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Preparation method and application of efficient corn straw adsorbent

A corn stalk and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of insufficient heavy metal adsorption capacity and slow adsorption speed, and achieve large adsorption capacity and production technology. Simple, wide-ranging effects

Inactive Publication Date: 2014-06-25
HUNAN UNIV
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Problems solved by technology

At present, common straw modification methods include acidification modification method, alkalization modification method, biochar preparation, soaking method, etc., and other chemical modification methods. Although they can increase the heavy metal adsorption capacity to a certain extent, there are still heavy metal adsorption. The capacity is not large enough, the adsorption speed is slow, etc., such as acrylic acid modified straw on Cd 2+ The adsorption capacity of Cd was 3.2mg / g; 2+ The adsorption capacity was 12.73mg / g; the tartaric acid modified rice straw 6+ The maximum adsorption capacity is 3.15mg / g

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  • Preparation method and application of efficient corn straw adsorbent
  • Preparation method and application of efficient corn straw adsorbent

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Embodiment Construction

[0023] The pretreatment method of the raw material of corn stalks is: wash the corn stalks with deionized water, dry, crush and sieve them, and then add them into n-hexane, wherein, every 8-10g of corn stalks is added with 50-50% of n-hexane 60mL, react at 40-50°C for 3-4h, wash with deionized water, place in a vacuum drying oven at 70-80°C for 1-2h, and obtain dewaxed corn stalk powder;

[0024] The method for synthesizing acid anhydride with the chelating agent is: adding 10-15g of chelating agent (nitrilotriacetic acid) to an organic solution containing 12-15mL of acetic anhydride, 8-12mL of N,N-dimethylformamide and 12-18mL of pyridine In the process, stir at 60-70°C for 15-24 hours without air, the heater is an oil bath, and glycerin is used as the heating medium to obtain about 32-45 mL of an organic solution containing anhydride, and the order of adding reagents is pyridine, nitrilotriacetic acid , then add acid anhydride dropwise, and then add N,N-dimethylformamide;

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Abstract

The invention relates to a preparation method and application of an efficient corn straw adsorbent. The preparation method of the efficient corn straw adsorbent particularly comprises the following steps: cleaning corn straw, drying, crushing, sieving and dewaxing; then adding nitrilotriacetic acid into a mixed organic solution containing acetic anhydride and an activator, stirring at 60-70 DEG C, adding the corn straw after reaction, stirring at 70-80 DEG C, and separating, washing and drying after reaction so as to obtain the efficient modified corn straw adsorbent. The adsorbent can be used for removing heavy metal ions such as Cd<2+> and Pb<2+> in wastewater, has the absorbing capacity reaching up to 100mg / g and 160mg / g respectively for heavy metal ions of Cd<2+> and Pb<2+>, has the characteristics of simple preparation method, high absorbing capacity, reusability, adsorption stability and no secondary pollution, and also achieves resource utilization of biomass resources.

Description

technical field [0001] The invention relates to a preparation method and application of a corn stalk adsorbent. Specifically, it relates to a preparation method and application of a high-efficiency corn stalk adsorbent modified by acid anhydride, and belongs to the technical field of adsorbent materials. Background technique [0002] Corn is the grain crop with the highest total output in the world, and it is also the largest grain crop in China. The output of corn stalks reaches hundreds of millions of tons every year. However, apart from traditional utilization and simple reproduction (burning fire for cooking, returning to the field, processing feed), a large amount of corn stalks are directly burned in the open, which not only causes waste of resources, but also pollutes the atmosphere and aggravates the occurrence of smog. With the development of science and technology, although my country has carried out the development and utilization of straw in related fields, such...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 杨春平黄沅清孙志超何慧军曾光明刘红玉钟袁元龙智勇金秀举
Owner HUNAN UNIV
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