Department of Chemical and Environmental Engineering , Yale University , New Haven , Connecticut 06520-8286 , United States.
Nanotechnology-Enabled Water Treatment (NEWT) , Yale University , 17 Hillhouse Ave , New Haven , Connecticut 06511 , United States.
Environ Sci Technol. 2019 Sep 3;53(17):10352-10360. doi: 10.1021/acs.est.9b03067. Epub 2019 Aug 20.
This study presents a 3D hierarchically ordered porous carbon material (HOPC) that simultaneously achieves efficient adsorption of a range of water pollutants as well as catalytic oxidation of adsorbed pollutants. High adsorption capacity and rapid adsorption kinetics are attributed to the hydrophobic nature of the carbon substrate, the large surface area due to high porosity, and the relatively uniform size of pores that comprise the structure. The oxidative degradation is achieved by efficient mediation of electron transfer from pollutants to persulfate through the sp-hybridized carbon and nitrogen network. As the persulfate activation and pollutant oxidation do not involve reactive radicals, oxidative degradation of the adsorbent is prevented, which has been a primary concern when adsorption and oxidation are combined either to regenerate adsorbate or to enhance oxidation performance. Batch tests showed that near complete removal of various recalcitrant micropollutants can be achieved within a short time (less than 1 min) even when treating a complex water matrix, as pollutants are concentrated on the surface of HOPC, where their oxidation is catalyzed.
本研究提出了一种 3D 分级有序多孔碳材料（HOPC），它能够同时有效地吸附多种水污染物，并催化氧化吸附的污染物。高吸附容量和快速吸附动力学归因于碳基质的疏水性、高孔隙率导致的大表面积以及构成结构的相对均匀的孔尺寸。通过 sp 杂化碳和氮网络将污染物的电子有效地转移到过硫酸盐中，从而实现氧化降解。由于过硫酸盐的活化和污染物的氧化不涉及反应性自由基，因此可以防止吸附剂的氧化降解，这是将吸附和氧化结合起来以再生吸附物或增强氧化性能时的主要关注点。批量测试表明，即使在处理复杂水基质的情况下，各种难处理的微量污染物也能在短时间内（不到 1 分钟）几乎完全去除，因为污染物被浓缩在 HOPC 的表面，在那里它们被催化氧化。
