不同结构铝氧化物对磷的吸附特征  

Phosphorus Sorption Characteristics on Aluminum Oxides with Different Structures

作　　者：李敬[1,2] 刘晓月 邱千峰 李苓 曹晓燕[1,2,3] LI Jing;LIU Xiaoyue;QIU Qianfeng;LI Ling;CAO Xiaoyan(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education/Institute for Advanced Ocean Study,Ocean University of China,Qingdao 266100,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室/海洋高等研究院,青岛266100 [2]中国海洋大学化学化工学院,青岛266100 [3]中国海洋大学青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室,青岛266100

出　　处：《无机材料学报》2020年第9期1005-1010,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(41676064);国家重点研发计划项目(2016YFA0601301)。

摘　　要：磷是影响藻类生长的重要营养元素,它在沉积物界面上的吸附是海洋环境中磷循环的重要环节,金属氧化物是吸附磷沉积物的重要活性组分之一。采用批量实验法研究不同结构的氧化铝对无机磷的吸附特征,分别使用二段一级动力学方程和Freundlich等方程对其动力学曲线和平衡吸附等温线进行定量描述,并对介质盐度、温度等影响因素进行研究。结果发现,无定型氧化铝结晶弱且比表面积大,该特点使其吸附容量大于γ-Al2O3,结合表面酸碱滴定的结果,可知吸附也与铝氧化物的表面酸碱性质相关。分析影响因素可知,与NaNO3介质相比,氧化铝吸附海水中的磷受到阻滞,且随着介质离子强度增大,吸附量均呈现降低趋势;pH显著影响磷的吸附量,在pH=5左右,两种氧化铝表面对磷酸根的吸附达到最大值;温度升高,有利于吸附的进行,该吸附为吸热、自发、熵增加的过程,两种结构氧化铝的吸附热力学参数无显著差异。Phosphorus is an important nutrient element that affects the growth of algae.The sorption of phosphorus on the sediments plays an important role in its bio-geochemical cycle,with metal oxides such as alumina being one of the important active components for the process.The sorption behavior of phosphorus on two kinds of alumina(γ-Al2O3,amorphous alumina)was studied through batch methods.Both kinetics and thermodynamics of the process were investigated,as well as the effects of temperature,salinity,and pH of the medium on the process.The sorption kinetic curves could be described by a two-compartment first order equation,and the isotherms fit Freundlich equation well.The amorphous alumina has a larger specific surface area,and its sorption ability is stronger than that ofγ-Al2O3.Based on the results of surface acid-base titration,the sorption behavior is also considered to be related to the surface acidity and alkalinity of the aluminum oxides.Compared with NaNO3 medium,the sorption of phosphorus in seawater was weakened.The sorption capacity decreases with the increase of the ionic strength.pH significantly affected the sorption ability of the oxides with the maximum capacity at pH=5.Higher temperatures are favorable to the sorption progress,which is endothermic and spontaneous with entropy increasing.The difference in the thermodynamic parameters of the two alumina seemed unremarkable.

关 键 词：富营养化 磷 铝氧化物 结构 吸附 

分 类 号：X703[环境科学与工程—环境工程]