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Formation of Al-30 aggregates and its correlation to the coagulation effect
Liu, Libing; Lu, Sen; Demissie, Hailu; Yue, Ye; Jiao, Ruyuan; An, Guangyu; Wang, Dongsheng
Source PublicationCHEMOSPHERE
AbstractAl-30 is the polycation with the highest degree of polymerization and surface charge in the currently known structural aluminum species. It shows excellent coagulation performance in water treatment process, and has the characteristics of wide application range of pH and dosage. pH value is one of the most important factors affecting the aggregation and coagulation process of Al-30, but the influence of Al-30 aggregation reaction on its coagulation effect is still unclear. Therefore, this article reports the deprotonation and aggregation reaction of Al-30 by adjusting the basicity (B) of the solution, particularly to further understand the coagulation mechanism of Al-30 under different conditions. The results showed that in the base titration process, when B < 2.86 in 0.01 M Al-30 solution as Al-T (the concentration of total Al), deprotonation and preliminary aggregation mainly occurred; when B > 2.86, the size of Al-30 aggregates (Al(30)agg) increased rapidly, forming gels and gradually transforming into Al(OH)(3). In this process, in addition to the reduction of electrostatic repulsion induced by Al-30 deprotonation, the oligomers generated by the partial dissociation of Al-30 also play the role of bridging-connection. Under the experimental titration conditions, the Al(30)agg always maintained a positive zeta potential. In addition, Al-30 can deprotonate and aggregate at lower pH, which is an important reason for its unique coagulation characteristics. The larger structure size of Al-30 also made it easy to form branched aggregates, so that it can play an effective role in a wider dosage range without destabilization of colloids. This study gives an insight in the advancement of coagulants and promotes the industrial application and commercialization of functional coagulants based on polyaluminum. (C) 2021 Elsevier Ltd. All rights reserved.
KeywordAl-30 Aggregation Basicity Mechanism Coagulation
WOS Research AreaEnvironmental Sciences
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, 18 Shuangqing Rd, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Yangtze River Delta Branch, Yiwu 322000, Zhejiang, Peoples R China
4.Arba Minch Univ, Dept Chem, Arba Minch 1000, Ethiopia
Recommended Citation
GB/T 7714
Liu, Libing,Lu, Sen,Demissie, Hailu,et al. Formation of Al-30 aggregates and its correlation to the coagulation effect[J]. CHEMOSPHERE,2021,278:-.
APA Liu, Libing.,Lu, Sen.,Demissie, Hailu.,Yue, Ye.,Jiao, Ruyuan.,...&Wang, Dongsheng.(2021).Formation of Al-30 aggregates and its correlation to the coagulation effect.CHEMOSPHERE,278,-.
MLA Liu, Libing,et al."Formation of Al-30 aggregates and its correlation to the coagulation effect".CHEMOSPHERE 278(2021):-.
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