CN104984734A - Production method for hydrothermal bamboo based biomass carbon adsorption material catalyzed by inorganic strong acid - Google Patents

Abstract

The invention discloses a production method of an inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material. The steps include: crushing the bamboo powder processing residue into 60-80 mesh bamboo powder, and then treating the bamboo powder under strong acidic conditions. The hydrothermal reaction is carried out to prepare the hydrothermal bamboo charcoal; the activated hydrothermal bamboo charcoal adsorption material is obtained after the hydrothermal bamboo charcoal obtained above is activated with an inorganic alkali. The invention has the advantages of simple process, low raw material cost and large adsorption capacity. The adsorption material prepared by the method can be applied to the adsorption and treatment of cationic dyes, and has good treatment effect. The invention not only realizes the recycling and utilization of bamboo processing residue resources, but also obtains a cheap and efficient novel adsorbent, and promotes the development of environmental protection.

Description

A kind of production method of inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material

technical field

The invention belongs to the field of preparation of biomass charcoal adsorption materials and environmental pollution control, in particular to a production method of using bamboo powder as the main material to carry out hydrothermal carbonization to prepare biomass adsorption materials, specifically inorganic strong acid catalyzed hydrothermal bamboo-based biomass charcoal Methods of production of adsorbent materials.

Background technique

Statistics from the Eighth National Forest Resources Inventory show that my country's bamboo forest area is 6.01 million hectares, and the bamboo forest area, bamboo stock, bamboo product output and export volume all rank first in the world, and bamboo processing technology and bamboo product innovation capabilities are at the world's advanced level. However, at present, the utilization rate of bamboo resources in my country is on the low side, and the primary utilization rate is 20%-50%. Trail bamboo. Therefore, there is an urgent need to develop clean and efficient resource utilization technologies for agricultural and forestry waste.

Contents of the invention

The object of the present invention is to provide a production method of inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material with good adsorption performance.

The technical scheme adopted to solve the above-mentioned technical problems is:

A kind of production method of inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material is carried out according to the following steps:

(1) raw materials including bamboo chips, bamboo slices, scraps, bamboo silk are pulverized into 60-80 order bamboo powder;

(2) Preparation of hydrothermal bamboo charcoal: 60 parts by weight of 60-80 mesh bamboo powder and 6-24 parts by weight of inorganic strong acid are placed in 200-300 parts by weight of water, stirred and mixed at room temperature In a stainless steel reaction kettle lined with ethylene, react at 180-240°C for 6-24 hours, cool naturally, filter with suction, wash until neutral and then dry to obtain hydrothermal bamboo charcoal;

(3) Preparation of activated hydrothermal bamboo charcoal: mix the hydrothermal bamboo charcoal obtained in step (2) with 2.5-6 parts by weight of inorganic alkali and 200-300 parts by weight of water, stir at room temperature for 0.5-3h, then suction filter and wash until neutral Then dry.

The production method of the described inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material, the inorganic strong acid mentioned in the step (2) is any one of concentrated hydrochloric acid or concentrated sulfuric acid or a mixture of two strong acids.

In the production method of the inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material, the inorganic base described in step (3) is either sodium hydroxide, potassium hydroxide or a mixture of two inorganic bases.

The invention adopts strong inorganic acid as the catalyst of hydrothermal carbonization, so that the degree of carbonization of bamboo powder is increased and the density of carbonization products is reduced. Compared with the corresponding bamboo-based biochar prepared without catalyst, the prepared bamboo-based biochar adsorption material has a significantly higher adsorption capacity for the cationic dye methylene blue, and the adsorption capacity for the cationic dye methylene blue can reach more than 540mg/g. 400mg/L methylene blue, when the solid-to-liquid ratio is 0.8g/L, the decolorization rate (removal rate) can reach more than 99.8%, while the corresponding bamboo-based biochar prepared without catalyst has a saturated adsorption capacity of methylene blue only 288mg/g . Modification of bamboo processing residues and environmental pollutants into hydrothermal bamboo charcoal adsorption materials with high adsorption rate has good adsorption performance for cationic dyes, which is conducive to application in industrial wastewater treatment and other fields, and turns waste into treasure. Greatly increased the added value of bamboo powder.

Description of drawings

Fig. 1 is the isotherm adsorption line graph of the sample obtained in Example 1 of the present invention to methylene blue.

Fig. 2 is a graph of the decolorization rate of methylene blue by the sample obtained in Example 1 of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments.

Table 1 Embodiment 1-8 raw material proportioning (weight part)

Embodiment 1 (corresponding embodiment 1 and the proportioning value by weight in contrasting table above), prepare as follows according to the following steps:

(1) Grinding bamboo chips, bamboo chips, leftovers, bamboo silk, etc. into 60-80 meshes;

(2) Preparation of hydrothermal bamboo charcoal: the 60-80 mesh bamboo powder of 60 parts by weight and the concentration of 21 parts by weight of 37% concentrated hydrochloric acid are placed in 220 parts by weight of water, stirred and mixed evenly at room temperature and then placed in a polytetrafluoroethylene In a stainless steel reaction kettle lined with ethylene, react at 200°C for 15 hours, cool naturally, filter with suction, wash until neutral, and then dry to obtain hydrothermal bamboo charcoal;

(3) Preparation of activated hydrothermal bamboo charcoal: mix the hydrothermal bamboo charcoal obtained in step (2) with 3.6 parts by weight of sodium hydroxide and 240 parts by weight of water, stir at room temperature for 2 hours, suction filter, wash until neutral, and then dry.

It should be noted that embodiment 1 is the best embodiment, and all the other embodiments 2-8 are made by the same method as embodiment 1 according to the raw materials and proportioning values of the corresponding embodiments in each comparison table.

Now taking the sample obtained in Example 1 as an example, the adsorption of methylene blue is shown in Figure 1. Fig. 1 is the amount of methylene blue adsorbed by the sample obtained in Example 1 of the present invention at room temperature. When in equilibrium, the adsorption capacity is plotted against the equilibrium concentration, and the isotherm adsorption line obtained. The adsorption capacity in the figure represents the adsorption capacity of methylene blue per gram of adsorbent. quantity. Fig. 2 is a diagram of the decolorization rate of the sample obtained in Example 1 of the present invention to methylene blue at room temperature, the initial concentration of methylene blue is 400 mg/L, and the volume is 50 ml.

The present invention uses bamboo powder as a raw material to crush sawn bamboo chips, bamboo slices, scraps, bamboo shreds, etc. from the original waste into 60-80 mesh powder, which is not only beneficial to stacking, but also enables more sufficient reaction and better effect .

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (3)

1. a kind of production method of inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material is characterized in that, carries out according to the following steps: (1) raw materials including bamboo chips, bamboo slices, scraps, bamboo silk are pulverized into 60-80 order bamboo powder; (2) Preparation of hydrothermal bamboo charcoal: 60 parts by weight of 60-80 mesh bamboo powder and 6-24 parts by weight of inorganic strong acid are placed in 200-300 parts by weight of water, stirred and mixed at room temperature In a stainless steel reaction kettle lined with ethylene, react at 180-240°C for 6-24 hours, cool naturally, filter with suction, wash until neutral and then dry to obtain hydrothermal bamboo charcoal; (3) Preparation of activated hydrothermal bamboo charcoal: mix the hydrothermal bamboo charcoal obtained in step (2) with 2.5-6 parts by weight of inorganic alkali and 200-300 parts by weight of water, stir at room temperature for 0.5-3h, then suction filter and wash until neutral Then dry. 2. the production method of inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material as claimed in claim 1, is characterized in that, said inorganic strong acid in step (2) is any one or both in the concentrated hydrochloric acid or the concentrated sulfuric acid A mixture of strong acids. 3. the production method of inorganic strong acid catalyzed hydrothermal bamboo-based biomass carbon adsorption material as claimed in claim 1, is characterized in that, the inorganic base described in step (3) is any one of sodium hydroxide, potassium hydroxide or A mixture of two inorganic bases.