Nitrate and Copper Ions Adsorption Properties of Carbon Fibers with Amino Groups Prepared by Benkeser Reaction

Yukiyoshi Tsuchiya; Yoshimasa Amano; Motoi Machida

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Nitrate and Copper Ions Adsorption Properties of Carbon Fibers with Amino Groups Prepared by Benkeser Reaction

机译：Nitrate and Copper Ions Adsorption Properties of Carbon Fibers with Amino Groups Prepared by Benkeser Reaction

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The Benkeser reaction is a relatively simple method to proceed with partial reduction using ethylenediamine, lithium, and tert-butanol. Pyridine (N-6) and pyrrole (N-5) on the carbon skeleton are slightly negatively charged and not suitable for adsorption of nitrate ion (NO_3~-). On the other hand, the amino group is positively charged by protonation and is considered to be excellent for adsorption of NO_3~-. In this study, we attempted to prepare carbon fibers (CFs) with amino groups by performing the Benkeser reaction on the air-stabilized polyacrylonitrile (PAN)-based carbon fiber (PYROMEX). Various experiments and assesses were carried out on the optimized samples to investigate the adsorption performance of prepared CFs. Adsorption experiments of copper ion (Cu~(2+)) were also conducted to confirm the presence of amino groups. The Benkeser reaction reduced the amounts of N-6 and N-5 on the carbon skeleton from 0.22 to 0.15 and from 10.36 to 7.35 wt, respectively. On the other hand, the amino group value increased from 2.33 to 3.67 wt and the protonated amino group value rose from 3.50 to 7.92 wt. The surface areas (S_(BET)) of PYROMEX and Py-Ben-Bu 60 were 9 and 8 m~2/g, respectively, and there was not any development of pore structure at all. The maximum adsorption amount (X_m) of Py-Ben-Bu 60 for the Langmuir isotherm model was 0.85 mmol/g at the equilibrium solution pH (pH_e) 3. These results indicated that the Benkeser reaction did not affect the pore properties such as S_(BET), but was an effective method for reducing nitrogen functional groups on the carbon skeleton to amino groups and preparing CFs with high NO_3~- adsorption capacity. The Cu~(2+) adsorption amount of Py-Ben-Bu 60 was 0.31 mmol/g at solution pH_e 5.19. Py-Ben-Bu 60 was a favorable adsorbent for NO_3~- under acidic conditions and for Cu~(2+) under close to neutral conditions such as solution pH_e 5.

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《繊維学会誌》 |2022年第913期|204-204|共1页
作者
Yukiyoshi Tsuchiya; Yoshimasa Amano; Motoi Machida;
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Graduate School of Science and Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;

Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan, Safety and Health Organization, Chiba University,1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;

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Nitrate and Copper Ions Adsorption Properties of Carbon Fibers with Amino Groups Prepared by Benkeser Reaction

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