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Preparation method of green composite nano magnetic material for effectively removing heavy metals in environment

A technology of nano-magnetic materials and heavy metals, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of environmental secondary pollution, cumbersome methods, expensive raw materials, etc., and achieve energy consumption The effect of few, wide source of raw materials, and simple method

Inactive Publication Date: 2018-06-22
HARBIN INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve technical problems such as cumbersome methods for biochar-modified composite materials, expensive raw materials and a certain risk of environmental secondary pollution in modified or modified materials, and to provide a green biochar that can effectively remove heavy metals in the environment. Preparation method of composite nano magnetic material

Method used

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  • Preparation method of green composite nano magnetic material for effectively removing heavy metals in environment
  • Preparation method of green composite nano magnetic material for effectively removing heavy metals in environment
  • Preparation method of green composite nano magnetic material for effectively removing heavy metals in environment

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specific Embodiment approach 1

[0016] Specific embodiment 1: In this embodiment 1, the biomass waste is crushed, washed with ultrapure water for 2 to 3 times after passing through a 30-50 mesh sieve, and dried at a temperature of 30-50°C. Obtain biomass waste powder;

[0017] 2. Place the biomass waste powder in the quartz boat, transfer the quartz boat loaded with the biomass waste powder to the tubular pyrolysis furnace for pyrolysis, and increase the pyrolysis temperature at a heating rate of 10-20°C / min. Rise from room temperature to 550-650°C, and stay at 550-650°C for 60-120 minutes. During the pyrolysis process, nitrogen gas is continuously fed into the tubular pyrolysis furnace. Take out the quartz boat to obtain biochar raw material;

[0018] 3. Rinse the raw material of biochar with ultrapure water for 2 to 3 times and put it into FeCl 3 After mixing in the solution, stir at room temperature for 2.5 to 3.5 hours to obtain a suspension; the FeCl 3 The volume ratio of iron ion and biochar raw mat...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment differs from Embodiment 1 in that the biomass waste described in step 1 is reed stalks. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that: in step 1, after passing through a 40-mesh sieve, use ultrapure water to rinse 2 to 3 times. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a green composite nano magnetic material for effectively removing heavy metals in an environment. The invention relates to the field of environmental functional materials, and particularly relates to a preparation method of a composite nano magnetic material. The invention aims at solving the technical problems that a current method of a biochar improved composite material is fussy, raw materials are expensive and meanwhile, a modified or improved material still has a certain risk of the secondary pollution to the environment and the like. The method comprises the following steps of 1, carrying out the pretreatment of biomass waste; 2, carrying out the thermal conversion from biomass to biochar; 3, carrying out the mixed culture of the biochar and ferric iron in a liquid phase; 4, carrying out a reduction reaction on suspension liquid by utilizing a liquid-phase deposition method, so as to obtain a nano zero-valent iron loaded carbon material, flushing, carrying out suction filtration, and oven-drying to obtain the green composite nano magnetic material. The green composite nano magnetic material is used for removing the heavy metalsin the environment, within a short time, has better removal capacity for six common heavy metals in the environment, and meanwhile, has higher magnetism; the removal efficiency reaches 95 percent or above, and the recycling is facilitated.

Description

technical field [0001] The invention relates to the field of environmental functional materials, in particular to a preparation method of a composite nano-magnetic material. Background technique [0002] In recent years, due to the massive discharge of industrial sewage, a large amount of heavy metal pollutants have entered the environment. If they are not treated, they will cause long-term toxic effects on organisms. Currently commonly used chemical methods are expensive, and the long cycle of bioremediation is not conducive to short-term control of heavy metal emissions. Recently, due to the large-scale application of artificial wetlands in water treatment and the advancement of sponge cities, a large amount of plant wastes are used as green biomass raw materials to prepare cheap adsorbents to remove heavy metals in the environment, which has become a recent scientific hotspot. Features such as low risk of secondary pollution. The technology of pyrolyzing biomass to prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/28009C02F1/283C02F2101/20
Inventor 马放徐炳乾朱世殊黄晓辰王立
Owner HARBIN INST OF TECH
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