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Aluminized hydrotalcite having strong fluorescence and preparation method thereof

A hydrotalcite and fluorescence technology, applied in chemical instruments and methods, luminescent materials, aluminum compounds, etc., can solve the problems of high cost, trouble, and difficulty in forming large-scale films

Inactive Publication Date: 2008-08-27
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is well known that 8-hydroxyquinoline aluminum (Alq 3 ) and other aluminum coordination chelates, as a class of fluorescent metal complexes with excellent comprehensive properties, have always been one of the fluorescent materials preferred for light-emitting or display devices, but the problems of difficulty in large-area film formation and high cost are still It is a problem that plagues its further application, and has become the focus of researchers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Formulated with 1.65 x 10 -2 mol of NaAlO 2 and 1.65×10 -2 molNaOH aqueous solution (A); prepared with 1.0×10 -1 mol of MgCl 2 Aqueous solution (B); preparation containing 1.65×10 -2 mol sodium stearate, 0.825×10 -2mol 8-hydroxyquinoline aqueous solution (C). Under vigorous stirring, simultaneously add solutions (A) and (B) to (C) solution dropwise, adjust the reaction mixture slurry to PH=11 with 20% aqueous sodium hydroxide solution, age at 80°C for 12 hours, and filter with suction 1. Wash the filter cake with water until the pH of the filter is 7-8, soak it with a small amount of absolute ethanol, wash the precipitate and filter it with suction, and dry the filter cake at 105±5°C for 2 hours to obtain aluminous hydrotalcite with strong fluorescence Sample (Al-LLDHS). Excited by ultraviolet light, it emits the strong characteristic blue-green fluorescence (487nm) of 8-hydroxyquinoline aluminum, and the fluorescence intensity is 3.9×10 3 (a.u.), the fluorescen...

Embodiment 2

[0022] Formulated with 5.0×10 -3 mol of NaAlO 2 and 5.0×10 -3 mol mol NaOH aqueous solution (A); prepared with 1.0×10 -1 mol of MgCl 2 Aqueous solution (B); preparation containing 5.0×10 -3 mol sodium hexadecyl fatty acid, 0.25×10 -3 mol 8-hydroxyquinoline aqueous solution (C). Under the action of ultrasonic waves, simultaneously add solutions (A) and (B) to solution (C) dropwise, adjust the reaction mixed slurry to PH=11 with 20% aqueous sodium hydroxide solution, age at 80°C for 12 hours, pump Filter and wash the filter cake with water until the pH of the filter is 7~8, soak it with a small amount of absolute ethanol, wash the precipitate and filter it with suction, and dry the filter cake at 105±5°C for 2 hours to obtain strong fluorescent aluminum-containing water. Talc sample (Al-LLDH S ). Excited by ultraviolet light, it emits the strong characteristic blue-green fluorescence (487nm) of 8-hydroxyquinoline aluminum, and the fluorescence intensity reaches 4.7×10 4...

Embodiment 3

[0024] Prepared with 1.0 x 10 -2 mol of NaAlO 2 and 1.0×10 -2 mol NaOH aqueous solution (A); prepared with 1.0×10 -1 mol of MgCl 2 Aqueous solution (B); preparation containing 1.0×10 -2 mol sodium dodecylbenzenesulfonate, 0.5×10 -2 mol 8-hydroxyquinoline aqueous solution (C). Under continuous strong stirring, simultaneously add solutions (A) and (B) to solution (C) dropwise, adjust the reaction mixture slurry to PH=11 with 20% aqueous sodium hydroxide solution, and age at 80°C for 12 hours , filter with suction, wash the filter cake with water until the pH of the filter is 7-8, soak with a small amount of absolute ethanol, wash the precipitate and then filter with suction, and dry the filter cake at 105±5°C for 2 hours to obtain a strong fluorescent aluminum-containing Hydrotalcite-like samples (Al-LLDH S ). Excited by ultraviolet light, it emits the strong characteristic blue-green fluorescence (487nm) of 8-hydroxyquinoline aluminum, and the fluorescence intensity rea...

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Abstract

The invention relates to a group of strong fluorescent hydrotalcite containing aluminium which has the simplest chemical formula of (M2+1-xAl3x(OH)-12)An-x / nx / mzB) and a process for preparation. The steps comprise reducing the content of aluminium ion (Al3+) in hydroxide lamellar of the hydrotalcite containing aluminium such as magnesium aluminium hydrotalcite and zinc aluminum hudrotalcite to an appropriate value and simultaneously coordinating ligand which is dissolved or dispersed in interlayer hydrophobicity anion, thereby effectively preventing fluorescence quenching of the aluminium ion (Al3+) which is utilized as a luminous center. And a special combining structure of the ligand or mixed ligand which is mixed in the interlayer anion and the aluminium ion (Al3+) which is embedded on the lamellar increases the dissymmetry of the coordinating aluminium ion (Al3+) which is utilized as the luminous center, simultaneously because the protective action of the hydrotalcite laminate structure, the heat stability of (Al-LLDHs) is increased, thereby obtaining a group of novel high fluorescent hydrotalcite containing aluminium which can emit relative aluminium coordination chelate strong fluorescence is different from the normal hydrotalcite containing aluminium without fluorescence.

Description

Technical field: [0001] The invention relates to a class of aluminum-containing hydrotalcites with strong fluorescence and a preparation method thereof Background technique: [0002] The simplest general formula is [M 2+ 1-x m 3+ x (OH) 2 ]A n- x / n .yH 2 O] hydrotalcite (layered double hydroxi-des, LDHs), the M 2+ For divalent cations such as Mg, Ni, Cu or Zn, M 3+ Isomorphic trivalent cations such as Al 3+ Wait, A n- as an interlayer anion such as CO 3 2- , Cl - , SO 4 2- , NO 3 - or other organic anions. Thanks to M 2+ partly by M 3+ After isomorphic substitution, the hydrotalcite slabs are positively charged, and the anions inserted between the layers are connected to the slabs with weak chemical bonds to balance the excess positive charges on the slabs, and a certain number of water molecules are filled into the interlayers. Due to the substitutability of the plate cations of LDHs and the switchability of the interlayer anions, various inorganic and ...

Claims

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Application Information

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IPC IPC(8): C01F7/00C09K11/64
Inventor 章文贡陈鸿
Owner FUJIAN NORMAL UNIV
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