Polymagnesium silicate sulfate (PMSiS) was prepared by using magnesium sulfate modified polysilicic acid (PSiA). The PMSiS’s functional group and morphology were analyzed by FTIR and SEM, respectively. The coagulation performance of PMSiS and PSiA was studied and compared in terms of the Congo red (CR) dye removal efficiency. After modification, PMSiS was a complexation polymeric species with the compact rod-like structure. Compared with PSiA, PMSiS was more efficient and stable. In the process of treating simulated wastewater containing CR dye, the dye removal efficiency of PMSiS could achieve above 80% at the lower coagulant dosage of 0.4 g/L, while the dye removal efficiency of PSiA could only reach about 70% at the higher coagulant dosage of 1.2 g/L. Moreover, PMSiS had wider applicable range of dosage and temperature than PSiA at optimal conditions of pH 12 and once addition of feeding mode. Therefore, PMSiS will be a promising coagulant in the process of treating practical wastewater containing dyes.

中文翻译：

---

聚硅酸 (PSiA) 和硫酸镁改性聚硅酸 (PMSiS) 有效去除模拟废水中刚果红的比较

采用硫酸镁改性聚硅酸（PSiA）制备聚硅酸镁硫酸盐（PMSiS）。PMSiS 的官能团和形态分别通过 FTIR 和 SEM 进行分析。研究了 PMSiS 和 PSiA 的混凝性能，并在刚果红 (CR) 染料去除效率方面进行了比较。改性后的 PMSiS 是一种具有致密棒状结构的络合聚合物。与 PSiA 相比，PMSiS 更高效、更稳定。在处理含CR染料的模拟废水过程中，在0.4 g/L的较低混凝剂用量下，PMSiS的脱色效率可达80%以上，而在较高混凝剂用量下，PSiA的脱色效率仅能达到70%左右。用量为1.2克/升。而且，PMSiS在pH 12的最佳条件和一次添加进料模式下比PSiA具有更宽的剂量和温度适用范围。因此，PMSiS 将成为处理实际含染料废水过程中的一种很有前途的混凝剂。