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A method for desalination with sphagnum-derived biomass carbon electrodes

A technology of biomass carbon and sphagnum moss, applied in separation methods, dispersed particle separation, seawater treatment, etc., can solve the problems of limiting the wide application of CDI, environmental secondary pollution, low yield, etc., to improve transmission and diffusion capabilities, Improve environmental protection and increase the effect of adsorption sites

Active Publication Date: 2021-04-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials have high cost and low yield, and a large amount of toxic and harmful reagents are used in the preparation process, causing secondary pollution to the environment, which limits their wide application in CDI.

Method used

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  • A method for desalination with sphagnum-derived biomass carbon electrodes
  • A method for desalination with sphagnum-derived biomass carbon electrodes
  • A method for desalination with sphagnum-derived biomass carbon electrodes

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Experimental program
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Embodiment 1

[0038] The embodiment is basically as attached figure 2 Shown: A method for desalination with a sphagnum-derived biomass carbon electrode divided into the following stages:

[0039] One, making material selection and equipment: choose fresh sphagnum moss as basic material, test with saline (NaCl aqueous solution, 250mg L -1 ), the auxiliary materials are ultrapure water, nitrogen tank, graphite paper, carbon black and PTFE (polytetrafluoroethylene), and the selected equipment is tube furnace, mortar, programming heating plate, electronic balance, mechanical stirring tool, scissors, Medicine spoon, beaker and power supply.

[0040] 2. Carbonization stage: put the sphagnum moss into the tube furnace in a vacuum state, the operator continuously feeds nitrogen into the tube furnace to make the nitrogen serve as the atmosphere, and then the operator sets the heating rate of the preset tube furnace to 3 °C / min, the peat moss was carbonized at a temperature of 800 °C for two hours...

Embodiment 2

[0045] as attached image 3 As shown, the difference between this embodiment and Embodiment 1 lies in two points, the first point is to add liquid nitrogen and tweezers to the selected equipment, and the second point is to pretreat the peat moss before carbonization treatment, put the peat moss into Soak in ultra-pure water for 24 hours to absorb enough water, and then use liquid nitrogen freeze-drying technology to freeze-dry the material.

[0046] as attached Figure 4 As shown, freeze-dried carbonized peat moss was observed under a scanning electron microscope. After absorbing ultrapure water, the surface of sphagnum moss is completely stretched, the pore size distribution is orderly, the structure does not collapse, and there is no obvious crack on the surface of sphagnum moss under the quick freezing effect of liquid nitrogen.

[0047] as attached Figure 5 As shown, the operator then put the freeze-dried and carbonized sphagnum moss into a transmission electron microsco...

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Abstract

The invention discloses a method for desalting a biomass carbon electrode derived from sphagnum moss in the field of seawater desalination. The specific steps of the method are as follows: Step 1: carbonize the sphagnum moss to obtain carbonized biochar, and then uniformly grind it into powder ; Step 2, prepare biomass carbon, carbon black and PTFE in proportion, then stir the mixed substance evenly; Step 3, apply the mixed substance evenly on the surface of graphite paper to make an electrode sheet, and then heat and dry the electrode sheet; Step 4: Use the dried electrode sheets as positive and negative electrodes, put the two electrodes into the electrostatic desalination reactor, use a peristaltic pump to pump brine into the reactor and circulate it, and apply voltage to both ends of the electrodes for desalination test. This patent uses sphagnum moss as the initial material for the first time to prepare biomass-derived carbon through the carbonization process. The CDI electrode prepared by using this biomass carbon material as the active material has a large specific surface area, a reasonable pore structure, and excellent electrical conductivity and water resistance. advantages such as sex.

Description

technical field [0001] The invention belongs to the field of seawater desalination, in particular to a method for desalting a biomass carbon electrode derived from sphagnum moss. Background technique [0002] The shortage of water resources has become one of the urgent problems in the world, and seawater desalination is an effective way to alleviate this problem. Compared with traditional desalination technologies such as distillation, reverse osmosis, and electrodialysis, capacitive deionization (CDI) technology has attracted extensive attention in recent years due to its low cost, low energy consumption, and environmental friendliness. The working principle of CDI is based on the electric double layer theory. During the charging process, the anions and cations in the brine are adsorbed on the positive and negative electrodes respectively; during the discharging process, the adsorbed salt ions are desorbed back into the salt solution. [0003] Generally, the performance of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F103/08
Inventor 严乙铭臧小刚严尉之倪伟徐敏李聪欣
Owner BEIJING UNIV OF CHEM TECH
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