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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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Thermograms of P1 (pure sacrificial filler), P2 (NiCp2 containing polysilazane), and P3 (polysilazane containing NiCp2 and sacrificial filler) obtained from simultaneous analysis by TGA/DSC under an argon atmosphere at a scanning rate of 10 K min−1, (a) TGA curves, (b) DSC curves.
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f3: Thermograms of P1 (pure sacrificial filler), P2 (NiCp2 containing polysilazane), and P3 (polysilazane containing NiCp2 and sacrificial filler) obtained from simultaneous analysis by TGA/DSC under an argon atmosphere at a scanning rate of 10 K min−1, (a) TGA curves, (b) DSC curves.

Mentions: Figure 3 shows the pyrolysis behaviors of P1 (pure PDVB sacrificial filler), P2 (NiCp2 containing polysilazane), and P3 (polysilazane with NiCp2 and sacrificial filler) under nitrogen by simultaneous TGA and DSC. From the TGA curves in Figure 2a, the PDVB undergoes a dramatic thermolytic degradation in the temperature range from 430 to 500°C, in correspondence with a significant exothermic peak as presented in DSC curve (Figure 3b). The weight loss is about 80% at 1,000°C, indicating that the cross-linked PDVB microspheres retain a few residues after pyrolysis. Subsequently, for the P2 (PSZ:NiCp2 = 1:0.04), a weight loss of 15% is observed within the temperature range from 450 to 800°C. Above 800°C, the TGA curve remains almost constant until 1,200°C. The sharp endothermic peak at around 170°C is related to the cross-linking reaction involving radical polymerization of vinyl groups and hydrosilylation between vinyl group and silicon hydrogen bond36. In terms of P3 (PSZ:PDVB:NiCp2 = 1:1:0.04), a remarkable weight loss is observed from 430 to 800°C, which is attributed to the decomposition of PDVB and chain scission of PSZ detected by simultaneous mass spectrometry.


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)

Thermograms of P1 (pure sacrificial filler), P2 (NiCp2 containing polysilazane), and P3 (polysilazane containing NiCp2 and sacrificial filler) obtained from simultaneous analysis by TGA/DSC under an argon atmosphere at a scanning rate of 10 K min−1, (a) TGA curves, (b) DSC curves.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Thermograms of P1 (pure sacrificial filler), P2 (NiCp2 containing polysilazane), and P3 (polysilazane containing NiCp2 and sacrificial filler) obtained from simultaneous analysis by TGA/DSC under an argon atmosphere at a scanning rate of 10 K min−1, (a) TGA curves, (b) DSC curves.
Mentions: Figure 3 shows the pyrolysis behaviors of P1 (pure PDVB sacrificial filler), P2 (NiCp2 containing polysilazane), and P3 (polysilazane with NiCp2 and sacrificial filler) under nitrogen by simultaneous TGA and DSC. From the TGA curves in Figure 2a, the PDVB undergoes a dramatic thermolytic degradation in the temperature range from 430 to 500°C, in correspondence with a significant exothermic peak as presented in DSC curve (Figure 3b). The weight loss is about 80% at 1,000°C, indicating that the cross-linked PDVB microspheres retain a few residues after pyrolysis. Subsequently, for the P2 (PSZ:NiCp2 = 1:0.04), a weight loss of 15% is observed within the temperature range from 450 to 800°C. Above 800°C, the TGA curve remains almost constant until 1,200°C. The sharp endothermic peak at around 170°C is related to the cross-linking reaction involving radical polymerization of vinyl groups and hydrosilylation between vinyl group and silicon hydrogen bond36. In terms of P3 (PSZ:PDVB:NiCp2 = 1:1:0.04), a remarkable weight loss is observed from 430 to 800°C, which is attributed to the decomposition of PDVB and chain scission of PSZ detected by simultaneous mass spectrometry.

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