还原改性活性炭吸附染料废水及其吸附动力学

Adsorption and Kinetic Characteristics of Dye Wastewater on Reduction Modified Activated Carbons

采用高温氮气、氨水还原改性椰壳活性炭,以增强活性炭表面的非极性。通过BET(Brunauer Eunett,Teller)比表面积、孔径分布、元素分析、FT-IR,零电荷点(pHpzc)等对改性活性炭的孔结构和表面化学性质进行表征。采用静态吸附实验研究了改性活性炭对染料废水的吸附性能。结果表明活性炭通过高温氮气、氨水还原改性能够提高活性炭的表面极性;;并且能够增加活性炭孔数量提高比表面积。500℃氮气氛围和15%氨水还原改性,活性炭的非极性吸附得到显著提高,比原料炭的脱色率提高了22.7%、19.1%;COD的去除率达到96.9%,96.3%。动力学研究表明,改性活性炭对染料废水的吸附符合准二级动力学模型。

The activated carbons was modified by N2 at high temperature and ammonia and the pore structure parameters and surface chemical properities of modified activated carbon was analysised by surface area and porosity analyzer, elemental analyzer and FT-IR. The adsorption performance of modified activated carbons was evaluated by color removal at equilibrium adsorption capacity as the criterion for evaluation. The results show that the color removal of the activated carbons modified by 15% ammonia and 500 ~C N2 atmosphere are improved to 22.7%, 19. 1% in contrast to the original activated carbons, the chemical oxygen demand（COD） of them reaches 96. 8% and 96. 3%, and the nonpolar adsorption of them also be strengthenned. The study on kinetic parameters shows that the adsorption is best described by pseudo-second-order kinetic.