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A kind of preparation method and application of chromium adsorbent

An adsorbent and adsorption treatment technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of numerous operation steps, high preparation cost, and long time-consuming, and achieve wide source and selection High reliability and time-saving effect

Active Publication Date: 2019-07-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some silicon material adsorbents have a high adsorption capacity for chromium, operations such as roasting, reflux, long-term aging, and multiple functionalizations are required in the preparation process, and there are defects such as long time-consuming, numerous operation steps, and high preparation costs.

Method used

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  • A kind of preparation method and application of chromium adsorbent
  • A kind of preparation method and application of chromium adsorbent
  • A kind of preparation method and application of chromium adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Use fly ash as raw material, mix and grind it with sodium hydroxide at a mass ratio of 1:0.8, then roast at 400°C for 6 hours to obtain an activated silicon source, then mix and stir the activated silicon source and water at a mass ratio of 1:3, Obtain the supernatant by filtration; use hexadecyltrimethylammonium bromide as the template, dissolve the template in water, add the supernatant as the silicon-aluminum source, and the mass ratio of the template to the supernatant is 1:10 , add hydrochloric acid and stir to adjust pH = 9, filter, wash with water until there is no foam, dry, and the obtained mesoporous organic-inorganic composite material is the chromium adsorbent.

[0026] The prepared chromium adsorbent is used to adsorb Cr(VI) in chromium-containing wastewater, and the adsorption effect of the adsorbent on Cr(VI) in different concentrations of chromium-containing wastewater is as follows: image 3 Shown: At initial Cr(VI) concentration C Cr(VI) =25mg / L, 50mg...

Embodiment 2

[0032] Use microsilica powder as raw material, mix and grind with potassium hydroxide at a mass ratio of 1:1, then roast at 450°C for 5 hours to obtain an activated silicon source, then mix and stir the activated silicon source and water at a mass ratio of 1:4, Obtain the supernatant by filtration; use hexadecyltrimethylammonium bromide as the template, dissolve the template in water, add the supernatant as the silicon-aluminum source, and the mass ratio of the template to the supernatant is 1:15 , add nitric acid and stir to adjust the pH=10, filter, wash with water until there is no foam, dry, and the obtained mesoporous organic-inorganic composite material is the chromium adsorbent.

[0033] The prepared adsorbent is used to adsorb Cr(VI) in chromium-containing wastewater, and it can be calculated by Langmuir model. The monolayer saturated adsorption capacity of the prepared adsorbent for Cr(VI) is 232mg / g.

Embodiment 3

[0035] Use rice husk ash as raw material, mix and grind it with sodium hydroxide at a mass ratio of 1:1.2, then roast at 500°C for 4 hours to obtain an activated silicon source, then mix and stir the activated silicon source and water at a mass ratio of 1:5, Obtain the supernatant by filtration; use hexadecyltrimethylammonium bromide as the template, dissolve the template in water, add the supernatant as the silicon-aluminum source, and the mass ratio of the template to the supernatant is 1:18 , add sulfuric acid and stir to adjust the pH=11, filter, wash with water until there is no foam, dry, and the obtained mesoporous organic-inorganic composite material is the chromium adsorbent.

[0036] The prepared adsorbent is used to adsorb Cr(VI) in chromium-containing wastewater, and it can be calculated by Langmuir model. The monolayer saturated adsorption capacity of the prepared adsorbent for Cr(VI) is 198 mg / g.

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Abstract

The invention discloses a preparation method and application of a chromium adsorbent. The preparation method comprises the following steps: taking fly ash, silica fume, rice hull ash, diatomite and other industrial / agricultural waste as raw materials, performing mixed grinding and roasting with alkali, mixing with water, and filtering to obtain a supernate; and mixing the supernate with a template agent, regulating the pH value, and quickly synthesizing an organic-inorganic composite material at room temperature, wherein the organic-inorganic composite material is the chromium adsorbent. The prepared chromium adsorbent is used for performing adsorption treatment on Cr(VI) in chromium-containing wastewater. The method disclosed by the invention is simple and time-saving, and has high chromium adsorption capacity and high chromium adsorption selectivity, thereby having favorable application prospects.

Description

technical field [0001] The invention relates to a preparation method and application of a chromium adsorbent, belonging to the field of resource disposal of industrial and agricultural waste and environmental protection. Background technique [0002] my country's water is seriously polluted by heavy metals, and chromium-containing wastewater is one of them, which comes from a wide range of sources, such as chromium industry, mining, printing and dyeing, papermaking, and electroplating. There are two relatively stable forms of chromium: trivalent chromium and hexavalent chromium. Among them, trivalent chromium has low solubility and low toxicity, while hexavalent chromium has high solubility, strong oxidizing property and high toxicity, and it is mainly processed for hexavalent chromium. . Chromium pollution incidents have occurred in many places in recent years, such as chromium pollution in Nanpanjiang, Yunnan in 2011, Qujing in Yunnan, Yima in Henan, Liuzhou in Guangxi, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/22B01J20/28054C02F1/288C02F2101/22
Inventor 罗永明张黎明何昱轩陈定凯韩彩芸何德东
Owner KUNMING UNIV OF SCI & TECH