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Synthetic method of pentavalent arsenic p-type zeolite adsorbent

A synthesis method and adsorbent technology are applied in the field of synthesis of pentavalent arsenic p-type zeolite adsorbent, which can solve the problems of poor zeolite ion exchange capacity, low fly ash conversion rate and zeolite yield, long synthesis period, and the like. The effect of solving pollution problems, shortening crystallization time, and low cost

Active Publication Date: 2018-12-07
KUNMING UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, their synthetic objects are all high-aluminum fly ash, the conversion rate of fly ash and the yield of zeolite are still low, the ion exchange capacity of the obtained zeolite is poor, the synthesis period is long, and some aluminum that is beneficial to the adsorption of arsenic will be released with filtrate flow out

Method used

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preparation example Construction

[0030] The invention provides a method for synthesizing pentavalent arsenic (As(V)) adsorbent P-type zeolite, which comprises mixing fly ash with low aluminum content and sodium hydroxide particles and grinding them evenly, ultrasonicating; taking out the mixture and grinding it and placing it side by side Add deionized water and sodium aluminate to the liner of the polytetrafluoroethylene reactor, stir, and mix thoroughly; after the suspension is left to stand, put the liner in an electric thermostat for hydrothermal reaction; take out the reactor After natural cooling to room temperature, the solid product is obtained by filtration, washed with deionized water, and dried to obtain p-type zeolite as a pentavalent arsenic (As(V)) adsorbent. The specific process such as figure 1 shown, including the following steps:

[0031] S101: Mix low-aluminum fly ash and sodium hydroxide particles at a mass ratio of 1:1.2 and grind them evenly;

[0032] S102: Grind and place in the liner...

Embodiment 1

[0037] Mix 5g of fly ash and 6g of sodium hydroxide particles and grind them evenly, grind them and place them in the liner of a polytetrafluoroethylene reactor, add 40mL of deionized water and 0.0095-0.038mol of sodium aluminate, and stir for 5 minutes to make Mix well, sonicate for 10 minutes, and conduct hydrothermal reaction at 90°C for 6 hours. Then filter to obtain a solid product, wash the solid product with deionized water, and dry it to obtain the P-type zeolite. The powder X-ray diffraction (XRD) of the product is as figure 2 As shown, a, b, and c are 0.0095mol, 0.019mol, and 0.038mol of sodium aluminate respectively. When the amount of sodium aluminate is 0.038mol, the peak of zeolite is more obvious than the other two, and c is at 2θ: 14.03°, 24.56°, 31.82. There are peaks at a and b, and the 0.038mol synthesized zeolite has relatively more peaks.

Embodiment 2

[0039] Mix 5g of fly ash and 6g of sodium hydroxide particles and grind them evenly, grind them and place them in the liner of a polytetrafluoroethylene reactor, add 40mL of deionized water and 0.038mol of sodium aluminate, stir for 5min to make it fully Mix, sonicate for 30 minutes, and conduct hydrothermal reaction at 90°C for 6h. Then filter to obtain a solid product, wash the solid product with deionized water, and dry. The powder X-ray diffraction (XRD) of the product is as image 3 As shown, there is no P-type zeolite, probably because the sonication time is too short.

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Abstract

The invention discloses a synthetic method of a pentavalent arsenic p-type zeolite adsorbent. The synthetic method comprises the steps of mixing and uniformly grinding low-aluminum-content coal ash and sodium hydroxide particles, carrying out ultrasonic treatment, taking out the treated mixture and grinding the same, putting the mixture into an inner container of a polytetrafluoroethylene reactionkettle, adding deionized water and sodium aluminate, stirring, adequately mixing, carrying out standing on suspension liquid, putting the inner container into an electric heating incubator to carry out hydrothermal reaction, taking out the reaction kettle, naturally cooling down to the room temperature, filtering to obtain a solid product, flushing the solid product through deionized water, and drying, so as to obtain the pentavalent arsenic (As(V)) p-type zeolite adsorbent. According to the synthetic method, the adopted raw material is low-aluminum coal ash, which is a byproduct produced after the combustion of coal and contains a large number of silica and alumina, and meanwhile, the coal ash is used for being synthesized into zeolite, so that the pollution problem caused by the coal ash is solved, and the waste is turned into wealth.

Description

technical field [0001] The invention belongs to the technical field of adsorbent material preparation, and in particular relates to a synthesis method of a pentavalent arsenic p-type zeolite adsorbent. Background technique [0002] Arsenic is a highly toxic metalloid element, and groundwater containing arsenic (>10 μg / L) is an environmental problem that needs to be solved worldwide. It can enter water bodies through natural effects and some human activities. This will seriously threaten the water environment on which humans and animals depend. At present, arsenic poisoning incidents have occurred in Australia, Canada, the United States, Japan, Argentina and other countries, and my country has also become a country with serious arsenic pollution in recent years. Drinking high-arsenic water for a long time can cause cancer and other diseases. How to efficiently remove arsenic in groundwater has become a research hotspot and difficulty in the field of environment. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46B01J20/18
CPCB01J20/18C01B39/46C01P2002/72
Inventor 韩彩芸阳婷刘航罗永明
Owner KUNMING UNIV OF SCI & TECH
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