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A heavy metal ion absorbent and application thereof in removal of heavy metal ion

A technology of heavy metal ions and adsorbents, applied in the direction of adsorption of water/sewage treatment, other chemical processes, chemical instruments and methods, etc., to achieve stable effects and high removal efficiency

Inactive Publication Date: 2007-05-16
SHANDONG UNIV
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Problems solved by technology

[0004] It has been reported that the roasted hydrotalcite has a strong effect on heavy metal anions (CrO 4 2- ) has a high removal efficiency, but the heavy metal ion adsorbent is prepared by proper low-temperature roasting with binary hydrotalcite as the precursor, so as to realize the removal of heavy metal cations such as: Ni 2+ , Pb 2+ , Hg + , Hg 2+ 、Ag + 、Cd 2+ , Zn 2+ 、Cu 2+ , Fe 2+ , Fe 3+ 、Co 3+ 、Co 2+ And ions of noble metals such as rhodium, platinum, palladium, gold, iridium, ruthenium, and other corresponding metal-containing anions such as: tungstate, molybdate, vanadate, permanganate, haloaurate, halideplatinate, halidepalladium, etc. The adsorption of anions has not been reported yet

Method used

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  • A heavy metal ion absorbent and application thereof in removal of heavy metal ion
  • A heavy metal ion absorbent and application thereof in removal of heavy metal ion
  • A heavy metal ion absorbent and application thereof in removal of heavy metal ion

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preparation example Construction

[0036] Preparation of magnesium-aluminum binary hydrotalcite roasted product:

[0037] The product magnesium-aluminum binary hydrotalcite obtained after peptization is divided into two parts, and roasted for 2 hours under the temperature conditions set between 400 ° C and 600 ° C, respectively, to obtain two parts of magnesium-aluminum binary hydrotalcite roasting, Grind all the synthesized products through a 160-mesh sieve, and mark the product calcined at 400°C as HT400, and the product calcined at 600°C as HT600, which becomes the heavy metal ion adsorbent.

[0038] 2. With Pb 2+ and Ni 2+ As an example, comparative experiments are used to set forth the best conditions and effects for the application of the heavy metal ion adsorbent of the present invention:

Embodiment a

[0040] Add Ni to 28 Erlenmeyer flasks in 2 groups 2+ , Pb 2+ The initial concentration of the solution is 20, 40, 60, 80, 100, 150, 200mg / L 200ml, the dosage of both HT400 and HT600 is 200mg, and the shaking time is 2 hours. After shaking, suction filtration measures the concentration of heavy metal ions in the filtrate, and obtains the material pair Ni 2+ and Pb 2+ The adsorption effect is shown in accompanying drawing 1 and accompanying drawing 2 respectively. It can be seen from the figure that at each initial concentration, the effect of the two roasted products on Ni 2+ and Pb 2+ The adsorption effect is similar, and the removal rate is higher.

Embodiment b

[0042] Weigh 200mg HT400 and add it into 7 groups of 200ml solutions with a certain concentration of sodium hydroxide or hydrochloric acid solution to adjust the pH value of the solution to be treated to 3, 4, 5, 6, 7, 8, 9. After shaking for 2 hours, micro Pore ​​membrane filtration. At the same time, the parallel experiment of HT600 was done, and the material's effect on Ni 2+ and Pb 2+ The adsorption effect is shown in accompanying drawing 3 and accompanying drawing 4 respectively. It can be seen from the figure that the pH has little effect on the adsorption performance of the hydrotalcite calcined products, and the adsorption effect becomes worse when the pH is greater than 8.

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Abstract

The invention relates to a heavy-metal ion absorber, which is the baked product of binary hydrotalcite, wherein the formula of binary hydrotalcite is A2+(1-x)B3+x(OH)2(CO32+)x / 2 .mH2O, while 0 B01J 20 / 08 C02F 1 / 28 C02F 1 / 62 3 4 1 2006 / 10 / 20 1962046 2007 / 5 / 16 000000000 Shandong University 250061 Su Jixin Zhang Weihong Wang Xiaopeng Yin Jing Qu Wen Pan Qi xude shan 37219

Description

technical field [0001] The invention relates to an ion adsorbent and its application, in particular to a heavy metal ion adsorbent and its application in removing heavy metal ions. Background technique [0002] The harm of heavy metals in water and soil has always been a research topic concerned by the international environmental academic circle. Heavy metals cannot be decomposed in water and soil, and are easy to form a food chain. After entering the human body, heavy metals are easy to cause accumulation and poisoning. Combining with other toxins can produce more toxic organic substances, such as Minamata disease and bone pain disease that shocked the world are caused by mercury and cadmium-containing wastewater pollution. At present, the commonly used methods for removing heavy metals in water are as follows: 1. Neutralization precipitation method; 2. Sulfide precipitation method; 3. Ferrite method; 4. Ion flotation method; 5. Bioflocculation method. These methods all h...

Claims

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Application Information

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IPC IPC(8): B01J20/08C02F1/28C02F1/62
Inventor 苏继新张伟红王晓鹏殷晶屈文潘齐
Owner SHANDONG UNIV
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