氨基酸类有机质在土壤矿物上的吸附机理  

Mechanism of Adsorption of Organic Matter Amino-acids on Soil Minerals

作　　者：黄凤琼 张迪 李芳芳[1] 孙晓 石林 HUANG Fengqiong;ZHANG Di;LI Fangfang;SUN Xiao;SHI Lin(Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control,Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;Shandong Provincial Key Lab of Water and Soil Conservation and Environmental Protection,College of Resources and Environment,Linyi University,Linyi 276005,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南省土壤固碳与污染控制重点实验室,云南昆明650500 [2]临沂大学资源环境学院,山东省水土保持与环境保育重点实验室,山东临沂276005

出　　处：《环境科学与技术》2024年第3期171-178,共8页Environmental Science & Technology

基　　金：国家自然科学基金(42167030);山东省泰山学者青年专家项目(tsqn202306276);临沂大学高层次人才(博士)科研启动基金(Z6122037,Z6122025)。

摘　　要：氨基酸类有机质在土壤矿物中的吸附行为影响着土壤碳氮循环,因此研究土壤矿物对此类有机质的吸附机理具有重要的环境意义和科学意义。该文研究了3种典型土壤矿物对5种不同分子量的氨基酸类有机质的吸附行为,结合FTIR和XRD表征和竞争实验探究了土壤矿物对此类有机质的吸附机理。结果表明,色氨酸和苯丙氨酸在蒙脱土、高岭石和赤铁矿上均无吸附;酪氨酸和胸腺五肽在高岭石和赤铁矿上的吸附量相近且较低,两者在蒙脱土上吸附量分别可达30 mg/g和38 mg/g;牛血清蛋白在矿物上的吸附量顺序为赤铁矿>高岭石≈蒙脱土。氨基酸类有机质在赤铁矿和高岭石上均呈现分子量越大、吸附量越大的趋势,在蒙脱土上吸附量呈现短肽>氨基酸>蛋白质的规律。As the behavior of adsorption of organic matter amino-acids on soil minerals would affect the carbon/nitrogen cycle,the study on the mechanism of adsorption of the organic matter by soil minerals is of environmental and scientific signif⁃icance.The adsorption behavior of five amino acids with different molecular weights on three typical soil minerals was investi⁃gated.FIRT and XRD characterization,as well as the comparative experiments,were used to explore the adsorption mecha⁃nism.Results of the study showed none of the adsorption of tryptophan and phenylalanine onto montmorillonite,kaolinite and hematite;on the other hand,tyrosine and thymus pentapeptide were similarly adsorbed on kaolinite and hematite at lower amounts,and both of them could be adsorbed on montmorillonite up to 30 mg/g and 38 mg/g,respectively.Adsorption of bovine serum albumin on minerals was in the order of decreasing magnitude as hematite>kaolinite≈montmorillonite.Adsorp⁃tion of amino acids on both hematite and kaolinite showed a trend:the greater molecular weight,the higher the adsorption capacity;and the regularity of adsorption of organic matters on montmorillonite showed an order of decreasing magnitude as oligopeptide>amino-acid>protein.

关 键 词：吸附机制 矿物 蛋白质 多肽 氨基酸 

分 类 号：X53[环境科学与工程—环境工程]