Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
School of Life Sciences, Nanjing University, No.163 Xianlin Road, Nanjing 210023, China.
Int J Environ Res Public Health. 2023 Feb 4;20(4):2793. doi: 10.3390/ijerph20042793.
In order to address the growing problem of water pollution caused by the excessive discharge of contaminants and provide a better aquatic ecosystem for the public, increasing attention has been paid to the harmlessness and efficiency of coagulation. In this study, polyaluminum lanthanum silicate (PALS) was synthesized through co-polymerization as a novel coagulant to treat wastewater. FTIR, XRD, and SEM were used to analyze the morphology and structure of the material, which further confirmed that the PALS was successfully synthesized. The results indicated that PALS had a great performance in the treatment of a kaolin-humic acid suspension under the optimal synthesis conditions with Al/Si = 3, La/Si = 0.1, and basicity = 0.7. Compared with conventional coagulants, PALS exhibited a better performance at a low coagulant dose and could achieve a good removal effect for an ultraviolet wavelength less than 254 nm (UV) (83.87%), residual turbidity (0.49 NTU), and dissolved organic carbon (DOC) (69.57%) at the optimal conditions. Additionally, the PALS showed a better effect on phosphate removal than other coagulants did, where the removal efficiency could reach 99.60%. Charge neutralization and adsorption bridging were the potential wastewater treatment mechanisms employed by the PALS, which showed varied contributions under different pH levels. The results indicated that PALS can be a promising coagulant in water treatment.
为了解决由于污染物过度排放而导致的水污染日益严重的问题，为公众提供更好的水生生态系统，人们越来越关注混凝的无害性和效率。在这项研究中，通过共聚合成了聚硅铝镧（PALS）作为一种新型混凝剂来处理废水。傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）和扫描电子显微镜（SEM）用于分析材料的形态和结构，进一步证实了 PALS 的成功合成。结果表明，在 Al/Si = 3、La/Si = 0.1 和碱度 = 0.7 的最佳合成条件下，PALS 对高岭土-腐殖酸悬浮液的处理具有很好的性能。与传统混凝剂相比，PALS 在低投加量下表现出更好的性能，在最佳条件下可以达到良好的去除效果，对紫外波长小于 254nm（UV）（83.87%）、残余浊度（0.49NTU）和溶解有机碳（DOC）（69.57%）。此外，PALS 对磷酸盐的去除效果优于其他混凝剂，去除效率可达 99.60%。电中和和吸附架桥是 PALS 处理废水的潜在机制，在不同的 pH 值下表现出不同的贡献。结果表明，PALS 可以成为水处理中一种有前途的混凝剂。
