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Hierarchically porous silicon-carbon-nitrogen hybrid materials towards highly efficient and selective adsorption of organic dyes.

Meng L, Zhang X, Tang Y, Su K, Kong J - Sci Rep (2015)

Bottom Line: The hybrid material was conveniently generated by the pyrolysis of commercial polysilazane precursors using polydivinylbenzene microspheres as sacrificial templates.On the contrary, the hybrid materials do not adsorb the dyes with azo benzene structures, such as methyl orange, methyl red and congro red.Thus, the hierarchically porous Si-C-N hybrid material from a facile and low cost polymer-derived strategy provides a new perspective and possesses a significant potential in the treatment of wastewater with complex organic pollutants.

View Article: PubMed Central - PubMed

Affiliation: MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi'an, 710072, P. R. China.

ABSTRACT
The hierarchically macro/micro-porous silicon-carbon-nitrogen (Si-C-N) hybrid material was presented with novel functionalities of totally selective and highly efficient adsorption for organic dyes. The hybrid material was conveniently generated by the pyrolysis of commercial polysilazane precursors using polydivinylbenzene microspheres as sacrificial templates. Owing to the Van der Waals force between sp-hybridized carbon domains and triphenyl structure of dyes, and electrostatic interaction between dyes and Si-C-N matrix, it exhibites high adsorption capacity and good regeneration and recycling ability for the dyes with triphenyl structure, such as methyl blue (MB), acid fuchsin (AF), basic fuchsin and malachite green. The adsorption process is determined by both surface adsorption and intraparticle diffusion. According to the Langmuir model, the adsorption capacity is 1327.7 mg·g(-1) and 1084.5 mg·g(-1) for MB and AF, respectively, which is much higher than that of many other adsorbents. On the contrary, the hybrid materials do not adsorb the dyes with azo benzene structures, such as methyl orange, methyl red and congro red. Thus, the hierarchically porous Si-C-N hybrid material from a facile and low cost polymer-derived strategy provides a new perspective and possesses a significant potential in the treatment of wastewater with complex organic pollutants.

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SEM images of Si–C–N porous materials from precursors with a PSZ:PDVB:NiCp2 of (a) 1:0.3:0.04, (b) 1:0.5:0.04, (c) 1:1:0.04, (d) 1:2:0.04.
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f7: SEM images of Si–C–N porous materials from precursors with a PSZ:PDVB:NiCp2 of (a) 1:0.3:0.04, (b) 1:0.5:0.04, (c) 1:1:0.04, (d) 1:2:0.04.

Mentions: For the preparation of porous material by sacrifice filler template, the porous structure is in correspondence with the template size. Furthermore, the content of template material also has a considerable influence on the subsequent structures in terms of interconnectivity, porosity, and wall thickness. The pyrolyzed porous structures were obtained by PSZ precursors with varied percentage of PDVB. The pyrolysis temperature was maintained at 750°C. The SEM images in Figure 7 exhibit that the porous materials possess an expected regular morphology comprised of pores. It can be clearly seen that the isolated pores are distributed uniformly in matrix when the content of filler template is relatively low. When the content of microsphere fillers is increased, the distance between the isolated pores becomes smaller and the non-contact microspheres tend to come in contact with each other to form a highly porous component. Furthermore, when the content of microsphere fillers is increased to 200%, the interconnected cellular chunks are produced and the volume of voids in the matrix increases continuously.


Hierarchically porous silicon-carbon-nitrogen hybrid materials towards highly efficient and selective adsorption of organic dyes.

Meng L, Zhang X, Tang Y, Su K, Kong J - Sci Rep (2015)

SEM images of Si–C–N porous materials from precursors with a PSZ:PDVB:NiCp2 of (a) 1:0.3:0.04, (b) 1:0.5:0.04, (c) 1:1:0.04, (d) 1:2:0.04.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4300473&req=5

f7: SEM images of Si–C–N porous materials from precursors with a PSZ:PDVB:NiCp2 of (a) 1:0.3:0.04, (b) 1:0.5:0.04, (c) 1:1:0.04, (d) 1:2:0.04.
Mentions: For the preparation of porous material by sacrifice filler template, the porous structure is in correspondence with the template size. Furthermore, the content of template material also has a considerable influence on the subsequent structures in terms of interconnectivity, porosity, and wall thickness. The pyrolyzed porous structures were obtained by PSZ precursors with varied percentage of PDVB. The pyrolysis temperature was maintained at 750°C. The SEM images in Figure 7 exhibit that the porous materials possess an expected regular morphology comprised of pores. It can be clearly seen that the isolated pores are distributed uniformly in matrix when the content of filler template is relatively low. When the content of microsphere fillers is increased, the distance between the isolated pores becomes smaller and the non-contact microspheres tend to come in contact with each other to form a highly porous component. Furthermore, when the content of microsphere fillers is increased to 200%, the interconnected cellular chunks are produced and the volume of voids in the matrix increases continuously.

Bottom Line: The hybrid material was conveniently generated by the pyrolysis of commercial polysilazane precursors using polydivinylbenzene microspheres as sacrificial templates.On the contrary, the hybrid materials do not adsorb the dyes with azo benzene structures, such as methyl orange, methyl red and congro red.Thus, the hierarchically porous Si-C-N hybrid material from a facile and low cost polymer-derived strategy provides a new perspective and possesses a significant potential in the treatment of wastewater with complex organic pollutants.

View Article: PubMed Central - PubMed

Affiliation: MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi'an, 710072, P. R. China.

ABSTRACT
The hierarchically macro/micro-porous silicon-carbon-nitrogen (Si-C-N) hybrid material was presented with novel functionalities of totally selective and highly efficient adsorption for organic dyes. The hybrid material was conveniently generated by the pyrolysis of commercial polysilazane precursors using polydivinylbenzene microspheres as sacrificial templates. Owing to the Van der Waals force between sp-hybridized carbon domains and triphenyl structure of dyes, and electrostatic interaction between dyes and Si-C-N matrix, it exhibites high adsorption capacity and good regeneration and recycling ability for the dyes with triphenyl structure, such as methyl blue (MB), acid fuchsin (AF), basic fuchsin and malachite green. The adsorption process is determined by both surface adsorption and intraparticle diffusion. According to the Langmuir model, the adsorption capacity is 1327.7 mg·g(-1) and 1084.5 mg·g(-1) for MB and AF, respectively, which is much higher than that of many other adsorbents. On the contrary, the hybrid materials do not adsorb the dyes with azo benzene structures, such as methyl orange, methyl red and congro red. Thus, the hierarchically porous Si-C-N hybrid material from a facile and low cost polymer-derived strategy provides a new perspective and possesses a significant potential in the treatment of wastewater with complex organic pollutants.

Show MeSH