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Method for removal of crystal violet dye in water with water hyacinth based hydrothermal carbon adsorbent

A technology of hydrothermal charcoal and water hyacinth, which is applied in the direction of adsorption of water/sewage treatment, water pollutants, water/sewage treatment, etc. It can solve the problems of flooding water hyacinth, affecting the safety of drinking water for humans and animals, and costing huge sums of money. , to achieve the effect of realizing resource utilization, realizing water environment protection and reducing environmental load

Active Publication Date: 2018-06-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water hyacinth was once introduced by many countries and widely distributed all over the world. Although water hyacinth itself has a strong ability to purify sewage, water hyacinth reproduces very fast and consumes a lot of dissolved oxygen when growing. A large number of water hyacinths cover the river surface. It is easy to cause deterioration of water quality and affect the growth of underwater organisms
At the same time, water hyacinth can absorb heavy metals and other toxic substances, causing secondary pollution to water bodies after death, affecting the safety of drinking water for humans and animals
Famous water bodies such as Dianchi Lake, Taihu Lake, Huangpu River, and Wuhan East Lake have all experienced flooding of water hyacinths, and it is impossible to cure them with a huge amount of money.
Biomass hydrothermal carbonization treatment can easily destroy microbial cells and hydrolyze organic matter in water hyacinth. With the increase of hydrothermal reaction temperature and pressure, the collision between particles increases and the colloidal mechanism is destroyed.

Method used

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  • Method for removal of crystal violet dye in water with water hyacinth based hydrothermal carbon adsorbent
  • Method for removal of crystal violet dye in water with water hyacinth based hydrothermal carbon adsorbent
  • Method for removal of crystal violet dye in water with water hyacinth based hydrothermal carbon adsorbent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1: Stir the water hyacinth into a muddy state, react at 200°C for 3 hours, take out the product and centrifuge to separate the solid from the liquid, wash it several times with water, take out the solid and dry it at 105°C for 24 hours to obtain No. 1 water hyacinth based hydrothermal carbon adsorbent.

[0021] Take No. 1 water hyacinth-based hydrothermal carbon adsorbent and add it to the crystal violet dye water with an initial concentration of 150mg / L. The dosage of the adsorbent is 0.8, 1.0, 1.2, 1.4, 1.6g / L respectively, that is, 25ml crystal violet solution Corresponding to 0.02, 0.025, 0.03, 0.035, 0.04g of adsorbent respectively, shake and adsorb at 20°C for 24 hours, and centrifuge to separate solid and liquid. Collect the liquid into the waste container for unified disposal.

[0022] The effect of adsorbent dosage on the removal of crystal violet is as follows: figure 1 shown.

example 2

[0023] Example 2: Stir the water hyacinth into a muddy state, react at 180°C for 5 hours, take out the product and centrifuge to separate the solid from the liquid, then wash it several times with water, take out the solid and dry it at 105°C for 24 hours to obtain No. 2 water hyacinth based hydrothermal carbon adsorbent.

[0024] Take No. 2 water hyacinth-based hydrothermal carbon adsorbent and add it to crystal violet dye water with an initial concentration of 100, 150, 200, 250, 300, and 350mg / L. The dosage of the adsorbent is 1.6g / L, that is, 25ml of crystal violet The solution corresponds to 0.04g of adsorbent, which is shaken and adsorbed at 15°C for 24 hours, and centrifuged to separate the solid from the liquid. Collect the liquid into the waste container for unified disposal.

[0025] The effect of the initial concentration of crystal violet on the removal effect of crystal violet is as follows: figure 2 shown.

example 3

[0026] Example 3: Stir the water hyacinth into a muddy state, react at 200°C for 4 hours, take out the product and centrifuge to separate the solid from the liquid, wash it several times with water, take out the solid and dry it at 105°C for 24 hours to obtain No. 3 water hyacinth based hydrothermal carbon adsorbent.

[0027] The scanning electron microscope picture of water hyacinth base hydrothermal carbon of the present embodiment is as follows image 3 It can be seen from the figure that the shape of water hyacinth biochar is similar to loose cotton-like flocs, and its surface is uneven, uneven, and very rough, which is conducive to the adsorption of pollutants by adsorbents.

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Abstract

Belonging to the water treatment field, the invention relates to a method for removal of crystal violet dye in water with a water hyacinth based hydrothermal carbon adsorbent. The method includes thesteps of: making water hyacinth into a muddy state, putting the water hyacinth mud into a reaction kettle, introducing nitrogen into the reaction kettle to form an oxygen-free environment in the kettle body, carrying out reaction in the reaction kettle for 2.5-6h at 180-220DEG C to generate water hyacinth based hydrothermal carbon, performing centrifugation, and conducting washing with water several times, and conducting drying, grinding and sieving to 350-850microm, thus obtaining an adsorbent; adding the adsorbent into a crystal violet solution with an initial concentration of 100-400mg / L, conducting oscillation adsorption for 20-24h under the condition of 10-30DEG C, and conducting centrifugation for solid-liquid separation. Specifically, the adding amount of the water hyacinth based hydrothermal carbon adsorbent is 0.8-1.6g / L. The method provided by the invention not only can alleviate the pollution caused by overgrowth of water hyacinth to the environment, but also can turn wasteinto wealth, remove crystal violet dye in water, achieve waste control by waste, and realize effective utilization of sludge resources and water environment protection.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing crystal violet dye in water by using water hyacinth hydrothermal carbon adsorbent. Background technique [0002] my country is a big country in textile printing and dyeing. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in my country is (300-400)×10 4 t, is one of the major polluters in the industry. Compared with developed countries, the water consumption per unit of my country's textile printing and dyeing industry is 2 to 3 times that of developed countries, and the total amount of pollutant discharge per unit is 1.2 to 1.8 times that of developed countries. Compared with other industries, the textile printing and dyeing industry not only consumes a lot of water, but also pollutes seriously. [0003] Crystal violet, also known as violet, is currently the most widely used synthetic basic dye,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/20B01J20/30C02F103/30C02F101/32
CPCB01J20/20B01J2220/4843C02F1/283C02F2101/308C02F2101/32C02F2103/30
Inventor 魏佳朱雨寒刘亦陶
Owner BEIJING UNIV OF TECH
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