磷石膏对黄壤镁吸附解吸特性的影响  

Effect of Phosphogypsum on Adsorption and Desorption Characteristics of Magnesium in Loess Soil

作　　者：胡昌荣 易芸[1,2] 曹建新 田娟[3] 陈文兴 HU Chang-rong;YI Yun;CAO Jian-xin;TIAN Juan;CHEN Wen-xing(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China;Guizhou Key Laboratory for Green Chemical and Clean Energy Technology,Guiyang 550025,China;Guizhou Research Institute of Chemical Industry,Guiyang 550002,China)

机构地区：[1]贵州大学化学与化工学院,贵阳550025 [2]贵州省绿色化工与清洁能源技术重点实验室,贵阳550025 [3]贵州省化工研究院,贵阳550002

出　　处：《科学技术与工程》2023年第30期12842-12849,共8页Science Technology and Engineering

基　　金：国家重点研发计划(2018YFC1900206-2);贵州省科技计划(黔科合平台人才[2019]5409,黔科合服企[2018]4011)。

摘　　要：土壤的镁素吸附解吸行为与生态、农作物间的平衡发展密切相关,对维持土壤正常的生态效应具有重要意义。磷石膏用作土壤改良剂可改变土壤的理化性质,进而影响土壤镁的吸附解吸行为。以磷石膏和黄壤为原料,研究磷石膏掺量对黄壤镁吸附解吸特性的影响。结果表明:磷石膏基本不影响黄壤的镁吸附行为,适量磷石膏可促进黄壤对镁的吸附作用,培养时间对磷石膏促进或抑制黄壤镁吸附能力作用的影响不显著;原土和混合土样的镁等温吸附过程均符合Langmuir等温吸附方程,磷石膏几乎不影响其对镁的吸附热力学特性;原土和混合土样的镁吸附动力学过程满足准二级动力学方程,磷石膏没有改变黄壤对镁的吸附动力学行为;适量磷石膏可促进黄壤对镁的解吸作用,掺量过多促进解吸的作用会减弱,甚至可能抑制黄壤对镁的解吸作用。The adsorption and desorption behavior of magnesium in soil is closely related to the balanced development of ecology and crops,and is of great significance for maintaining the normal ecological effects of soil.Phosphogypsum as a soil conditioner can change the physical and chemical properties of soil,and thus affect the adsorption and desorption behavior of magnesium in soil.Phosphogypsum and loess soil were used as raw materials to study the effect of phosphogypsum content on magnesium adsorption and desorption characteristics of loess soil.The results show that phosphogypsum have no effect on the adsorption of magnesium in loess soil,and proper amount of phosphogypsum can promote the adsorption of magnesium in loess soil,while the effect of incubation time on the adsorption of magnesium in loess soil is not significant.The magnesium isotherm adsorption process of raw soil and mixed soil samples conforms to Langmuir isothermal adsorption equation,and phosphogypsum hardly affects its adsorption thermodynamic characteristics of magnesium.The magnesium adsorption kinetics of the original soil and mixed soil samples meets the pseudo-second-order kinetics equation,and phosphogypsum do not change the adsorption kinetics of magnesium in loess soil.An appropriate amount of phosphogypsum can promote the desorption of magnesium in loess soil,but the effect of too much phosphogypsum on the desorption of magnesium in loess soil will be weakened,and may even inhibit the desorption of magnesium in loess soil.

关 键 词：磷石膏 黄壤 镁 吸附 解吸 

分 类 号：S156.6[农业科学—土壤学]