Nitrogen-enriched carbon sheet for Methyl blue dye adsorption

Ijaz Hussain; Yang Li; Junwen Qi; Jiansheng Li; Lianjun Wang

doi:10.1016/j.jenvman.2018.03.051

Nitrogen-enriched carbon sheet for Methyl blue dye adsorption

J Environ Manage. 2018 Jun 1:215:123-131. doi: 10.1016/j.jenvman.2018.03.051. Epub 2018 Mar 19.

Authors

Ijaz Hussain¹, Yang Li¹, Junwen Qi¹, Jiansheng Li², Lianjun Wang¹

Affiliations

¹ Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
² Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China. Electronic address: lijsh@mail.njust.edu.cn.

PMID: 29567552
DOI: 10.1016/j.jenvman.2018.03.051

Abstract

In this work, nitrogen-enriched carbon sheet (NECS) was successfully fabricated by using sodium gluconate as a carbon source via melamine assisted chemical blowing approach. The obtained material exhibits sheet-like morphology with ultra-thin thickness and has a high specific surface area of 604 m²g^-1 and high nitrogen contents of 11.2 wt%. The NECS showed an excellent adsorption performance towards the removal of anionic dye Methyl blue (a-Mb). The adsorption of a-Mb onto NECS better fitted the Langmuir isotherm model with the highest adsorption capacity of 847 mg g^-1. Interestingly, the NECS showed a pH-sensitive behavior towards the adsorption efficiency of a-Mb dye in which the adsorption capacity abruptly increased from 34 to 701 mg g^-1 when the pH of the solution was decreased from 10 to 2. Furthermore, the adsorbed materials can be easily regenerated without obvious efficiency loss over a five adsorption-desorption cycles.

Keywords: Adsorbent; Methyl blue removal; Nitrogen-enriched carbon sheet; Regeneration; pH-sensitive behavior.

MeSH terms

Adsorption
Benzenesulfonates / chemistry*
Benzenesulfonates / isolation & purification
Carbon*
Kinetics
Methylene Blue
Nitrogen
Water Pollutants, Chemical / chemistry*
Water Pollutants, Chemical / isolation & purification
Water Purification

Substances

Benzenesulfonates
Water Pollutants, Chemical
Carbon
Methyl Blue
Nitrogen
Methylene Blue