颗粒活性炭对模拟活性染料废水的吸附脱色效果

本文借助SEM观察了颗粒活性炭的表面形态结构，利用紫外-可见分光光度计测试分析了模拟染料废水吸附前后的吸光度变化，以考察颗粒活性炭种类、目数、染料废水浓度、pH值、吸附温度及时间对染液吸附脱色效果的影响。实验结果表明：椰壳活性炭的吸附脱色效果较煤质、果壳活性炭好；活性炭目数越大，其吸附脱色效果越好；活性炭对染料废水的吸附脱色效果随染料浓度的增大而呈线性函数下降；酸性环境下活性炭的吸附脱色效果好于碱性环境，pH值为5.5时，吸附脱色效果最好；吸附温度越高，脱色率越高，但升至一定温度后对吸附脱色效果增加不再显著；达平衡吸附前，增加吸附时间对活性炭的吸附脱色效果增加较为显著。

Analysis of adsorption decoloring effect of granular activated carbon for simulative reactive dye wastewater

In this paper, the surface morphology structure of activated carbon was characterized by using SEM, and the change of absorbance of reactive dye wastewater before and after adsorption was measured by the ultraviolet-visible spectrophotometer. The effects of granular activated carbon types, mesh size, dye wastewater concentration, pH value, absorption temperature and time on the adsorption decoloring effect for dye wastewater were investigated. The research results showed that coconut shell activated carbon has a better adsorption decoloring effect, compared with coal-based activated carbon and nutshell activated carbon. The larger mesh size, the better adsorption decoloring effect we can achieve. The adsorption decoloring effect of activated carbon for dye wastewater decreases linearly with the increase of dye concentration. The adsorption decoloring effect of activated carbon in the acidic condition is better than that in the alkaline environment, and the best adsorption decoloring result is obtained when pH value is 5.5. The higher the temperature, the more color can be removed. However, when the dye wastewater is heated to a certain temperature, the improvement of the adsorption decoloring effect is not significant. Before the adsorption equilibrium, the increase of absorption time has a pronounced effect on the color removal.