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Method for removing salt by virtue of sphagnum-derived biomass carbon electrode

A biomass carbon and peat moss technology, applied in separation methods, dispersed particle separation, seawater treatment, etc., can solve the problems of limiting the wide application of CDI, secondary pollution of the environment, and high cost, improving the transmission and diffusion capacity, and improving environmental protection. the effect of increasing the contact area

Active Publication Date: 2019-06-28
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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  • Method for removing salt by virtue of sphagnum-derived biomass carbon electrode
  • Method for removing salt by virtue of sphagnum-derived biomass carbon electrode
  • Method for removing salt by virtue of sphagnum-derived biomass carbon electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 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:

[0044] One, making material selection and equipment: choose fresh sphagnum moss as the basic material, test with saline (NaCl aqueous solution, 250mgL -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.

[0045] 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 ho...

Embodiment 2

[0050] 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.

[0051] 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.

[0052] as attached Figure 5 As shown, the operator then put the freeze-dried and carbonized sphagnum moss into a transmission electron micros...

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Abstract

The invention discloses a method for removing salt by virtue of a sphagnum-derived biomass carbon electrode. The method specifically comprises the following steps: (1) carbonizing sphagnum, and uniformly grinding the carbonized sphagnum into powder; (2) mixing biomass carbon, carbon black and PTFE in a proportion, and uniformly stirring the mixture; (3) uniformly smearing the surface of graphite paper with the mixture so as to prepare electrode slices, and heating drying the electrode slices; and (4) with the dried electrode slices as an anode and a cathode, putting two electrodes into an electrodeionization reactor, pumping saline water into the reactor by virtue of a peristaltic pump, carrying out circular treatment, and applying the voltage to two ends of the electrodes for deionizationtesting. According to the invention, the sphagnum is utilized as an initial material for the first time for preparing biomass derived carbon through a carbonation process, and a CDI electrode prepared from the biomass carbon material as an active substance has the advantages of large specific surface area, reasonable pore structure, excellent conductivity and water tolerance and the like.

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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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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