Preparation method and application of clinoptilolite-modified water body cadmium adsorbent

An adsorbent, zeolite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of large specific surface area, easy oxidation failure, low adsorption efficiency, etc. Wide range of effects with enhanced adsorption performance

Active Publication Date: 2018-11-30
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coarse powder zeolite is often used as an adsorption material for pollutants in wastewater. Compared with coarse powder, fine powder has a smaller particle size (10-74 microns) and a larger specific surface area. When used as an adsorbent in water treatment, The decontamination effect is higher, but there are defects such as easy agglomeration and easy loss with effluent
[0006] At present, the common cadmium-containing wastewater adsorbents have disadvantages such as easy to produce secondary pollution, easy to oxidize and fail, high cost, and low adsorption efficiency during the application process.

Method used

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  • Preparation method and application of clinoptilolite-modified water body cadmium adsorbent
  • Preparation method and application of clinoptilolite-modified water body cadmium adsorbent
  • Preparation method and application of clinoptilolite-modified water body cadmium adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The natural clinoptilolite is crushed, sieved and ground, and passed through a 1600-mesh sieve to obtain a fine powder zeolite with a particle size of 10-15 μm.

[0034] (2) Carry out high temperature and lanthanum chloride modification to fine powder zeolite, obtain modified fine powder particle size zeolite, specific process is as follows:

[0035] ①Treat the obtained fine powder size zeolite in a muffle furnace at 400°C for 4 hours to remove water molecules in the pores and channels of the fine powder size zeolite, increase the inner surface area and improve the adsorption capacity of the zeolite . Take out the modified fine powder particle size zeolite and put it into a desiccator to cool to room temperature.

[0036] 2. Take the modified fine powder particle size zeolite obtained in step 1 and place it in the NaOH solution of 1.5mol / L (the mass ratio of modified fine powder particle size zeolite to NaOH solution is 1:20), and the rotating speed of the mechanic...

Embodiment 2

[0047] (1) The natural clinoptilolite is crushed, sieved and ground, and passed through a 540-mesh sieve to obtain a fine powder particle size zeolite with a particle size of 10-30 μm.

[0048] (2) Perform high temperature and lanthanum chloride modification on the fine powder particle size zeolite to obtain the modified fine powder particle size zeolite. The specific process is as follows:

[0049] ①Treat the obtained fine powder particle size zeolite in a muffle furnace at 500°C for 3.5 hours to remove water molecules in the pores and channels of the fine powder particle size zeolite, increase the internal surface area and improve the fine powder particle size. Adsorption capacity of particle size zeolites. Take out the modified fine powder particle size zeolite and put it into a desiccator to cool to room temperature.

[0050] 2. Get the modified fine powder particle size zeolite that step 1. obtains and place in the NaOH solution of 2.0mol / L (modified fine powder particl...

Embodiment 3

[0060] (1) The natural clinoptilolite is crushed, sieved and ground, and passed through a 200-mesh sieve to obtain a fine powder particle size zeolite with a particle size of 10-74 μm.

[0061] (2) Carry out high temperature and lanthanum chloride modification to the fine powder particle size zeolite to obtain modified fine powder particle size zeolite, the specific process is as follows:

[0062] ①Treat the obtained fine powder particle size zeolite in a muffle furnace at 600°C for 3 hours to remove water molecules in the pores and channels of the fine powder particle size zeolite, increase the internal surface area and improve the particle size of the fine powder particle size. The adsorption capacity of diameter zeolites. Take out the modified fine powder particle size zeolite and put it into a desiccator to cool to room temperature.

[0063] 2. Get the modified fine powder particle size zeolite obtained in step 1 and place it in the NaOH solution of 2.5mol / L (modified fin...

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Abstract

Provided are a preparation method and application of a zeolite-modified water body cadmium adsorbent. The preparation method comprises the following steps: (1) performing crushing, sieving and grinding on natural clinoptilolite so as to obtain zeolite of a fine powder particle size; (2) performing high temperature and lanthanum chloride modification on the zeolite of the fine powder particle sizeso as to obtain modified zeolite of the fine powder particle size; (3) adopting lignin as a raw material, and preparing nano carbon fiber-coated modified zeolite so as to obtain the zeolite-modified water body cadmium adsorbent. The zeolite-modified water body cadmium adsorbent prepared by using the method is suitable for a cadmium-contaminated natural water body, can be packed in a nylon mesh bagand move in the polluted natural water body, or is filled into an adsorption filler tower or pool, so that the purpose of cadmium removal from wastewater is achieved. The raw materials are cheap andeasily available, and the prepared adsorbent has a wide application range, a good adsorption effect and no secondary pollution, and is especially suitable for emergency treatment of a low-concentration suddenly cadmium-contaminated natural water body or treatment of cadmium-containing wastewater with the concentration of 10-40 mg/L; and the treatment efficiency can reach 95% or above.

Description

technical field [0001] The invention relates to a preparation method and application of an adsorbent for removing cadmium in cadmium-polluted water, and belongs to the technical field of water heavy metal pollution control. Background technique [0002] With the development of metallurgy, mining, plastics and other industries, cadmium is used as a raw material for the production of batteries, plastics, alloys, etc. The wide application of cadmium has increased the discharge of waste water containing waste. Cadmium is not an essential element for the human body and is carcinogenic to the human body. It can accumulate in the human body through the food chain and damage the liver, cardiovascular system, immune system and reproductive system. Therefore, water body cadmium pollution treatment technology has always been a research hotspot for environmental protection workers. [0003] Conventional cadmium-containing wastewater and water treatment technologies can be roughly divid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/0222B01J20/0288B01J20/12B01J20/20C02F1/288C02F2101/20C02F2101/22
Inventor 张彦浩王宇辰张志斌曹国勋夏四清林建伟张向阳孙翠珍
Owner SHANDONG JIANZHU UNIV
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