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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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XPS spectra of porous Si–C–N hybrid material from precursor (PSZ:PDVB:NiCp2  = 1:2:0.04) pyrolyzed at 600°C (C1).
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f6: XPS spectra of porous Si–C–N hybrid material from precursor (PSZ:PDVB:NiCp2 = 1:2:0.04) pyrolyzed at 600°C (C1).

Mentions: The detailed structure of porous Si–C–N hybrid material (PSZ:PDVB:NiCp2 = 1:2:0.04) pyrolyzed at 600°C was evaluated by XPS as presented in Figure 6 and the according atomic composition was listed in Table 1. Obviously, the material is mainly composed of silicon, carbon, nitrogen, and nickel elements, although the peak corresponding to Ni2p is not observed because of its lower content. The Si2p peak is deconvoluted into the C–Si–O, N–Si–N, N–Si–O, and Si–Ox peaks4344. The C1s peak is decomposed into the C–Si, C = C, C–C, C–O–H, and C = O peaks454647, and the N1s peak is deconvoluted into the Si–N–C, Si–Nx, and Si–N–O peaks48. The excess content of oxygen in the 5–10 nm surface of porous material measured by XPS is mainly due to the O2 absorption by powder sample before measurement. Simultaneously, a little oxygen might be obtained from the polysilazane precursors employed in the preparation.


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)

XPS spectra of porous Si–C–N hybrid material from precursor (PSZ:PDVB:NiCp2  = 1:2:0.04) pyrolyzed at 600°C (C1).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: XPS spectra of porous Si–C–N hybrid material from precursor (PSZ:PDVB:NiCp2 = 1:2:0.04) pyrolyzed at 600°C (C1).
Mentions: The detailed structure of porous Si–C–N hybrid material (PSZ:PDVB:NiCp2 = 1:2:0.04) pyrolyzed at 600°C was evaluated by XPS as presented in Figure 6 and the according atomic composition was listed in Table 1. Obviously, the material is mainly composed of silicon, carbon, nitrogen, and nickel elements, although the peak corresponding to Ni2p is not observed because of its lower content. The Si2p peak is deconvoluted into the C–Si–O, N–Si–N, N–Si–O, and Si–Ox peaks4344. The C1s peak is decomposed into the C–Si, C = C, C–C, C–O–H, and C = O peaks454647, and the N1s peak is deconvoluted into the Si–N–C, Si–Nx, and Si–N–O peaks48. The excess content of oxygen in the 5–10 nm surface of porous material measured by XPS is mainly due to the O2 absorption by powder sample before measurement. Simultaneously, a little oxygen might be obtained from the polysilazane precursors employed in the preparation.

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