菌粉、生物质复合改良紫色土对Cr(Ⅵ)吸附的影响  

Adsorption Effect of Cr(Ⅵ)by Purple Soil Amended with Bacterial Powder and Biomass

作　　者：王尹菲 李敏 李文斌 贾玉婷 刘漫琦 宋雨瑶 WANG Yinfei;LI Min;LI Wenbin;JIA Yuting;LIU Manqi;SONG Yuyao(College of Environmental Science and Engineering,China West Normal University,Nanchong 637009,China;Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610000,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637000 [2]中国科学院成都生物研究所,四川成都610000

出　　处：《环境科学与技术》2022年第10期44-50,共7页Environmental Science & Technology

基　　金：四川省教育厅项目(18ZB0576);国家自然科学基金项目(41271244);西华师范大学科研业务费项目(18B023)。

摘　　要：为了提升紫色土对Cr(Ⅵ)的吸附固定效果,该文采用10%(质量比)的生物质和酵母菌粉对碱性、中性和弱酸性紫色土进行改良,批处理法研究各改良土样对Cr(Ⅵ)的等温吸附特征,并对比不同温度、pH值和离子浓度下的吸附差异。结果表明,不同改良紫色土对Cr(Ⅵ)的吸附均适合Langmuir模型描述。Cr(Ⅵ)的最大吸附量(q_(m))保持在99.66~283.63 mg/kg之间,q_(m)表现为菌粉改良>菌粉和生物质复合改良>生物质改良>未改良。相同改良条件下,q_(m)随土壤pH的升高而降低。随着pH值的升高,各改良紫色土对Cr(Ⅵ)的吸附量均呈现下降的趋势,pH=2时最佳。供试改良紫色土对Cr(Ⅵ)的吸附量均随着离子强度的增加先增大后减小,以0.05 mol/L最佳。温度升高有利于各改良紫色土对Cr(Ⅵ)的吸附。热力学参数表明各改良紫色土对Cr(Ⅵ)吸附均为自发、吸热和熵增过程。In order to improve the adsorption and fixation effect of Cr(Ⅵ)on purple soil,biomass and bacterial powder(10%in mass ratio)were used to amend alkaline,neutral and weakly acidic purple soil.The isothermal adsorption characteristics of Cr(Ⅵ)on different amended soil samples were investigated by batch method,and the adsorption difference of Cr(Ⅵ)at various temperature,pH value and ionic strength were compared.The results showed that Langmuir model was suitable for describing the isothermal adsorption of Cr(Ⅵ)on different tested soil samples.The maximum adsorption capacity(q_(m))of Cr(Ⅵ)on the amended soil samples was maintained between 99.66 and 283.63 mg/kg,and ranked in the order of bacterial powder amended>bacterial powder and biomass amended>biomass amended>unamended.q_(m)decreased with the increase of soil acidity under the same amelioration condition.The adsorption capacity of Cr(Ⅵ)decreased with the increase of pH in the pH range of 2~8,and reached the optimum value at pH 2.The adsorption capacity of Cr(Ⅵ)increased and then decreased with the increase of ionic strength,and 0.05 mol/L was the best.High temperature was favorable for Cr(Ⅵ)adsorption on different amended purple soils.Thermodynamic parameters showed that Cr(Ⅵ)adsorption was a spontaneous,exothermic and entropy-adding reaction process.

关 键 词：土壤改良 Cr(Ⅵ) 紫色土 吸附量 热力学 

分 类 号：X53[环境科学与工程—环境工程]