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Modified biomass ash material as well as preparation method and application thereof

A biomass ash, modification technology, applied in chemical instruments and methods, water pollutants, silicon compounds, etc., can solve the problems of reducing specific surface area and adsorption efficiency, and achieve the effect of improving adsorption effect

Pending Publication Date: 2022-04-15
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because ball milling reduces the particle size and increases the contact area with mercury, which is beneficial to the removal of mercury, but too long ball milling time will cause it to agglomerate, reducing the specific surface area and adsorption efficiency

Method used

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  • Modified biomass ash material as well as preparation method and application thereof
  • Modified biomass ash material as well as preparation method and application thereof
  • Modified biomass ash material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of modified biomass ash material, comprising the following steps:

[0048] Biomass ash and potassium hydroxide are modified according to the mass ratio of 4:1, 4:2, 4:3, 4:4, 4:6. First, make 100mL solutions of potassium hydroxide with different qualities, add biomass ash powder to each group according to the mass ratio, soak for 1h, transfer the mixture into a 50mL centrifuge tube, shake in a water bath at 100°C for 24h, take it out, and cool it down to room temperature naturally. The centrifuge tube was centrifuged at 4000rpm for 10min, filtered and separated, washed repeatedly with deionized water until neutral, and dried in an oven at 105°C to obtain alkali-modified biomass ash (MBA) with different proportions. Pass through a 100-mesh sieve and set aside.

[0049] Potassium hydroxide modification can significantly increase the effect of biomass ash on Cu 2+ 、Cd 2+ , Pb 2+ This is due to the fact that with the increase in the amount of potassiu...

Embodiment 2

[0051] The example of the present invention also provides a modified biomass ash prepared by the above-mentioned method for preparing a modified biomass ash material.

[0052] Considering the difficulty and cost of the modification method, the present invention intends to use the biomass ash taken from Anhui Guozhen Biomass Thermal Power Co., Ltd. (Fuyang) as a raw material, and modify it by the above chemical method to obtain a modified Biomass ash, to explore the changes in the properties of biomass ash under chemical modification methods, using copper, cadmium, and lead as the research objects to study their influence on the passivation effect of soil heavy metals.

[0053] 1. Determination of physical and chemical properties of modified biomass ash

[0054] (1) pH analysis

[0055] The pH of the modified MBA was measured to be 9.27 after repeated washing, and the pH of the modified biomass ash was close to that of the original biomass ash (pH=9.24). The results show that...

Embodiment 3

[0090] The example of the present invention also provides an application of the modified biomass ash described in any one of the above in the adsorption and passivation of heavy metals. The following verifications were carried out through indoor soil culture experiments at 70% water holding capacity:

[0091] (1) Soil pH measurement

[0092] Table 7 shows the change of soil pH under different addition ratios of BA and MBA. Compared with the CK group, the addition of biomass ash BA and MBA can significantly increase the soil pH value, and the increase range of pH increases with the increase of the addition amount. It can be seen from the table below that the pH of MBA is further improved after potassium hydroxide modification, and the effect of MBA on soil pH improvement is more significant under the same addition ratio.

[0093] Table 7 Changes of soil pH under different addition ratios of BA and MBA

[0094]

[0095] (Note: CK is blank for treatment; 0.1, 0.2, 0.4, and ...

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Abstract

The invention discloses a preparation method of a modified biomass ash material. The preparation method comprises the following steps: (1) weighing a certain mass of biomass ash and potassium hydroxide; (2) uniformly mixing the biomass ash and potassium hydroxide, transferring into a centrifugal tube, soaking, oscillating in a water bath, taking out, and naturally cooling to room temperature; (3) centrifuging the prepared centrifuge tube, filtering and separating, washing with deionized water, and drying to obtain alkali modified biomass ash; wherein the mass ratio of the biomass ash to the potassium hydroxide ranges from 4: 2 to 4: 5. The invention also discloses the modified biomass ash prepared by the preparation method and application of the modified biomass ash in adsorption and passivation of heavy metals. The biomass ash is modified through potassium hydroxide, the Si-O-Si number of the modified biomass ash is increased compared with that before modification, a unique structure of aluminosilicate (Ca (Al2Si2O8)) is generated, and the heavy metal adsorption effect of the biomass ash is greatly improved.

Description

technical field [0001] The invention relates to the field of resource utilization of biomass ash, in particular to a modified biomass ash material and its preparation method and application. Background technique [0002] As a traditional large agricultural country, my country's agricultural straw production has increased year by year in the past 40 years. The annual straw production is very huge. In recent years, with the continuous implementation of my country's basic national policy of saving resources and protecting the environment, biomass straw power plants have gradually replaced traditional coal-fired power plants. However, while making full use of biomass energy, new problems and challenges have emerged. The production of material ash is accumulating year by year. If it is not utilized, it may cause certain environmental problems to the soil, water body and atmospheric environment. [0003] Biomass ash has a large specific surface area and rich SiO 2 、Al 2 o 3 and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F101/20
Inventor 崔红标赵英杰李帅胡少军王昱茗鲍丙露
Owner ANHUI UNIV OF SCI & TECH