Preparing method of manganese oxide-charcoal composite adsorbent

A composite adsorption and biochar technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal compounds, etc., can solve the problem of low pollutant adsorption capacity, insufficient oxygen-containing groups on the surface, biochar Low content of mineral components and other problems, to achieve the effect of widening the suitable pH range, increasing the saturated adsorption capacity, and high adsorption performance

Inactive Publication Date: 2015-12-16
HEBEI NORMAL UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of manganese oxide and biochar composite adsorbent, the prepared adsorbent overcom

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  • Preparing method of manganese oxide-charcoal composite adsorbent
  • Preparing method of manganese oxide-charcoal composite adsorbent
  • Preparing method of manganese oxide-charcoal composite adsorbent

Examples

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[0030] Example 1

[0031] The Fraxinus mandshurica sawdust was crushed, passed through a sieve with an aperture of 0.425 mm (40 mesh), and weighed 100 g. Through preliminary experiments, it was determined that the volume of water required for equal volume impregnation was 0.55L. Weigh 14.36gKMnO 4 , Dissolved in 0.55L of water determined by the above experiment, so that the mass ratio of Mn element to biomass is 5.0%. Add the above weighed Fraxinus mandshurica sawdust, and perform pre-impregnation treatment at room temperature (about 28°C) for 8 hours, stirring 4 times in the middle. Then, it was dried in a blast oven at 105°C for 15 hours, and then transferred to a ceramic crucible with a lid, placed in a muffle furnace, and heated at 400°C for pyrolysis and carbonization for 4 hours. After cooling to room temperature, it was soaked in 300 mL of 0.1 mol / L hydrochloric acid solution at room temperature and stirred intermittently for 6 hours to obtain the manganese oxide-fraxinus...

Example Embodiment

[0034] Example 2

[0035] According to the steps in Example 1, the biomass raw material was replaced with corn stalks, and the water volume required for the isometric immersion was determined by preliminary experiments to be 0.5L. Keeping other conditions unchanged, the manganese oxide-corn stalk biochar composite can be obtained accordingly. Adsorbent and ordinary cow dung biochar adsorbent.

[0036] Similarly, the specific surface area of ​​the manganese oxide-corn stover biochar composite adsorbent measured according to the method listed in Example 1 is 33.7 m 2 / g, ash content is 21.12%, oxygen-containing group content is 2.40mmoL / g, the specific surface area of ​​ordinary corn stover biochar adsorbent is 4.4m 2 / g, ash content is 4.18%, oxygen-containing group content is 1.9mmoL / g. They are Pb 2+ The results of the adsorption isotherm and adsorption rate-pH curve are shown in the attachment figure 2 And Figure 4 . The results proved that the saturated adsorption capacity o...

Example Embodiment

[0037] Example 3

[0038] Follow the steps of Example 1 and keep other conditions unchanged. After pyrolysis and carbonization, cool to room temperature, soak in 300 mL of 0.1 mol / L hydrochloric acid solution at 60° C. and stir intermittently for 6 hours to obtain manganese oxide-scrabble Willow sawdust biochar composite adsorbent. The experimental results show that the manganese oxide-Fraxinus mandshurica sawdust biochar composite material has an effect on Pb 2+ The saturated adsorption capacity is 100.0mg / g, which is lower than the post-treatment adsorption capacity at room temperature.

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Abstract

The invention discloses a preparing method of a manganese oxide-charcoal composite adsorbent, which comprises following steps: (1) air-drying or drying a biomass raw material, pulverizing into powder and uniformly mixing for standby; (2) taking potassium permanganate or sodium permanganate as a pre-treating agent, and performing pretreatment on the biomass raw material by adopting an equivalent-volume impregnation method; (3) drying, pyrolyzing and carbonizing the pretreated material to prepare the composite adsorbent material; (4) soaking the obtained composite adsorbent material with inorganic acid, and washing and drying to obtain the manganese oxide-charcoal composite adsorbent finished product. The method is simple, the prepared composite adsorbent is suitable for an adsorption method as an adsorbent for treating heavy metal ion-containing waste water, and has an advantage in the aspect of treating the acid heavy metal ion waste water particularly. The adsorbent can also serve as a conditioner for soil polluted by heavy metal ions, and achieves an action of controlling the absorption of plants to heavy metal ions by adsorbing the heavy ion ions after being applied into the soil.

Description

technical field [0001] The invention relates to a biological carbon adsorbent, in particular to a preparation method of a stable manganese oxide and biochar composite adsorbent with high manganese oxide content, which belongs to the high-value comprehensive utilization technology of agricultural and forestry biomass waste. Background technique [0002] Every year, my country produces more than 800 million tons of biomass waste such as straw, residual branches, and sawdust through the field of agricultural and forestry production, accounting for about 30% of the world's total biomass waste, ranking first in the world. In the face of such huge resources, large-scale reasonable, efficient and high-value utilization has not yet been realized, and traditional utilization methods are the main method. The current treatment methods mainly include five utilization methods: fertilizer, feed, base material, fuel, and raw material, among which fertilizer, feed, and base material belong ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30
Inventor 杜霞赵明静马子川邢胜涛郭萌宋翥达
Owner HEBEI NORMAL UNIV
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