|
| Co-sorption of natural organic matter and metal ions on minerals |
| Received:March 07, 2018 |
| View Full Text View/Add Comment Download reader |
| KeyWord:natural organic matter;fulvic acid;humic acid;metal ions;minerals;co-adsorption |
| Author Name | Affiliation | E-mail | | YI Ceng | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | YAN Yu-peng | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | ypyan@mail.hzau.edu.cn | | WANG Xiao-ming | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Zhen | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | XIONG Juan | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | LIU Fan | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | FENG Xiong-han | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | TAN Wen-feng | Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | |
|
| Hits: 2926 |
| Download times: 3387 |
| Abstract: |
| Natural organic matter(NOM)is ubiquitous in soils, sediments, and water. Fulvic acid(FA)and humic acid(HA), which are predominant NOM species, are highly reactive and can readily interact with natural mineral particles and metal ions. These reactions can affect the surface chemical properties of minerals as well as the speciation and mobility of metal ions, thereby controlling the bioavailability and toxicity of metals in the environment. This review discusses the co-adsorption characteristics and major factors influencing the interaction of NOM(such as FA and HA)with metal ions on mineral surfaces in the ternary complex. Progress on research on spectroscopic and surface complexation modeling methods used to study the ternary systems and related reaction mechanisms are summarized. The role of NOM in changing the adsorption characteristics and reaction mechanisms of metal ions on a mineral surface is affected by many factors; major ones include pH, types and concentrations of metal ions and NOM, the order in which NOM and metal ions are added, and type of mineral. The presence of NOM generally leads to the increased sorption of metal ions on minerals at low pH. Possible mechanisms include i) NOM and metal ion competition for the reactive sites on mineral surfaces; ii)formation of metal ion-NOM complexes; iii)formation of type A ternary surface complexes(in which cations form bridges between mineral surfaces and NOM)or type B ternary surface complexes(in which cations are associated with the ligands on NOM that are not involved in complexation with mineral surfaces); and iv)electrostatic interactions that change the charge of the surface. Finally, gaps and future efforts needed on research on the co-sorption of ligands, such as NOM, with metal ions on mineral surfaces are discussed. |
|
|
|
