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Biochar-chitosan composite as well as preparation method and application thereof

A composite material and biochar technology, applied in the field of material science and engineering, can solve the problems of difficult adsorption efficiency and low adsorption capacity, and achieve the effect of obvious adsorption effect, large adsorption capacity and easy large-scale production

Inactive Publication Date: 2018-06-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent publication number CN105236507A discloses a method for removing hexavalent chromium in wastewater by a composite adsorbent of β-cyclodextrin chitosan and walnut shell biochar, Wang Xufeng et al. (Industrial Water Treatment. January 2017. Volume 37 No. Phase 1) with KMnO 4 Modified corn cob biochar and used to adsorb Cu in water 2+ and ammonia nitrogen, but these adsorbents are effective against heavy metal Cu in wastewater 2+ and Cr 6+ The adsorption capacity is relatively low, and it is difficult to achieve high adsorption efficiency, so the preparation of adsorbents with high adsorption capacity has become an urgent problem to be solved.

Method used

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  • Biochar-chitosan composite as well as preparation method and application thereof
  • Biochar-chitosan composite as well as preparation method and application thereof
  • Biochar-chitosan composite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 10g of pulverized loofah and 200ml of 1.0mol / L FeCl 3 ﹒ 6H 2 O was mixed, and then the sulfuric acid of 0.98mol / L of 50ml was added. The resulting mixture was sonicated for 2 hours at a frequency of 100 KHz, filtered after mixing, and then dried in a vacuum oven for 12 hours (70° C.) to obtain the primary product of biochar material BC. The primary product was heated to 700°C under a nitrogen atmosphere, pyrolyzed for 2 hours, and washed repeatedly until neutral to obtain biochar material L-Fe. First dissolve 2g of chitosan powder in acetic acid of 1.75mol / L (purity 98%), add 2g of biochar material L-Fe sample to the above-mentioned acetic acid and chitosan mixture, and put the compound in a water bath Heat and stir (60°C, 2h) until well mixed. Afterwards, NaOH solution was added dropwise to the mixture until pH = 9, and the compound was continued to be stirred. Finally, the insoluble matter in the solution was filtered, washed, and dried (80° C., 8 h) for late...

Embodiment 2

[0027] Get 10g of pulverized loofah and 300ml of 1.0mol / L FeCl 3 ﹒ 6H 2 O was mixed, and then added the sulfuric acid of 0.98mol / L of 100ml. The resulting mixture was sonicated for 2 hours at a frequency of 100 KHz, filtered after mixing, and then dried in a vacuum oven for 12 hours (100° C.) to obtain the primary product of biochar material BC. The primary product was heated to 700°C under a nitrogen atmosphere, pyrolyzed for 2 hours, and washed repeatedly until neutral to obtain biochar material L-Fe. First dissolve 1g of chitosan powder in acetic acid of 1.75mol / L (98% purity), add 2g of biochar material L-Fe sample to the above-mentioned acetic acid and chitosan mixture, and place the compound in a water bath Heat and stir (60°C, 2h) until well mixed. Afterwards, NaOH solution was added dropwise to the mixture until pH = 9, and the compound was continued to be stirred. Finally, the insoluble matter in the solution was filtered, washed, and dried (80° C., 8 h) for late...

Embodiment 3

[0029] Get 10g of pulverized loofah and 200ml of 1.0mol / L FeCl 3 ﹒ 6H 2 O was mixed, and then added the sulfuric acid of 0.98mol / L of 100ml. The resulting mixture was ultrasonically treated at a frequency of 100KHz for 2h, mixed and filtered, and then dried in a vacuum oven for 12h (50°C) to obtain the primary product of biochar material BC. The primary product was heated to 700°C under a nitrogen atmosphere, pyrolyzed for 2 hours, and washed repeatedly until neutral to obtain biochar material L-Fe. First dissolve the chitosan powder of 0.75g in the acetic acid of 1.75mol / L (purity 98%), add 1g biochar material L-Fe sample to above-mentioned acetic acid, chitosan mixed solution, and compound in the water bath Heat and stir (60°C, 2h) in medium until fully mixed. Afterwards, NaOH solution was added dropwise to the mixture until pH = 9, and the compound was continued to be stirred. Finally, the insoluble matter in the solution was filtered, washed, and dried (80° C., 8 h) f...

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Abstract

The invention discloses a biochar-chitosan composite as well as a preparation method and an application thereof. The preparation method comprises steps as follows: (a) a biomass material is mixed withsoluble iron salt and a sulfuric acid solution, a mixed solution is obtained, the mixed solution is subjected to ultrasonic treatment, filtration and drying, and a biochar material head product BC isobtained; (b) the head product is subjected to high-temperature pyrolysis, and a biochar material L-Fe is obtained; (c) a certain mass of chitosan powder is dissolved in an acetic acid solution, a mixed solution is formed, a certain mass of biochar material L-Fe samples are taken and added to the mixed solution, the mixture is heated and stirred in a water bath pot, the PH value is adjusted to bealkaline, filtration and drying are performed, and a biochar-chitosan composite LC-Fe is prepared. The method adopts a simple preparation process and has no secondary pollution, and the prepared modified biochar material has high adsorption capacity and adsorption rate for Cr<6+> and Cu<2+> and has wide application prospects in the aspects of wastewater treatment and purification.

Description

technical field [0001] The invention belongs to the field of material science and engineering, in particular to a preparation method of a biochar-chitosan composite material and its absorption of heavy metal Cr in water. 6+ and Cu 2+ Applications. Background technique [0002] With the rapid development of modern industrial and agricultural production, heavy metals enter water bodies through man-made pollution sources such as mining, metal smelting, metal processing, and chemical production wastewater, as well as natural sources such as geological erosion and weathering, and endanger human life and health through the food chain. What is more serious is that heavy metal pollution has the characteristics of concealment, long-term, irreversible and serious consequences. Regarding the treatment technology of heavy metal pollution, at present, most of them adopt precipitation, membrane separation, ion exchange, adsorption and so on. Most of the adsorption methods use the metho...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28C02F1/28C02F101/20C02F101/22
Inventor 程建华肖芳芳游霞
Owner SOUTH CHINA UNIV OF TECH
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