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Coffee residue biochar and method for removing urea in water

A coffee grounds, biochar technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as weak urea absorption capacity, inability to destroy urea N bonds, and inability to be removed by charge repulsion, etc.

Active Publication Date: 2021-10-22
TG HILYTE ENVIRONMENTAL TECHNOLOGY (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated carbon adsorption can only remove some larger non-polar molecules, while some polar small molecules with high water solubility (such as: isopropanol, urea, etc.) cannot be effectively adsorbed
Since urea is an uncharged small molecule that can neither be removed by size exclusion nor charge repulsion, it is also difficult to remove urea from water by reverse osmosis process
In addition, urea has weak absorption ability to UV radiation, and UV radiation alone cannot destroy the N bond in urea, so it is difficult to remove urea in water by UV

Method used

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  • Coffee residue biochar and method for removing urea in water
  • Coffee residue biochar and method for removing urea in water
  • Coffee residue biochar and method for removing urea in water

Examples

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preparation example Construction

[0027] The invention provides a preparation method of modified coffee grounds biochar, comprising: calcining coffee grounds at a high temperature for the first time under oxygen-limited conditions, and after grinding, obtaining coffee grounds biochar; The second high-temperature calcination obtains the modified coffee grounds biochar.

[0028] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0029] The coffee grounds are the remaining residues of coffee drinks prepared from coffee beans, and the raw materials of the present invention can be obtained after drying; in the present invention, the coffee grounds are preferably vacuum-dried first; the vacuum drying temperature is preferably 100°C~ 110°C, more preferably 105°C; the vacuum drying time is preferably 20-30 h, more preferably 22-26 h, and more preferably 24 h.

[0030] After vacuum drying, the first high-temperature calcination is car...

Embodiment 1

[0043] A preparation of modified coffee grounds biochar and its removal effect on low-concentration urea under different dosages of sodium persulfate, comprising the following steps:

[0044] 1.1 Put the dried coffee grounds in a vacuum oven at 105°C for 24 hours;

[0045] 1.2 Put the coffee grounds in a ceramic crucible, wrap it with aluminum foil, put the lid on and put it in a muffle furnace, heat it up to 900°C at a heating rate of 5°C / min, and keep it for 2 hours. After natural cooling, turn on the furnace and take it out ;

[0046] 1.3 Grind the cooled biochar through an 80-mesh sieve to obtain the coffee grounds biochar product;

[0047] 1.4 Put the coffee grounds biochar in a ceramic crucible, put it in a muffle furnace, heat it up to 550°C at a heating rate of 2°C / min, and keep it for 4 hours. After natural cooling, turn on the furnace and take it out to get the final modified charcoal. Sexual coffee grounds biochar products;

[0048] 1.5 Add 400 mL of 1 mg / L urea ...

Embodiment 2

[0051] The modified biochar prepared in Example 1 of the present invention was placed in urea solution with different dosages for catalysis.

[0052] Add 400 mL of 1 mg / L urea solution to a 500 mL Erlenmeyer flask without adjusting the initial pH of the solution. Afterwards, the biochar samples (0.05, 0.1, 0.2, 0.4, 0.8 g / L) prepared in Experimental Case 1 were accurately weighed into 500 mL Erlenmeyer flasks, and 2 g / L persulfate was added to induce the reaction. Place the Erlenmeyer flask in a constant temperature shaker (180 r / min, 25°C), and stop the reaction after 5 hours. After passing the obtained sample through a filter membrane of 45 μm, the absorbance of the filtrate was measured by UV, and the concentration was converted and recorded according to the standard curve of urea, and the results were obtained as follows: figure 2 shown. All experiments were performed in triplicate and the results were averaged.

[0053] Depend on figure 2 It can be seen that the use...

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Abstract

The invention provides a method for removing urea in water. The method comprises the following steps: mixing modified coffee residue charcoal, persulfate and a urea-containing aqueous solution, and carrying out oscillating reaction to obtain a treated aqueous solution. The modified coffee residue biochar is prepared according to the following steps: carrying out first high-temperature calcination on coffee residue under an oxygen-limited condition, and performing grinding to obtain coffee residue biochar; and carrying out second high-temperature calcination on the coffee residue biochar to obtain the modified coffee residue biochar. Compared with the prior art, the method has the advantages that: the biochar material is prepared from the coffee residue, the modified biochar material is obtained through simple modification, the modified biochar material is used for activating persulfate to catalyze and remove trace urea in recycled water, stable operation of an ultrapure water preparation system is guaranteed, TOC (total organic carbon) of supplied water reaches the standard, and meanwhile, a foundation is provided for resource utilization.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for removing coffee grounds biochar and urea in water. Background technique [0002] The semiconductor industry is a high water-consuming industry, especially in the case of limited water resources, water restrictions and water shortages have put enormous pressure on the operations of semiconductor manufacturers. At present, more and more ultrapure water systems use reclaimed water as the water source. Replacing some municipal water with reclaimed water is a major trend and an inevitable issue for the semiconductor industry. [0003] However, compared with tap water, the content of organic matter in reclaimed water is often high. Such small molecular organic matter is difficult to remove through the traditional ultrapure water preparation system, which will cause the TOC of the terminal water supply to exceed the standard. Therefore, it is necessary to find an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C01B32/05B01J21/18C02F101/34C02F101/38
CPCC02F1/725C01B32/05B01J21/18C02F2101/38C02F2101/34
Inventor 张建清王晓张新波
Owner TG HILYTE ENVIRONMENTAL TECHNOLOGY (BEIJING) CO LTD
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