scholarly journals Studies on Kinetics, Isotherms, Thermodynamics and Adsorption Mechanism of Methylene Blue by N and S Co-Doped Porous Carbon Spheres

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1819
Author(s):  
Yongpeng Ren ◽  
Feng Chen ◽  
Kunming Pan ◽  
Yang Zhao ◽  
Lulu Ma ◽  
...  

Heteroatom-doped carbon is widely used in the fields of adsorbents, electrode materials and catalysts due to its excellent physicochemical properties. N and S co-doped porous carbon spheres (N,S-PCSs) were synthesized using glucose and L-cysteine as carbon and heteroatom sources using a combined hydrothermal and KOH activation process. The physicochemical structures and single-factor methylene blue (MB) adsorption properties of the N,S-PCSs were then studied. The optimized N,S-PCSs-1 possessed a perfect spherical morphology with a 2–8-μm diameter and a large specific area of 1769.41 m2 g−1, in which the N and S contents were 2.97 at% and 0.88 at%, respectively. In the single-factor adsorption experiment for MB, the MB adsorption rate increased with an increase in carbon dosage and MB initial concentration, and the adsorption reached equilibrium within 2–3 h. The pseudo-second-order kinetic model could excellently fit the experimental data with a high R2 (0.9999). The Langmuir isothermal adsorption equation fitted well with the experimental results with an R2 value of 0.9618, and the MB maximum adsorption quantity was 909.10 mg g−1. The adsorption of MB by N,S-PCSs-1 was a spontaneous, endothermic, and random process based on the thermodynamics analyses. The adsorption mechanism mainly involved Van der Waals force adsorption, π-π stacking, hydrogen bonds and Lewis acid–base interactions.

2018 ◽  
Vol 6 (12) ◽  
pp. 16032-16038 ◽  
Author(s):  
Guangyuan Ren ◽  
Yunan Li ◽  
Quanshui Chen ◽  
Yong Qian ◽  
Jugong Zheng ◽  
...  

RSC Advances ◽  
2020 ◽  
Vol 10 (19) ◽  
pp. 11033-11038 ◽  
Author(s):  
Yan Lv ◽  
Jingjing Chen ◽  
Wei Jia ◽  
Xueyan Wu ◽  
Jixi Guo ◽  
...  

N/S co-doped porous carbon spheres were prepared using one step strategy for high performance supercapacitors.


Author(s):  
Zenghua Xu ◽  
Ximing Zhang ◽  
Xufeng Yang ◽  
Youfang Yu ◽  
Hongjian Lin ◽  
...  

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 38880-38886 ◽  
Author(s):  
Gengnan Li ◽  
Binghan Wu ◽  
Liang Li

A facile protocol for producing porous carbon spheres co-doped with nitrogen and sulfur is presented.


2015 ◽  
Vol 51 (100) ◽  
pp. 17720-17723 ◽  
Author(s):  
Shuzhang Niu ◽  
Wei Lv ◽  
Guangmin Zhou ◽  
Yanbing He ◽  
Baohua Li ◽  
...  

N and S co-doped porous carbon microspheres (NS-PCSs) prepared by using a dual functional agent, l-cysteine, show outstanding electrochemical performance in lithium sulfur batteries.


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