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Preparation method and application of a kind of citric acid modified rape straw adsorbent

A technology of rape straw and citric acid, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, to achieve the effects of wide sources, good treatment effect and low treatment cost

Active Publication Date: 2011-12-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the application of citric acid modified rape straw as an adsorbent for wastewater treatment has not been reported

Method used

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  • Preparation method and application of a kind of citric acid modified rape straw adsorbent
  • Preparation method and application of a kind of citric acid modified rape straw adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of citric acid modified rape straw adsorbent, the specific steps are as follows:

[0026] (1) Physical treatment of materials

[0027] Cut the dried rape stalks into small pieces and grind them further with a mixer, then pass through a 100-mesh sampling sieve, wash the lower part of the sampling sieve with distilled water for 4 times, and filter with a vacuum pump until the filtrate becomes clear. Dry the powder in an electric blast drying oven at 55°C for 24 hours to obtain dried rape straw powder. figure 1 It is a scanning electron microscope picture of dried rape straw powder. It can be seen from the figure that rape straw has a fibrous structure.

[0028] (2) Chemical modification

[0029] ① Just immerse the dried rape straw powder in 20v / v% isopropanol, stir it for 24 hours, filter it with a vacuum pump, wash it with 20v / v% isopropanol for 3 times, and finally wash it with distilled water until the filtrate becomes clear. The solid was dried...

Embodiment 2

[0036] Put 50mg of adsorbent into a 250mL Erlenmeyer flask with a stopper, add 50mL to a concentration of 200mg L -1 Crystal violet dye aqueous solution, the pH value of the dye solution is 5.0, and shake at a speed of 150rpm in a water bath shaker at 25°C for 0.5h, then take out the Erlenmeyer flask, pour out the solution and separate the solution from the solid at a speed of 10000rpm on a centrifuge, The obtained supernatant was measured with a spectrophotometer at the maximum absorption wavelength (588nm) of crystal violet for its absorbance, and the concentration of the remaining dye was detected, thereby obtaining a removal rate of 97.43% for the dye crystal violet.

Embodiment 3

[0038] Put 50mg of adsorbent into a 250mL Erlenmeyer flask with a stopper, add 50mL to a concentration of 300mg L -1 An aqueous solution of crystal violet dye, the pH of the dye solution is 5.32, shake in a water bath shaker at 25°C at a speed of 150rpm for 0.5h, then take out the Erlenmeyer flask, pour out the solution and separate the solution from the solid at a speed of 10000rpm on a centrifuge, The obtained supernatant was measured with a spectrophotometer at the maximum absorption wavelength (588nm) of crystal violet for its absorbance, and the concentration of the remaining dye was detected, thereby obtaining a removal rate of 99.09% for the dye crystal violet.

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Abstract

The invention belongs to the technical field of industrial waste water treatment and pollution treatment, in particular to a preparation method of a citric acid modified rape straw adsorbent and an application thereof. The method comprises the following steps of: firstly washing natural rape straws, drying, crashing, sieving for standby; and then modifying the surface of the rape straws with citric acid so as to prepare the novel adsorbent citric acid modified rape straws. The prepared adsorbent is used for treating industrial waste water, and removing cationic dye and heavy metal ions form the waste water. The result of a static absorption test shows the adsorbent has excellent adsorption effect for the cationic dye and heavy metal ions. By the invention, the agriculture waste resource is recycled; and cheap and efficient novel adsorbent is obtained to be used for treating the industrial waste water. The preparation process of the adsorbent is simple, and the prepared adsorbent has low cost and excellent adsorption effect.

Description

technical field [0001] The invention relates to the technical field of the preparation of biological adsorbents and the treatment of pollutants in industrial waste water, in particular to a preparation method and application of a citric acid-modified rape straw adsorbent. Background technique [0002] With the development of the dye industry, the problem of environmental pollution has become increasingly prominent, and dye wastewater has become one of the main harmful industrial wastewater in my country. Due to the complex aromatic ring structure in the dye structure, it is stable and difficult to biodegrade. These groups can also cause skin irritation, allergic dermatitis, cancer and gene mutation to humans. The dye wastewater makes the river water color, seriously destroys the natural ecological chain of the water body, and also greatly reduces the economic value of the water body. Therefore, how to remove the dyes in industrial wastewater has become a hot topic of resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 李逢雨陈金毅余训民李庆新唐爱林王勇龙航
Owner WUHAN INSTITUTE OF TECHNOLOGY
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