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Preparation method and application of wastewater chromium PEI/ZSM-5 (polyethyleneimine/zeolite socony mobil-5) modified absorbent

A technology of ZSM-5 and adsorbent, which is applied in the field of adsorbent preparation, can solve the problems such as the large influence of ZSM-5 adsorption capacity, and achieve the effects of low cost, good application prospect and simple preparation method

Active Publication Date: 2017-12-01
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the difference in loading of polyethyleneimine has a great influence on the adsorption capacity of ZSM-5 after modification, which is not reflected in this patent

Method used

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  • Preparation method and application of wastewater chromium PEI/ZSM-5 (polyethyleneimine/zeolite socony mobil-5) modified absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of chromium adsorbent:

[0037] (a) Acid modification of ZSM-5 molecular sieve: Grind the commercially available ZSM-5 molecule (silicon-aluminum ratio is 38) to 100 mesh, according to the solid-liquid ratio of ZSM-5 and methanol 1:10 (g:mL) ZSM-5 was dissolved, sonicated under ultrasonic conditions for 15 minutes, vacuum filtered and dried at 100°C for 2 hours after standing still. Put the dried sample in a beaker, add dilute hydrochloric acid so that the solid-liquid ratio of ZSM-5 and dilute hydrochloric acid is 1:5 (g:mL), sonicate under ultrasonic conditions for 15min, vacuum filter and dry at 110°C After 2 hours, grind to 100 mesh to obtain the acid-modified ZSM-5 molecular sieve.

[0038] (b) Dissolve PEI (molecular weight: 600) in methanol according to the ratio of PEI to methanol 1:10 (g:mL), sonicate under ultrasonic conditions for 15 minutes, add 1.5g of acid-modified ZSM-5 to the above PEI / methanol solution, sonicated for 15min, dried at 110°C...

Embodiment 2

[0042] Preparation of chromium adsorbent:

[0043] (a) Acid modification of ZSM-5 molecular sieve: Grinding commercially available ZSM-5 (silicon-aluminum ratio 60) to 100 mesh, according to the solid-liquid ratio of ZSM-5 and methanol 1:5 (g:mL) -5 was dissolved, sonicated under ultrasonic conditions for 15 minutes, vacuum filtered and dried at 90°C for 2 hours after standing still. Put the dried sample in a beaker, add hydrochloric acid so that the solid-to-liquid ratio of ZSM-5 and dilute hydrochloric acid is 2:5 (g:mL), sonicate under ultrasonic conditions for 15min, vacuum filter and dry at 100°C for 2h , Grind to 100 meshes to obtain the acid-modified ZSM-5 molecular sieve.

[0044](b) Dissolve PEI (molecular weight 1800) in methanol according to the ratio of PEI to methanol at 1:5 (g:mL), sonicate under ultrasonic conditions for 15 minutes, add 1.5 g of acid-modified ZSM-5 molecular sieve to the above PEI / methanol solution, sonicated for 15min, dried at 100°C for 2h, ...

Embodiment 3

[0048] Preparation of chromium adsorbent:

[0049] (a) Acid modification of ZSM-5 molecular sieve: Grinding the commercially available ZSM-5 molecular sieve (silicon-aluminum ratio of 120) to 100 mesh, according to the solid-liquid ratio of ZSM-5 and methanol 3:10 (g:mL) ZSM-5 was dissolved, sonicated under ultrasonic conditions for 15 minutes, vacuum filtered and dried at 100°C for 2 hours after standing still. Put the dried sample in a beaker, add hydrochloric acid so that the solid-liquid ratio of ZSM-5 and dilute hydrochloric acid is 1:5 (g:mL), sonicate under ultrasonic conditions for 15min, vacuum filter and dry at 100°C for 2h , Grind to 100 meshes to obtain the acid-modified ZSM-5 molecular sieve.

[0050] (b) Dissolve PEI (molecular weight 3000) in methanol according to the ratio of PEI to methanol at 1:10 (g:mL), sonicate under ultrasonic conditions for 15 minutes, add 1.5 g of acid-modified ZSM-5 molecular sieve to the above PEI / methanol solution, sonicated for 15...

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Abstract

The invention belongs to the technical field of water treatment and particularly discloses a preparation method and application of a wastewater chromium PEI / ZSM-5 modified absorbent. The wastewater chromium PEI / ZSM-5 modified absorbent is prepared by modifying ZSM-5 through PEI of different molecular weights, specifically, the acid-modified ZSM-5 serves as the substrate of the absorbent, the PEI serves as modifying materials to load the PEI onto the surface of a ZSM-5 molecular sieves according to different mass fractions, and then high-temperature drying treatment is performed to obtain the wastewater chromium PEI / ZSM-5 modified absorbent. The wastewater chromium PEI / ZSM-5 modified absorbent can be in full contact with reaction liquid to achieve relatively high absorbing performance and to effectively remove hexavalent chromium in wastewater. Meanwhile, the preparation of the wastewater chromium PEI / ZSM-5 modified absorbent is simple, easily obtainable in conditions, short in time consumption and applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method and application of an adsorbent for removing Cr(VI) in waste water. Background technique [0002] Chromium exists mainly in trivalent and hexavalent forms in nature. Among them, the compound of Cr(VI) cannot be degraded naturally, it will accumulate in organisms and human body, it is highly carcinogenic and oxidative, and its toxicity is more than 100 times that of Cr(III). The migration and transformation modes of chromium in water mainly include adsorption, hydrolysis, precipitation, complexation and redox. There are many existing methods for removing heavy metal ions, including chemical precipitation, adsorption, ion exchange, and biological methods. The adsorption method mainly uses insoluble solid materials with high specific surface area as adsorbents, and uses mechanisms such as physical adsorption and chemical adsorption to adsor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/32C02F1/28C02F101/22
CPCB01J20/186B01J20/262B01J20/3272C02F1/288C02F2101/22
Inventor 李再兴贾秀秀牛建瑞钟为章李贵霞周蕾佟雪娇
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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