Preparation method for layered zinc-aluminum double hydroxide porous block used for dye adsorption

Abstract

The invention discloses a preparation method for a layered zinc-aluminum double hydroxide porous block used for dye adsorption. The preparation method comprises the following successive steps: 1) dissolving polyoxyethylene in a solvent and carrying out stirring; 2) separately adding anhydrous zinc chloride, aluminum chloride hexahydrate and urea into a homogeneous solution obtained in the step 1), carrying out a stirring reaction at 80 to 100 DEG C for 10 to 12 h and then carrying out cooling to room temperature; 3) adding 1,2-epoxypropane into a transparent clear solution obtained in the step 2) and carrying out uniform mixing under stirring; 4) sealing a solution obtained in the step 3) in a container and then carrying out gelling at 40 to 60 DEG D; 5) ageing gel obtained in the step 4) under hermetic conditions and then soaking the gel with a solvent with low surface tension; and 6) drying the aged gel obtained in the step 5) at 60 to 120 DEG C for 24 to 72 h so as to obtain the layered zinc-aluminum double hydroxide porous block.

Description

technical field [0001] The invention relates to a preparation method of a layered zinc-aluminum double hydroxide porous block for adsorbing organic dyes. Background technique [0002] Layered double hydroxide (LDH) is a new type of inorganic functional material with layered structure, also known as hydrotalcite, its chemical formula is [M 1-x 2+ M x 3+ (OH) 2 ](A n- ) x / n ·xH 2 O, where M 2+ Represents a divalent metal cation such as Mg 2+ , Zn 2+ , Cu 2+ wait, M 3+ represents a trivalent metal cation such as Al 3+ , Co 3+ , Fe 3+ wait, A n- represents an anion, such as CO 3 2- , Cl - , NO 3 - etc, x is M 3+ / (M 3+ +M 2+ ) ratio, usually x is between 0.2 and 0.33, and its molecular structure is relatively stable. The layered hydroxide has no fixed chemical formula composition, and the types and composition ratios of metal elements constituting the laminates, as well as the types of interlayer anions, can be adjusted to obtain layered hydroxides with d...

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Problems solved by technology

[0004] Patent CN106241856A discloses a preparation method of zinc-magnesium-aluminum hydrotalcites. After adding zinc nitrate, magnesium nitrate, aluminum nitrate and urea into 40ml deionized water, stirring and dissolving, they are transferred to a hydrothermal kettle for a period of time, and then used Wash the precipitate with water and ethanol and dry it at 70°C to obtain zinc-magnesium-aluminum ternary hydrotalcite, but this method uses a hydrothermal method and needs to be reacted in a hydrothermal kettle

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