Effect of Nano-TiO2 on the Adsorption and Desorption of Hg2+in Soil

doi:10.13870/j.cnki.stbcxb.2017.05.054

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Effect of Nano-TiO2 on the Adsorption and Desorption of Hg2+in Soil

更新时间：2025-03-12

- Effect of Nano-TiO2 on the Adsorption and Desorption of Hg2+in Soil
- Vol. 31, Issue 5, Pages: 345-349(2017)
- 作者机构：
  
  1. 内江师范学院化学化工学院,四川,内江,641112
  2. 西南大学资源环境学院,重庆,400716
  3. 重庆市农业资源与环境研究重点实验室,重庆,400716
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.05.054
  CLC： X53
- Published：2017
- 稿件说明：
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Effect of Nano-TiO2 on the Adsorption and Desorption of Hg2+in Soil[J]. 2017, 31(5): 345-349.
DOI：

Effect of Nano-TiO2 on the Adsorption and Desorption of Hg2+in Soil[J]. 2017, 31(5): 345-349. DOI： 10.13870/j.cnki.stbcxb.2017.05.054.

摘要

为了研究纳米TiO2对土壤吸附解吸汞性能的影响，以三峡水库消落区土壤为代表，选择2种晶型（锐钛矿和金红石）的纳米TiO2颗粒，设置3个浓度梯度（2，4，8 g/kg），制成含有不同浓度纳米TiO2颗粒的土样，配制不同浓度的Hg2+溶液，进行吸附解吸试验。结果表明：纳米TiO2颗粒可提高土壤对Hg2+的吸附量，但受颗粒的晶型和浓度的影响；锐钛矿颗粒对土壤吸附解吸Hg2+的影响更大，其吸附作用力更强，不易解吸，其中4 g/kg处理组吸附作用最强，与对照相比，最大吸附量可提高32.65%，且其解吸率低于对照组；金红石颗粒处理组对Hg2+的吸附量随颗粒浓度的升高而增大，但吸附作用力较弱，容易被解吸，8 g/kg处理组影响最大，与对照相比，最大吸附量提高18.18%，但其解吸率也最大。因此，纳米TiO2颗粒增强土壤对汞的吸附作用，从而可能影响汞在环境中的迁移转化过程，特别是锐钛矿型颗粒。

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

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.

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