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Heavy metal adsorbent as well as preparation method and application thereof

A heavy metal and adsorbent technology, applied in non-metallic elements, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of poor removal of thallium, poor stability, limited application of adsorbent materials, etc., and meet the requirements of reaction conditions Low cost, low cost, simple operation effect

Pending Publication Date: 2021-07-16
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, most of the existing thallium removal adsorption materials have a good removal effect on thallium only under the condition of pH=7 or more. When the pH is small, most of the existing thallium removal adsorption materials are positively charged, while the waste water The thallium in the thallium is also positively charged, so the removal effect on thallium is not good, and some thallium removal adsorption materials have poor stability under acidic conditions
In actual working conditions, the pH of many thallium-containing wastewater is very low (such as mine wastewater pH = 2.7), thus limiting the practical application of adsorption materials

Method used

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  • Heavy metal adsorbent as well as preparation method and application thereof
  • Heavy metal adsorbent as well as preparation method and application thereof
  • Heavy metal adsorbent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Embodiment 1: preparation adsorbent

[0055] This embodiment prepared titanium tripolyphosphate heavy metal adsorbent-1, the specific process is:

[0056] Weigh 0.2mol Na 5 P 3 o 10 , dissolved in 200mL of water to obtain a solution;

[0057] Add concentrated nitric acid, adjust the pH of the solution to 1, stir the solution rapidly at room temperature, add 0.25molTi(SO 4 ) 2 , continue to stir for 1h, and then stand at room temperature for aging for 24h.

[0058] Pour off the above water, then add 1000mL deionized water, stir and wash for 10min, use suction filtration method for solid-liquid separation, continue to wash the solid filter cake with deionized water 4 times, after separating the adsorbent, put it in the oven Dry at 50°C for 2 hours, then raise the temperature to 100°C and dry for 12 hours to obtain titanium tripolyphosphate heavy metal adsorbent-1.

[0059] figure 1 with figure 2 This is the SEM picture of the adsorbent prepared in Example 1. It ...

Embodiment 2

[0061] Embodiment 2: preparation adsorbent

[0062] This embodiment prepared titanium tripolyphosphate heavy metal adsorbent-2, the specific process is:

[0063] Weigh 0.2mol Na 5 P 3 o 10 , dissolved in 200mL of water to obtain a solution;

[0064] Add concentrated nitric acid, adjust the pH of the solution to 2, stir the solution rapidly at room temperature, add 0.4molTi(SO 4 ) 2 . Then the mixture was poured into the reactor, and the hydrothermal reaction was continued in an oven at 100°C for 6h. After completion, take it out and let it stand at room temperature for 12 hours. Pour off the above water, then add 1000mL deionized water, stir and wash for 10min, use suction filtration method for solid-liquid separation, continue to wash the solid filter cake with deionized water for 3 times, after separating the adsorbent, put it in the oven Dry at 55°C for 8 hours, then raise the temperature to 100°C for 8 hours.

Embodiment 3

[0065] Embodiment 3: preparation adsorbent

[0066] This embodiment prepared titanium tripolyphosphate heavy metal adsorbent-3, the specific process is:

[0067] Weigh 0.2molNa 5 P 3 o 10 , dissolved in 200mL of water to obtain a solution;

[0068] Add concentrated nitric acid to adjust the pH of the solution to 0; at room temperature, stir the solution rapidly, add 0.5mol Ti(SO 4 ) 2 . Then the mixture was poured into the reactor, and the hydrothermal reaction was continued in an oven at 150°C for 6h. After completion, take it out and let it stand at room temperature for 8 hours. Pour off the above water, then add 1000mL deionized water, stir and wash for 10min, use suction filtration method for solid-liquid separation, continue to wash the solid filter cake with deionized water 4 times, after separating the adsorbent, put it in the oven Dry at 40°C for 12 hours, then raise the temperature to 100°C and dry for 6 hours to obtain titanium tripolyphosphate heavy metal ad...

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Abstract

The invention provides a heavy metal adsorbent as well as a preparation method and application thereof. The heavy metal adsorbent can play a role even under the condition that the pH value is relatively low, and heavy metal elements such as thallium in wastewater can be removed. The adsorbent disclosed by the invention has the advantages that the applicable pH value range is large, thallium in wastewater can be adsorbed even under the acidic condition of relatively low pH, the adsorption effect is good, thallium pollutants in various water bodies such as underground water, surface water, chemical wastewater and mine wastewater can be effectively removed, and the removal rate reaches 99.8%; and the adsorbent also has good removal capability on heavy metal elements such as cadmium, lead, copper, antimony, nickel and the like in water, and also has relatively good stability and heat resistance.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a heavy metal adsorbent and its preparation method and application. Background technique [0002] Methods for removing thallium pollutants include complexation and adsorption. Among them, the adsorption method is the most effective method for removing thallium pollutants in groundwater, surface water and industrial wastewater. The method has the advantages of simple operation, low cost, less sludge production and low risk of secondary pollution, and is suitable for water treatment systems with large treatment capacity and low pollutant concentration. [0003] The adsorption method uses solid materials as adsorbents to transfer thallium pollutants from the water phase to the surface of the adsorbent through physical adsorption, chemical adsorption or ion exchange, so as to achieve the purpose of removing thallium in water. [0004] In related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C01B25/37C02F1/28C02F101/20
CPCB01J20/0211B01J20/0292C01B25/372C02F1/281C01P2004/60C01P2004/03C01P2004/04C02F2101/20
Inventor 张高生胡胜平刘烨王玉琪李伙生李祥平陈永亨
Owner GUANGZHOU UNIVERSITY
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