Method for removing hexavalent chromium in wastewater by magnetic cellulose/polyglutamic acid coupling material

A polyglutamic acid and cellulose technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of low selectivity, not very strong, enhancement, etc., and achieve a wide range of raw material sources , low price, and low processing cost

Active Publication Date: 2019-07-19
INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural cellulose has a certain adsorption capacity for heavy metal ions, but it is not very strong, and the adsorption capacity is small and the selectivity is low. However, the modified cellulose has better adsorption capacity. Therefore, the modified cellulose has become An Adsorptive Material with Excellent Performance
Polyglutamic acid is an amino acid that can be synthesized by microorganisms. The polymer structure not only has a large number of -COOH reactive groups, but also a large number of -NH-active groups. After modifying cellulose, the adsorption capacity of heavy metal cations is greatly enhanced. , there are few related reports at home and abroad

Method used

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  • Method for removing hexavalent chromium in wastewater by magnetic cellulose/polyglutamic acid coupling material
  • Method for removing hexavalent chromium in wastewater by magnetic cellulose/polyglutamic acid coupling material
  • Method for removing hexavalent chromium in wastewater by magnetic cellulose/polyglutamic acid coupling material

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Embodiment 1

[0034] A kind of method utilizing magnetic cellulose / polyglutamic acid coupling material of the present invention to remove hexavalent chromium in waste water comprises the following steps:

[0035] 1. Preparation of magnetic cellulose / polyglutamic acid coupling materials

[0036] The peeled kenaf stems were dried at 80°C for 2 hours, pulverized by a pulverizer and then ground, passed through a 100-mesh sieve, and dried at 65°C for 2 hours. Take 10g of the above powder and disperse it into 60ml of n-hexane, 50°C for 3h to remove the vegetable wax, then add the dewaxed ramie fiber into 500ml of NaOH with a molar concentration of 4mol / L, shake at 25°C for 24h, then filter it, and then Wash with a large amount of ultrapure water, ethanol, and methanol, then dry at 65°C for 2 hours, and cool to room temperature to obtain alkalized kenaf cellulose;

[0037] Weigh 2.0g of cellulose and 4.0g of polyglutamic acid (monomer molar ratio about 1:2.5-3) and mix them fully under an infrare...

Embodiment 2

[0042] A kind of method utilizing magnetic cellulose / polyglutamic acid coupling material of the present invention to remove hexavalent chromium in waste water comprises the following steps:

[0043] 1. Preparation of magnetic cellulose / polyglutamic acid coupling materials

[0044] This step is the same as Step 1 of Example 1.

[0045] 2. Treatment of hexavalent chromium wastewater

[0046] Add the magnetic cellulose / polyglutamic acid coupling material prepared by the above method to hexavalent chromium wastewater with an initial pH value of 2. The initial concentrations of hexavalent chromium ions are 10, 50, and 100 mg / L respectively, and each liter of wastewater The amount added in sodium humate / biochar magnetic composite material is 1.0g based on the dry weight of the sodium humate / biochar magnetic composite material. The reactor is placed in a shaking box with a rotation speed of 150rpm, and the temperature is kept at 30°C. After shaking for 24 hours, the magnetic cellulo...

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Abstract

The invention discloses a method for adsorbing and removing hexavalent chromium in wastewater by the aid of magnetic cellulose / polyglutamic acid coupling materials. The method includes steps of acquiring a certain quantity of hexavalent chromium wastewater and regulating a pH (potential of hydrogen) value of the hexavalent chromium wastewater until the pH value reaches 2.0-7.0 (preferably 2.0-6.0 and optimally 2.0); adding, by dry weight, 0.2-10 g of magnetic cellulose / polyglutamic acid coupling materials into each liter of wastewater to obtain mixtures; carrying out reaction on the mixtures in a constant-temperature vibrator at the rotational speed of 100-300 rpm and the reaction temperature of 10-50 DEG C under the control for 0-24 h (optimally 1-8 h); separating the magnetic cellulose / polyglutamic acid coupling materials from solution after the reaction is completely carried out so as to remove the hexavalent chromium in the wastewater. The method has the advantages of low cost, convenience in operation, high treatment efficiency and the like. Besides, the method can be applied to treating hexavalent-chromium-containing wastewater from electroplating factories, smelting plants, electronics factories and the like.

Description

technical field [0001] The invention relates to the application of kenaf cellulose composite material in the field of wastewater treatment, in particular to the application of a magnetic cellulose / polyglutamic acid coupling material in the treatment of heavy metal wastewater. Background technique [0002] Heavy metal pollution is a serious environmental pollution problem. In the process of industrialization, a large amount of industrial wastewater is discharged into the natural environment. For example, industrial wastewater discharged from industries such as metal processing, electroplating, and tanning usually contains a large amount of chromium ions. The chromium ions in industrial wastewater are mainly compounds of hexavalent chromium, which often exist as chromate ions, and the toxicity of hexavalent chromium is more than three The valence of chromium is many times higher. Therefore, in order to alleviate the environmental pollution caused by hexavalent chromium, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/26B01J20/30
CPCB01J20/24B01J20/265B01J20/28009B01J2220/4875C02F1/285C02F1/286C02F2101/22
Inventor 王慧王玉富郭媛邱财生龙松华郝冬梅钟国乾许雯雯
Owner INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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