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Porous doped charcoal-based heavy metal/antibiotic adsorbent and preparation method thereof

A technology of biochar and heavy metals, applied in the direction of alkali metal oxides/hydroxides, alkali metal compounds, chemical instruments and methods, etc., can solve problems such as high cost and complicated production process, and achieve increased porosity and specific surface area, Enhance the adsorption capacity and enhance the effect of adsorption active sites

Pending Publication Date: 2022-07-19
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] Previous research has focused on the preparation of biomass by pyrolysis or hydrothermal carbonization in an oxygen-free environment (ZL201910017024.0, ZL201910016896.5, ZL202010615097.2, ZL201911309856.6, ZL201910896659.2), which inevitably use strong acid , strong alkali, strong oxidant, etc. for pore formation and surface activation, and secondly, the use of inert gas also leads to more complicated production process and higher cost

Method used

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  • Porous doped charcoal-based heavy metal/antibiotic adsorbent and preparation method thereof

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preparation example Construction

[0016] A porous doped biochar-based heavy metal / antibiotic adsorbent and a preparation method, characterized in that it comprises the following steps:

[0017] Step S1: mixing the wood block, molten salt, and heteroatom precursor according to a certain mass ratio;

[0018] Step S2: placing the mixture prepared in step S1 in a muffle furnace, and pyrolyzing at a constant temperature in an air atmosphere to obtain a biochar precursor.

[0019] Step S3: Washing, filtering, and drying the biochar precursor prepared in Step S2 to obtain porous doped biochar.

[0020] Preferably, the molten salt is one or more of halides, nitrates, sulfates and carbonates of lithium, sodium, potassium, magnesium, aluminum, calcium, iron, cobalt, nickel and manganese.

[0021] Preferably, the heteroatom precursor is an inorganic compound or an organic compound containing boron, nitrogen, sulfur and phosphorus.

[0022] Preferably, the mass ratio is 1:(5~20):(0.1~1).

[0023] Preferably, the temper...

Embodiment 1

[0028] The present embodiment provides a porous doped biochar-based heavy metal / antibiotic adsorbent and a preparation method, characterized in that the following steps are included:

[0029] Step 1, weigh the wood block and CaCl respectively according to the mass ratio of 1:20:0.5 2 / FeCl 3 Mixed salts (CaCl 2 with FeCl 3 The molar ratio of 17:33, urea, grinding and mixing evenly;

[0030] In step II, the mixture prepared in step I is placed in a muffle furnace, and in an air atmosphere, the temperature is raised to 500 degrees at a heating rate of 5 degrees per minute, and the pyrolysis time is 2 hours to obtain a biochar precursor.

[0031] In step III, the biochar precursor prepared in step II is washed with water, filtered and dried to obtain porous doped biochar.

Embodiment 2

[0033] This embodiment provides a porous doped biochar-based heavy metal / antibiotic adsorbent and a preparation method, which is basically the same as that in Embodiment 1, except that in step I, 0.5 g of thiourea is weighed instead of urea.

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Abstract

The invention relates to a porous doped charcoal-based heavy metal / antibiotic adsorbent and a preparation method thereof, provides a porous doped charcoal material for adsorbing heavy metal / antibiotic in soil and water and a preparation method thereof, and belongs to the technical field of environmental protection. The method comprises the following steps: firstly, putting waste wood blocks, mixed molten salt and a heteroatom precursor into a muffle furnace, and carrying out constant-temperature pyrolysis at 400-700 DEG C for 1-8 hours, so as to obtain the product. The method has the beneficial effects that the molten salt is molten into a liquid state at a low temperature, so that an effect of isolating air is achieved, and biomass carbonization can be realized in the muffle furnace; and secondly, the heteroatom precursor can provide heteroatoms for the biochar, so that the adsorption effect on heavy metals and antibiotics is enhanced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a porous doped biochar-based heavy metal / antibiotic adsorbent and a preparation method. Background technique [0002] Heavy metal pollution caused by industrial production is extremely toxic and non-degradable, and can be passed through the food chain through bioaccumulation, which has adverse effects on human health. Another environmental issue. [0003] The treatment methods of heavy metal and antibiotic pollution are mainly divided into: ① physical method, ② chemical method, ③ biological method. The physical method has a narrow scope of application and is generally used for the removal of insoluble or suspended pollutants; the chemical method is easily affected by chemical balance and is accompanied by secondary pollution; It has strong uniqueness, or is restricted by factors such as plant growth cycle and season, and its application is also limited. The ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/20B01J20/3078B01J20/28057B01J20/28069C02F1/283B01J2220/4825C02F2101/20C02F2101/30
Inventor 陈浮梁华根朱晨曦贾林辉盖泽嘉李沫汐桑树勋
Owner CHINA UNIV OF MINING & TECH
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