Environmental Science and Pollution Research

, Volume 24, Issue 30, pp 23783–23793 | Cite as

Remediation mechanisms of mercapto-grafted palygorskite for cadmium pollutant in paddy soil

  • Xuefeng Liang
  • Xu Qin
  • Qingqing Huang
  • Rong Huang
  • Xiuling Yin
  • Yanming Cai
  • Lin Wang
  • Yuebing Sun
  • Yingming Xu
Research Article

Abstract

The immobilization agent was the key factor that determined the success of remediation of heavy metal polluted soil. In this study, mercapto-grafted palygorskite (MP) as a novel and efficient immobilization agent was utilized for the remediation of Cd-polluted paddy soil in pot trials, and the remediation mechanisms were investigated in the aspect of soil chemistry and plant physiology with different rice cultivars as model plants. Mercapto-grafted palygorskite at applied doses of 0.1–0.3% could reduce Cd contents of brown rice and straws of different cultivars significantly. Both reduced DTPA-extractable Cd contents in rhizosphere and non-rhizosphere soil and decreasing Cd contents in iron plaques on rice root surfaces confirmed that MP was an efficient immobilization agent for Cd pollutant in paddy soil. In the aspect of soil chemistry, the pH values of rhizosphere and non-rhizosphere soils had no statistical changes in the MP treatment groups, but their zeta potentials decreased obviously, indicating that MP could enhance the fixation or sorption of Cd on soil compositions. In the aspect of antioxidant system, MP could increase POD activity of rice roots significantly to alleviate the stress of Cd to roots, and resulted in the decrease of T-AOC, SOD, and CAT activities of rice roots of the selected cultivars. MP had no inhabitation or enhancement effects on TSH of rice roots but enhance the contents of MTs and NPT to binding Cd to complete detoxification process. MP as a novel and efficient immobilization agent could complete the remediation effects through soil chemistry and plant physiological mechanisms.

Keywords

Remediation Mechanism Cadmium Mercapto Palygorskite 

Notes

Acknowledgments

The current research was supported by the Central Public Research Institutes Basic Funds for Research and Development (2016-szjj-wrxf-lxf), the National Natural Science Foundation of China (No. 41401362), and the Funds for Science and Technology Innovation Project from the Chinese Academy of Agricultural Sciences (No. CAAS-XTCX-2016018).

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Xuefeng Liang
    • 1
    • 2
  • Xu Qin
    • 1
    • 2
  • Qingqing Huang
    • 1
    • 2
  • Rong Huang
    • 1
    • 2
  • Xiuling Yin
    • 3
  • Yanming Cai
    • 1
    • 2
  • Lin Wang
    • 1
    • 2
  • Yuebing Sun
    • 1
    • 2
  • Yingming Xu
    • 1
    • 2
  1. 1.Innovation Team of Remediation for Heavy Metal Contaminated Farmlands, Agro-Environmental Protection InstituteMinistry of AgricultureTianjinPeople’s Republic of China
  2. 2.Key Laboratory of Original Environmental Pollution Control of MOA/Tianjin Key Laboratory of Agro-Environment and Agro-Product SafetyTianjinPeople’s Republic of China
  3. 3.College of Environment and ResourcesJilin UniversityChangchunPeople’s Republic of China

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