Preparation method of beta-cyclodextrin/polyglutamic acid modified biochar and application of biochar

A technology of polyglutamic acid and cyclodextrin, which is applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of limited chromium adsorption capacity and limited application of biochar, and achieve rapid preparation and product recovery The effect of high rate and low price

Inactive Publication Date: 2016-06-22
HUNAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption capacity of biochar to chromium in water is ...

Method used

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  • Preparation method of beta-cyclodextrin/polyglutamic acid modified biochar and application of biochar
  • Preparation method of beta-cyclodextrin/polyglutamic acid modified biochar and application of biochar
  • Preparation method of beta-cyclodextrin/polyglutamic acid modified biochar and application of biochar

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Embodiment 1

[0026] A kind of preparation of β-cyclodextrin / polyglutamic acid modified biochar of the present invention, biochar raw material selects the ramie stalk of removing leaf and bark for use, and concrete preparation method is as follows:

[0027] Preparation steps of β-cyclodextrin / polyglutamic acid: 10 g of β-cyclodextrin was dissolved in 150 mL of ultrapure water and 40 mL of sodium hydroxide solution. After that, p-toluenesulfonyl chloride (2.6 g) dissolved in 10 mL of acetonitrile was slowly added. Stirring was continued for 3 h at 25 °C and the filtrate was adjusted to neutral after filtration. The filtrate was then placed in a 4°C refrigerator overnight. The filtrate collected white crystals by filtration, and washed 3 times with acetone. Recrystallize in hot water at 90°C, at least 3 times. Dry at 60° C. for 2 days to obtain pure p-toluenesulfonyl β-cyclodextrin crystals. Then take the above 5 g of pure p-toluenesulfonyl β-cyclodextrin crystals and dissolve them in 30 ...

Embodiment 2

[0031] The β-cyclodextrin / polyglutamic acid modified biochar prepared in Example 1 is applied to the treatment of hexavalent chromium ion wastewater, including the following steps: configure 9 parts of 50mL 100mg / L chromium solution, use 1mol / L of NaOH and HCl adjusted the pH to 2, 3, 4, 5, 6, 7, 8, 9 and 10, respectively. Add the above-mentioned biochar, and the amount of adsorbent is 10 mg. They were placed in constant temperature shaking at 25°C. The rotating speed of the constant temperature oscillator in the water bath is 160rpm, and the shaking time is 24h. After the reaction is over, put it on filter paper for filtration or static precipitation to get the upper layer solution, separate the adsorbent from the solution, and the adsorption process ends. The content of unadsorbed hexavalent chromium in the wastewater was determined by ultraviolet spectrophotometry, and the calculated adsorption results are shown in Table 1.

[0032] Table 1: Adsorption capacity data of ...

Embodiment 3

[0036] The β-cyclodextrin / polyglutamic acid modified biochar prepared in Example 1 is applied to the treatment of hexavalent chromium ion wastewater, comprising the following steps: getting 50mL of the hexavalent chromium solution whose initial concentration is 100mg / L, adjusting The pH value of the solution is 2.0, add 10mg of the biochar, and carry out the adsorption reaction in constant temperature water bath oscillators at 25, 35 and 45°C respectively. solution, the adsorbent is separated from the solution, and the adsorption process is completed, and the content of unadsorbed hexavalent chromium in the wastewater is measured by ultraviolet spectrophotometry. The calculated adsorption results are shown in Table 2.

[0037] Table 2: Adsorption capacity data of adsorbents at different temperatures

[0038]

[0039] It can be seen from Table 2 that the adsorption capacity of the complex to chromium ions is 39.64 mg / g when the reaction temperature is 25 ° C, and increases s...

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Abstract

The invention relates to a preparation method of beta-cyclodextrin/polyglutamic acid modified biochar and application of the biochar. An adsorbent adopts biochar as a matrix, and beta-cyclodextrin/polyglutamic acid is grafted on the matrix. The preparation method includes the specific steps that beta-cyclodextrin/polyglutamic acid is prepared and compounded firstly, then biomass dried in the sun and ground into powder is calcined at high temperature, and after the biochar is prepared, beta-cyclodextrin/polyglutamic acid is grafted on the surface of the biochar. The application includes the steps that the modified biochar is added to 50 mL of hexavalent chromium wastewater with the concentration of 20-800 mg/L, the use amount of the biochar is 10 mg, after a vibration adsorption reaction is conducted for a period of time at the pH value of 2-9 and the temperature of 20-50 DEG C, the adsorbent is collected through filtering separation, and hexavalent chromium ions in the wastewater is removed. The preparation method has the advantages that cost is low, the process is simple, adsorption performance is high, waste is effectively utilized and easy to separate, and environment friendliness is achieved.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and specifically relates to a preparation method and application of biochar modified by β-cyclodextrin / polyglutamic acid. Background technique [0002] Chromium-containing compounds in water are typical heavy metal pollutants, which are highly toxic to humans and other organisms. Chromium has a variety of valence states and existing forms. Under different environments and biological effects, its valence states and forms will change accordingly, and the biotoxicity and bioavailability of chromium will also change. In particular, there is a large stockpile of chromium-containing waste rocks and slag at present, and the chromium-containing wastewater seeped out will pose a serious threat to the safe use of surrounding surface water, groundwater and farmland soil. Therefore, the treatment of chromium-containing wastewater produced by mines and sl...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/22
CPCB01J20/20B01J20/264C02F1/283C02F2101/22
Inventor 江卢华刘云国曾光明刘少博周璐谭小飞黄希贤李江蔡晓曦李美芳
Owner HUNAN UNIV
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