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Nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium as well as preparation and application methods of nitrogen-doped porous carbon electrode material

A nitrogen-doped porous carbon and electrode material technology, applied in the field of water treatment, can solve problems such as poor recovery efficiency of hexavalent chromium, and achieve the effects of excellent electrosorption performance, easily controllable conditions, and large specific surface area.

Active Publication Date: 2021-07-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium, and its preparation and application method, aiming to solve the technical problem of poor recovery efficiency of hexavalent chromium in the above-mentioned wastewater

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  • Nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium as well as preparation and application methods of nitrogen-doped porous carbon electrode material
  • Nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium as well as preparation and application methods of nitrogen-doped porous carbon electrode material
  • Nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium as well as preparation and application methods of nitrogen-doped porous carbon electrode material

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Embodiment 1

[0060] A nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium and its preparation method

[0061] 1. Weigh 1g (i.e. 1mol) of m-phenylenediamine monomer and place it in a 250mL flat-bottomed flask, add 100mL of deionized water, and magnetically stir to completely dissolve m-phenylenediamine to obtain an aqueous solution of m-phenylenediamine; weigh 2.6191 g (that is, 1 mol) of sodium persulfate is placed in a beaker, and 20 mL of deionized water is added to dissolve it to obtain an aqueous solution of sodium persulfate.

[0062] 2. Add the aqueous solution of sodium persulfate dropwise into the flat-bottomed flask containing the aqueous solution of m-phenylenediamine, and keep stirring at 25°C for 8 hours to make the polymerization reaction complete; Separation by suction filtration, followed by washing with 1:1 ammonia water and deionized water to remove impurities, and drying after washing, the obtained black powder is the prepared poly-m-phenylen...

Embodiment 2

[0067] A nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium and its preparation method

[0068] 1. Weigh 1g (i.e. 1mol) of m-phenylenediamine monomer and place it in a 250mL flat-bottomed flask, add 100mL of deionized water, and magnetically stir to completely dissolve m-phenylenediamine to obtain an aqueous solution of m-phenylenediamine; weigh 2.6191 g (that is, 1 mol) of sodium persulfate is placed in a beaker, and 20 mL of deionized water is added to dissolve it to obtain an aqueous solution of sodium persulfate.

[0069] 2. Add the aqueous solution of sodium persulfate dropwise into the flat-bottomed flask containing the aqueous solution of m-phenylenediamine, and keep stirring at 25°C for 8 hours to make the polymerization reaction complete; Separation by suction filtration, followed by washing with 1:1 ammonia water and deionized water to remove impurities, and drying after washing, the obtained black powder is the prepared poly-m-phenylen...

Embodiment 3

[0074] A nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium and its preparation method

[0075] 1. Weigh 1g (i.e. 1mol) of m-phenylenediamine monomer and place it in a 250mL flat-bottomed flask, add 100mL of deionized water, and magnetically stir to completely dissolve m-phenylenediamine to obtain an aqueous solution of m-phenylenediamine; weigh 2.6191 g (that is, 1 mol) of sodium persulfate is placed in a beaker, and 20 mL of deionized water is added to dissolve it to obtain an aqueous solution of sodium persulfate.

[0076] 2. Add the aqueous solution of sodium persulfate dropwise into the flat-bottomed flask containing the aqueous solution of m-phenylenediamine, and keep stirring at 25°C for 8 hours to make the polymerization reaction complete; Separation by suction filtration, followed by washing with 1:1 ammonia water and deionized water to remove impurities, and drying after washing, the obtained black powder is the prepared poly-m-phenylen...

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Abstract

The invention provides a nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium. According to the nitrogen-doped porous carbon electrode material, a nitrogen content ranges from 0.86 at.% to 10.52 at.%, a carbon content ranges from 74.2 at.% to 93.39 at.%, and an oxygen content ranges from 5.75 at.% to 15.28 at.%; and the nitrogen-doped porous carbon electrode material has a particle size of 0.5-3 [mu]m, a specific surface area of 1189-3150 m<2> / g, and a pore volume of 0.55-2.30 cm<3> / g. The preparation method of the nitrogen-doped porous carbon electrode material comprises the following steps: carrying out a polymerization reaction on m-phenylenediamine in an aqueous solution containing persulfate, and carrying out separation, cleaning and drying treatment on a product obtained after the polymerization reaction to obtain poly(m-phenylenediamine) particles; and mixing the poly(m-phenylenediamine) particles with bicarbonate, conducting activating at a temperature of 600-1000 DEG C in an N2 atmosphere, and performing cleaning and drying after activation so as to finally obtain the nitrogen-doped porous carbon electrode material with excellent electro-adsorption performance on hexavalent chromium in a water body.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a nitrogen-doped porous carbon electrode material for adsorbing hexavalent chromium, and a preparation and application method thereof. Background technique [0002] Chromium-containing wastewater is an important source of pollution in metallurgical and other industrial processes. Hexavalent chromium is highly toxic and seriously endangers human health and the ecological environment. The development of efficient treatment technologies for hexavalent chromium-containing wastewater is imminent. Capacitive deionization (CDI), chemical precipitation, adsorption, ion exchange and membrane treatment are the main methods for removing hexavalent chromium. Among them, capacitive deionization has attracted extensive attention of researchers due to its advantages of low cost, easy electrode regeneration, no secondary pollution, and easy operation. [0003] At present, the research on CDI proc...

Claims

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Application Information

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IPC IPC(8): C01B32/05C02F1/469C02F1/461C02F101/22
CPCC01B32/05C02F1/4691C02F1/46109C02F2001/46133C02F2001/46161C02F2101/22C01P2004/03C01P2006/17
Inventor 王海鹰贺颖捷柴立元吴弼朝金林锋杨志辉侯兰晶唐崇俭刘恢
Owner CENT SOUTH UNIV