Co-adsorption of perfluorooctane sulfonate and phosphate on boehmite: Influence of temperature, phosphate initial concentration and pH
Co-adsorption of perfluorooctane sulfonate and phosphate on boehmite: Influence of temperature, phosphate initial concentration and pH
复制标题
全氟辛烷磺酸和磷酸盐在勃姆石上的共吸附：温度、磷酸盐初始浓度和 pH 值的影响
DOI：
10.1016/j.ecoenv.2016.11.026
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发表时间：
2017
影响因子：
6.8
通讯作者：
Liu Jingjing
中科院分区：
文献类型：
--
作者：
Qian Jin;Shen Mengmeng;Wang Peifang;Wang Chao;Hu Jing;Hou Jun;Ao Yanhui;Zheng Hao;Li Kun;Liu Jingjing
在不同的工业废水中检测到全氟辛烷磺酸（PFOS）和磷酸盐的共存。污水排入自然水体前同时去除全氟辛烷磺酸和磷酸盐，可有效降低全氟辛烷磺酸和磷酸盐复合污染带来的环境风险。本研究通过室内批量实验研究了氟辛烷磺酸和磷酸盐在薄水铝石上的共吸附，以及温度、磷酸盐初始浓度和pH对共吸附的影响。研究了磷和全氟辛烷磺酸在薄水铝石上的吸附热力学和动力学。结果表明，较低的温度有利于PFOS和磷酸盐的共吸附。薄水铝对PFOS和磷酸盐的吸附符合Langmuir等温线，吸附热力学参数为ΔH=−16.9和−20.0 kJ mol−1（PFOS和磷酸盐），ΔS=−5.69和−7.63 kJ mol−1K−1（PFOS和磷酸盐），ΔG <0 （PFOS和磷酸盐）。结果表明，全氟辛烷磺酸和磷酸盐在薄水铝石上的共吸附是一个自发放热过程。此外，共吸附过程可以用拟二级动力学模型很好地描述。随着磷酸盐初始浓度的增加，薄水铝石对磷酸的吸附量增加，当磷酸盐初始浓度小于30 mg L−1时，对PFOS的吸附量减少，大于30 mg L−1时，对PFOS的吸附量增加。在共吸附过程中，PFOS的吸附量随pH的升高而降低，而磷酸盐的吸附量变化不大。
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 ΔH=−16.9 and −20.0 kJ mol−1(PFOS and phosphate), ΔS=−5.69 and −7.63 J mol−1K−1(PFOS and phosphate) and ΔG <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 L−1and increased at that of larger than 30 mg L−1. In the co-adsorption process, the adsorption amount of PFOS decreased with pH increasing, but that of phosphate changed little.