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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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Tuning the Electronic Structure and ROS Generation of BiOCl via Salt-Mediated Precipitation.

Marta Kowalkińska1, Szymon Dudziak1, Jakub Karczewski2

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Chemistry (Weinheim an Der Bergstrasse, Germany)
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Summary

Introducing metal salts during bismuth oxychloride (BiOCl) synthesis significantly alters its electronic structure and photocatalytic properties. Manganese and selenium modifications notably enhance BiOCl

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Photocatalysis

Background:

  • Bismuth oxychloride (BiOCl) is a promising photocatalyst, but its efficiency can be tuned by modifying its electronic structure.
  • The synthesis process and dopant choice critically influence the material's properties and performance.

Purpose of the Study:

  • To investigate the impact of various metal salts on the electronic structure and photocatalytic activity of BiOCl.
  • To understand the role of different dopants (Mo, Se, W, V, Ti, Mn, Hg, Pb) in BiOCl synthesis.

Main Methods:

  • Synthesis of BiOCl photocatalysts with different metal salt introductions.
  • Characterization using techniques to analyze crystal structure, elemental composition, morphology, surface area, and optical properties.
  • Density functional theory (DFT) calculations to understand Bi substitution effects.

Main Results:

  • Ti and Hg primarily affected crystal growth and morphology.
  • Mo, W, and V shifted absorption to the visible region but reduced photocatalytic activity.
  • Pb2+ and Mn2+ acted as acceptor defects, with MnCl2 leading to well-defined facets and enhanced activity via conduction band shift.
  • Selenium species (Se4+/S0) on BiOCl surfaces acted as electron traps, improving charge carrier lifetime and promoting H2O2 production.

Conclusions:

  • The choice of metal salt during BiOCl synthesis is crucial for tailoring its electronic structure and photocatalytic performance.
  • Manganese doping enhances BiOCl photocatalysis through improved charge separation and oxygen reduction.
  • Selenium modification promotes efficient charge trapping and hydrogen peroxide generation.