An azine-based polymer derived hierarchically porous N-doped carbon for hydrophilic dyes removal

Songlin Zhao; Fushan Chen; Xiandi Zhu; Weijun Liu; Chenlin Wu; Jie Zhang; Shibin Ren; Zhengzhong Yan; Wenli Cao; Qunfeng Zhang; Xiaonian Li

doi:10.1016/j.jhazmat.2021.125299

An azine-based polymer derived hierarchically porous N-doped carbon for hydrophilic dyes removal

J Hazard Mater. 2021 Jul 5:413:125299. doi: 10.1016/j.jhazmat.2021.125299. Epub 2021 Feb 10.

Authors

Songlin Zhao¹, Fushan Chen², Xiandi Zhu³, Weijun Liu³, Chenlin Wu³, Jie Zhang³, Shibin Ren³, Zhengzhong Yan³, Wenli Cao³, Qunfeng Zhang⁴, Xiaonian Li⁵

Affiliations

¹ College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China; Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China.
² Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang University, Jiujiang 332005, Jiangxi, China.
³ Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China.
⁴ College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China. Electronic address: zhangqf@zjut.edu.cn.
⁵ College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.

PMID: 33930941
DOI: 10.1016/j.jhazmat.2021.125299

Abstract

In this study, a novel hierarchically porous N-doped carbon (HPNC) material was successfully prepared by soft-templating method. The commercial triblock copolymer of Pluronic F127 and a polyazine derived from hydrazine hydrate & glyoxal were used as soft template and precursor, respectively. The obtained materials were fully characterized and tested as a sorbent for the removal of hydrophilic dyes of Methylene blue (MB), Basic Fuchsin (BF), Eosin Y (EY) and Rhodamine B (RB) from their aqueous effluents. According to the characterization results, the synthesized material of HPNC-1000 presented thick fibrous morphology with micron size in diameter, hierarchically porous structure with surface area of 1853 m²/g, pore volume of 1.59 cm³/g and nitrogen content of 4.5 wt%. Adsorption-desorption investigation reveals that synergistic effect of hydrophobic interaction and hydrogen-bonding formation of the dye molecules with the sorbent was most pronounced in the adsorptions. The maximum adsorption capacities for MB, BF, EY and RB reached 0.83, 0.92, 1.23 and 1.83 mmol g^-1, respectively. The adsorption processes well fitted by the pseudo first-order kinetic model and the Liu's isotherm. The sorbent can be regenerated by above 90% of the initial adsorption efficiency after six regeneration cycles.

Keywords: Adsorption; Hierarchically porous structure; Hydrophilic dye; Nitrogen-doped carbon; Polyazine.