Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan, Hubei 430081, P.R. China.
Hubei Provincial Industrial Safety Engineering Technology Research Center, Wuhan University of Science and Technology, Wuhan, Hubei 430081, P.R. China.
Langmuir. 2023 May 2;39(17):6169-6177. doi: 10.1021/acs.langmuir.3c00296. Epub 2023 Apr 20.
In this paper, a new porous carbon material adsorbent was prepared using carbon microspheres assembled in hollow carbon spheres (HCS) with a hydrothermal method. Transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy were used to characterize the adsorbents. It was found that the diameter of carbon microspheres derived from 0.1 mol/L glucose was about 130 nm, which could be inserted inside HCS (pore size was 370-450 nm). The increase in glucose concentration would promote the diameter of carbon microspheres (CSs), and coarse CSs could not be loaded in the mesopores or macropores of HCS. Thus, the C@HCS adsorbent had the highest Brunauer-Emmett-Teller surface area (1945 m/g) and total pore volume (1.627 cm/g). At the same time, C@HCS posed a suitable ratio of micropores and mesopores, which could provide adsorption sites and volatile organic compound diffusion channels. Moreover, oxygen-containing functional groups -OH and C═O in CSs were also introduced into HCS, and the adsorption capacity and regenerability performance of the adsorbents were improved. The dynamic adsorption capacity of C@HCS for toluene reached 813 mg/g, and the Bangham model was more suitable for describing the toluene adsorption process. The adsorption capacity was stably kept above 770 mg/g after eight adsorption-desorption cycles.
本文采用水热法制备了一种新型多孔碳材料吸附剂，由空心碳球（HCS）中组装的碳微球（CS）组成。采用透射电子显微镜、扫描电子显微镜、X 射线光电子能谱、傅里叶变换红外光谱、X 射线衍射和拉曼光谱对吸附剂进行了表征。结果发现，直径约 130nm 的 0.1mol/L 葡萄糖衍生的碳微球可插入 HCS 中（孔径为 370-450nm）。增加葡萄糖浓度会促进碳微球（CS）的直径增大，而较粗的 CS 无法装入 HCS 的中孔或大孔中。因此，C@HCS 吸附剂具有最高的 Brunauer-Emmett-Teller 比表面积（1945m2/g）和总孔体积（1.627cm3/g）。同时，C@HCS 具有合适的微孔和介孔比例，可为吸附提供位点和挥发性有机化合物的扩散通道。此外，CS 中的含氧官能团-OH 和 C═O 也被引入到 HCS 中，从而提高了吸附剂的吸附容量和再生性能。C@HCS 对甲苯的动态吸附容量达到 813mg/g，苯模型更适合描述甲苯的吸附过程。经过八次吸附-解吸循环后，吸附容量稳定保持在 770mg/g 以上。
