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A method and application of preparing heavy metal chromium adsorbent by dredging sediment of Dianchi Lake

A technology for dredging sediment and heavy metals, applied in the directions of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., to achieve the effects of high product yield, increased adsorption capacity, and simple operating conditions

Active Publication Date: 2021-12-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, no research has reported the use of cetyltrimethylammonium bromide (CTMAB) to modify the bottom sediment of Dianchi Lake for the adsorption of heavy metal chromium.

Method used

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  • A method and application of preparing heavy metal chromium adsorbent by dredging sediment of Dianchi Lake

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A method of preparing a metal chromium adsorbent using Dianchi dredged slot, the specific steps are as follows:

[0021] (1) Wash the dredging of the dodge dredging in the removal impurity to wash to neutral, solid-liquid separation, solids at a temperature of 60 ° C under conditions, temperature treatment 24 h and ground to a particle size of 160 to 180 mesh, resulting in pretreatment Dredging of the slurry;

[0022] (2) Salvation of hexadalkyltrimel bromide was prepared into an organic modified solution in deionized water; therein in the organic modified solution of hexamethyltrimethylammonium concentration was 0.01 g / mL;

[0023] (3) The pretreatment dredging of step (1) is added to the organic modified solution of step (2) for 2.0 h, and the pressure is filtered under reduced pressure to obtain a solid, washed with distilled water to neutral, and the solid is placed at a temperature of 60. The constant temperature treatment under ° C was treated with 12 h a...

Embodiment 2

[0026] Example 2: A method of preparing a metallic chromic adsorbent using Dianchi Dredging Terminal, the specific steps are as follows:

[0027] (1) Wash the dredging of the diolite dredging joint to remove impurities to the neutralized water, solid-liquid separation, the solid is placed under temperature of 80 ° C for 18 h and ground to the particle size of 180 to 190 to obtain pre-treatment dredging Undermoth;

[0028] (2) Salvation of hexadalkyltrimethylammonium bromide was formed into an organic modified solution in deionized water; wherein the concentration of adjacent ammonium trimethyl bromide in an organic modified solution was 0.02 g / ml;

[0029] (3) The pretreatment dredging of step (1) is added to the organic modified solution of step (2) to treat 0.5 h, and the decompression is filtered to obtain a solid, washed to neutral with distilled water, and the solid is placed at a temperature of 75. The constant temperature treatment under ° C for 18 h and ground 180 mesh s...

Embodiment 3

[0031] Example 3: A method of preparing a metal chromium adsorbent using Dianchi Dredged Terminal, the specific steps are as follows:

[0032] (1) Wash the dredging of the dioli dredging in the removal impurity to wash to neutral, solid-liquid separation, the solid is placed at a temperature of 90 ° C under conditions, and the particle size is 190 ~ 200 to obtain pretreatment dredging Undermoth;

[0033] (2) Salvation of hexadalkyltrimethylammonium bromide was prepared into an organic modified solution in deionized water; wherein the concentration of adjacent ammonium trimethyl bromide in an organic modified solution was 0.03 g / mL;

[0034] (3) The pretreatment dredging of step (1) is added to the organic modified solution of step (2) for 1.0 h, and the pressure is filtered under reduced pressure to obtain a solid, and the solid is washed to neutral, the solid is placed at a temperature of 90. The constant temperature treatment is 24 h under ° C and ground 200 mesh sieve to obta...

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Abstract

The invention discloses a method and application for preparing a heavy metal chromium adsorbent by using the dredged bottom mud of Dianchi Lake, and belongs to the technical field of heavy metal adsorbents. In the present invention, the Dianchi Lake dredged sediment from which impurities have been removed is washed with deionized water until neutral, solid-liquid is separated, and the solid is placed at a temperature of 60-90°C for constant temperature treatment for 12-24 hours and ground to a particle size of 160-200 mesh to obtain Pretreatment of dredged sediment; adding the pretreated dredged sediment to cetyltrimethylammonium bromide organic modification solution for modification to obtain the heavy metal chromium adsorbent. The method of the invention can change the surface electrical properties of the dredged bottom mud of the Dianchi Lake, increase the adsorption capacity for the heavy metal chromium, and the preparation method can not only recycle the dredged bottom mud of the Dianchi Lake, but also reduce the cost of treating chromium-containing wastewater.

Description

Technical field [0001] The present invention relates to a method and application of a metallic chromic adsorbent by Dianchi dredging joint, which belongs to heavy metal chromium adsorbent technology. Background technique [0002] Dianchi dredging sediment is different from other solid waste, which has the following main characteristics: (1) Side mud nutritional salt pollution: Dianchi is a slow lake in the lake, the content of nitrogen and phosphorus salt in the bottom of the lake. Comparison High, the total nitrogen content of 0.62 ~ 2.42%, the total phosphorus content is 0.04 ~ 0.40%; (2) microorganisms, high pathogens content, Dianchi bottom mud contains a variety of pathogenic bacteria, viruses, parasitic eggs and Harmful incta eggs, non-processing, direct administration or disposal, may pollute the food chain; (3) high content, easy to corrupt stink, malodic contamination environment, simultaneously discharge greenhouse gas to the atmosphere. [0003] At present, Dianchi dre...

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
Inventor 杨月红蒋爱丽王斌
Owner KUNMING UNIV OF SCI & TECH
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