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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Removing Lead from Contaminated Sediment Using Indium-Based Perovskite Precursor.

Chen Tian1,2, Zhenye Liang1,2, Liwei Cheng1,2

  • 1Shanghai Synchrotron Radiation Facility (SSRF), Zhangjiang Lab., Shanghai Advanced Research Institute & Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China.

Nanomaterials (Basel, Switzerland)
|December 23, 2022
PubMed
Summary

This study introduces a novel method for heavy metal remediation by using indium-based perovskites to replace lead in river sediments. This approach offers a new avenue for sediment pollution control and pollutant reuse.

Keywords:
GIWAXSPb replacementin situperovskitesynchrotron-based radiation experiment

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Heavy metal pollution in river and lake sediments poses significant risks to ecological safety and human health.
  • Current remediation strategies primarily focus on pollutant adsorption and sediment repair, with limited exploration of pollutant reuse.
  • Lead (Pb) halide perovskites, known for their excellent photoelectric properties, are a rapidly developing area in solar cell technology.

Purpose of the Study:

  • To propose and investigate a novel method for remediating heavy metal pollution in sediments.
  • To explore the potential of using indium (In)-based perovskites to replace lead (Pb) ions in river and lake sediments.
  • To analyze the distribution of heavy metal Pb in sediment samples and understand the reaction mechanism.

Main Methods:

  • Collection and analysis of three sediment samples from a river in Shanghai Peace Park to determine heavy metal Pb distribution.
  • Mixing sediment digestion solutions with a prepared CH3NH3(MA)InICl2 (indium-based perovskite precursor) solution.
  • Conducting in situ synchrotron radiation X-ray diffraction (XRD) experiments to elucidate the reaction mechanism.

Main Results:

  • Indium (In) in the perovskite precursor solution was observed to be gradually replaced by lead (Pb) ions present in the sediments.
  • The reaction mechanism between the sediment and the indium-based perovskite solution was revealed through in situ synchrotron radiation XRD.
  • Demonstrated a new approach for the comprehensive reuse of sediment pollutants.

Conclusions:

  • Introduced a novel method for remediating heavy metal pollution in river and lake sediments.
  • Proposed the use of indium-based perovskites as a viable agent for lead removal from sediments.
  • Highlighted the potential for future research into the comprehensive reuse of sediment pollutants.