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Effect of soil fulvic and humic acid on binding of Pb to goethite-water interface: Linear additivity and volume fractions of HS in the Stern layer
Xiong, Juan1; Koopal, Luuk K.1,2; Weng, Liping1,3; Wang, Mingxia1; Tan, Wenfeng1,4
2015-11-01
Source PublicationJOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume457Pages:121-130
AbstractThe effects of soil fulvic (JGFA) and humic acid (JGHA) on Pb binding to goethite were investigated with batch experiments and modeling. The CD-MUSIC and NICA-Donnan model could describe the Pb binding to, respectively, the binary Pb-goethite and Pb-HS systems. The adsorption of humic substances (HS) on goethite strongly depended on pH and was promoted by Pb binding. The mass amount of adsorbed JGFA (mg/g) was smaller than that of JGHA, but when expressed in number of particles/nm(2) the JGFA adsorption was higher. At low pH and low initial Pb concentration the linear additivity rule always underestimated Pb adsorption to goethite-HS complex, which was caused by the strong effect of adsorbed HS on the electrostatic potentials in the Stern layer region. At other conditions except the 450 mg/L JGHA in the 0.5 mmol/L Pb system the additivity rule predicted the experimental results reasonably well, and at high pH nearly all Pb is bound to goethite. At the same mass adsorbed, the effect of JGFA on Pb adsorption to goethite is stronger than that of JGHA, due to the fact that the JGFA particles were primarily adsorbed in the Stern layer, whereas JGHA particles were present in both Stern layer and diffuse layer. Therefore, the electrostatic potential profile of the goethite-JGFA complex is considerably different from that of goethite-JGHA complex and affects Pb binding strongly. (C) 2015 Elsevier Inc. All rights reserved.
SubtypeArticle
KeywordHumic Substance Humic Acid Fulvic Acid Iron Oxide Goethite Pb Binding Model Particle Size Volume Fractions
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedChemistry
WOS KeywordINTRINSIC PROTON AFFINITY ; REACTIVE SURFACE GROUPS ; NATURAL ORGANIC-MATTER ; ION-BINDING ; CHARGE-DISTRIBUTION ; METAL (HYDR)OXIDES ; PB(II) SORPTION ; LEAD BINDING ; IRON-OXIDES ; ADSORPTION
Indexed BySCI
Language英语
WOS SubjectChemistry, Physical
WOS IDWOS:000359450000015
PublisherACADEMIC PRESS INC ELSEVIER SCIENCE
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/67876
Collection中国科学院地理科学与资源研究所
Corresponding AuthorTan, Wenfeng
Affiliation1.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
2.Wageningen Univ, Phys Chem & Soft Matter, NL-6703 HB Wageningen, Netherlands
3.Wageningen Univ, Dept Soil Qual, NL-6700 EC Wageningen, Netherlands
4.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shanxi, Peoples R China
Recommended Citation
GB/T 7714
Xiong, Juan,Koopal, Luuk K.,Weng, Liping,et al. Effect of soil fulvic and humic acid on binding of Pb to goethite-water interface: Linear additivity and volume fractions of HS in the Stern layer[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2015,457:121-130.
APA Xiong, Juan,Koopal, Luuk K.,Weng, Liping,Wang, Mingxia,&Tan, Wenfeng.(2015).Effect of soil fulvic and humic acid on binding of Pb to goethite-water interface: Linear additivity and volume fractions of HS in the Stern layer.JOURNAL OF COLLOID AND INTERFACE SCIENCE,457,121-130.
MLA Xiong, Juan,et al."Effect of soil fulvic and humic acid on binding of Pb to goethite-water interface: Linear additivity and volume fractions of HS in the Stern layer".JOURNAL OF COLLOID AND INTERFACE SCIENCE 457(2015):121-130.
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