[Scientific Reports] Hierarchically Porous Silicon-Carbon-Nitrogen Hybrid Materials towards Highly Efficient and Selective Adsorption of Organic Dyes
作者：Lala Meng, Xiaofei Zhang, Yusheng Tang, Kehe Su and Jie Kong*
關鍵字：Hybrid Materials
論文來源：期刊
具體來源：Scientific Reports, 2015, 5: 7910, doi: 10.1038/srep0791
發表時間：2015年
The hierarchicallymacro/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 sp2-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 and 1084.5 mg/g for MB and AF, respectively, which is much higher than that of many other adsorbents. On the contrary, the hybridmaterials 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.