DOI: 10.1016/j.watres.2018.10.094
Scopus记录号: 2-s2.0-85056604788
论文题名: Formation and stability of NOM-Mn(III) colloids in aquatic environments
作者: Li Q. ; Xie L. ; Jiang Y. ; Fortner J.D. ; Yu K. ; Liao P. ; Liu C.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 190
结束页码: 201
语种: 英语
英文关键词: C/Mn ratios
; Colloid formation
; Colloid stability
; HA types
; NOM-Mn(III) colloids
Scopus关键词: Agglomeration
; Biogeochemistry
; Biological materials
; Chemical stability
; Groundwater
; Manganese removal (water treatment)
; Soils
; Sols
; Trace elements
; Biogeochemical cycling
; Biogeochemical process
; Chemical and physical properties
; Colloid formation
; Colloid stability
; Critical coagulation concentration (ccc)
; HA types
; Natural organic matters
; Manganese compounds
; carbon
; humic acid
; manganese
; aggregation
; aquatic environment
; biogeochemical cycle
; coagulation
; colloid
; concentration (composition)
; groundwater-seawater interaction
; manganese
; organic matter
; physicochemical property
; river water
; trace metal
; aquatic environment
; Article
; colloid
; concentration (parameters)
; controlled study
; hydration
; molecular interaction
; physical chemistry
; priority journal
; static electricity
; stereospecificity
; zeta potential
英文摘要: Soluble Mn(III) species stabilized by natural organic matter (NOM) plays a crucial role in a number of biogeochemical processes. To date, current understanding of these phenomena has been primarily concerned on the occurrence and chemistry of soluble NOM-Mn(III) complexes; much less is known regarding the formation and stability of NOM-Mn(III) colloids in the environment. This presents a critical knowledge gap with regard to biogeochemical cycling of manganese and associated carbon, and for predicting the fate and transport of colloid-associated contaminants, nutrients, and trace metals. In this work, we have characterized the chemical and physical properties of humic acid based (HA)-Mn(III) colloids formed over a range of environmentally relevant conditions and quantified their subsequent aggregation and stability behaviors. Results show that molar C/Mn ratios and HA types (Aldrich HA (AHA) and Pahokee peat soil HA (PPSHA)) are critical factors influencing HA-Mn(III) colloidal properties. Both the amount and the stability of HA-Mn(III) colloids increased with increasing initial molar C/Mn ratios, regardless of HA type. The correlation between the critical coagulation concentration (CCC) and zeta potential (R 2 > 0.97) suggests that both Derjaguin-Landau-Verwey-Overbeek (DLVO) type and non-DLVO interactions are responsible for enhanced stability of HA-Mn(III) colloids. For a given C/Mn ratio, PPSHA-Mn(III) colloids are significantly more stable against aggregation than AHA-Mn(III) colloids, which is likely due to stronger electrostatic interactions, hydration interactions, and steric hindrance. Further examination in real-world waters indicates that the HA-Mn(III) colloids are highly stable in surface river water, but become unstable (i.e. extensive aggregation) in solutions representing a groundwater-seawater interaction zone. Overall, this study provides new insights into the formation and stability of NOM-Mn(III) colloids which are critical for understanding Mn-based colloidal behavior(s), and thus Mn cycling processes, in aquatic systems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122157
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, 1088 Xueyuan Road, Shenzhen, 518055, China; Department of Physics, Southern University of Science and Technology, 1088 Xueyuan Road, Shenzhen, 518055, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, United States
Recommended Citation:
Li Q.,Xie L.,Jiang Y.,et al. Formation and stability of NOM-Mn(III) colloids in aquatic environments[J]. Water Research,2019-01-01