DOI: 10.1016/j.watres.2017.11.034
Scopus记录号: 2-s2.0-85034597190
论文题名: Mechanistic insights into alginate fouling caused by calcium ions based on terahertz time-domain spectra analyses and DFT calculations
作者: Zhang M. ; Hong H. ; Lin H. ; Shen L. ; Yu H. ; Ma G. ; Chen J. ; Liao B.-Q.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 129 起始页码: 337
结束页码: 346
语种: 英语
英文关键词: Calcium ion
; DFT calculation
; Membrane bioreactor
; Membrane fouling
; Wastewater treatment
Scopus关键词: Alginate
; Bioreactors
; Calcium
; Chains
; Density functional theory
; Filtration
; Fourier transform infrared spectroscopy
; Ions
; Laser pulses
; Membrane fouling
; Photoelectricity
; Suspensions (fluids)
; Terahertz spectroscopy
; Thermodynamic stability
; Thermogravimetric analysis
; Wastewater treatment
; Calcium ions
; DFT calculation
; Membrane bioreactor
; Specific filtration resistance
; Structural variations
; Terahertz time domain spectroscopy
; Tetrahedron structures
; X-ray photoelectric spectroscopy
; Time domain analysis
; alginic acid
; calcium ion
; alginic acid
; calcium
; glucuronic acid
; hexuronic acid
; alginate
; bioreactor
; calcium
; cation
; filtration
; fouling
; membrane
; methodology
; polymer
; sludge
; spectral analysis
; wastewater treatment
; Article
; atom
; biofouling
; concentration (parameters)
; density functional theory
; filtration
; infrared spectroscopy
; priority journal
; terahertz spectroscopy
; thermogravimetry
; thermostability
; artificial membrane
; chemistry
; procedures
; sewage
; spectroscopy
; Alginates
; Calcium
; Filtration
; Glucuronic Acid
; Hexuronic Acids
; Membranes, Artificial
; Spectrum Analysis
; Waste Disposal, Fluid
英文摘要: Fouling mechanisms underlying the filtration behaviors of alginate solution caused by calcium addition were investigated by Terahertz time-domain spectroscopy (THz-TDS) and density functional theory (DFT) techniques. Filtration tests showed that specific filtration resistance (SFR) of alginate solution (0.75 g L−1) monotonously increased with calcium addition at a relatively low range of calcium concentration (0–1.0 mM), and SFR (2.61 × 1015 m kg−1) of alginate solution with 1.0 mM calcium addition was extremely high as compared with sludge suspension. Characterizations by X-ray photoelectric spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric analysis (TGA) showed that the composition of functional groups, elements and thermal stability of alginate was not apparently affected by calcium concentration. Howbeit, THz-TDS spectra showed that calcium addition caused structural variation of alginate polymer in solution. DTF calculation results showed that initial binding of alginate chains induced by calcium ions preferentially occurred in intermolecular other than intramolecular, and moreover, the two alginate chains bridged by a calcium atom tend to stretch in a tetrahedron structure (cross to each other) other than parallel to each other. According to these results, “chemical potential gap” depicted by Flory-Huggins theory was suggested to be responsible for the filtration behaviors of alginate solution caused by calcium addition. This study provided the mechanistic insights into membrane fouling. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113107
Appears in Collections: 气候减缓与适应
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作者单位: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
Recommended Citation:
Zhang M.,Hong H.,Lin H.,et al. Mechanistic insights into alginate fouling caused by calcium ions based on terahertz time-domain spectra analyses and DFT calculations[J]. Water Research,2018-01-01,129