Department of Chemistry, University of Turin, Via P. Giuria 7, 10125, Turin, Italy.
Department of Applied Science and Technology, Polytechnic of Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy.
Environ Sci Pollut Res Int. 2018 Apr;25(11):10619-10629. doi: 10.1007/s11356-018-1367-x. Epub 2018 Jan 30.
The presence of residual color in treated textile wastewater above the regulation limits is still a critical issue in many textile districts. Innovative, polymer-derived ceramics of the Si-C-O system were here synthesized in order to obtain porous nanocomposite materials where a free carbon phase is dispersed into a silicon carbide/silicon oxycarbide network. The sorbents were comprehensively characterized for the removal of two model water-soluble dyes (i.e., the cation methylene blue and the zwitterion rhodamine B). Adsorption is very rapid and controlled by intra-particle and/or film diffusion, depending on dye concentration. Among the nanocomposites studied, the SiOC aerogel (total capacity about 45 mg/g, is easily regenerated under mild treatment (250 °C, 2 h). Adsorption of dyes is not affected by the matrix composition: removals of 150 mg/L methylene blue from river water and simulated textile wastewater with high content of metal ions (2-50 mg/L) and chemical oxygen demand (800 mg/L) were higher than 92% and quantitative for a dye concentration of 1 mg/L.
处理后的纺织废水中残留颜色超过规定限值仍然是许多纺织区的一个关键问题。为了获得多孔纳米复合材料，其中自由碳相分散在碳化硅/硅氧碳网络中，在此合成了 Si-C-O 系统的创新性聚合物衍生陶瓷。对吸附剂进行了全面的表征，以去除两种模型水溶性染料（即阳离子亚甲蓝和两性离子罗丹明 B）。吸附非常迅速，受颗粒内和/或膜扩散控制，具体取决于染料浓度。在所研究的纳米复合材料中，SiOC 气凝胶（总容量约为 45mg/g，在温和条件下（250°C，2h）很容易再生。染料的吸附不受基质组成的影响：从河水中和含有高浓度金属离子（2-50mg/L）和化学需氧量（800mg/L）的模拟纺织废水中去除 150mg/L 亚甲蓝的去除率高于 92%，对于 1mg/L 的染料浓度则达到定量去除。
