is endothermic reaction, the appropriate increase in the reaction temperature will be conducive to adsorption occurs.