改性棕榈纤维活性炭对活性染料的吸附性能

为了探究棕榈纤维在处理印染废水中的应用，将MgO通过共沉淀-灼烧氧化法负载于棕榈纤维活性炭，利用FE-SEM、FTIR、真密度测定法表明棕榈纤维活性炭孔道及表面存在MgO。通过静态吸附实验，研究了棕榈纤维活性炭改性前后对于活性艳红X-3B染料的吸附性能，考察了不同染料初始浓度下MgO改性棕榈纤维活性炭（MgO/PAC）对染料的吸附动力学，以及在不同pH下对染料的吸附性能。实验结果表明：MgO改性可显著提高吸附性；经镁与碳以摩尔比2.5:1改性的棕榈活性炭对染料活性艳红X-3B的吸附量提高约8倍；MgO改性棕榈纤维活性炭对活性艳红X-3B的吸附符合伪二级动力学模型，颗粒内扩散不是吸附过程的唯一速率控制步骤，整个吸附过程是由多种动力学吸附机理共同作用的结果。

Adsorption kinetics of reactive dye onto modified palm fiber activated carbon

The palm fiber was carbonized and then modified by MgO in precipitation burning oxidation method for dealing with dyeing wastewater. The surface of MgO modified palm activated carbon (MgO/PAC) was observed by the scanning electron microscopy (SEM), the FT-IR spectra and the true density. Palm activated carbon and modified palm activated carbon’s adsorptive capacity were tested by the static absorption experiments. The adsorption kinetic study of dye in different initial concentration and the adsorption quantity in different pH were studied. The results showed that, the dye adsorption quantity was improved almost 8 times after the modification; the adsorption on Reactive Brilliant Red X-3B followed the pseudo second-order kinetic model and whose reaction rate was not only controlled by the intra-particle diffusion but also by extra-particle diffusion process.