Method for preparing needle-shaped Fe-Mn-S ternary nano-material supported porous charcoal compound material
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A technology of nanomaterials and composite materials, applied in the field of preparation of porous biochar composite materials, can solve the problems of easy agglomeration and low heavy metal adsorption, and achieve the effect of improving interaction, changing the chemical state of Fe, and reducing aggregation
Active Publication Date: 2019-01-18
NORTHEAST AGRICULTURAL UNIVERSITY
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[0005] The present invention aims to solve the problem that the existing Fe-Mn binary nanomaterials are prone to agglomeration and have low adsorption capacity of heavy metals, and provides a preparation method of needle-like Fe-Mn-S ternary nanomaterials loaded with porous biochar composite materials
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specific Embodiment approach 1
[0036] Specific embodiment one: the preparation method of needle-shaped Fe-Mn-S ternary nanomaterial loaded porous biochar composite material in this embodiment comprises the following steps:
[0037] 1. Pyrolytic carbonization of biomass materials;
[0038] cutting the biomass material, washing it with distilled water for 3 to 10 times, drying it, pulverizing it, passing through a 20-mesh sieve to 100-mesh sieve to obtain a finely divided powder of the biomass material;
[0039] Mix and grind the finely divided biomass material powder and metal salt to obtain a mixture, place the obtained mixture in a tube furnace for carbonization, pass a protective gas into the tube furnace, heat up to 700-900°C for pyrolysis, and pyrolysis The time is 1 to 3 hours, and the porous biochar material after pyrolysis and carbonization is obtained;
[0040] Wherein the mass ratio of the biomass material finely divided powder to the metal salt is (1~5):(1~5);
[0041] 2. Hydrophilicize the poro...
specific Embodiment approach 2
[0045] Embodiment 2: This embodiment differs from Embodiment 1 in that the biomass material described in step 1 is one or a mixture of eucalyptus leaves, corn stalks, sawdust, and bamboo stalks. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0046] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the metal salt described in step one is KHCO 3 , NaHCO 3 、K 2 CO 3 、Na 2 CO 3 one or a mixture of several. Others are the same as in the first or second embodiment.
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Abstract
The invention provides a method for preparing a needle-shaped Fe-Mn-S ternary nano-material supported porous charcoal compound material, relates to a method for preparing porous charcoal compound materials to solve the problems that an existing Fe-Mn binary nano-material is easily agglomerated and has low adsorption capacity to heavy metals. The method comprises the following steps: 1, performingpyrolytic carbonization on a biomass material; 2, performing hydrophilic treatment on the pyrolytically carbonized porous charcoal material; 3, stirring the hydrophilic porous charcoal material in a ferric salt aqueous solution, dropwise adding a manganate solution and sulfide solution for stirring, adding a weak alkaline solution for stirring, performing hydrothermal reaction, and drying to obtain the ternary nano-material supported porous charcoal compound material. According to the method, the interaction among molecules of a ternary nano-material is reduced by supporting the Fe-Mn-S ternary nano-material to the surface of the charcoal material, nano-particle agglomeration is reduced, and the dispersibility of ternary nano-particles is improved. The method is applied to the field of charcoal compound materials.
Description
technical field [0001] The invention relates to a preparation method of a porous biochar composite material. Background technique [0002] Fe-Mn binary nanomaterials widely exist in the natural environment. The use of Fe-Mn binary oxides for sewage treatment has been extensively studied. Some iron sulfides such as FeS and FeS 2 It has a high affinity for heavy metals in sewage, so it is considered to be an excellent material for the adsorption of heavy metals in sewage. Both Fe-Mn and Fe-S binary nanomaterials have unique physical and chemical properties. Due to their easy agglomeration and uncontrollable morphology, they severely limit their effective role in the environment. [0003] At present, most of the support materials used to prevent nano-ion agglomeration are inert porous materials, such as organic polymers, zeolites, mesoporous silica, porous carbon, graphene, etc. However, activated carbon and graphene-based carbon materials are expensive, which virtually inc...
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