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Preparation and application of chromotropic acid intercalated hydrotalcite composite material

A composite material and hydrotalcite technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., to achieve high selectivity and high effectiveness

Inactive Publication Date: 2013-08-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chromotropic acid anion is in the confined space between the hydrotalcite layers. After it adsorbs and chelates heavy metal ions, the convenience of hydrotalcite separation and recovery is used to solve the problem of adsorbent recovery.

Method used

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  • Preparation and application of chromotropic acid intercalated hydrotalcite composite material
  • Preparation and application of chromotropic acid intercalated hydrotalcite composite material
  • Preparation and application of chromotropic acid intercalated hydrotalcite composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Take Chromotropic acid and use 200ml to remove CO 2 deionized water to prepare a concentration of 0.3mol / L Chromotropicacid solution, adjust the pH value to 7 with 2M NaOH solution; then add 0.06molZn(NO 3 ) 2 ·6H 2 O, 0.02molAl(NO 3 ) 3 9H 2 O;

[0020] 2) Take 9.60g NaOH and use 200ml to remove CO 2 deionized water to prepare alkaline solution;

[0021] 3) Add the solution prepared in step 1) and step 2) into the colloid mill with a rotation speed of 3000rpm and mix for 2 minutes, and the obtained suspension is placed in an inert atmosphere N 2 Reflux aging at 97°C for 8 hours under protection, the product was centrifuged and washed 4 times, and dried in vacuum to obtain the Chromotropicacid intercalated hydrotalcite composite material Zn 3 Al-CTA-LDH, its chemical formula is [Zn 2+ 1-x al 3+ x (OH) 2 ] x+ (C 10 h 6 o 8 S2 2- ) x / 2 ﹒ 3H 2 O, x=0.25.

Embodiment 2

[0023] 1) Take Chromotropic acid and use 200ml to remove CO 2 deionized water to prepare a concentration of 0.8mol / L Chromotropicacid solution, adjust the pH value to 7 with 2M NaOH solution; then add 0.06molMg(NO 3 ) 2 ·6H 2 O, 0.02molAl(NO 3 ) 3 9H 2 O;

[0024] 2) Take 9.6g NaOH and use 200ml to remove CO 2 deionized water to prepare alkaline solution;

[0025] 3) Add the solution prepared in step 1) and step 2) into the colloid mill with a rotation speed of 3000rpm to mix for 4 minutes, and the obtained suspension is placed in an inert atmosphere N 2 Reflux aging at 97°C for 10 h under protection, the product was centrifuged and washed 3 times, and dried in vacuum to obtain the Chromotropicacid intercalated hydrotalcite composite material Mg 3 Al-CTA-LDH, its chemical formula is [Mg 2+ 1-x Al 3+ x (OH) 2 ] x+ (C 10 h 6 o 8 S 2 2- ) x / 2 ﹒ 5H 2 O, x=0.25.

[0026] In order to verify the adsorption performance of the Chromotropicacid intercalated hydrot...

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Abstract

The invention belongs to the technical field of preparation of inorganic composite materials and specifically relates to a chromotropic acid intercalated hydrotalcite composite material, as well as a preparation method and an application thereof. The chemical general formula of the chromotropic acid intercalated hydrotalcite composite material disclosed by the invention is (M2+1-xM3+x(OH)2)x+(A2-)x / 2. mH2O, wherein M<2+> is Zn<2+> or Mg<2+>, M<3+> is Al<3+>, and M<2+> and M<3+> are positioned on a hydrotalcite main body layer plate; A<2-> is interlayer chromotropic acid anion C10H6O8S2<2->; x is the molar ratio value of M<3+> / (M<2+>+M<3+>), and x is not less than 0.2 and not more than 0.33; and m is the number of interlayer water molecules, and m equals to 3-6. According to the preparation method disclosed by the invention, a nucleation / crystallization separation method is adopted for inserting chromotropic acid anions between hydrotalcite layers, and alkaline hydroxyl groups on the surface of the hydrotalcite layer plate are further utilized for promoting heavy metal ion precipitation, so that the adsorption efficiency against heavy metal ions is further improved. The chromotropic acid anions are positioned in a restricted domain space between the hydrotalcite layers, and after adsorption and chelation of the heavy metal ions, the convenience in separation and recovery of the hydrotalcite is utilized for solving the problem of recovery of an adsorbent.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic composite materials, in particular to a chromotropic acid intercalated hydrotalcite composite material and a preparation method thereof, which is applied to the selective adsorption of Cr(VI) and Cu(II) in heavy metal ion sewage. Background technique [0002] Hydrotalcite-like intercalation materials (LDHs) are a new type of nano-inorganic functional materials with a layered structure. Its structure is similar to that of brucite. The general composition formula can be expressed as: [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A n- ) x / n mH 2 O, where M 2+ and M 3+ Respectively, divalent and trivalent metal cations in the laminate, such as: Mg 2+ 、Ni 2+ 、Co 2+ , Zn 2+ 、Cu 2+ and Al 3+ 、Cr 3+ , Fe 3+ 、Sc 3+ etc.; A n- is an interlayer anion, such as: CO 3 2- , NO 3 - , Cl - , OH - , SO 4 2- 、PO 4 3- 、C 6 h 4 (COO) 2 2- , heteropolyanions, etc.; x is M 3+ / (M 2+ +...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 宋宇飞陈阳
Owner BEIJING UNIV OF CHEM TECH
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