title: Removal of both cationic and anionic contaminants by amphoteric starch.
abstract: A novel amphoteric starch incorporating quaternary ammonium and phosphate groups was applied to investigate the efficiency and mechanism of cationic and anionic contaminant treatment. Its flocculation abilities for kaolin suspension and copper-containing wastewater were evaluated by turbidity reduction and copper removal efficiency, respectively. And the kinetics of formation, breakage and subsequent re-formation of aggregates were monitored using a Photometric Dispersion Analyzer (PDA) and characterized by flocculation index (FI). The results showed that amphoteric starch possessed the advantages of being lower-dosages-consuming and being stronger in shear resistance than cationic starch, and exhibited a good flocculation efficiency over a wide pH range from 3.0 to 11.0.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Huanlong
authors.initials: H
authors.lastname: Peng
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Songxiong
authors.initials: S
authors.lastname: Zhong
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. Electronic address: qintlin@163.com.
authors.forename: Qintie
authors.initials: Q
authors.lastname: Lin
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Yao
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Zhuoying
authors.initials: Z
authors.lastname: Liang
authors.affiliation: Department of Biomedical Engineering, Tsinghua University, Beijing 100083, PR China.
authors.forename: Muqun
authors.initials: M
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Guangcai
authors.initials: G
authors.lastname: Yin
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Qianjun
authors.initials: Q
authors.lastname: Liu
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: He
keywords: Amphoteric starch; Buffering capacity; Phosphate group; Shear resistance