Faculty of Engineering, University of Technology Sydney (UTS), P.O. Box 123, Broadway, NSW, 2007, Australia.
Faculty of Engineering, University of Technology Sydney (UTS), P.O. Box 123, Broadway, NSW, 2007, Australia.
Chemosphere. 2019 May;223:616-627. doi: 10.1016/j.chemosphere.2019.02.033. Epub 2019 Feb 12.
Polycyclic aromatic hydrocarbons (PAHs) and heavy metals are dangerous pollutants that commonly co-occur in water. An adsorption study conducted on the simultaneous removal of PAHs (acenaphthylene, phenanthrene) and heavy metals (Cd, Cu, Zn) by granular activated carbon (GAC) showed that, when these pollutants are present together, their adsorption was less than when they were present individually. The adsorptive removal percentage of PAHs (initial concentration 1 mg/L) was much higher than that of heavy metals (initial concentration (20 mg/L). The reduction in adsorption of PAHs by heavy metals followed the heavy metals' adsorption capacity and reduction in the negative zeta potential of GAC order (Cu > Zn > Cd). In contrast, PAHs had little effect on the zeta potential of GAC. The Langmuir adsorption capacities of acenaphthylene (0.31-2.63 mg/g) and phenanthrene (0.74-7.36 mg/g) on GAC decreased with increased metals' concentration with the reduction following the order of the metals' adsorption capacity. The kinetic adsorption data fitted to Weber and Morris plots, indicating intra-particle diffusion of both PAHs and heavy metals into the mesopores and micropores in GAC with the diffusion rates. This depended on the type of PAH and metal and whether the pollutants were present alone or together.
多环芳烃（PAHs）和重金属是危险的污染物，通常同时存在于水中。一项关于颗粒状活性炭（GAC）同时去除多环芳烃（苊、菲）和重金属（Cd、Cu、Zn）的吸附研究表明，当这些污染物同时存在时，它们的吸附量低于单独存在时。多环芳烃（初始浓度 1mg/L）的吸附去除率远高于重金属（初始浓度（20mg/L）。重金属对多环芳烃吸附的抑制作用遵循重金属吸附能力和 GAC 负 ζ 电位降低的顺序（Cu＞Zn＞Cd）。相比之下，多环芳烃对 GAC 的 ζ 电位影响不大。GAC 对苊（0.31-2.63mg/g）和菲（0.74-7.36mg/g）的朗缪尔吸附容量随着金属浓度的增加而降低，降低的顺序与金属的吸附容量一致。动力学吸附数据符合 Weber 和 Morris 图，表明多环芳烃和重金属都通过内扩散进入 GAC 的中孔和微孔，扩散速率取决于 PAH 和金属的类型以及污染物是单独存在还是同时存在。
