A composite flocculant (PSAS-CS) consisted of cationic starch (CS) and polyaluminum silicate (PSAS) was prepared and used for the flocculation of simulated water samples. The morphology and structure of PSAS-CS were characterized by X-ray diffraction, scanning electron microscopy, and infrared spectroscopy. The effect of flocculation conditions such as the flocculant dosage and the simulated water pH were investigated. The turbidity and color removal rates could reach 97.79% and 98.07% at PSAS-CS dosage of 1.5 mL/L and the simulated water pH of 5–9. Furthermore, the flocculation efficiency of PSAS-CS was compared with PSAS, CS and the starch modified polyaluminum silicate at different dosage. The results indicated that PSAS-CS showed the highest flocculation efficiency due to its plentiful of positive charges and extended molecular chain. Moreover, the removal rate of PSAS-CS could remain 85% at a low dosage of 0.2 mL/L.
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The present work is supported by the projects of Science and Technology Development of Jilin Province (20190303116SF), Natural Science Foundation of Jilin Province (20180101292JC), the Research Foundation of Education Bureau of Jilin Province (JJKH20200238KJ), and the Science Foundation for Distinguished Young Scholars of Jilin City (No. 20190104158). Financial support from the Key Laboratory of Fine Chemicals of Jilin Province is also acknowledged.
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Li, Y., Zhang, H., Wang, X. et al. Preparation and Flocculation Performance of Polysilicate Aluminum-Cationic Starch Composite Flocculant. Water Air Soil Pollut 231, 339 (2020). https://doi.org/10.1007/s11270-020-04711-x
- Polyaluminum silicate
- Cationic starch
- Composite flocculant
- Removal rate