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[Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance as well as preparation method and application thereof

A molecular cage and crystal state technology, applied in the field of crystal material preparation, can solve problems such as environmental pollution

Active Publication Date: 2020-09-29
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of using cyanide to leach and recover silver, the improper treatment of waste liquid will usually cause serious pollution to the environment, such as exposure to the air or accidental leakage. From the perspective of protecting the environment, through environmentally sound chemistry, the development of Environmentally friendly new silver recovery process, alternative to leaching silver with toxic cyanide salts is a priority

Method used

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  • [Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance as well as preparation method and application thereof
  • [Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance as well as preparation method and application thereof
  • [Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Measure red (Ti 4 L 6 ) crystals (100mg, 0.04mmol), silver acetate (30mg, 0.18mmol), ethanol (2mL) and distilled water (3mL) were placed in a 20mL glass bottle, mixed well at room temperature, and added to the mixed reaction system Ammonia water (0.3mL) with a concentration of 29% was placed in an oven at 80°C for a constant temperature reaction for 3 days, taken out, and left to stand at room temperature for 15 days to separate the solid phase, and then rinse the solid phase with ethanol to obtain a red parallelepiped [Ag(NH 3 ) 2 ] 6 @Ti 4 L 6 Molecular cage crystals.

[0044] After testing, the [Ag(NH) prepared in Example 1 3 ) 2 ] 6 @Ti 4 L 6 The yield of molecular cage crystals was 90%.

[0045] [Ag(NH) prepared in Example 1 3 ) 2 ] 6 @Ti 4 L 6 The crystal parameters of the molecular cage crystals are shown in Table 2.

[0046] Table 2

[0047]

[0048] The structural confirmation data of embodiment 1 product sees Figure 1-3 .

Embodiment 2

[0049] The purification of embodiment 2 silver

[0050] Select a certain amount of Ag in the experiment + ions (which contain 58%wt Ag + and 42% wt Pb 2+ , Zn 2+ , %wtPb 2+ >Zn 2+ ) waste liquid 10mL, add 1mL 29% ammonia water, fully complexed. Filter to remove most of the Pb(OH) 2 Insoluble matter, then add 100mg Ti to the filtrate 4 L 6 Molecular cage, stirring, heating at 80°C for 6 hours, standing at room temperature for a week, Ti 4 L 6 Molecular cages react with silver ammonium ions. The precipitated [Ag(NH 3 ) 2 ] 6 @Ti 4 L 6 Molecular cage crystals were separated by filtration, and Ag remained in the filtrate + Can continue to invest in Ti 4 L 6 Molecular cage coprecipitation recovery. Co-precipitated solid product [Ag(NH 3 ) 2 ] 6 @Ti 4 L 6 Molecular cage crystals were dissolved in a mixed solution of distilled water and ethanol, and then 10 μL of hydrazine hydrate was added dropwise to restore Ag or Ag 2 O precipitation. Restore the recovere...

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Abstract

The invention belongs to the technical field of crystal material preparation, and particularly relates to a [Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance as well as a preparation method and application thereof. The inventor successfully designs and synthesizes the [Ag(NH3)2]6@Ti4L6 molecular cage crystal substance. The synthesis process is less in pollution and meets the green and environment-friendly requirements. Besides, the [Ag(NH3)2]6@Ti4L6 molecular cage crystal substance prepared by the synthesis method has a tetrahedral cage structure, the yield is up to 90% or above, and theproduct can be used for separating silver from silver ores or recovering silver from silver-containing waste liquid. By the adoption of the method, silver in the silver ores or the silver-containing waste liquid can be converted into the [Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance, and the[Ag(NH3)2]6@Ti4L6 molecular cage crystalline substance can be reduced into elemental silver or silver oxide. Therefore, from the perspective of environmental protection, an environment-friendly new silver recovery process is developed through environmentally friendly chemistry, and a feasible method is provided for replacing toxic cyanide salt to leach silver.

Description

technical field [0001] The invention belongs to the technical field of crystal material preparation, in particular to [Ag(NH 3 ) 2 ] 6 @Ti 4 L 6 Molecular cage crystalline substance and its preparation method and application. Background technique [0002] In the past ten years, my country's economy has developed rapidly, and people's demand for silver has continued to increase. The source of silver is mainly extracted from silver ore. The typical method of industrial silver extraction process is to soak silver ore with highly toxic cyanide to obtain water-soluble silver-containing inorganic cyanide, and then recover silver by cementation separation, absorption or solvent extraction and calcination. However, in the process of using cyanide to leach and recover silver, the improper treatment of waste liquid will usually cause serious pollution to the environment, such as exposure to the air or accidental leakage. From the perspective of protecting the environment, throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F19/00C30B29/54C30B7/14C22B11/00C22B3/14C22B7/00
CPCC07B2200/13C22B3/14C22B7/008C22B11/04C22B11/042C30B7/14C30B29/54Y02P10/20
Inventor 陈光辉何燕萍张磊张健
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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