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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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The simultaneous TGA and mass spectrometry of P3 (PSZ:PDVB:NiCp2 = 1:1:4).
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f4: The simultaneous TGA and mass spectrometry of P3 (PSZ:PDVB:NiCp2 = 1:1:4).

Mentions: Figure 4 shows the analysis of simultaneous TGA and mass spectrometry of P3. For the comparison, the analysis was also performed for P0 (native polysilazane), P1 (pure sacrificial filler) and P2 (NiCp2 containing polysilazane) as presented in Figure S3. There exist two peaks for P3, i.e., peaks maximum at 430 and 600°C. According to the thermalgrams of P1 and P2, the first set of peaks for P3 are mainly corresponding to the decomposition products of PDVB (H2, m/z = 2, hydrocarbons CHx, x = 1–4, m/z = 14–16, NH3, m/z = 17, CHxCHy, m/z = 25, 26, and 28) as well as other oligomer fragments (m/z = 38–74). However, another group of peaks is mainly attributed to cleavage of PSZ (H2, m/z = 2, hydrocarbons CHx, x = 1–4, m/z = 132–16, NH3, m/z = 17, CHxCHy, m/z = 25, 26, and 28).


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)

The simultaneous TGA and mass spectrometry of P3 (PSZ:PDVB:NiCp2 = 1:1:4).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: The simultaneous TGA and mass spectrometry of P3 (PSZ:PDVB:NiCp2 = 1:1:4).
Mentions: Figure 4 shows the analysis of simultaneous TGA and mass spectrometry of P3. For the comparison, the analysis was also performed for P0 (native polysilazane), P1 (pure sacrificial filler) and P2 (NiCp2 containing polysilazane) as presented in Figure S3. There exist two peaks for P3, i.e., peaks maximum at 430 and 600°C. According to the thermalgrams of P1 and P2, the first set of peaks for P3 are mainly corresponding to the decomposition products of PDVB (H2, m/z = 2, hydrocarbons CHx, x = 1–4, m/z = 14–16, NH3, m/z = 17, CHxCHy, m/z = 25, 26, and 28) as well as other oligomer fragments (m/z = 38–74). However, another group of peaks is mainly attributed to cleavage of PSZ (H2, m/z = 2, hydrocarbons CHx, x = 1–4, m/z = 132–16, NH3, m/z = 17, CHxCHy, m/z = 25, 26, and 28).

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