油茶籽壳炭微球及其改性物对水中全氟辛烷磺酸盐(PFOS)的吸附  

Adsorption of perfluorooctanesulfonate(PFOS) by carbon microspheres and their modified products prepared from Camellia oleifera seed shell

作　　者：刘宇[1] 郭会琴[1] 颜流水[1] 李可心[1] 曾春城 马文天[1] 毕晨阳[1] 

机构地区：[1]南昌航空大学环境与化学工程学院,南昌330063

出　　处：《环境化学》2016年第10期2172-2182,共11页Environmental Chemistry

基　　金：国家自然科学基金(21165013;21366024;21665018);江西省青年科学基金(20114BAB213016)资助~~

摘　　要：基于废弃油茶籽壳制备了4种炭材料,并应用于对水中全氟辛烷磺酸盐(PFOS)的吸附性能研究.以油茶籽壳生物质为碳源,首先通过水热碳化法制备了胶质炭微球并进一步对炭微球分别进行了退火、KOH浸渍扩孔和KOH研磨扩孔改性,然后将所制备的4种炭材料应用于水中PFOS的吸附去除,并对其吸附机理进行了探讨.吸附动力学结果表明,4种炭材料对PFOS吸附均符合拟二级动力学模型(R2≥0.994),吸附平衡时间分别为2 h、1 h、6 h和2 h.溶液p H值对KOH研磨炭材料的吸附性能影响较小,而对其它3种材料影响较大,4种炭材料对PFOS吸附的最佳p H值分别为2—3、3、2、2—10.4种炭材料对PFOS的吸附均符合Langmuir吸附模型(R2≥0.988),最大吸附量分别为14.4、17.8、223.7、3658.9 mg·g-1.4种炭材料对PFOS的吸附均倾向于单分子层的化学吸附过程,材料的比表面积为影响吸附量的最主要因素,其对PFOS的吸附主要依赖静电作用和疏水作用.Four types of biochar materials were prepared from the Camellia oleifera seed shell and applied in the adsorption removal of perfluotooctancesulfonate（ PFOS） in aqueous solution. Firstly,the colloidal carbon microspheres were prepared from Camellia oleifera powder by hydrothermal carbonization. The synthesized carbon microspheres were then modified by annealing treatment,impregnating treatment with KOH solution and grinding activation treatment with KOH solid,respectively; and four different carbon materials were obtained. The adsorption properties of PFOS onto the four carbon materials were investigated and the corresponding adsorption mechanisms were studied. The adsorption kinetic results indicated that the PFOS adsorption onto these four adsorbentswere all fitted with the pseudo-second-order model well（ R^2≥0. 994）,and the adsorption reached equilibrium with in 2 h,1 h,6 h and 2 h,respectively. Initial p H of the solution has little effect on PFOS adsorption onto the biochar obtained by KOH grinding treatment,but great effect on that of the other three biochar materials,and the optimum p H value for the four materials was 2—3,3,2 and2—10,respectively. The Langmuir adsorption model described the experimental data of adsorption isotherms better than that Freundlich model（ R^2≥0. 988）,with the maximum adsorption capacity of14. 4,17. 8,223. 7 and 3658. 9 mg·g^- 1,respectively. The mechanistic studies suggested that the specific surface area was the primary factor affecting the adsorption process,and the adsorption process was mainly depended on the electrostatic force and hydrophobic effect between the adsorbent and PFOS.

关 键 词：油茶籽壳 炭微球 全氟辛烷磺酸盐(PFOS) 吸附 

分 类 号：X703[环境科学与工程—环境工程]