Effect of two types of adsorption sites of activated carbon fibers on nitrate ion adsorption
Effect of two types of adsorption sites of activated carbon fibers on nitrate ion adsorption
复制标题
活性炭纤维两类吸附位点对硝酸根离子吸附的影响
DOI：
10.1016/j.jenvman.2021.112484
复制
发表时间：
2021
影响因子：
8.7
通讯作者：
Machida Motoi
中科院分区：
文献类型：
--
作者：
Tsuchiya Yukiyoshi;Yamaya Yusuke;Amano Yoshimasa;Machida Motoi
In this study, the activation with ZnCl2and heat treatment at 950 °C were performed to polyacrylonitrile-based carbon fiber and phenol resin to prepare two types of activated carbon fibers (ACFs) with different amounts of quaternary nitrogen (N-Q). In order to investigate the effect of chemical properties of ACFs on nitrate adsorption, various experiments and assess were conducted on these samples. The pHpzcof Py-7.0Z4-9.5HT10 and PhR-6.0Z4-9.5HT30 was about 7.1 and 7.0, respectively, and was no significant difference in the results. The C-π sites had a large effect on the amount of nitrate adsorption, and its adsorption capacity was greatest when the solution pH was about 3. However, the adsorption affinity (Ke) of C-π sites was weaker than that of N-Q, and the contribution for adsorption was small when the solution was low concentration or neutral, while the N-Q was the dominant adsorption site of ACFs. It is expected that the N-Q affected the adsorption kinetics, and the higher the amount of N-Q, the faster the adsorption rate. Py-7.0Z4-9.5HT10 had a large amount of C-π sites and N-Q. Therefore, the equilibrium adsorption amount (Qe) of Py-7.0Z4-9.5HT10 was 1.02 mmol/g at solution pH 3, and the adsorption kinetics were also fast.
