Zhi Yue, Liu Jinxia
Department of Civil Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Quebec, H3A 0C3, Canada.
Department of Civil Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Quebec, H3A 0C3, Canada.
Chemosphere. 2016 Feb;144:1224-32. doi: 10.1016/j.chemosphere.2015.09.097. Epub 2015 Oct 23.
The objective of the research was to examine the effect of increasing carbon surface basicity on uptake of perfluorooctane sulfonic (PFOS) and carboxylic acids (PFOA) by activated carbon. Granular activated carbons made from coal, coconut shell, wood, and phenolic-polymer-based activated carbon fibers were modified through high-temperature and ammonia gas treatments to facilitate systematical evaluation of the impact of basicity of different origins. Comparison of adsorption isotherms and adsorption distribution coefficients showed that the ammonia gas treatment was more effective than the high-temperature treatment in enhancing surface basicity. The resultant higher point of zero charges and total basicity (measured by total HCl uptake) correlated with improved adsorption affinity for PFOS and PFOA. The effectiveness of surface modification to enhance adsorption varied with carbon raw material. Wood-based carbons and activated carbon fibers showed enhancement by one to three orders of magnitudes while other materials could experience reduction in adsorption towards either PFOS or PFOA.
该研究的目的是考察增加碳表面碱性对活性炭吸附全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA）的影响。由煤、椰壳、木材制成的颗粒活性炭以及酚醛聚合物基活性炭纤维通过高温和氨气处理进行改性，以便系统评估不同来源碱性的影响。吸附等温线和吸附分配系数的比较表明，氨气处理在增强表面碱性方面比高温处理更有效。由此产生的更高零电荷点和总碱度（通过总HCl吸附量测量）与对PFOS和PFOA的吸附亲和力提高相关。增强吸附的表面改性效果因碳原料而异。木质基碳和活性炭纤维的吸附增强了一到三个数量级，而其他材料对PFOS或PFOA的吸附可能会降低。
