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Titanium-oxygen cluster gel adsorbent and application thereof

A technology of adsorbents and titanium oxide clusters, applied in the direction of adsorption of water/sewage treatment, other chemical processes, alkali metal oxides/hydroxides, etc., can solve high energy consumption, limited applications, and cannot be removed by electrostatic adsorption, etc. problem, achieve good effect, improve adsorption effect, and simple steps

Inactive Publication Date: 2020-05-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned above, trivalent arsenic in groundwater is electrically neutral and cannot be removed by electrostatic adsorption
Patent CN200610049186.5 discloses a method for preparing a non-cracking titanium dioxide film, which uses isopropyl titanate as the titanium source to hydrolyze and then hydrothermally synthesizes the intermediate product titanium dioxide gel, and then sinters to obtain the titanium dioxide film. Due to this scheme, the titanium-based gel The structure does not contain organic ligands such as acetylacetone complexed on the titanium surface, and the preparation process needs to be formed by hydrothermal calcination, which requires high energy consumption, which limits its application in water pollution control
At present, there is no public report on the removal of As(III) in water by adsorption of titanium-based materials.

Method used

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  • Titanium-oxygen cluster gel adsorbent and application thereof
  • Titanium-oxygen cluster gel adsorbent and application thereof
  • Titanium-oxygen cluster gel adsorbent and application thereof

Examples

Experimental program
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Embodiment 1

[0033] Example 1 Preparation of titanium oxide cluster gel adsorbent and arsenic removal test in water samples

[0034] (1) Preparation of titanium oxide cluster gel adsorbent

[0035]a. Drop 10 mL of tetrabutyl titanate into a mixture of alcohol solvent (10 mL) and acetylacetone (1.5 mL), stir at room temperature at a rate of 100 rpm for 30 minutes, and the obtained transparent solution is liquid A;

[0036] The mol ratio of acetylacetone and Ti is 1:2 in the present embodiment;

[0037] In this embodiment, ethanol is selected as the alcohol solvent, and the alcohol solvent is only used as the carrier of the organic titanium source in the reaction, and various alcohols that are commonly used at present can be selected, such as methanol, ethanol, propanol, butanol, octanol, pentanol, etc. Any one or more of alcohol, hexanol, heptanol, dedecyl alcohol, ethylene glycol, glycerin, propylene glycol, pentaerythritol, propylene alcohol, vinyl alcohol.

[0038] b. 10mL alcoholic so...

Embodiment 2

[0081] a. Drop 10 mL of tetrabutyl titanate into a mixture of tert-butanol (10 mL) and acetylacetone (1.5 mL), stir at room temperature at a rate of 100 rpm for 30 minutes, and the obtained transparent solution is liquid A;

[0082] The mol ratio of acetylacetone and Ti is 1:2 in the present embodiment;

[0083] b. 10mL of tert-butanol and 3mL of deionized water are fully mixed to form a hydroalcoholic solution;

[0084] c. Drop the hydroalcoholic solution into liquid A at a rate of 1 mL / min, and then continuously stir the solution at a rate of 100 rpm for 30 min to obtain a stable gel.

[0085] d. Place the obtained gel in a lyophilizer (the lyophilization temperature is about -38° C.) to a constant weight (about 3 d), and then the titanyl cluster gel adsorbent is obtained. In practice, generally freeze-drying at a temperature of -45 to -15°C for 24 to 72 hours can achieve the purpose of the invention.

Embodiment 3

[0087] a. Drop 10 mL of tetrabutyl titanate into a mixture of ethanol (10 mL) and acetylacetone (0.75 mL), stir at room temperature at a rate of 100 rpm for 30 minutes, and the obtained transparent solution is liquid A;

[0088] In the present embodiment, the mol ratio of acetylacetone and Ti is 1:4;

[0089] b. 10mL ethanol and 3mL deionized water are fully mixed to form a hydroalcoholic solution;

[0090] c. Drop the hydroalcoholic solution into liquid A at a rate of 1 mL / min, and then continuously stir the solution at a rate of 100 rpm for 30 min to obtain a stable gel.

[0091] d. Aging the obtained gel in a fume hood at 30°C to constant weight (about 7d) to obtain the titanium oxide cluster gel adsorbent.

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Abstract

The invention provides a titanium-oxygen cluster gel adsorbent and application thereof. The adsorbent is prepared by the following steps: adding an organic ligand into a mixed solution of an organic titanium source and an alcohol solvent to obtain a solution A, then slowly and dropwise adding a water-alcohol solution into the solution A, stirring until gel is formed, and finally carrying out aginguntil the weight is constant or performing freeze-drying to obtain the titanium-oxygen cluster gel adsorbent. The adsorbent can be applied to treatment of underground water and drinking water, adsorbs various heavy metal pollutants, and is good in adsorption effect and high in stability, and a simple, convenient and feasible scheme for communities or families in heavy metal polluted areas is provided.

Description

technical field [0001] The invention relates to the technical field of water treatment, and relates to an adsorbent for efficiently removing heavy metal pollutants in water. Background technique [0002] Naturally occurring heavy metals in groundwater, especially arsenic (As), pose a serious threat to public health and are one of the worldwide environmental problems. Long-term drinking of arsenic-containing groundwater may cause serious health problems, such as neurological symptoms and skin lesions, and even cancer. Various techniques have been used to treat As in water, including conventional adsorption, sand filtration, coagulation, ion exchange, and membrane filtration. Among them, adsorption is considered to be the most applicable treatment method at present. However, since trivalent arsenic (As(III)) is uncharged in natural water, it is difficult to remove by adsorption. Therefore, it usually needs to be oxidized to pentavalent arsenic (As(V)), which is charged unde...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F103/06C02F101/20
CPCB01J20/22B01J20/06B01J20/28047C02F1/281C02F2103/06C02F2101/20
Inventor 张淑娟张晨吴兵党潘丙才
Owner NANJING UNIV
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