1. Evaluation a self-assembled anionic polyacrylamide flocculant for the treatment of hematite wastewater: Role of microblock structure.
- Author
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Zhang, Shixin, Zheng, Huaili, Tang, Xiaomin, Sun, Yongjun, Wu, Yexuan, Zheng, Xinyu, and Sun, Qiang
- Subjects
ANIONS ,POLYACRYLAMIDE ,FLOCCULANTS ,HEMATITE ,SEWAGE - Abstract
Highlights • A self-assembly anionic polyacrylamide was prepared via template polymerization and ultrasonic initiation. • Microblock structure in TPAS-U improved its charge neutralization and bridging in flocculation. • Microblock structure strengthened the recombination of flocs after fragmentation. • TPAS-U performed better in the treatment of hematite wastewater comparing with other APAM. Abstract Self-assembly is able to control molecular structure of flocculants and improves their flocculation efficiency. In this study, template polymerization and ultrasonic initiation system attributed to the self-assembly of anionic polyacrylamide (TPAS-U) with a microblock structure using acrylamide (AM) and sodium p-styrene sulfonate (SSS) as monomers and poly (allylammonium chloride) (PAAC) as template. The functional groups and ordered microblock structure in TPAS-U were discovered via characterization analysis. Association constant (K M) manifested the self-assembly mechanism. And the role of ultrasonic in the synthesis was discussed as well. TPAS-U with well-organized/special structure had excellent flocculation performance in the treatment of hematite wastewater over other anionic flocculants. The flocs formed by TPAS-U possessed the big size, the compact structure and the strong recover ability after breakage. The uniform and regular microblock structure in TPAS-U attributed to the high utilization efficiency of negative charges, which improved neutralization, adsorption and bridging in the treatment. Graphical abstract Image, graphical abstract [ABSTRACT FROM AUTHOR]
- Published
- 2019
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