arsenic-removing adsorbent with IB group metal nanoparticles loaded on zinc zirconium composite oxide and preparation method thereof

A metal nanoparticle and composite oxide technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc. The effect of large capacity, less usage and fast adsorption rate

Active Publication Date: 2018-01-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toxicity of trivalent arsenic is 25-60 times higher than that of pentavalent arsenic. Although the toxicity of pentavalent arsenic is low, it will seriously pollute the environment, damage the ecological environment of water bodies, and even endanger human health.
However, in these two examples, the nano-CuO arsenic-removing adsorbent has the problem of secondary pollution caused by a large amount of use, copper ion release and nano-particle residue.

Method used

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  • arsenic-removing adsorbent with IB group metal nanoparticles loaded on zinc zirconium composite oxide and preparation method thereof
  • arsenic-removing adsorbent with IB group metal nanoparticles loaded on zinc zirconium composite oxide and preparation method thereof
  • arsenic-removing adsorbent with IB group metal nanoparticles loaded on zinc zirconium composite oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 20 mL of deionized water was used as the co-precipitation bottom solution, and 1.0 M Na 2 CO 3 The pH of the solution was adjusted to 10, and then the temperature was kept constant at 70 °C in a water bath. 0.25 M HAuCl 4 solution, 1.0 M Zn(NO 3 ) 2 solution and 1.0 M ZrOCl 2 ·8H 2 O solution in a certain ratio of substances ( n (Au) / n (Zn) / n (Zr)= 0.05:0.5:1) to prepare mixed metal salt solution. The precipitant uses 1.0 MNa 2 CO 3 solution. Under the condition of magnetic stirring, 46.6 mL of precipitant solution was first added dropwise to the above bottom liquid, and then 24.5 mL of mixed metal salt solution was added dropwise for co-precipitation, and the final pH value was 9~10. After the dropwise addition, continue stirring for 1.0 h to carry out heating and hydrolysis of the precipitate. The hydrolysis temperature is 70° C. and the hydrolysis time is 1 h. After the hydrolysis is completed, take it out and let it stand to cool to room temperature, ...

Embodiment 2

[0040] 20 mL of deionized water was used as the co-precipitation bottom solution, and 1.0 M Na 2 CO 3 The pH of the solution was adjusted to 10, and then the temperature was kept constant at 70 °C in a water bath. 0.25 M HAuCl 4 solution, 1.0 M Zn(NO 3 ) 2 solution and 1.0 M ZrOCl 2 ·8H 2 O solution in a certain ratio of substances ( n (Au) / n (Zn) / n (Zr)= 0.05:0.5:1) to prepare mixed metal salt solution. The precipitant uses 1.0 MNa 2 CO 3 solution. Under the condition of magnetic stirring, 46.6 mL of precipitant solution was first added dropwise to the above bottom liquid, and then 24.5 mL of mixed metal salt solution was added dropwise for co-precipitation, and the final pH value was 9~10. After the dropwise addition, continue stirring for 1.0 h to carry out heating and hydrolysis of the precipitate. The hydrolysis temperature is 70° C. and the hydrolysis time is 1 h. After the hydrolysis is completed, take it out and let it stand to cool to room temperature, ...

Embodiment 3

[0042] 20 mL of deionized water was used as the co-precipitation bottom solution, and 1.0 M Na 2 CO 3 The pH of the solution was adjusted to 10, and then the temperature was kept constant at 70 °C in a water bath. 0.25 M HAuCl 4 solution, 1.0 M Zn(NO 3 ) 2 solution and 1.0 M ZrOCl 2 ·8H 2 The O solution is divided into certain substance ratios ( n (Au) / n (Zn) / n (Zr)=0.13:3:1) to prepare metal salt solution. The precipitant uses 1.0 MNa 2 CO 3 solution. Under the condition of magnetic stirring, 46.6 mL of precipitant solution was first added dropwise to the above bottom liquid, and then 24.5 mL of mixed metal salt solution was added dropwise for co-precipitation, and the final pH value was 9~10. After the dropwise addition, continue stirring for 1.0 h to carry out heating and hydrolysis of the precipitate. The hydrolysis temperature is 70° C. and the hydrolysis time is 1 h. After the hydrolysis is completed, take it out and let it stand to cool to room temperatur...

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Abstract

The invention discloses an arsenic-removing adsorbent with IB group metal nanoparticles loaded on a zinc zirconium composite oxide and a preparation method thereof. The method comprises the followingsteps: firstly, preparing an IB group metal salt solution, a zinc salt solution and a zirconium salt solution into a mixed metal salt solution; with the deionized water with pre-regulated pH value asa base solution, adding the mixed metal salt solution and a precipitant solution for co-precipitating and controlling an end point pH value within a range of 7-10; ending the dropwise adding, continuously stirring, heating and hydrolyzing the precipitate; centrifugally separating, thereby acquiring a hydrolysis product; washing, centrifuging, drying and baking, thus obtaining the arsenic-removingadsorbent. The arsenic-removing adsorbent prepared according to the invention is high in specific surface area and narrow in pore size distribution; the metal nanoparticles are highly dispersed and loaded onto an amorphous composite oxide carrier, so that the arsenic-removing adsorbent has the characteristics of high removal rate, high adsorption capacity, less dosage, high adsorption rate, and the like; the arsenic-removing adsorbent can be used for deeply treating the low-concentration arsenic pollutants in underground water and surface water and the low-concentration arsenic-bearing industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of preparation of arsenic-removing adsorbent, and in particular relates to a zinc-zirconium composite oxide-supported IB group metal nanoparticle-arsenic-removing adsorbent and a preparation method thereof. Background technique [0002] Wastewater discharged from industries such as chemical industry, metallurgy, acid making, pesticides and mining often contains relatively high concentrations of inorganic arsenic, mainly in the form of trivalent arsenic and pentavalent arsenic, and the ratio of the two depends on the oxidation-reduction potential and pH value of the wastewater . The toxicity of trivalent arsenic is 25-60 times higher than that of pentavalent arsenic. Although the toxicity of pentavalent arsenic is low, it will seriously pollute the environment, damage the ecological environment of water bodies, and even endanger human health. Therefore, it is necessary to purify the arsenic-containing wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F101/10
Inventor 华金铭胡俊
Owner FUZHOU UNIV
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