Video Experimental Relacionado
Updated: Jul 16, 2026
06:34
Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
Published on: June 20, 2014
Sitios de unión de mercurio en sílice mesostructurada tiol-funcionalizada
Simon J L Billinge1, Emily J McKimmy, Mouath Shatnawi
1Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA.
Journal of the American Chemical Society
|June 9, 2005
Resumen
La sílice funcionalizada con tiol elimina efectivamente el mercurio del agua. La investigación revela que el mercurio se une al azufre, formando grupos y cambiando la coordinación con el aumento de los niveles de mercurio.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química del medio ambiente Química del medio ambiente
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- La sílice mesoporosa funcionalizada con tiol demuestra potencial para la remediación de metales pesados.
- Comprender el mecanismo de unión del mercurio es crucial para optimizar la eficiencia de la eliminación.
Objetivo del estudio:
- Para dilucidar el mecanismo de unión del mercurio en la sílice mesostructurada tiol-funcionalizada.
- Para investigar los cambios estructurales y químicos durante la adsorción de mercurio.
Principales métodos:
- Difracción de polvo de rayos X de sincrotrón con función de distribución de pares atómicos (PDF). análisis.
- Espectroscopia de Raman Espectroscopía de Raman Espectroscopía de Raman Espectroscopía de Raman Espectroscopía de Raman Espectroscopía de Raman Espectroscopía de Raman
- Síntesis de sílice mesoporosa funcionalizada con tiol con diferentes niveles de funcionalización (x = 0,30, 0,50).
Principales resultados:
- Evidencia de puentes entre átomos de tiolato de azufre y iones de mercurio, formando cadenas superficiales.
- No se detectaron enlaces Hg-O significativos, lo que excluye la coordinación del oxígeno.
- Los centros de mercurio se agrupan a través de puentes de tiolato, independientemente de la carga.
- La complejación de mercurio cambia de neutro (coordinación tetraédrica) a baja carga a catiónico (coordinación lineal) a alta carga, con el nitrato como un anión contra.
Conclusiones:
- La sílice tiol-funcionalizada se une al mercurio principalmente a través de la coordinación con el azufre.
- El mecanismo de unión y la especiación del mercurio dependen de la carga de mercurio.
- Estos hallazgos proporcionan información para el diseño de sorbentes avanzados para la eliminación de mercurio.
Videos de Conceptos Relacionados
02:46Covalent Bonding and Lewis Structures
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
02:16Resonance and Hybrid Structures
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
01:41The Supercomplexes in the Crista Membrane
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
01:01Introduction to Chemical Bonds
Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...