水土保持学报2017，Vol.31Issue(5)：345-349,5.DOI:10.13870/j.cnki.stbcxb.2017.05.054
纳米TiO2对土壤Hg2+吸附解吸性能的影响
Effect of Nano-TiO2 on the Adsorption and Desorption of Hg2+ in Soil
摘要
Abstract
To investigate the effects of nano-TiO2 on the adsorption and desorption of Hg2+ in soil of the drawdown area of the Three Gorges Reservoir,nano-TiO2 particles of different crystal structures (anatase and rutile) were selected,and were added to soil to preparade four concentrations (0,2,4,and 8 g/kg) samples.Meanwhile,Hg2+ solutions with different Hg2+ concentrations were preparade to conduct the Hg2+ adsorption and desorption experiments.The results showed that nano-TiO2 particles increased Hg2+ adsorption capacity of soil,but it was affected by the crystal form and concentration of nano-TiO2 particles.The adsorption capacity of anatase particles was stronger than that of rutile particles,and adsorbed Hg2+ was difficult to be desorbed.In anatase particles treatments,when the concentration of nano-TiO2 particles was 4 g/kg,its Hg2+adsorption capacity was the largest,which was 32.65％ higher than that of the control group,and its desorption rate was lower than that of the control group.In the treatments with rutile particles,the amount of adsorbed Hg2+ increased with increasing of particle concentration,however Hg2+ was easily desorbed.When the particles concentration was 8 g/kg,its adsorption capacity was the maximum and was 18.18％ higher than that of the control group,but its desorption rate was the largest.Nano-TiO2 particles,especially anatase particles,enhance the Hg2+ adsorption capacity of soil,and this may impact the migration and transformation of Hg2+ in the environment.关键词
纳米TiO2/汞/土壤/吸附/解吸Key words
Nano-TiO2/Hg2+/soil/adsorption/desorption分类
资源环境引用本文复制引用
张金洋,王定勇,张成,王永敏,梁丽..纳米TiO2对土壤Hg2+吸附解吸性能的影响[J].水土保持学报,2017,31(5):345-349,5.基金项目
国家重点基础研究发展规划(973)项目(2013CB430004) （973）
四川省教育厅科研项目(16ZB0298) （16ZB0298）
