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Related Concept Videos

Radical Oxidation of Allylic and Benzylic Alcohols01:21

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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Zeolite-supported manganese oxides decrease the Cd uptake of wheat plants in Cd-contaminated weakly alkaline arable

Weihua Wang1, Tao Lu1, Lihu Liu1

  • 1Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China.

Journal of Hazardous Materials
|July 29, 2021
PubMed
Summary

Zeolite-supported manganese oxides effectively reduce cadmium (Cd) in soil and wheat, transforming it into a more stable form. This soil amendment shows promise for remediating Cd-contaminated agricultural lands.

Keywords:
Cadmium contaminationMn oxideSoil remediationWheatZeolite

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Area of Science:

  • Environmental Science
  • Soil Science
  • Materials Science

Background:

  • Cadmium (Cd) pollution in arable soils threatens food safety and human health.
  • Manganese (Mn) oxides are known for heavy metal adsorption, but their efficacy and mechanisms in upland soils are unclear.
  • Zeolite-supported Mn oxides offer a potential solution for soil remediation.

Purpose of the Study:

  • To investigate the impact of zeolite-supported Mn oxides on soil Cd availability and plant accumulation.
  • To elucidate the mechanism of Cd immobilization by this amendment in wheat.
  • To assess the stability and long-term performance of zeolite-supported Mn oxides in soil.

Main Methods:

  • Wheat pot experiments using zeolite-supported Mn oxides as soil amendment.
  • Analysis of soil available Cd and Mn content.
  • Fractionation analysis of soil Cd.
  • Measurement of Cd accumulation in wheat grains, straw, and roots.
  • Evaluation of amendment stability over two successive years.

Main Results:

  • Application of zeolite-supported Mn oxides decreased soil available Cd by 44.3% and increased available Mn by 61.9%.
  • Cd accumulation in wheat tissues was significantly inhibited, with maximum reductions of 65.0% in grains, 11.7% in straw, and 55.3% in roots.
  • Exchangeable Cd was transformed into more stable Fe-Mn oxide bound Cd.
  • The amendment demonstrated high chemical stability and consistent Cd immobilization performance over two years.

Conclusions:

  • Zeolite-supported Mn oxides are effective in reducing Cd availability and plant uptake in contaminated soils.
  • The mechanism involves the transformation of Cd into more stable soil fractions.
  • This amendment shows significant potential for the remediation of Cd-contaminated alkaline upland soils.