DOI: 10.1016/j.watres.2018.02.018
Scopus记录号: 2-s2.0-85042188411
论文题名: A mechanistic study of stable dispersion of titanium oxide nanoparticles by humic acid
作者: Chen Y. ; Gao Q. ; Chen W. ; Wu F. ; Yang Y. ; Werner D. ; Tao S. ; Wang X.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 135 起始页码: 85
结束页码: 94
语种: 英语
英文关键词: Crystalline structure
; Humic acid
; Mechanism
; Stable dispersion
; Titanium oxide nanoparticles
Scopus关键词: Biological materials
; Crystalline materials
; Electrostatics
; Hydrophobicity
; Mechanisms
; Nanoparticles
; Organic acids
; Oxide minerals
; Sonication
; Titanium dioxide
; Titanium oxides
; Water pollution
; Water pollution control
; Crystalline structure
; Dissolved organic matters
; Electrostatic repulsion
; Environmental remediation
; Humic acid
; Hydrophobic interactions
; Stable dispersions
; Titanium oxide nano-particles
; Dispersions
; dissolved organic matter
; humic acid
; titanium dioxide
; titanium dioxide nanoparticle
; nanoparticle
; titanium
; Article
; concentration (parameters)
; crystal structure
; dispersion
; hydrodynamics
; hydrophobicity
; kinetics
; molecular interaction
; molecular stability
; particle size
; pH
; priority journal
; scanning electron microscopy
; stereospecificity
; ultrasound
; water pollution control
; zeta potential
; chemistry
; humic substance
; static electricity
; Humic Substances
; Hydrogen-Ion Concentration
; Nanoparticles
; Sonication
; Static Electricity
; Titanium
英文摘要: Stable dispersion of nanoparticles with environmentally-friendly materials is important for their various applications including environmental remediation. In this study, we systematically examined the mechanisms of stable dispersion of two types of TiO2 nanoparticles (TNPs) with anatase and rutile crystalline structures by naturally occurring dissolved organic matter (humic acid) at different pHs, including at, below and above the Point of Zero Charge (PZC). The results showed that stable dispersion of TNPs by humic acid (HA) at all pHs tested can only be achieved with the assistance of ultra-sonication. The dispersion of TNPs by HA differed at the three pHs tested. Generally, HA greatly decreased the hydrodynamic diameters of TNPs at a very low concentration. The dispersion of TNPs became relatively stable when the HA concentration exceeded 5 mg/L, indicating that this HA concentration is required for stable dispersion of TNPs. The mechanisms involved in dispersion of TNPs by HA included electrostatic repulsion, steric hindrance and hydrophobic interaction. Electrostatic repulsion was identified to be the dominant mechanism. The dispersion of TNPs was enhanced when HA was added before ultra-sonication to avoid the partly irreversible re-aggregation of TNPs after sonication. The crystalline phases and concentrations of TNPs were also found to influence their stable dispersion. The findings from this work enhance understanding of the combined effects of HA, pH, ultra-sonication and crystalline structures of TNPs on their stable dispersion. The mechanisms identified can improve applications of TNPs in environmental water pollution control. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112878
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China; Department of Civil and Environmental Engineering, University of Nevada, Reno, NV 89557, United States; School of Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
Chen Y.,Gao Q.,Chen W.,et al. A mechanistic study of stable dispersion of titanium oxide nanoparticles by humic acid[J]. Water Research,2018-01-01,135