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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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Schematic illustration of preparation of hierarchically porous silicon–carbon–nitrogen hybrid materials from a pyrolysis of polysilazane and nickelocene by using polydivinylbenzene (PDVB) microspheres.
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f1: Schematic illustration of preparation of hierarchically porous silicon–carbon–nitrogen hybrid materials from a pyrolysis of polysilazane and nickelocene by using polydivinylbenzene (PDVB) microspheres.

Mentions: In this contribution, the hierarchically macro/micro-porous Si–C–N hybrid materials were prepared by pyrolysis of polysilazane (PSZ) at a low temperature using sacrificial fillers of polydivinylbenzene microspheres (PDVB) as schematically illustrated in Figure 1. Interestingly, the porous hybrid material exhibited highly efficient and totally selective adsorption properties for triphenylmethane dyes. Thus, the Si–C–N hybrid material, which can be mass-produced at a low cost, possesses promising potential as a novel adsorbent for the separation of organic dyes illustrated in Figure 2 (methyl blue (MB), acid fuchsin (AF), basic fuchsin (BF), methyl violet (MV), malachite green (MG), methyl orange (MO), congro red (CR) and methyl red (MR)) from aqueous solution.


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)

Schematic illustration of preparation of hierarchically porous silicon–carbon–nitrogen hybrid materials from a pyrolysis of polysilazane and nickelocene by using polydivinylbenzene (PDVB) microspheres.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Schematic illustration of preparation of hierarchically porous silicon–carbon–nitrogen hybrid materials from a pyrolysis of polysilazane and nickelocene by using polydivinylbenzene (PDVB) microspheres.
Mentions: In this contribution, the hierarchically macro/micro-porous Si–C–N hybrid materials were prepared by pyrolysis of polysilazane (PSZ) at a low temperature using sacrificial fillers of polydivinylbenzene microspheres (PDVB) as schematically illustrated in Figure 1. Interestingly, the porous hybrid material exhibited highly efficient and totally selective adsorption properties for triphenylmethane dyes. Thus, the Si–C–N hybrid material, which can be mass-produced at a low cost, possesses promising potential as a novel adsorbent for the separation of organic dyes illustrated in Figure 2 (methyl blue (MB), acid fuchsin (AF), basic fuchsin (BF), methyl violet (MV), malachite green (MG), methyl orange (MO), congro red (CR) and methyl red (MR)) from aqueous solution.

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