CN113000024A - Method for preparing biochar material by using tea leaves and application of biochar material in pesticide adsorption - Google Patents
Method for preparing biochar material by using tea leaves and application of biochar material in pesticide adsorption Download PDFInfo
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- CN113000024A CN113000024A CN202110240382.5A CN202110240382A CN113000024A CN 113000024 A CN113000024 A CN 113000024A CN 202110240382 A CN202110240382 A CN 202110240382A CN 113000024 A CN113000024 A CN 113000024A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/20—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to the conditioning of the sorbent material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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Abstract
The invention discloses a method for preparing a biochar material by using tea leaves and application of the biochar material in pesticide adsorption, wherein the preparation method comprises the following steps: (1) taking tea leaves as a raw material, drying the tea leaves, then crushing the tea leaves, and screening the materials obtained by crushing to obtain pretreated tea leaves; (2) performing pyrolysis treatment on the pretreated tea leaves at 650-750 ℃ for 110-130 min, wherein protective gas is continuously introduced in the pyrolysis treatment process to ensure that the pretreated tea leaves are pyrolyzed in the protective gas atmosphere, and cooling the material to obtain a pyrolyzed material; (3) grinding the pyrolysis material to obtain a tea residue biochar material; the tea residue biochar material has the characteristics of simplicity and convenience in synthesis, simple raw material source, low price, greenness, environmental friendliness, large specific surface area, high social and economic benefits and strong adsorption force; meanwhile, the application of the tea residue waste is expanded, and a theoretical basis and a technical support are provided for resource utilization of the tea residue.
Description
Technical Field
The invention relates to the technical field of adsorption materials, in particular to a method for preparing a biochar material by using tea leaves and application of the biochar material in pesticide adsorption.
Background
Tea trees are one of the important economic crops in China, and Fujian is one of the main tea-producing provinces in China. According to statistics, the annual consumption of domestic tea in 2019 reaches 202.56 ten thousand tons, the annual consumption is increased by 11.50 ten thousand tons compared with 2018, the increase is 6.02%, the proportion of waste generated by tea processing is gradually increased, a large amount of tea branches, tea stalks, tea ash, tea leaves and the like are accumulated in the production process, so that the waste of resources is caused, and the treatment cost and the environmental pollution are increased. The biochar prepared by using the tea leaves can recycle resources, so that the aim of changing waste into valuable is fulfilled, and the sustainable development of the environment is met.
Tea leaves contain a large amount of organic carbon, nitrogen sources and various antioxidant substances, people generally use the tea leaves in fertilizers and feeds to improve the quality of products, and moreover, the results show that the extraction effect of alkaline protease and compound protease is better when researching the process for extracting protein in the tea leaves by a protease method. The method for preparing the biochar by using the tea leaves is a novel treatment method.
The biochar is a solid residue obtained by heat treatment of biomass rich in carbon organic matters at a certain temperature (300-700 ℃) under an anaerobic or anoxic condition. The biomass charcoal is generally alkaline, the pH value is 7.0-10, the higher the cracking temperature is, the higher the pH value is, and a certain amount of ash is generated in the pyrolysis process. The composition and structure of the biochar are related to the preparation temperature, and the structural pore diameter is thinner as the temperature is higher; the biochar has a developed pore structure, good adsorption performance and an increased specific surface area, and is beneficial to adsorbing pesticides and reducing pesticide residues; after the biochar contacts air, partial oxygen-containing functional groups are formed, so that the ion exchange capacity is enhanced, and the adsorption capacity is improved. However, the current research on preparing the biochar from the tea leaves has little attention on improving pesticide residues, and particularly, the adsorption of bispyribac-sodium is less reported.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a biochar material from tea leaves, which is reliable in implementation, low in cost and capable of recycling tea leaf waste materials, and an application of the method in pesticide adsorption.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a method for preparing a biochar material by using tea leaves comprises the following steps:
(1) taking tea leaves as a raw material, drying the tea leaves, then crushing the tea leaves, and screening the materials obtained by crushing to obtain pretreated tea leaves;
(2) performing pyrolysis treatment on the pretreated tea leaves at 650-750 ℃ for 110-130 min, wherein protective gas is continuously introduced in the pyrolysis treatment process to ensure that the pretreated tea leaves are pyrolyzed in the protective gas atmosphere, and cooling the material to obtain a pyrolyzed material;
(3) and grinding the pyrolysis material to obtain the tea residue biochar material.
As a possible implementation manner, further, in the step (1), the tea leaves are crushed by a crusher, and the crushed material is sieved by a 60-mesh sieve to obtain the pre-treated tea leaves.
As a possible implementation mode, further, in the step (2), the pretreated tea leaves are placed in a corundum pan and then placed in a tubular furnace for pyrolysis treatment.
As a preferable implementation option, in the step (2), the pyrolysis treatment temperature of the pretreated tea leaves is 700 ℃, and the pyrolysis treatment time is 120 min.
As a preferred implementation option, the protective gas is preferably nitrogen.
As a better implementation choice, youOptionally, in the step (3), the specific surface area of the prepared tea residue biochar material is 5.35m2/g。
Based on the preparation method, the invention also provides the application of the tea residue biochar material prepared based on the method in pesticide adsorption.
As a possible embodiment, further, the pesticide contains bispyribac-sodium.
As a better implementation choice, the content of the bispyribac-sodium is preferably 100 mg/L.
As a better implementation choice, the adsorption quantity of the tea residue biochar material to the bispyribac-sodium is preferably 3.13 mg/g.
Because the tea leaves in China have large yield, various varieties and wide application range, the tea leaves contain a large amount of cellulose, protein, amino acid, tea polyphenol, trace elements and other components, and the tea leaves are widely applied to the aspects of fertilizer, feed, daily life such as pillow core manufacture and the like. Currently, researches on preparing the biochar from the tea leaves have little attention on improving pesticide residues, and particularly, the adsorption of bispyribac-sodium is less reported.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that:
1. the tea residue biochar material prepared by the scheme has a certain adsorption effect on herbicide, and the adsorption amount is 3.13mg/g through verification;
2. the tea residue biochar material has the characteristics of simplicity and convenience in synthesis, simple raw material source, low price, greenness, environmental friendliness, large specific surface area, high social and economic benefits and strong adsorption force;
3. the scheme expands the application of the tea residue waste and provides theoretical basis and technical support for the treatment method and resource utilization of the tea residue in the future.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram showing that the prepared tea residue biochar is not ground and is ground after being washed with water, wherein (a) is in a state before being ground and (b) is in a state after being ground;
FIG. 2 is a representation diagram of X-ray powder diffraction analysis and scanning electron microscope imaging of the tea residue biochar prepared by the scheme.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Similarly, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Preparation of tea residue biochar material
A method for preparing a biochar material by using tea leaves comprises the following steps:
(1) taking tea leaves as a raw material for preparing the biochar, drying, crushing by a crusher, sieving by a 60-mesh sieve, and keeping dry to obtain pretreated tea leaves;
(2) placing the dried pretreated tea residue in a corundum pan, placing the corundum pan in a tubular furnace, and continuously introducing N at 700 DEG C2Performing pyrolysis treatment for 120min under the conditions of (a) to obtain a pyrolysis material, which is shown in fig. 1(a) after cooling;
(3) grinding the pyrolysis material to obtain tea residue biochar material (shown in figure 1 (b)), and storing in a dryer for use.
Material characterization
The crystal form of the prepared tea residue biochar material is characterized by X-ray powder diffraction, the result shows that the prepared biochar is in an amorphous state (figure 2a), the appearance of the biochar is observed by using SEM (scanning Electron microscope), and the result shows that the surface of the tea residue biochar generates a pore structure and is in a certain folded strip shape(FIG. 2 b). The specific surface area of the tea residue biochar prepared by BET determination is 5.35m2/g。
Adsorption test of tea residue biochar material on bispyribac-sodium
(1) 100mL of bispyribac-sodium solution of 100mg/L is prepared as mother solution;
(2) weighing 0.05g of the prepared tea residue biochar material, adding the tea residue biochar material into the solution, and stirring at normal temperature in a magnetic stirrer;
(3) the solution was filtered through a 2ml syringe and a 0.22 μm aqueous needle;
(4) the resulting 2mL solution was diluted to 20mg/L, and absorbance at different time points was measured by an ultraviolet spectrophotometer (UV-Vis) and repeated three times to obtain an average value.
(5) The measured value is taken into a standard curve to be converted into corresponding concentration, and the adsorption amount is calculated.
The determination shows that the prepared biochar has a good adsorption effect on bispyribac-sodium, the removal rate is 2.23%, and the adsorption quantity is 3.13 mg/g.
The above description is only a part of the embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the present invention through the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for preparing a biochar material by using tea leaves is characterized by comprising the following steps:
(1) taking tea leaves as a raw material, drying the tea leaves, then crushing the tea leaves, and screening the materials obtained by crushing to obtain pretreated tea leaves;
(2) performing pyrolysis treatment on the pretreated tea leaves at 650-750 ℃ for 110-130 min, wherein protective gas is continuously introduced in the pyrolysis treatment process to ensure that the pretreated tea leaves are pyrolyzed in the protective gas atmosphere, and cooling the material to obtain a pyrolyzed material;
(3) and grinding the pyrolysis material to obtain the tea residue biochar material.
2. The method for preparing biochar material from tea leaves as claimed in claim 1, wherein in the step (1), the tea leaves are pulverized by a pulverizer, and the pulverized material is sieved by a 60-mesh sieve to obtain the pretreated tea leaves.
3. The method for preparing biochar material from tea leaves according to claim 1, wherein in the step (2), the pretreated tea leaves are placed in a corundum pan and then placed in a tube furnace for pyrolysis treatment.
4. The method for preparing biochar material from tea leaves as claimed in claim 3, wherein in the step (2), the pyrolysis treatment temperature of the pre-treated tea leaves is 700 ℃ and the pyrolysis treatment time is 120 min.
5. The method for preparing biochar material from tea leaves as claimed in claim 3, wherein the shielding gas is nitrogen.
6. The method for preparing biochar material from tea leaves as claimed in any one of claims 1 to 5, wherein the specific surface area of the prepared tea leaf residue biochar material in step (3) is 5.35m2/g。
7. Use of the tea residue biochar material prepared by the method according to one of claims 1 to 6 in pesticide adsorption.
8. The use as claimed in claim 7 wherein the pesticide comprises bispyribac-sodium.
9. The use as claimed in claim 8, wherein the bispyribac-sodium is present in an amount of 100 mg/L.
10. The use as claimed in claim 9, wherein the tea residue biochar material has an adsorption capacity of bispyribac-sodium of 3.13 mg/g.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943029A (en) * | 2021-09-28 | 2022-01-18 | 北京农学院 | Application of coffee residue biochar in pyrethroid pesticides in enriched water body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841495A (en) * | 2020-07-13 | 2020-10-30 | 安徽农业大学 | Preparation method of porous tea residue biochar with high specific surface area |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841495A (en) * | 2020-07-13 | 2020-10-30 | 安徽农业大学 | Preparation method of porous tea residue biochar with high specific surface area |
Non-Patent Citations (2)
| Title |
|---|
| NEHA SHARMA等: ""In-vitro evaluation of rice straw biochars’ effect on ispyribac-sodium dissipation and microbial activity in soil"", 《ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY》 * |
| 陈华泉等: ""茶渣活性炭的制备及其对亚甲基蓝的吸附性能研究"", 《应用化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943029A (en) * | 2021-09-28 | 2022-01-18 | 北京农学院 | Application of coffee residue biochar in pyrethroid pesticides in enriched water body |
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