CN102921380B - Modification method for improving absorption performance of biomass carbon - Google Patents
Modification method for improving absorption performance of biomass carbon Download PDFInfo
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- CN102921380B CN102921380B CN201210463120.6A CN201210463120A CN102921380B CN 102921380 B CN102921380 B CN 102921380B CN 201210463120 A CN201210463120 A CN 201210463120A CN 102921380 B CN102921380 B CN 102921380B
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Abstract
The invention discloses a modification method for improving absorption performance of biomass carbon. The modification method comprises steps as follows: carrying out pyrolysis on biomass raw materials such as pine, straw and shell to obtain the biomass carbon under nitrogen atmosphere in absence of oxygen; and directly transferring the biomass carbon in an ultraviolet light source for radiating for a period of time so as to obtain the modified biomass carbon. The step of radiating the biomass carbon by the ultraviolet light source is specifically characterized by uniformly spreading the biomass carbon on the surface of a high-temperature resistant (ceramic) container; then moving the biomass carbon to be at position of 78-82 mm away from a high-pressure mercury lamp tube with the power of 1000W, the spectrum range of 365 to 450nm and the peak value of 365nm, and radiating for 16 hours; and then taking out and transferring into a dryer for cooling so as to achieve the modification of the biomass carbon. By adopting the modification method, the absorption performance of the biomass carbon can be quickly enhanced; and the modification method has the advantages of being simple and convenient to operate, and beneficial for implementation.
Description
Technical field
The present invention relates to a kind of technical field that can utilize biomass carbon absorption property to carry out water pollution control, relate in particular to a kind of method of modifying that improves biomass carbon absorption property.
Background technology
Biomass carbon mainly refers to the granular materials that living beings obtain under anoxia condition after high temperature carbonization.Biomass carbon has highly developed pore structure, and rich surface is containing multiple functional group, and effectively Adsorption of Heavy Metals and organic pollution, has great application potential at aspects such as soil improvement, contaminated environment reparations.
In order further to improve the adsorption effect of biomass carbon to pollutant, in prior art, existed and adopted various method of modifying to improve the technology in the adsorption activity site on biomass carbon surface, wherein acid-base solution cleaning, Fenton oxidation, inorganic salt modification, appendix ion etc. are main chemical modification means.But in chemical modification process, having used a large amount of chemical agents very easily to cause secondary pollution, the method for modifying that research and probe is new for this reason becomes and has problem to be solved effectively to improve the adsorption capacity of biomass carbon.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention is: provide a kind of easy and simple to handle, be beneficial to enforcement, and the method for modifying that can improve biomass carbon absorption property of non-secondary pollution.
In order to solve the problems of the technologies described above, in the present invention, adopt following technical scheme:
Improve a method of modifying for biomass carbon absorption property, its feature is, biomass carbon is placed under ultraviolet light source and is realized biomass carbon modification after radiation a period of time.
Wherein, it is pyrogenically prepared that described biomass carbon can preferably adopt biomass material 700 DEG C of anoxics under nitrogen atmosphere such as pine, stalk or shell.
As optimization, ultraviolet light source can adopt power 1000W, spectral region 365-450nm, the high-pressure sodium lamp fluorescent tube of peak value 365nm.
As optimization, biomass carbon is evenly laid in to resistant to elevated temperatures (pottery) vessel surface, then is placed in 80 ± 2mm place radiation under high-pressure sodium lamp fluorescent tube.
As optimization, it is 8 ~ 16h that biomass carbon is placed in to ultraviolet light source below radiated time, takes out that to put into drier cooling after radiation.
In this method, by ultraviolet (UV) method of radiating, charcoal is carried out to modification, can improve its absorption property,
principle is as follows.
Charcoal be biological residual body under anoxic or hypoxia condition, the material stable, height aromatization producing through high temperature pyrolysis, is mainly made up of elements such as carbon, hydrogen, oxygen, wherein phosphorus content is up to more than 80%; Microstructure, charcoal is many to be made up of aromatic rings lamella tightly packed, high distortion, and pore structure prosperity, has larger specific area, rich surface, containing functional groups such as carboxyl, phenolic hydroxyl group, carbonyl, lactone group, acid anhydrides, has good absorption property.
Much research finds that charcoal Adsorption of Heavy Metals mainly comes from the functional group of charcoal, surface electrostatic gravitation, surface precipitation etc., and wherein hydroxyl, carboxyl and phosphate group are more outstanding for the contribution of charcoal Adsorption of Heavy Metals.
Applicant studies and finds that ultraviolet (UV) radiation can obviously improve charcoal surface acidity functional group content, effectively dredges impurity in charcoal duct, changes its pore structure composition, thereby improves the adsorption capacity of charcoal.In aftermentioned part detailed description of the invention, prepare charcoal radiation modification as example taking discarded pine material under 700 DEG C of nitrogen atmospheres, show with porosity measurement technical Analysis by elementary analysis, sem observation, Fourier's infrared spectrum analysis, specific area: compared with unmodified charcoal, C, H, the N content of radiation modification (UV) charcoal all reduce, the content of O content and acid oxygen-containing functional group increases, armaticity, the polarity of charcoal increase, and reproducibility weakens; Radiation simultaneously can be removed the impurity in charcoal duct, loose duct, and these are all conducive to the raising of charcoal adsorbance.
Therefore this method can improve biomass carbon absorption property effectively, and have easy and simple to handle, be beneficial to the advantages such as enforcement.
Brief description of the drawings
Fig. 1 is in detailed description of the invention, carries out the experiment effect schematic diagram of iodine adsorption experiment.
Fig. 2 is in detailed description of the invention, carries out the experiment effect schematic diagram of heavy metal adsorption experiment.
Fig. 3 is in detailed description of the invention, to the biomass carbon electron microscope observation figure before modification radiation.
Fig. 4 is in detailed description of the invention, to the biomass carbon electron microscope observation figure after modification radiation.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, structure of the present invention is described in further detail.
Improve a method of modifying for biomass carbon absorption property, biomass carbon is placed under ultraviolet light source and is realized biomass carbon modification after radiation a period of time.When concrete enforcement, the biomass carbon got adopt pine raw material 700 DEG C of anoxics under nitrogen atmosphere pyrogenically prepared after, grind to sieve again and get particle diameter 40-80 object sample, after distilled water cleans up, put into 105 DEG C of baking ovens and dry, and then carry out radiation under ultraviolet light source.The concrete steps of ultra-violet radiation are: biomass carbon is evenly laid in to resistant to elevated temperatures ceramic vessel surface, be placed in again power 1000W, spectral region 365-450nm, radiation 16h in 80 ± 2mm place under the high-pressure sodium lamp fluorescent tube of peak value 365nm, after taking-up, put into drier cooling, make modified biomass charcoal.
In said method, applicant is analyzed and detects biomass carbon and the biomass carbon after ultra-violet radiation modification.When analysis, applicant has adopted sem observation, Fourier's infrared spectrum analysis, then carry out the modes such as specific area and porosity measurement.Following table is elementary analysis data list.
Elementary analysis data:
| Sample | C（%） | N（%） | H（%） | O（%） | H/C | (O+N)/C | (C+H)/O |
| Before radiation | 88.0712 | 1.4384 | 0.3591 | 9.9000 | 0.0041 | 0.1287 | 8.9323 |
| After radiation | 84.7834 | 1.4232 | 0.3113 | 13.4773 | 0.0037 | 0.1762 | 6.2979 |
As shown above, C, H, the N content of radiation artifact matter charcoal all reduce, and O content increases, and the ratio of H/C, (C+H)/O decreases.H/C reduces to show that armaticity increases, and (C+H)/O reduction shows that biomass carbon reproducibility weakens; (O+N)/C ratio shows that in increase polarity is increasing.So can judge that modification artifact matter charcoal absorption property improves greatly.
Meanwhile, the SEM figure (seeing Fig. 3 and Fig. 4) that contrast radiation front and back amplification is 2000 times analyzes and shows: radiation can be removed the impurity in biomass carbon duct, and loose duct, is conducive to the carrying out of adsorbing.
In order further to verify that the adsorption effect after modification, applicant adopt the biomass carbon after different radiated time modifications to carry out following actual adsorptivity experiment.
1, iodine sorption value experiment
Operation is with reference to the mensuration of GB/T 12496.8-1999 wood activated charcoal test method iodine sorption value, the active carbon adopting is, taking above-mentioned method of modifying as active carbon basic but that adopt respectively different radiated times to make, carry out iodine sorption value experiment, modified biomass charcoal grain diameter all adopts 40-80 order, duration of oscillation is 1h, carries out trend analysis.
Experimental result as shown in Figure 1, has shown that radiated time is 0 hour, and the biomass carbon that does not pass through modification is the poorest to iodine adsorption effect.And radiated time exceed 8 hours after iodine adsorption effect obviously improve, the radiation biomass carbon of 16 hours is the highest to iodine adsorption effect, after 16 hours, the growth of radiated time is little on adsorption effect impact.
This experiment showed, that the biomass carbon adsorption capacity after modification of the present invention increases, and the radiated time effect of 16 hours is best.
2, heavy metal adsorption experiment
The clearance experiment of a, heavy metal Pb.
Experimental technique is the Pb (NO that adopts concentration 35mg/L
3)
2solution, gets 25ml solution in 50ml centrifuge tube, drops into biomass carbon, biomass carbon dosage 6g/L, each sample arranges three groups of Duplicate Samples, regulates pH=5.0, is placed in SHA-C type constant temperature oscillator and vibrates, duration of oscillation T=24h, 25 DEG C of vibration temperature, speed 200r/min.After vibration, detect its clearance to heavy metal Pb.When experiment, according to above-mentioned experimental technique, adopt respectively according to the inventive method preparation but do not carry out contrast experiment through the biomass carbon of ultraviolet radiation and the modified biomass charcoal of preparing in strict accordance with this method.
The clearance experiment of b, heavy metal Cd.
Experimental technique is the Cd (NO that adopts concentration 6mg/L
3)
2solution, gets 25ml solution in 50ml centrifuge tube, drops into biomass carbon, biomass carbon dosage 6g/L, each sample arranges three groups of Duplicate Samples, regulates pH=5.0, is placed in SHA-C type constant temperature oscillator and vibrates, duration of oscillation T=24h, 25 DEG C of vibration temperature, speed 200r/min.After vibration, detect its clearance to heavy metal Cd.When experiment, according to above-mentioned experimental technique, adopt respectively according to the inventive method preparation but do not carry out contrast experiment through the biomass carbon of ultraviolet radiation and the modified biomass charcoal of preparing in strict accordance with this method.
Experimental result as shown in Figure 2, has shown the modified biomass charcoal that this method obtains, and it is the biomass carbon far above non-modified to the adsorption effect of heavy metal.
Claims (2)
1. a method of modifying that improves biomass carbon absorption property, is characterized in that, biomass carbon is placed in and under ultraviolet light source, after radiation a period of time, obtains modified biomass charcoal; Ultraviolet light source adopts power 1000W, spectral region 365-450nm, the high-pressure sodium lamp fluorescent tube of peak value 365nm; Biomass carbon is evenly laid in to resistant to elevated temperatures vessel surface, then is placed in 80 ± 2mm place radiation under high-pressure sodium lamp fluorescent tube; It is 8 ~ 16h that biomass carbon is placed in to ultraviolet light source below radiated time, takes out that to put into drier cooling after radiation.
2. the method for modifying of raising biomass carbon absorption property as claimed in claim 1, is characterized in that, described biomass carbon adopts the anaerobic pyrolysis preparation under nitrogen atmosphere of pine, stalk or shell.
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| CN106582514A (en) * | 2015-10-14 | 2017-04-26 | 天津众华鑫环保科技有限公司 | Method for recycling biological waste in biomass charcoal |
| CN106582891A (en) * | 2016-12-07 | 2017-04-26 | 新疆兵团现代绿色氯碱化工工程研究中心(有限公司) | Method for modifying catalyst carrier by ultraviolet radiation |
| CN108002524B (en) * | 2017-11-23 | 2020-11-10 | 浙江海洋大学 | Modified aeration biological filter composite filler and preparation method thereof |
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| CN109126730B (en) * | 2018-09-10 | 2021-05-18 | 江苏省农业科学院 | Biomass porous adsorption material and preparation method and application thereof |
| CN110028360A (en) * | 2019-06-11 | 2019-07-19 | 浙江省农业科学院 | Broccoli organic fertilizer |
| CN110496606A (en) * | 2019-08-30 | 2019-11-26 | 南昌航空大学 | A kind of synthesis preparation method of novel removal of mercury material |
| CN110773128A (en) * | 2019-11-29 | 2020-02-11 | 中国电建集团成都勘测设计研究院有限公司 | Photo-thermal synergistic modification method of biomass charcoal |
| CN115676958A (en) * | 2022-11-10 | 2023-02-03 | 华北水利水电大学 | Method for reducing Cu (II) and tetracycline pollution |
| CN117263326A (en) * | 2023-09-20 | 2023-12-22 | 东北农业大学 | Preparation method of phosphorus selective adsorption electrode for low-concentration phosphorus wastewater |
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