チオール機能化されたメソ構造化シリカの水銀結合部位
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
まとめ
チオール機能化されたシリカは水から水銀を効果的に除去します. 研究によると,水銀は硫黄と結合し,クラスターを形成し,水銀濃度が上昇すると調整が変化します.
科学分野:
- マテリアルサイエンス 材料科学
- 環境化学 環境化学
- ナノテクノロジー ナノテクノロジー
背景:
- チオール機能化されたメソポラスシリカは,重金属のリメディケーションの可能性を示しています.
- 水銀結合メカニズムを理解することは,除去効率を最適化するために非常に重要です.
研究 の 目的:
- チオール機能化されたメソ構造化シリカにおける水銀結合メカニズムを解明するため.
- 水銀吸附による構造的,化学的変化を調査する.
主な方法:
- 原子対分布関数 (PDF) 解析によるシンクロトロンX線粉砕分析.
- ラマン光譜法. ラマン光譜法.
- 異なる機能化レベル (x=0.30,0.50) のチオール機能化されたメソポラスシリカの合成.
主要な成果:
- 硫黄酸チオラート原子を水銀イオンに橋渡しし,表面鎖を形成する証拠.
- 有意なHg-O結合は検出されず,酸素の調整を排除した.
- 水銀センターは,負荷に関係なく,チオラートブリッジングを通じてクラスタ化されます.
- 水銀の複合化は,中性 (四面体協調) から低負荷で,高負荷で亜陽性 (線形協調) に変化し,対離子として窒素を用います.
結論:
- チオール機能化されたシリカは,主に硫黄の調整によって水銀を結合する.
- 結合機構と水銀の特異性は,水銀負荷に依存しています.
- これらの発見は,水銀除去のための高度な吸収剤を設計するための洞察を提供します.
関連する概念動画
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...