废印刷线路板基炭材料的制备及其性能研究

Preparation and Properties of Carbon Materials Derived from Waste Printed Circuit Boards

以废印刷线路板非金属粉末为碳源,KOH为活化剂,采用预处理-炭化-活化三步法制备了多孔炭材料(PBT-S),并研究了其对Cr(Ⅵ)的吸附性能。孔径分布和N_2吸附脱附等温线结果表明PBT-S具有微孔、介孔混合型的多级孔特征,比表面积为2796. 95 m^2/g,总孔容为1. 56 cc/g。在此基础上研究了其对Cr(Ⅵ)的吸附性能,实验结果表明,在pH为2、初始浓度为100 mg/L,投加量为20 mg条件下Cr(Ⅵ)吸附量可达234 mg/g,吸附动力学符合准二级动力学模型,等温吸附拟合更接近于Langmuir吸附等温线模型。

The porous carbon was prepared via the pretreatment-carbonization-activation three-step method, using waste printed circuit board （WPCB ） nonmetallic powder as carbon source and KOH as activator. The pore size distribution and nitrogen adsorption-desorption isotherm showed that PBT-S had micro-mesoporous multilevel pore characteristics with the highest specific surface area of 2796.95 m^2 /g and total pore volume of 1.56 cc/g. Furthermore, the adsorption mechanism of Cr （ Ⅵ ） was studied. The experimental results displayed that the adsorption capacity of Cr （ Ⅵ ） was 234 mg/g at pH=2, initial concentration was 100 mg/L and dosage was 20 mg. The adsorption kinetics accorded with the pseudo-second-order kinetics model, and the isotherm adsorption fit closer to the Langmuir adsorption isotherm model.