Method for preparing arsenic adsorbent and method for treating waste water

An adsorbent and aqueous solution technology, which is applied in the synthesis field of nanoporous zirconia materials, can solve the problems of low recycling rate, low adsorption capacity, and difficult regeneration, and achieve mild synthesis conditions, simple synthesis methods, and easy elution and regeneration. Effect

Inactive Publication Date: 2012-10-03
CHONGQING THREE GORGES UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing arsenic adsorbents are limited in practical application due to their high price, low adsorption capacity, low recycling rate, difficult regeneration or unsatisfactory use effect after regeneration.

Method used

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  • Method for preparing arsenic adsorbent and method for treating waste water
  • Method for preparing arsenic adsorbent and method for treating waste water
  • Method for preparing arsenic adsorbent and method for treating waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Weigh 6.68 g (0.022mol) sodium lauryl sulfate into a 500 ml Erlenmeyer flask, add 99ml (5.5mol) water and stir until completely dissolved, then add 9.73ml (0.022mol) zirconium n-propoxide, adjust under stirring The pH of the solution reached 3, continued to stir for 30 min, stood still for 20 h, placed in an 80 °C oil bath for 120 h, filtered and washed with water and isopropanol, dried at 110 °C for 12 h, and then calcined at 550 °C for 3 h. In this embodiment, the zirconium oxide has a mesoporous structure of 2-50 nm through the structure-directing effect of the long-chain alkyl sodium sulfate. At the same time, sulfate ions and hydrogen ions were introduced into the pores of zirconia through long-chain alkyl sodium sulfate.

[0042] see figure 1 , this figure is the N of the material obtained in this example 2 Adsorption-desorption isotherm diagram. see figure 2 , which is the BJH pore size distribution of the material obtained in this example. From the figure a...

Embodiment 2

[0046] Weigh 7.66 g of sodium cetyl sulfate in a 500 ml conical flask, add 99 ml of water and stir until completely dissolved, then add 9.73 ml of zirconium n-propoxide, adjust the pH of the solution to 3 under stirring, continue stirring for 30 min, and let stand 20 h, placed in an 80°C oil bath for 5 days, filtered and washed with water and isopropanol, dried at 110°C for 12 h, and then calcined at 550°C for 3 h.

[0047] In the following examples, the materials of Example 1 and Example 2 were used respectively. Experiments have proved that the material prepared in Example 2 has the same performance as that in Example 1.

Embodiment 3

[0049] Weigh 0.05 g of the arsenic adsorbent prepared in Example 1, and put it into 50 ml of water sample with arsenic concentration of 44.7 mg / L prepared with sodium arsenate. At this time, the initial pH of the arsenic solution was determined to be 9.8, that is, the solution was alkaline and there were no free hydrogen ions; at the same time, the SO 4 2- The concentration is 0mg / L. After the above water sample was stirred at 25°C for 24 hours, the adsorbent adsorbed arsenate ions, and ZrO 2 HSO 4 +H 2 AsO 4 - →ZrO 2 ·H 2 AsO 4 - +H + +SO 4 2- Reaction. Water sample is measured again, at this moment, the arsenic concentration in the recorded solution is 1.2mg / L, calculates that this adsorbent is 43.5mg / g to the adsorption capacity of arsenic (Ⅴ); Recorded solution pH is 4.1, measured Get SO 4 2- The concentration is 90.6 mg / L, which means that the solution is acidic due to the above-mentioned ion exchange.

[0050] see image 3 1 among the figure is the infr...

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Abstract

The invention provides a method for preparing an arsenic adsorbent. The arsenic adsorbent has zirconium oxide of nano-pore structure. The material can effectively treat arsenate and arsenite in the waste water, and can be recycled after waste water treatment. Another objective of the invention is to provide a method for treating waste water containing arsenate or arsenite ions by the arsenic adsorbent prepared by the method. The method contains a 'regeneration' step, so that the arsenic adsorbent can be reused cyclically.

Description

technical field [0001] The invention relates to a synthesis method and a use method of a nanoporous zirconia material capable of treating arsenic-containing wastewater. In particular, it relates to a new material capable of removing arsenic from water and capable of regeneration. Background technique [0002] Arsenic exists widely in nature. Arsenic is highly toxic and has two forms in water, As(Ⅴ) and As(Ⅲ). The World Health Organization (WHO) recommends that the arsenic concentration standard in drinking water is 0.01 mg / L [S. R. Kanel, et al. At present, arsenic pollution is very common. Arsenic poisoning incidents have occurred in Australia, Canada, the United States, Japan, Argentina and other countries. In recent years, my country has also become a country with serious arsenic pollution. Five arsenic pollution incidents occurred in Chenxi County, Hechi, Guangxi, Yangzonghai, Yunnan, and Dashahe, Henan. Once arsenic pollution is formed, it will enter the human body o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28
Inventor 张六一付川李廷真平巍
Owner CHONGQING THREE GORGES UNIV
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