活性炭的改性及电吸附除磷研究

Study on Modification of Activated Carbon and Removal of Phosphorus by Electric-adsorption

以果壳活性炭为原料,采用NaOH活化法在不同配比下制备改性活性炭,分析改性前后活性炭的表面性质及电化学性能变化,并将活性炭制备成电极材料对含磷废水进行电吸附实验,探究活性炭吸附除磷性能。结果表明:改性后的活性炭孔隙变得发达,比表面积及中孔含量增加,微孔孔径变宽,比电容较大,具有良好的双电层电容特性,其中AC1由于丰富的孔结构,比电容最大,达到了110.51 F·g^(-1)。电吸附除磷实验中,改性活性炭较未改性活性炭具有更大的磷吸附量,AC1最高饱和吸附量达到了4.55 mg·g^(-1),比未改性活性炭提升了41.74%;电吸附除磷实验结果更加符合准一级动力学过程。

Using nut shell activated carbon as raw material,modified activated carbons were prepared byNaOH activation method at different ratios.The surface properties and electrochemical properties of activated carbons before and after modification were analyzed.The activated carbons were prepared into electrode material to conduct electric adsorption experiments on phosphorus containing wastewater to explore the adsorption and phosphorus removal performance of activated carbon.The results show that the modified activated carbons have developed pores,increased specific surface area and mesopore content,wider micropore diameter,larger specific capacitance,and has good double-layer capacitance characteristics.The specific capacitance of AC1 reached 110.51 F·g^(-1) due to its rich pore structure.In the experiment of phosphorus removal by electric adsorption,the modified activated carbons have larger phosphorus adsorption capacity than the unmodified activated carbon,and the maximum saturated adsorption capacity of AC1 reached 4.55 mg·g^(-1),41.74%higher than that of the unmodified activated carbon.The experimental results of phosphorus removal by electric adsorption are more consistent with the quasi-first-order kinetic process.