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Selective adsorption of soil humic acid on binary systems containing kaolinite and goethite: Assessment of sorbent interactions
Chen, Hongfeng1; Koopal, Luuk K.1; Xu, Jinling2; Wang, Mingxia1; Tan, Wenfeng1
2019-09-01
Source PublicationEUROPEAN JOURNAL OF SOIL SCIENCE
ISSN1351-0754
Volume70Issue:5Pages:1098-1107
Corresponding AuthorTan, Wenfeng(tanwf@mail.hzau.edu.cn)
AbstractInorganic colloids are ubiquitous in soils and coexist as simple mixtures or as strong associations of particles. The coexisting inorganic colloids with a variety of active sites can selectively adsorb humic substances and thus affect the availability and mobility of organic matter. To investigate the selective adsorption of organic matter by coexisting inorganic colloids, humic acid (JGHA) extracted from soil, a kaolinite and goethite synthetic association (KGA) and a kaolinite and goethite mixture (KGM) were prepared and studied. With the adsorption expressed in mu mol m(-2), the adsorption affinity of JGHA on KGA (initial slope of isotherms) was slightly higher than that on KGM, although KGM could adsorb more JGHA molecules at larger JGHA concentrations. At pH 4, JGHA was adsorbed on the kaolinite edges and goethite through electrostatic attraction and ligand exchange, and on the kaolinite siloxane plates through hydrophobic interaction. At pH 6 and 8, the adsorption occurred only on the kaolinite siloxane plates and goethite. The overall average adsorption Gibbs energies were moderately negative, and comprised a strongly negative average overall molar entropy and a negative average overall molar entropy contribution. Thus, overall JGHA adsorption on KGA and KGM was enthalpy controlled. The large exothermic enthalpy gains and entropy losses were a result of electrostatic attraction and ligand exchange. The entropy gains because of hydrophobic attraction between JGHA and the kaolinite siloxane plates are masked by the larger entropy loss of adsorption on the hydrophilic surfaces. The fractions of JGHA with molar mass >similar to 12.9 kDa (1 Da = 1 g mol(-1)) were adsorbed selectively by KGM, whereas the fractions
Keywordbinary systems of kaolinite and goethite electrostatic attraction hydrophobic effect ligand exchange molar mass selective adsorption soil humic acid
DOI10.1111/ejss.12803
WOS KeywordORGANIC-MATTER ; FULVIC-ACID ; SORPTION ; MECHANISMS ; ASSOCIATIONS ; SUBSTANCES ; STABILITY ; HEMATITE ; PH
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41330852] ; National Natural Science Foundation of China[41425006] ; National Natural Science Foundation of China[2015CB150504] ; National Key Basic Research Program of China[2015CB150504]
Funding OrganizationNational Natural Science Foundation of China ; National Key Basic Research Program of China
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000483693100014
PublisherWILEY
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/69610
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, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, Wuhan 430070, Hubei, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Chen, Hongfeng,Koopal, Luuk K.,Xu, Jinling,et al. Selective adsorption of soil humic acid on binary systems containing kaolinite and goethite: Assessment of sorbent interactions[J]. EUROPEAN JOURNAL OF SOIL SCIENCE,2019,70(5):1098-1107.
APA Chen, Hongfeng,Koopal, Luuk K.,Xu, Jinling,Wang, Mingxia,&Tan, Wenfeng.(2019).Selective adsorption of soil humic acid on binary systems containing kaolinite and goethite: Assessment of sorbent interactions.EUROPEAN JOURNAL OF SOIL SCIENCE,70(5),1098-1107.
MLA Chen, Hongfeng,et al."Selective adsorption of soil humic acid on binary systems containing kaolinite and goethite: Assessment of sorbent interactions".EUROPEAN JOURNAL OF SOIL SCIENCE 70.5(2019):1098-1107.
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