一年蓬凋落物浸提液对紫色土吸附Cu(Ⅱ)的影响  

Effects of Litter Extracts from Erigeron annuus on Cu(Ⅱ)Adsorption by Purple Soils

作　　者：李文斌 芦子珊 王尹菲 杨燕 喻楚桐 吴金倪 李艳华 罗琳 魏琳洁 李茹怡 LI Wen-bin;LU Zi-shan;WANG Yin-fei;YANG Yan;YU Chu-tong;WU Jin-ni;LI Yan-hua;LUO Lin;WEI Lin-jie;LI Ru-yi(College of Environmental Science and Engineering,China West Normal University,Nanchong Sichuan 637009,China)

机构地区：[1]西华师范大学环境科学与工程学院,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2023年第4期342-349,共8页Journal of China West Normal University(Natural Sciences)

基　　金：国家自然科学基金项目(41271244);四川省科技厅项目(2018JY0224);西华师范大学科研业务费项目(18B023)。

摘　　要：为了探究入侵植物一年蓬(Erigeron annuus)凋落物浸提液(Le)对不同类型紫色土吸附Cu(Ⅱ)的影响,以一年蓬地上部(U)和地下部(D)Le对酸性、中性和碱性紫色土进行修饰,批处理法研究各Le修饰紫色土对Cu(Ⅱ)的等温吸附特征,并对比温度、pH和离子强度对Cu(Ⅱ)吸附的影响。结果显示:(1)各Le修饰紫色土对Cu(Ⅱ)的最大吸附量在122.1~399.0 mmol·kg^(-1)。相比酸性和碱性紫色土,Le修饰中性紫色土对Cu(Ⅱ)的吸附效果最好。DLe修饰紫色土对Cu(Ⅱ)的吸附效果比ULe修饰紫色土更好,且20%Ule和50%DLe时Cu(Ⅱ)吸附效果最佳。(2)pH和温度升高均有利于Le修饰紫色土对Cu(Ⅱ)的吸附。各Le修饰紫色土对Cu(Ⅱ)的吸附量随离子强度的增加先增加后减小,0.1 mol·L^(-1)时达到最佳。(3)Le修饰紫色土吸附Cu(Ⅱ)是一个自发、吸热和熵增的反应过程。当pH=6、离子强度0.1 mol·L^(-1)和20℃时,Le修饰紫色土对Cu(Ⅱ)的吸附量达到最大值。The overground(U)and underground(D)Le from Erigeron Annuus are employed to modify acid,neutral and alkaline purple soils in order to explore the effects of litter extracts(Le)from invasive plant(Erigeron annuus)on Cu(Ⅱ)adsorption by different types of purple soils.The isothermal adsorption characteristics of Cu(Ⅱ)by different Le-modifed purple soils are investigated by batch processing method,and the effects of temperature,pH and ionic strength on Cu(Ⅱ)adsorption are analyzed.The results are as follows:(1)The maximum adsorption capacity of Cu(Ⅱ)by different Le-modifed purple soils is between 122.1 and 399.0 mmol·kg^(-1);the adsorption effect of Le-modified neutral purple soil is better than that of Le-modified acid and alkaline purple soils;the adsorption effect of Cu(Ⅱ)by DLe-modified purple soil is better than that of ULe-modified purple soil,and the adsorption effect of Cu(Ⅱ)is the best at 20%ULe and 50%DLe;(2)The increase of pH and temperature are favorable for Cu(Ⅱ)adsorption by different Le-modified purple soils;the adsorption amount of Cu(Ⅱ)by Le-modified purple soils has increased first and then decreased as the iconic strength enhanced,reaching the best value when the ionic strength is 0.1 mol·L-1;(3)The adsorption of Cu(Ⅱ)by Le-modified purple soils is a spontaneous,endothermic and entropic-incresing reaction;when pH=6,ionic strength is 0.1 mol·L-1 and the temperature is 20℃,the adsorption amount of Cu(Ⅱ)by Le-modified purple soils will reach the maximum.

关 键 词：一年蓬 入侵植物 凋落物浸提液 紫色土 Cu(Ⅱ) 吸附量 

分 类 号：X53[环境科学与工程—环境工程]