设为首页  |   加入收藏
引用本文:
【打印本页】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
过刊浏览    高级检索
本文已被:浏览 35次   下载 0  
分享到: 微信 更多
磷酸根在矿物表面的吸附-解吸特性研究进展
严玉鹏1, 王小明1, 胡震1, 王慧2, 殷辉1, 刘凡1, 冯雄汉1
1.华中农业大学;2.安徽省农业科学院土壤肥料研究所
摘要:
磷是植物生长必需的营养元素,也是关联生态系统中生物与非生物作用的关键元素。磷酸根在矿物表面的吸附、解吸和沉淀等界面反应影响和决定其在陆地和水环境中的形态、迁移、转化和生物有效性。本文综述了磷酸根在一些常见土壤矿物表面吸附-解吸特性的研究进展。磷酸根在矿物表面的吸附特性受环境pH、离子强度、温度、反应时间、矿物类型等多种因素共同的影响。一般说来,矿物表面的磷吸附量随pH降低而增加,受离子强度的影响较小。磷酸根在矿物表面的吸附动力学过程可分为快速吸附和慢速吸附过程,且在弱结晶矿物中存在微孔扩散过程。磷酸根在矿物表面的解吸过程通常存在两个阶段(初始快速解吸和随后的缓慢解吸),在解吸反应后期甚至还会发生再吸附。此外,磷酸根的吸附特性也受共存阴离子配体或金属阳离子的影响。其中,共存阴离子通过位点竞争、静电作用和空间位阻效应等机制影响磷酸根的吸附。天然有机质(包括胡敏酸和富里酸)降低了磷酸根在矿物表面的吸附,特别是在低pH条件下。通常,富里酸比胡敏酸更能有效降低磷酸根在矿物表面的吸附。金属阳离子可通过表面静电效应、形成三元络合物以及形成表面沉淀等机制促进磷酸根和金属在矿物表面的共吸附。最后,本文展望了与磷酸根在矿物表面吸附特性有关的研究热点和方向。
关键词:  矿物  磷酸根  吸附-解吸  特性  铁氧化物  铝氧化物  粘土矿物  配体  阳离子
DOI:
分类号:S153.3
基金项目:国家重点研发专项(2017YFD0200201)和国家自然科学基金项目(41603100)资助。
Progress in Researches on Sorption and Desorption Characteristics of Phosphate on Minerals
yanyupeng06@163.com,Wang Xiaoming,Hu Zhen,Wang Hui,Yin Hui,Liu Fan,Feng Xionghan
Huazhong Agricultural University
Abstract:
Phosphorus is an essential nutrient for plant growth and a key element in relation to the biological and abiotic effects of ecosystems. The adsorption, desorption and precipitation of phosphate on the surface of minerals affect and determine its speciation, migration, transformation and bioavailability in terrestrial and aquatic environments. The research progress of phosphate sorption and desorption on common soil minerals are reviewed. The sorption characteristics of phosphate on mineral surface are affected by pH, ionic strength, temperature, reaction time, mineral type, and so on. Generally, the amount of phosphate adsorbed on the surface of mineral increases with decreasing pH and is less affected by ionic strength. The sorption kinetics of phosphate on the mineral surface can be divided into rapid sorption and slow sorption processes, and microporous diffusion processes exist on weakly crystalline minerals. Phosphate desorption on mineral surface usually has two stages (initial rapid desorption and subsequent slow desorption), and even re-sorption occurs in the later stage of desorption reaction. In addition, coexistence of anions or metal cations in multiple systems also affects the sorption of phosphate on minerals. Coexisting anions (ligands) affect phosphate sorption through site competition, electrostatic interaction and steric hindrance. The sorption of phosphate on minerals?is decreased by the presence of natural organic matter (e.g., humic acid and fulvic acid), especially at low pH. In general, the effects of the fulvic acid are more effective than humic acid in reducing phosphate sorption on minerals. When metal cations coexist, the sorption of phosphate and metal on the mineral surface could be promoted by surface electrostatic effects, formation of ternary complexes, and formation of surface precipitates. Finally, hot spots are proposed for future researches related to the sorption of phosphate on mineral surfaces.
Key words:  Mineral  Phosphate  Sorption-desorption  Characteristics  Iron oxides  Aluminum oxides  Clay  Ligand  Cation

您是第3365430位访问者
版权所有 © 《土壤》编辑部
本系统由北京勤云科技发展有限公司设计   京ICP备09084417号