DOI: 10.1016/j.watres.2017.12.081
Scopus记录号: 2-s2.0-85040639567
论文题名: Advantages of titanium xerogel over titanium tetrachloride and polytitanium tetrachloride in coagulation: A mechanism analysis
作者: Wang X. ; Gan Y. ; Guo S. ; Ma X. ; Xu M. ; Zhang S.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 132 起始页码: 350
结束页码: 360
语种: 英语
英文关键词: Acetylacetone
; Mechanism
; Organic matter
; Titanium-based coagulants
; Turbidity
Scopus关键词: Acetone
; Binding energy
; Biogeochemistry
; Biological materials
; Chlorine compounds
; Complexation
; Gelation
; Hydrolysis
; Mechanisms
; Organic compounds
; Titanium
; Turbidity
; Xerogels
; Acetylacetone
; Coagulation performance
; Complexation reaction
; Hydrolysis behavior
; Mechanism analysis
; Physicochemical property
; Titanium tetrachlorides
; Titanium-based
; Coagulation
; acetylacetone
; organic matter
; polytitanium tetrachloride
; titanium
; titanium tetrachloride
; unclassified drug
; chemical reaction
; coagulation
; concentration (composition)
; hydrolysis
; inorganic compound
; organic matter
; physicochemical property
; pollutant removal
; polymer
; polymerization
; titanium
; turbidity
; Article
; binding affinity
; complex formation
; density
; flocculation
; gelation
; hydrolysis
; isoelectric point
; physical chemistry
; polymerization
; priority journal
; structure analysis
; surface charge
; surface property
; turbidity
; water treatment
; xerogel
英文摘要: Titanium xerogel coagulant (TXC) worked better than titanium tetrachloride (TC) and polytitanium chloride (PTC) in a wider pH/dose range for the removal of turbidity. However, the underlying mechanisms were not comprehensively understood. In this work, the better coagulation performance of TXC than TC and PTC was systematically elucidated from the following aspects: the physicochemical properties of the three coagulants, the removal of turbidity and organic matter, and the complexation reactions in coagulation. The results demonstrate that the merits of TXC were attributable to the following characteristics: (1) the higher surface charge density/total surface site concentration/isoelectric point of TXC hydrolysates, (2) the formation of TXC hydrolysates with a net-work structure, and (3) the strong binding affinity of TXC hydrolysates to organic matter caused by the bonded acetylacetone in the TXC framework. In short, the hydrolysis behavior of TXC significantly differed from both its precursor, TC, and the prehydrolyzed PTC. The difference in the hydrolysis of TXC was derived from the gelation process, which led to the polymerization of Ti in a way different from prehydrolyzation. The elucidation of the hydrolysis mechanisms is useful for the better application of Ti-based coagulants and may shed light on the preparation of other metal salts. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112964
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University210023, China
Recommended Citation:
Wang X.,Gan Y.,Guo S.,et al. Advantages of titanium xerogel over titanium tetrachloride and polytitanium tetrachloride in coagulation: A mechanism analysis[J]. Water Research,2018-01-01,132