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Novel sodium bentonite-AM-AA composite lead ion absorbing agent

A technology of sodium-based bentonite and calcium-based bentonite, applied in the field of water treatment, can solve the problems of high cost of composite bentonite and high cost of organic monomers, and achieve the effects of easy recycling, short preparation period and low energy consumption

Inactive Publication Date: 2012-07-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of organic monomers, when the bentonite content in the composite bentonite is low, the cost of the composite bentonite is also high

Method used

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  • Novel sodium bentonite-AM-AA composite lead ion absorbing agent
  • Novel sodium bentonite-AM-AA composite lead ion absorbing agent
  • Novel sodium bentonite-AM-AA composite lead ion absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The first step, the preparation of purified calcium-based bentonite

[0034] Calcium-based bentonite slag powder and tap water are added according to the mass ratio of calcium-based bentonite slag powder: tap water=1: 6, stirred for 30 minutes, allowed to stand for 24 hours, then stirred for 15 minutes, and then tap water is added to prepare a mass ratio of calcium-based bentonite slag powder : the feed liquid of water=1: 10, continue to stir 15min, then let stand and settle for 4h, take out the supernatant and be used for preparing feed liquid again next time, take out the fine soil of the upper layer from the sediment, discard the sand grains of the lower layer, the The refined soil is dried in an oven at a temperature of 100°C until the quality of the refined soil remains unchanged, then crushed, and passed through a 200-mesh sieve to obtain purified calcium-based bentonite;

[0035] The second step, solution polymerization

[0036]First, weigh 8.5 g of the purified...

Embodiment 2

[0043] The first step, the preparation of purified calcium-based bentonite

[0044] Will leave standstill 24h, the tap water that adds again after stirring 15min is changed into the supernatant that this step takes out in embodiment 1, and other steps are with the first step of embodiment 1;

[0045] The second step, solution polymerization

[0046] First, weigh 8.5g of purified calcium-based bentonite and 0.425g of sodium carbonate sodium carbonate and dissolve them in 55mL of deionized water. After mixing evenly, stir in a water bath at 70°C for 15 minutes for sodiumization. After the sodiumization is complete, let it stand at room temperature. Then, add 1.125 g of acrylamide and 0.375 g of acrylic acid and stir at room temperature for 60 minutes, mix well and then heat up to 70°C, then add 0.01 g of initiator potassium persulfate-sodium sulfite and 0.2 g of crosslinking agent N, N-methylenebisacrylamide g, continue to stir and carry out polymerization reaction for 80 minut...

Embodiment 3

[0051] The first step, the preparation of purified calcium-based bentonite

[0052] With the first step of embodiment 1;

[0053] The second step, solution polymerization

[0054] First, weigh 8.5 g of purified calcium-based bentonite and 0.425 g of sodium carbonate sodium carbonate and dissolve them in 40 mL of deionized water. After mixing evenly, stir in a water bath at 70°C for 15 minutes for sodiumization. After the sodiumization is complete, let it stand at room temperature. Then, add 1.0 g of acrylamide and 0.5 g of acrylic acid and stir at room temperature for 60 minutes, mix well and heat up to 70°C, then add 0.01 g of initiator potassium persulfate-sodium sulfite and 0.2 g of crosslinking agent N, N-methylenebisacrylamide g, continue to stir and carry out polymerization reaction for 80 minutes to obtain a wet solid phase product.

[0055] The third step is to dry the obtained composite bentonite product

[0056] The wet solid phase product obtained in the second s...

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Abstract

The invention relates to a novel sodium bentonite-AM-AA composite lead ion absorbing agent which belongs to the technical field of water treatment. The novel sodium bentonite-AM-AA composite lead ion absorbing agent comprises sodium bentonite obtained subjecting sodium treatment to calcium bentonite and a material A polymerized on the sodium bentonite, wherein the material A accounts for 11-17 percent by mass of the total mass, the sodium bentonite accounts for 83-89 percent by mass of the total mass, the material A is generated by monomer acrylamide and crylic acid and a crosslinking agent for solution polymerization under the action of an initiator. The invention overcomes the problems of large swelling property, difficulty in solid-liquid separation and the like of the bentonite, and realizes final synthesis continuous operation of the sodium treatment of the calcium bentonite to the novel sodium bentonite-AM-AA composite lead ion absorbing agent; and the novel sodium bentonite-AM-AA composite lead ion absorbing agent has less synthesis steps in the whole preparation process, is safe in operation, has lower cost and lead absorbing performance of reaching 157.5mg / g.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a sodium bentonite-AM-AA composite novel lead ion adsorbent and a preparation method thereof. Background technique [0002] Lead toxicity is persistent and highly accumulative. Nearly half of the world's lead is used to make batteries. The rest is used in gasoline anti-knock agents, construction materials, cables and explosives, etc. But only a quarter of lead is recycled. The vast majority of lead is discharged in the form of waste gas, waste residue, waste water, etc., causing large-scale lead pollution. Lead enters the human body directly through the human respiratory system, digestive system or skin, and has been deposited in the body, causing certain damage to almost all tissues and organs of the human body. Even if the blood lead level in the body is significantly reduced after getting out of the polluted environment or after treatment, the damaged organs and ti...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 曹吉林冯天水陈学青赵斌
Owner HEBEI UNIV OF TECH
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