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Preparation method of inorganic-organic compound-type adsorbent based on clinoptilolite and application for removing Cr(VI) in industrial waste water

A technology for industrial wastewater and adsorbents, applied in the fields of adsorbed water/sewage treatment, inorganic chemistry, chemical instruments and methods, etc., can solve the problem of inability to remove anionic pollutants, and achieve the effects of abundant reserves, increased adsorption capacity and low cost

Inactive Publication Date: 2010-08-11
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong hydrophilicity of the silicon-oxygen structure on the surface of zeolite, the hydrolysis of cations outside the structure, and the negative charge of the silicon-oxygen structure itself, general natural stones cannot remove anionic pollutants in water.

Method used

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  • Preparation method of inorganic-organic compound-type adsorbent based on clinoptilolite and application for removing Cr(VI) in industrial waste water
  • Preparation method of inorganic-organic compound-type adsorbent based on clinoptilolite and application for removing Cr(VI) in industrial waste water
  • Preparation method of inorganic-organic compound-type adsorbent based on clinoptilolite and application for removing Cr(VI) in industrial waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Preparation of inorganic-organic composite adsorbent (see figure 2 ): Place 100g of cleaned 80-100 mesh natural clinoptilolite in 500ml of sodium chloride solution with a concentration of 2mol / L, heat for 2.0h at 2 atmospheric pressure and 110-120°C, and wait for complete cooling Filter, wash 3 times with deionized water, and dry at 80°C. Put the humic acid in a muffle furnace, roast it at 350°C for 1.0h, and then soak it in 2.0mol / L ferric chloride solution for 1.5h to obtain insoluble iron-type humic acid. After grinding, use 1mol / L hydrochloric acid solution and hot deionized water for repeated washing, and then repeated washing with 1.0-2.0mol / L sodium chloride solution and deionized water to convert humic acid into insoluble sodium humic acid. Sodium chloride modified clinoptilolite and insoluble humic acid are formulated into a mixture with a mass ratio of 10:1, and chitosan with a deacetylation degree of 90% is slowly dissolved with a concentration of 2% aceti...

Embodiment 2

[0023] Preparation of inorganic-organic composite adsorbent: the difference between this embodiment and Example 1 is the mass ratio used when sodium chloride-modified clinoptilolite and insoluble humic acid are formulated into a mixture in the preparation of inorganic-organic composite adsorbent 5:1. Other steps and parameters are the same as in Example 1.

[0024]The inorganic-organic composite adsorbent prepared by the above method contains Cr(VI) wastewater: the treated wastewater in Example 2 is the high-concentration wastewater of 100mg / L Cr(VI) concentration prepared in the laboratory, and the wastewater is adjusted The pH value is 3, then add inorganic-organic composite adsorbent to the wastewater at 5mg / L, stir with compressed air, after 30min of adsorption, settle for 1h, the supernatant is introduced into the second stage of adsorption, and the second stage of adsorption into the wastewater The dosage of adding inorganic-organic composite adsorption is 1mg / L, and ot...

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Abstract

The invention belongs to the technical field of waste water processing. An inorganic-organic compound-type adsorbent is prepared by compositing three natural materials of natural clinoptilolite, humic acid and chitosan. The method comprises the following specific steps of: performing pre-activation modification on the natural clinoptilolite, performing insolubility processing on humic acid, sufficiently mixing the processed clinoptilolite, insoluble humic acid and acidic chitosan solution according to a certain proportion, heating and drying through microwave, grinding and screening to prepare the inorganic-organic compound-type adsorbent with a loose porous structure, high surface activity and high ion exchanging performance. The prepared adsorbent is used for processing the industrial waste water with the concentration of Cr(VI) lower than 100mg / L, wherein the concentration of effluent Cr(VI) is lower than 0.5mg / L, which meets the requirement of the maximum permissible discharge concentration of the first type of pollutant in the national waste water comprehensive discharge standard. The method has easily obtained materials, simple processing technique and high processing efficiency, and is suitable for large-scale production.

Description

technical field [0001] The inorganic-organic composite adsorbent of the present invention and its application belong to the technical field of wastewater treatment, and specifically relate to a preparation method of a novel inorganic-organic composite adsorbent based on clinoptilolite, and the removal of Cr(VI) in industrial wastewater Applications. Background technique [0002] Chromium-containing wastewater mainly comes from processes such as tanning, electroplating and chromium salt production. In water, chromium mainly exists in the form of Cr(III) and Cr(VI), among which Cr(VI) is very toxic, about 100 times that of Cr(III). my country stipulates that the maximum allowable concentration of Cr(III) and Cr(VI) in surface water is 0.5 and 0.1mg / L respectively; the maximum allowable concentration of Cr(VI) in drinking water is 0.05mg / L. Treatment methods for Cr(VI)-containing wastewater include chemical reduction precipitation, adsorption, ion exchange, electrolysis, memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/16B01J20/32C02F1/28C02F1/62
Inventor 张盼月张光明吴珍方金鹏
Owner BEIJING FORESTRY UNIVERSITY
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