Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5748063 | Ecotoxicology and Environmental Safety | 2017 | 7 Pages |
Abstract
The co-presence of perfluorooctane sulfonate (PFOS) and phosphate in wastewater of various industries has been detected. Removing PFOS and phosphate simultaneously before discharging sewage into natural water can decrease effectively the environmental risk caused by the combined pollution of PFOS and phosphate. In this study, laboratory batch experiments were conducted for investigating the co-adsorption of PFOS and phosphate on boehmite and the influences of temperature, phosphate initial concentration and pH on the co-adsorption. The adsorption thermodynamics and kinetics of PFOS and phosphate on boehmite were also investigated completely and systematically. The results showed that lower temperature favored the co-adsorptions of PFOS and phosphate. The adsorption of PFOS and phosphate on boehmite agreed well with the Langmuir isotherm and the adsorption parameters of thermodynamics are ÎH=â16.9 and â20.0 kJ molâ1 (PFOS and phosphate), ÎS=â5.69 and â7.63 J molâ1 Kâ1 (PFOS and phosphate) and ÎG <0 (PFOS and phosphate). It demonstrated that the co-adsorption of PFOS and phosphate on boehmite is a spontaneously exothermic process. Moreover, the co-adsorption process can be described well by a pseudo-second-order kinetic model. With increasing phosphate initial concentration, more phosphate could be adsorbed on boehmite, while the adsorption of PFOS decreased at phosphate initial concentration of less than 30 mg Lâ1 and increased at that of larger than 30 mg Lâ1. In the co-adsorption process, the adsorption amount of PFOS decreased with pH increasing, but that of phosphate changed little.
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Authors
Jin Qian, Mengmeng Shen, Peifang Wang, Chao Wang, Jing Hu, Jun Hou, Yanhui Ao, Hao Zheng, Kun Li, Jingjing Liu,