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Method for preparing biochar from tea residues

A technology of biochar and tea dregs, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of waste of resources, increase costs, etc., and achieve strong adsorption effect, increased adsorption capacity, and obvious adsorption effect

Pending Publication Date: 2021-06-18
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, except for a small amount of accumulated tea leaves and cut tea branches after drinking, most of them are treated as waste, which leads to a serious waste of resources and increases the cost of treatment.

Method used

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  • Method for preparing biochar from tea residues
  • Method for preparing biochar from tea residues
  • Method for preparing biochar from tea residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Preparation and characterization of tea residue biochar

[0058] Tea leaves are used as raw materials for preparing biochar, crushed by a pulverizer, passed through a 60-mesh sieve, and dried in an oven. The dried tea residue was pyrolyzed for 120min at 500°C and N2 conditions of a tube furnace, and after cooling ( figure 1 ) to grind biochar.

[0059]Mix the above biochar material with saturated KOH solution (alkali-carbon ratio 1.5:1) for 9 hours, dry and cool, then grind. Pyrolyze at 700°C under N2 for 120min, take it out, grind it, wash it repeatedly with water and 0.1mol / L hydrochloric acid until it is nearly neutral, and dry to obtain the activated biochar material ( figure 1 ), stored in a desiccator for later use.

[0060] The crystal form of the activated biochar was characterized by X-ray powder diffraction, the BET specific surface area was measured, and its morphology was observed by SEM. The results showed that the prepared activated biochar ...

Embodiment 2

[0061] Example 2, the adsorption experiment of tea dregs biochar to bispyribac

[0062] Prepare bispyribac ether solutions with different concentrations, measure the absorbance at 247nm with a UV spectrophotometer, and make a standard curve.

[0063] Two parts of 100mg / L bispyribac ether solution were prepared for use. Weigh 0.015g activated biochar and unactivated biochar and add to the above solution, another solution without biochar is placed in a magnetic stirrer for reaction, and the reaction temperature is 25°C. Take samples at different time intervals, place them in a high-speed centrifuge at room temperature and centrifuge at 6000r / min for 15min, take out the supernatant solution and filter it with a 0.22μm aqueous phase needle, measure its absorbance with a UV spectrophotometer, repeat three times for each group, Take the average value and substitute it into the standard curve to calculate the concentration.

[0064] After measurement, it was found that the removal ...

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Abstract

The invention relates to a method for preparing biochar from tea residues, which comprises the following steps of: crushing the tea residues serving as a raw material for preparing the biochar by using a crusher, sieving by using a 60-mesh sieve, and drying in a drying oven; pyrolyzing the dried tea residues in a tubular furnace at 500 DEG C under N2 for 120 minutes, cooling and grinding to obtain the charcoal; and fully mixing the biochar material with a saturated KOH solution for 9 hours, drying, cooling, grinding, pyrolyzing at 700 DEG C under N2 for 120 minutes, taking out, grinding, repeatedly washing and pickling with water and 0.1 mol / L hydrochloric acid until the biochar material is nearly neutral, and finally drying to obtain the activated biochar material. The surface of the activated biochar has abundant porous structures, the specific surface area is 768.07 m < 2 > / g, and compared with non-activated bispyribac-sodium, the specific surface area is increased by 143.56 times. Meanwhile, adsorption determination is carried out on herbicide bispyribac-sodium, the result shows that the activated tea residue biochar has a good effect on bispyribac-sodium, and compared with non-activated biochar, the adsorption capacity of the activated tea residue biochar is improved by 7.76 times.

Description

technical field [0001] The invention is applied in the technical field of carbon materials, and specifically relates to a method for preparing biochar from tea dregs. Background technique [0002] According to statistics, in 2019, Fujian Province has an area of ​​3.3 million mu of tea gardens and an output of 470,100 tons of raw tea; the province has 26 national-level improved tea tree varieties and 18 provincial-level improved varieties, and the promotion area of ​​clonal improved varieties has reached more than 96%, ranking the leading position in the country status. However, except for a small amount of accumulated tea leaves and cut tea branches after drinking, most of them are treated as waste, causing a serious waste of resources and increasing the cost of treatment. Using tea dregs to prepare biochar can re-use and redistribute resources, and can realize the treatment of waste and turn waste into wealth, which meets the needs of an environment-friendly society. [0...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30
CPCB01J20/20B01J2220/4825
Inventor 陈芳容方云游雨欣洪慈清桂芳泽潘晓鸿关雄
Owner FUJIAN AGRI & FORESTRY UNIV
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