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

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...

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Bibliographic Details
Published in:Scientific reports 2015-01, Vol.5 (1), p.7910-7910, Article 7910
Main Authors: Meng, Lala, Zhang, Xiaofei, Tang, Yusheng, Su, Kehe, Kong, Jie
Format: Article
Language:English
Subjects:
140/133
140/146
147/135
639/301
704/172/169/896
Adsorption
Azo dyes
Benzene
Carbon
Carbon - chemistry
Coloring Agents - chemistry
Dyes
Electrostatic properties
Humanities and Social Sciences
Hybridization
Microspheres
multidisciplinary
Nitrogen
Nitrogen - chemistry
Pollutants
Polymers
Pyrolysis
Science
Silicon
Silicon - chemistry
Wastewater treatment
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Summary: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 2 -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.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep07910