CN103213982A - Method for preparing activated carbon by carrying out microwave irradiation on banana straws - Google Patents

Method for preparing activated carbon by carrying out microwave irradiation on banana straws Download PDF

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Publication number
CN103213982A
CN103213982A CN2013101534942A CN201310153494A CN103213982A CN 103213982 A CN103213982 A CN 103213982A CN 2013101534942 A CN2013101534942 A CN 2013101534942A CN 201310153494 A CN201310153494 A CN 201310153494A CN 103213982 A CN103213982 A CN 103213982A
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China
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stem stalk
banana stem
activated carbon
active carbon
quality
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CN2013101534942A
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CN103213982B (en
Inventor
黄福川
粟满荣
卢朝霞
莫宇飞
梁景
唐兴中
蓝明新
肖友程
李胜
梁慧
唐彩珍
田宗义
李宏君
赵钟兴
唐丹葵
刘琨
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Guangxi University
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Guangxi University
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Abstract

The invention discloses a method for preparing activated carbon by carrying out microwave irradiation on banana straws. The method comprises the steps of: cutting air-dried banana straws into small sections, soaking with zinc chloride/calcium chloride mixing solution, fishing up and drying without water drops, performing microwave irradiation, soaking with acid solution, taking out for draining, bleaching with deionized water and drying, cooling to room temperature, and crushing to obtain activated carbon. The activated carbon prepared by using the method achieves the methylthionine chloride decolorizing capacity of 16-25mL/0.1g which is greatly higher than that of the national standard high-quality activated carbon. Furthermore, wastes of agricultural products are utilized, so that the added value of the agricultural products can be improved, the environment protection pressure can be effectively reduced, and the method is simple in technique, short in flow and favorable for popularization.

Description

Microwave exposure banana stem stalk prepares process of active carbon
Technical field
The present invention relates to a kind of microwave exposure banana stem stalk and prepare process of active carbon.
Background technology
Banana is a kind of crucial subtropical fruit, has special economic worth.After the annual results banana, the stem stalk of banana just becomes waste material.Because any of several broadleaf plants stem stalk fiber is long, contains large quantity of moisture, and is not perishable, composing environment pollutes.How banana stem stalk waste material is carried out comprehensive exploitation, to improve the added value of farm crop, be the problem that a lot of researchists inquire into always.
Gac has flourishing pore texture, because huge surface-area and good absorption property are arranged, at a lot of industrial sphere of lifes, is used widely, and progressively comes into daily life.See that theoretically any carbonaceous material can be as the gac raw material, still because there are very big difference in raw material and production technique, industrial main preparation raw material is a superpolymer.Along with the activated carbon application scope constantly enlarges, not only need cheap, the general greatly and widely gac of consumption, also need high quality, possess the gac of special purpose, also require the production exploitation of gac to develop to energy-conservation, efficient and environmental protection direction, gac has huge development potentiality.
On the industrial production, the selection of raw material is extremely important.Should consider raw material taste, consider that again can raw material supply satisfy industrialized needs, also should consider its economic benefit.Present most of shell and agriculture and forestry organic waste material often are dropped the field, or are burned and cause topsoil, and this not only destroys ecotope, and has wasted operational resource, and is unfavorable to China's sustained economic development.Therefore, need constantly to seek the new raw material sources of gac, inquire into novel process, increase new variety, enlarge the Application of Brand Active Carbon field.
The microwave exposure technology is applied in preparation gac field.It is by heated object internal dipole molecule high frequency reciprocation force, produce internal friction heat and make and be heated the material temperature and raise, must any heat transfer process, just material inside and outside portion is heated simultaneously, heat up simultaneously, rate of heating is fast, evenly, only needs the part or 1/tens heats of traditional heating mode just can reach heating purposes.Based on the characteristics of microwave heating, the present invention utilizes banana stem stalk production gac both quick, energy-conservation in the hope of reaching the Preparation of Activated Carbon of applied microwave technology in banana stem stalk, is more convenient for realizing automatization control.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of microwave exposure banana stem stalk and prepares process of active carbon, to reduce environmental pollution, low-carbon emission, improves the added value of agricultural byproducts, is beneficial to sustained economic development.
The present invention solves the problems of the technologies described above with following technical scheme:
Step of preparation process:
1. get air-dry banana stem stalk, drying is cut to the segment of length 3-5cm, and with volumetric ratio 6-8 zinc chloride/calcium chloride mixed liquid dipping doubly, soaking temperature is controlled at 40-50 ℃, and the time is 40-48h;
2. take out dry drip to nothing after, put into crucible and carry out microwave exposure, irradiation power is 750w-1000w, the time is 25-40 minute;
3. after being cooled to room temperature, with the dilute hydrochloric acid immersion 1-4h of mass concentration 2-5%;
4. after taking-up drains, use washed with de-ionized water, making its pH value is 7;
5. with the material rebake 3-5h that obtains, temperature is controlled at 110-120 ℃;
6. be cooled to room temperature, obtain Powdered Activated Carbon.
After the raw material banana stem stalk natural wind dry doubling drying, require to reach following quality index: quality is than moisture≤12%; Quality is than volatility≤70%; Quality is than fixed carbon 〉=15%; Quality is than ash content≤3%.
Soaking the used volumetric molar concentration of banana stem stalk is zinc chloride 3mol/L, and calcium chloride is 1mol/L.
The zinc chloride quality that requires to soak banana stem stalk is than purity 〉=90%, and the calcium chloride quality is than purity 〉=95%; In the time of zinc chloride and calcium chloride mixed liquid dipping banana stem stalk, each stirs once when 12h and 36h, each 3-5 minute.
The active carbon finished products of making, iodine sorption value reach the standard-required of GB/T12496.8-1999, and methylene blue adsorption value reaches the technical requirements of GB/T12491.10-1999.
Prepare gac with method of the present invention, the gac of gained is much higher than the national standard high grade activated carbon at methylene blue decolorizing ability 16-25mL/0.1g.And utilized the waste of agricultural-food, and improve additional value of farm products, effectively reduce the pressure of protection environment, and technology is simpler, flow process is short, is beneficial to popularization.
Embodiment
The present invention is the compound method of making powdered carbon that banana stem stalk is soaked of the inner heating of a kind of microwave exposure, application zinc chloride and calcium chloride solution.Characteristics of the present invention be quick, energy-conservation, be convenient to automatization control, overcome substantially that traditional efficiency of utilization when only using zinc chloride process is low, labour intensity big, the problem of work under bad environment, blowdown wretched insufficiency; The method of the Activated Carbon Production of be that a kind of technical requirements is low, high production, disposal of pollutants are less, simultaneously, also for solving banana waste material outlet, improving comprehensive benefit a kind of new approach is provided.
The present invention proposes to utilize banana stem stalk to be raw material, utilizes fuzzy stratification to control and produces the activated carbon process parameter, produces gac with the single stage method carbonization, and the gac of making meets national technical standard.
Embodiment 1:
Embodiment 2:
Embodiment 3:
The leading indicator of the activated carbon product of embodiment 1 is:
CTC adsorptive value (%) 100-140%
Benzene absorption (%) 45-65%
Iodine sorption value (mg/g) 1100-1300
Specific surface area (m 2/g) 1400-2400
Apparent density (g/ml) 0.33-0.38
Point of ignition (℃) 400-450
Intensity (%) 95-99.9%
Ash content (%) 3-6
Moisture is less than (%) 5
Granularity (mesh) scope 1-4mm

Claims (5)

1. a microwave exposure banana stem stalk prepares process of active carbon, it is characterized in that step of preparation process is:
⑴ get air-dry banana stem stalk, and drying is cut to the segment of length 3-5cm, and with volumetric ratio 6-8 zinc chloride/calcium chloride mixed liquid dipping doubly, soaking temperature is controlled at 40-50 ℃, and the time is 40-48h;
Take out dry drip to nothing after, put into crucible and carry out microwave exposure, irradiation power is 750w-1000w, the time is 25-40 minute;
⑶ after be cooled to room temperature, with the dilute hydrochloric acid immersion 1-4h of volumetric concentration 2-5%;
⑷ use washed with de-ionized water after taking out and draining, and making its pH value is 7;
⑸ with the material rebake 3-5h that obtains, and temperature is controlled at 110-120 ℃;
⑹ be cooled to room temperature, obtains Powdered Activated Carbon.
2. microwave exposure banana stem stalk as claimed in claim 1 prepares process of active carbon, it is characterized in that raw material banana stem stalk natural wind dry doubling drying after, require to reach following quality index: quality is than moisture≤12%; Quality is than volatility≤70%; Quality is than fixed carbon 〉=15%; Quality is than ash content≤3%.
3. microwave exposure banana stem stalk as claimed in claim 1 prepares process of active carbon, and it is characterized in that soaking the used volumetric molar concentration of banana stem stalk is zinc chloride 3mol/L, and calcium chloride is 1mol/L.
4. microwave exposure banana stem stalk as claimed in claim 1 prepares process of active carbon, it is characterized in that zinc chloride purity 〉=90% of requirement immersion banana stem stalk, calcium chloride purity 〉=95%; In the time of zinc chloride and calcium chloride mixed liquid dipping banana stem stalk, each stirs once when 12h and 36h, each 3-5 minute.
5. microwave exposure banana stem stalk as claimed in claim 1 prepares process of active carbon, it is characterized in that the active carbon finished products made, iodine sorption value reaches the standard-required of GB/T12496.8-1999, and methylene blue adsorption value reaches the technical requirements of GB/T12491.10-1999.
CN201310153494.2A 2013-04-28 2013-04-28 Method for preparing activated carbon by carrying out microwave irradiation on banana straws Active CN103213982B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103922433A (en) * 2014-03-13 2014-07-16 北京工业大学 Method for removing reactive brilliant blue KN-R dye in waste water by using walnut shell biomass charcoal adsorbent
CN104724703A (en) * 2015-03-20 2015-06-24 福州大学 Method for preparing adsorptive activated carbon from Musaceae plants
CN107262030A (en) * 2017-06-28 2017-10-20 桂林理工大学 A kind of preparation method of modified banana stalk biomass carbon
CN108033447A (en) * 2017-12-07 2018-05-15 吉林大学 Preparation method, multiporous biological matter carbon and the application of multiporous biological matter carbon
CN108940202A (en) * 2018-08-02 2018-12-07 广东石油化工学院 Application of the banana stem active carbon in absorption Amoxicillin

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101289183A (en) * 2008-06-04 2008-10-22 天津大学 Method for preparing starch based active carbon microballoons with high specific surface area
CN102826548A (en) * 2012-09-26 2012-12-19 玉林师范学院 Banana tree base activated carbon and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101289183A (en) * 2008-06-04 2008-10-22 天津大学 Method for preparing starch based active carbon microballoons with high specific surface area
CN102826548A (en) * 2012-09-26 2012-12-19 玉林师范学院 Banana tree base activated carbon and preparation method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103922433A (en) * 2014-03-13 2014-07-16 北京工业大学 Method for removing reactive brilliant blue KN-R dye in waste water by using walnut shell biomass charcoal adsorbent
CN103922433B (en) * 2014-03-13 2016-01-20 北京工业大学 The method of Reactive Brilliant Blue KN-R dyestuff in waste water removed by a kind of nut-shell biomass charcoal sorbent material
CN104724703A (en) * 2015-03-20 2015-06-24 福州大学 Method for preparing adsorptive activated carbon from Musaceae plants
CN107262030A (en) * 2017-06-28 2017-10-20 桂林理工大学 A kind of preparation method of modified banana stalk biomass carbon
CN108033447A (en) * 2017-12-07 2018-05-15 吉林大学 Preparation method, multiporous biological matter carbon and the application of multiporous biological matter carbon
CN108033447B (en) * 2017-12-07 2021-06-15 吉林大学 Preparation method of porous biomass carbon, porous biomass carbon and application
CN108940202A (en) * 2018-08-02 2018-12-07 广东石油化工学院 Application of the banana stem active carbon in absorption Amoxicillin

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