Selective adsorption of soil humic acid on binary systems containing kaolinite and goethite: Assessment of sorbent interactions
文献类型：期刊论文
| 作者 | Chen, Hongfeng1; Koopal, Luuk K.1; Xu, Jinling2; Wang, Mingxia1; Tan, Wenfeng1 |
| 刊名 | EUROPEAN JOURNAL OF SOIL SCIENCE
 |
| 出版日期 | 2019-09-01 |
| 卷号 | 70期号:5页码:1098-1107 |
| 关键词 | binary systems of kaolinite and goethite electrostatic attraction hydrophobic effect ligand exchange molar mass selective adsorption soil humic acid |
| ISSN号 | 1351-0754 |
| DOI | 10.1111/ejss.12803 |
| 通讯作者 | Tan, Wenfeng(tanwf@mail.hzau.edu.cn) |
| 英文摘要 | Inorganic 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 |
| WOS关键词 | ORGANIC-MATTER ; FULVIC-ACID ; SORPTION ; MECHANISMS ; ASSOCIATIONS ; SUBSTANCES ; STABILITY ; HEMATITE ; PH |
| 资助项目 | National 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] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:000483693100014 |
| 出版者 | WILEY |
| 资助机构 | National Natural Science Foundation of China ; National Key Basic Research Program of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/69609]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Tan, Wenfeng |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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