Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Chongqing Yuxi Water Co., Ltd, Chongqing 402160, China.
Sci Total Environ. 2018 Dec 15;645:937-945. doi: 10.1016/j.scitotenv.2018.07.197. Epub 2018 Jul 20.
Calcium silicate hydrate (CSH) is a popular material used for phosphorus removal in recent years. In this work, a novel immobilized material, polyvinyl alcohol-CSH (PVA-CSH), was prepared using a 1:10 weight ratio of CSH powder to 8% PVA solution and then used for phosphorus removal. Samples were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The adsorption mechanism and practical application properties of phosphorus wastewater were studied by sequential batch and continuous flow experiment. The results showed PVA-CSH possessed a porous network structure and an average pore diameter of 24.94 ± 0.11 nm. Furthermore, the CSH functional groups were unaffected by PVA immobilization. Compared with CSH, PVA-CSH did not easily lose CSH after being immobilized by PVA, and the duration of efficient phosphorus removal stage was approximately 20 h longer than that of CSH. In addition, the effluent turbidity of PVA-CSH was 0.11 ± 0.03 NTU during the continuous operation period, which was significantly lower than CSH. In summary, this research study demonstrated the significant potential of PVA-CSH for practical phosphorus removal.
硅酸钙水合物（CSH）是近年来用于除磷的一种受欢迎的材料。在这项工作中，使用 CSH 粉末与 8%PVA 溶液的重量比为 1:10 制备了一种新型固定化材料聚乙烯醇-CSH（PVA-CSH），并用于除磷。通过扫描电子显微镜（SEM）、能谱（EDS）、X 射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对样品进行了表征。通过序批和连续流动实验研究了磷废水的吸附机理和实际应用性能。结果表明，PVA-CSH 具有多孔网络结构，平均孔径为 24.94±0.11nm。此外，CSH 官能团不受 PVA 固定化的影响。与 CSH 相比，PVA-CSH 被 PVA 固定后不易失去 CSH，有效除磷阶段的持续时间比 CSH 长约 20h。此外，在连续运行期间，PVA-CSH 的出水浊度为 0.11±0.03NTU，明显低于 CSH。总之，这项研究表明 PVA-CSH 具有实际除磷的巨大潜力。
