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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
  • Description
  • Claims
  • Application Information

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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 overcomes the low content of biochar mineral components, insufficient oxygen-containing groups on the surface, and low adsorption capacity for pollutants. insufficient

Method used

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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

Experimental program
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Embodiment 1

[0031] Crush the ash wood chips, pass through a sieve with a pore size of 0.425 mm (40 mesh), weigh 100 g, and determine through preliminary experiments that the volume of water required for equal-volume immersion is 0.55 L. 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 was 5.0%. Add the ash wood chips weighed above, and carry out pre-dipping treatment at room temperature (about 28°C), and keep the time for 8 hours, stirring 4 times in the middle. Then, it was dried at 105°C for 15 hours in a blast thermostat, and then transferred to a covered ceramic crucible, placed in a muffle furnace, and heated at 400°C for pyrolysis and carbonization for 4 hours. After cooling to room temperature, soak in 300 mL of 0.1 mol / L hydrochloric acid solution at room temperature and stir intermittently for 6 hours to obtain the manganese oxide-Ash sawdust biochar composite adsorbent. Replace KMnO with the sa...

Embodiment 2

[0035] According to the steps in Example 1, the biomass raw material is replaced by corn stalks, and the water volume required for equal volume impregnation is determined to be 0.5 L through preliminary experiments, and other conditions are kept unchanged, and 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 stalk biochar composite adsorbent measured by the method listed in Example 1 is 33.7m 2 / g, the ash content is 21.12%, the amount of oxygen-containing groups is 2.40mmoL / g, and the specific surface area of ​​ordinary corn straw biochar adsorbent is 4.4m 2 / g, the ash content is 4.18%, and the amount of oxygen-containing groups is 1.9mmoL / g. They are to Pb 2+ The results of the adsorption isotherm and adsorption rate-pH curve are shown in the appendix respectively. figure 2 And attached Figure 4 . The results prov...

Embodiment 3

[0038] According to the steps of Example 1, keeping other conditions unchanged, after pyrolysis and carbonization, cool to room temperature, soak with 300mL of 0.1mol / L hydrochloric acid solution at 60°C and stir intermittently for 6 hours to obtain manganese oxide-water koji Willow sawdust biochar composite adsorbent. The experimental results show that the manganese oxide-Ash sawdust biochar composite material is resistant to Pb at 60℃. 2+ The saturated adsorption capacity is 100.0 mg / 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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