Supported biochar functional material for adsorbing heavy metal ions, preparation and applications thereof

A technology for adsorbing heavy metals and functional materials, applied in the field of loaded biochar functional materials, can solve the problems of low adsorption affinity and poor adsorption performance of heavy metals, and achieve the effects of high adsorption saturation, enhanced adsorption performance, and strong cation exchange performance

Inactive Publication Date: 2019-12-13
TSINGHUA UNIV
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Problems solved by technology

[0003] As a broad-spectrum adsorption carbon material, traditional biochar has low adsorption affinity for heavy metals

Method used

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  • Supported biochar functional material for adsorbing heavy metal ions, preparation and applications thereof
  • Supported biochar functional material for adsorbing heavy metal ions, preparation and applications thereof
  • Supported biochar functional material for adsorbing heavy metal ions, preparation and applications thereof

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Embodiment Construction

[0024] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0025] A method for preparing a phosphate / magnesium salt-loaded biochar functional material that adsorbs heavy metal ions, taking plant straw biomass as an example, the preparation method includes the following steps:

[0026] In step (1), the plant straw biomass crushed through a 0.425 mm sieve is added to the mixed solution of potassium dihydrogen phosphate / magnesium chloride hexahydrate at a solid-to-liquid ratio of 1:10 (g:mL), and in the mixed solution, The concentrations of potassium dihydrogen phosphate and magnesium chloride hexahydrate are both 1 mol / L.

[0027] Ultrasonic mixing for 10 minutes, then placed in a constant temperature shaker with the rotation speed and temperature set at 200rpm and 25°C respectively, the shaking time was 24h, after centrifugal filtration, the biomass was washed until the pH was neutral, and finally dried ...

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Abstract

The invention discloses a supported biochar functional material and a preparation method thereof. The supported biochar functional material comprises a biomass and an inorganic salt loaded on the surface of the biomass; the biomass comprises a plant material; the inorganic salt comprises a phosphate and a magnesium salt. The preparation principle of the material is that complexation and precipitation of heavy metals, polar functional groups and mineral components are induced, so that the bio-availability of the heavy metals is reduced. The preparation method comprises the following steps: adding the biomass into a mixed solution of the phosphate and the magnesium salt, carrying out mixing reaction, washing with water, drying, and carrying out high-temperature carbonization in an oxygen-free environment to obtain the supported biochar functional material. Due to polar functional groups, mineral components and cation exchange performance of the supported biochar functional material, theperformance on adsorbing heavy metals lead, cadmium and copper in water body is improved by 2-16 times, and the supported biochar functional material has a wide application prospect in the field of heavy metal polluted water body purification.

Description

technical field [0001] The invention belongs to the technical field of water treatment materials, in particular to a loaded biochar functional material for absorbing heavy metal ions and its preparation and application. Background technique [0002] With the rapid development of heavy metal mining and smelting industry, lead battery manufacturing industry, electroplating equipment manufacturing industry, tanneries and other industries, more and more heavy metal wastewater is directly or indirectly discharged into the environment, resulting in a decline in regional environmental quality. Since heavy metals are non-biodegradable and gradually accumulate in organisms, the reduction or removal of heavy metals from wastewater is a prerequisite for pollution avoidance. Adsorption is widely used in pollution control projects due to its advantages of simple operation, low cost and high removal efficiency. Due to its large specific surface area and porous structure, the rich polar f...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J20/32C02F1/28C02F101/20
CPCB01J20/20B01J20/3078B01J20/3236B01J2220/4825C02F1/288C02F2101/20
Inventor 李广贺苗秋慈张旭张芳张昊
Owner TSINGHUA UNIV
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