CN109883885A - Evaluation method of the tea to uranium desorption effect - Google Patents
Evaluation method of the tea to uranium desorption effect Download PDFInfo
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Abstract
The evaluation method to uranium desorption effect is grown tea the invention discloses one.The method is first, in accordance with alkali-Acid-Base preparation method, gelatine liquid is added in the acidic phase of Lauxite synthesis, gelatine is made and is copolymerized Lauxite, it adds hydroxyapatite and Lauxite base biomimetic material is made, then Lauxite base biomimetic material and the oscillation of uranium liquid are adsorbed, the uranium-bearing Lauxite base biomimetic material for simulating uranium-bearing bone is made, then by changing tea soaking conditions, desorption effect of the evaluation tea to uranium in material.This method has determined green tea desorption effect better than oolong tea and black tea, and total desorption efficiency that green tea desorbs uranium five times is 85% or more, and strong tea desorption effect is better than weak tea, and tea desorption effect overnight is better than new brewed tea.This evaluation method can be used for distinguishing the desorption effect of variety classes tea, and uranium is reduced by the best method of drink of determination and is endangered the interior irradiation of human body.This method, which can be used as to be engaged in radiation worker and drink tea, arranges the reference of uranium.
Description
Technical field
The invention belongs to biomimetic material technology fields, and in particular to one grows tea the evaluation method to uranium desorption effect.
Background technique
Interior irradiation harm caused by the pollution of water body uranium is always people's issues that need special attention.Irradiation harm in generating
Main cause is the combination of uranium and bone.Uranium is in water mainly with UO2 2+Form exists, after people's accidentally drink uranium containing water, UO2 2+Through enteron aisle
It is absorbed into blood, is finally transferred in the organ-tissues such as liver, kidney, bone.Uranium has chemical toxicity and radioactivity, to liver, kidney master
Chemical toxicity is shown as, interior irradiation caused by radioactivity, which endangers, to be mainly shown as to bone.Compared with chemical toxicity, interior irradiation
Harm is more serious, because uranium can be attached to bone surface for a long time, generated interior irradiation can induce cell carcinogenesis.
Bone includes bone tissue, periosteum and marrow, and bone tissue is made of collagenous fibres and hydroxyapatite；Periosteum is in bone tissue
Outside is covered with nerve, tissue and blood vessel above；Marrow is inside bone tissue.Uranium is contacted by blood vessel with bone tissue with synosteosis
It realizes, the UO in blood vessel2 2+With HCO3 -Uranyl carbonate ion is generated, uranyl carbonate ion is handed over through vascular wall and bone tissue ion
It changes, uranium is largely enriched on bone.The methods of zoopery, mathematical model research uranium and synosteosis situation are mostly used at present, are moved
Object experimental result is more accurate, but the period is long, and uncontrollable factor is more, and (Ai Guoping waits rat to take in for a long time to subsequent processing trouble
Pathomorphology feature observation [J] liberation army medical journal after depleted uranium, 2007,32 (10): 1036-1039).Mathematical model
It does not need to test, but computationally intensive, formula and parameter is needed to support that (Li Shijun sucks the internal dose estimation of uranium compound
[J] radiation protection, 1985, (1): 24-33).Bone not can be used as in vitro study object because its structure is complicated and perishable.
It is endangered to reduce uranium to people's internal exposure, mostly uses drug decorporation, but the side effect of human body is still not clear in drug,
Therefore need to find more suitable uranium eccritic.Tea main component is tea polyphenols, at present existing polyphenol substance and metal ion
In conjunction with report (M Gurung, et al.Adsorptive removal of Cs (I) from aqueous solution
using polyphenols enriched biomass-based adsorbents[J].Chemical Engineering
Journal, 2013,231 (17): 113-120), therefore tea can be used as the strippant or eccritic of uranium.
Summary of the invention
The evaluation method to uranium desorption effect is grown tea the object of the present invention is to provide one.
The technical solution for realizing the aim of the invention is as follows:
Lauxite base biomimetic material and the oscillation of uranium liquid are adsorbed to the evaluation method of uranium desorption effect, uranium-bearing are made by tea
Lauxite base biomimetic material simultaneously is used to simulate uranium-bearing bone, by changing tea soaking conditions, in conjunction with tea to the solution of uranium in material
Effect is inhaled, determines best method of drink to reduce uranium to the interior irradiation of human body and endanger, the specific steps are as follows:
Step 1, according to alkali-Acid-Base preparation method, gelatine liquid is added in the acidic phase of Lauxite synthesis, is made
Gelatine be copolymerized Lauxite, by gelatine copolymerization Lauxite be dried to it is thick, be added hydroxyapatite simultaneously stir evenly, drying,
Broken, sieving, is made Lauxite base biomimetic material；
Step 2, under the conditions of 37 DEG C of constant temperature oscillations, Lauxite base biomimetic material is placed in uranium liquid and is adsorbed, adsorption time
For 0.5~12h, uranium-bearing Lauxite base biomimetic material is obtained, front and back uranium liquid concentration is reacted by measurement, according to formula QAbsorption=
(C0-Ce) × V/m calculates the uranium content Q of uranium-bearing Lauxite base biomimetic materialAbsorption, wherein QAbsorptionIt is bionical for uranium-bearing Lauxite base
The uranium content of material, mg/g；C0For uranium liquid initial concentration, mg/L；CeFor the uranium liquid concentration after the reaction t time, mg/L；V is uranium liquid
Volume, L；M is the quality of Lauxite base biomimetic material, g；
Step 3, under the conditions of 37 DEG C of constant temperature oscillations, uranium-bearing Lauxite base biomimetic material is placed in the tea that pH is 7.0~7.5
It is desorbed in water, desorption time is 1~48h, by the uranium concentration of tea after measurement reaction, according to formula QDesorption=C × V/m is calculated
Desorption quantity Q of the tea to uranium in uranium-bearing Lauxite base biomimetic materialDesorption, wherein QDesorptionFor the uranium desorption quantity of tea, mg/g；C is anti-
Answer the uranium concentration of tea after the t time, mg/L；V is tea volume, L；M is the quality of uranium-bearing Lauxite base biomimetic material, g.
Preferably, in step 1, the gelatine quality is the 10~50% of Lauxite quality.
Preferably, in step 1, the additional amount of the hydroxyapatite is according to collagenous fibres in bone tissue and hydroxy-apatite
The ratio-dependent of stone is the 60~90% of gelatine quality.
Preferably, in step 2, the mass ratio of the Lauxite base biomimetic material and uranium liquid is 0.1~10:100.
Preferably, in step 3, the immersion mass ratio of tealeaves and water is 1~4:100, soaking temperature 100 in the tea
DEG C, 1~48h of soaking time.
Preferably, in step 3, the mass ratio of the uranium-bearing Lauxite base biomimetic material and tea is 1~5:10.
The present invention compared with existing zoopery and mathematical model method, its advantage is that:
(1) in-vitro simulated tea can be achieved to the desorption process of uranium in bone, and experimental period is short, uncontrollable factor is less,
It is easy to operate, convenience of calculation.
(2) bone tissue ingredient can be combined together by the Lauxite base biomimetic material that the method for the present invention uses, bone tissue
Ingredient is mainly collagenous fibres and hydroxyapatite, and gelatine is identical as collagenous fibres ingredient, however gelatine is soluble easily in water, Wu Fazhi
It connects and is mixed with hydroxyapatite, amino that Lauxite contains, amide group can be combined with gelatine, while resin itself is glutinous
Property hydroxyapatite can be cohered in the material, the composition of Lauxite base biomimetic material is simple, have adsorption uranium similar with bone
Performance, can by adsorption process be made simulation uranium-bearing bone for experiment desorption study, Lauxite is materials synthesis matrix,
Its characteristic not soluble in water seemingly can be regarded as the soft tissue on bone tissue periphery with protein-based, will not be generated to experimental result dry
It disturbs.
(3) tea polyphenols in tea can be with UO2 2+In conjunction with, therefore tea has desorption effect, the desorption of variety classes tea to uranium
Effect is different, and related desorption result, which can be used as radiation worker, drinks tea and arrange the reference of uranium.
Detailed description of the invention
Fig. 1 is the uranium absorption amount of Lauxite base biomimetic material in embodiment 2 with the figure of changing in reaction time.
Fig. 2 is tea different in embodiment 3 to the desorption effect figure of uranium in uranium-bearing Lauxite base biomimetic material.
Fig. 3 is the influence diagram that pH value desorbs uranium in uranium-bearing Lauxite base biomimetic material to tea in embodiment 4.
Fig. 4 be in embodiment 5 green tea concentration and infusion of tea time to the influence diagram of uranium in desorbing materials.
Fig. 5 is total desorption efficiency of green tea in embodiment 6 with the figure of changing of cumulative desorption number.
Specific embodiment
Below with reference to specific embodiment and attached drawing, present invention is further described in detail.
Embodiment 1
The preparation method of Lauxite base biomimetic material, the specific steps are as follows:
Step 1, gelatine and water are mixed, heating stirring to 75 DEG C of obtained gelatine liquid in the ratio of 1:3, takes the gelatine quality to be
The 20% of Lauxite (liquid) quality.
Step 2, according to alkali-Acid-Base preparation method, gelatine liquid is added in the acidic phase of Lauxite synthesis, is made
Gelatine is copolymerized Lauxite.
Step 3, by gelatine copolymerization Lauxite be dried at 70 DEG C it is thick, be added hydroxyapatite simultaneously stir evenly,
It is dried at 70 DEG C, is crushed sieving, Lauxite base biomimetic material is made, wherein the additional amount of hydroxyapatite is according to bone tissue
The ratio-dependent of middle collagenous fibres and hydroxyapatite is the 70% of gelatine quality.
Embodiment 2
The preparation method of uranium-bearing Lauxite base biomimetic material, the specific steps are as follows:
Step 1,10g Lauxite base biomimetic material is placed in the uranium liquid (c (U)=10g/L) of 100mL, oscillation absorption
12h stands and filters.
Step 2, gained filter residue is washed with deionized, is dried at 70 DEG C, be crushed sieving, uranium-bearing Lauxite is made
Base biomimetic material.
Front and back uranium liquid concentration is reacted by measurement, in the uranium-bearing Lauxite base biomimetic material after reaction 12h is calculated
Uranium content be 73.41mg/g, the material will be used as subsequent desorption experiment material therefor, the uranium absorption amount of material is with the reaction time
Situation of change as shown in Figure 1, from fig. 1, it can be seen that absorption 12h after reach balance.
Embodiment 3
With different types of tea desorption uranium-bearing Lauxite base biomimetic material in uranium, desorption in constant temperature oscillation case into
Row.The immersion mass ratio of tealeaves selection black tea (Jin Junmei), oolong tea (Iron Guanyin) and green tea (Pilochun (a green tea)), tealeaves and water is 1:
50,100 DEG C of soaking temperature, impregnate 1h.Measuring black tea pH using pH meter is 5.0, and oolong tea pH is 5.4, and green tea pH is 6.0, is examined
The pH value for considering tissue liquid is generally 7.0~7.5, is 7.0 with hydrochloric acid and sodium hydroxide tune tea pH.By 10g uranium-bearing urea
Urea formaldehyde base biomimetic material is placed in the different types of tea of 100mL and desorbs, and 37 DEG C of desorption temperature, 0.5~48h of desorption time,
The uranium desorption quantity of tea is measured, as a result as shown in Figure 2.It desorbs as can be seen from Figure 2 and reaches balance afterwards for 24 hours, the uranium desorption quantity of black tea is
21.41mg/g, the uranium desorption quantity of oolong tea are 23.94mg/g, and the uranium desorption quantity of green tea is 26.45mg/g, the uranium desorption quantity of water
For 6.46mg/g, therefore the desorption effect of tea is better than water, three grow tea middle green tea desorption effect it is best, this is because green tea
Polyphenol content is most, can be with more UO2 2+In conjunction with promotion desorption carries out.
Embodiment 4
With the uranium in the tea of different pH value desorption uranium-bearing Lauxite base biomimetic material, desorption in constant temperature oscillation case into
Row.The immersion mass ratio of tealeaves selection black tea (Jin Junmei), oolong tea (Iron Guanyin) and green tea (Pilochun (a green tea)), tealeaves and water is 1:
50,100 DEG C of soaking temperature, impregnate 1h.Because the tissue fluid pH value of human body different parts has different, substantially variation range
It is 6.0~9.0, so being 6.0~8.0 with hydrochloric acid and sodium hydroxide tune tea pH value.By the bionical material of 10g uranium-bearing Lauxite base
To expect to desorb in the tea for the different pH value for being placed in 100mL, 37 DEG C of desorption temperature, desorption time for 24 hours, measures the uranium desorption quantity of tea,
As a result as shown in Figure 3.As can be seen from Figure 3, tea increases the desorption quantity of uranium with the increase of pH value, this is because meta-alkalescence
Under the conditions of, OH-It is easier to and UO2 2+In conjunction with, promote desorption progress.Green tea at various ph values is best to the desorption effect of uranium.
Embodiment 5
With the uranium in the various concentration green tea desorption uranium-bearing Lauxite base biomimetic material of different soaking times, desorb in perseverance
It is carried out in temperature oscillation case.Take the immersion mass ratio of tealeaves and water be 1~4:100,100 DEG C of soaking temperature, soaking time be 1~
48h is 7.0 with hydrochloric acid and sodium hydroxide tune green tea pH.10g uranium-bearing Lauxite base biomimetic material is placed in the green tea of 100mL
Middle desorption, 37 DEG C of desorption temperature, desorption time for 24 hours, measures the uranium desorption quantity of tea, as a result as shown in Figure 4.As can be seen from Figure 4, strong tea
Desorption effect be substantially better than weak tea, the desorption effect of tea (soaking time is longer) overnight is better than new brewed tea.When taking tealeaves
Immersion mass ratio with water is 1:25, and when soaking time is 48h, the uranium desorption quantity of green tea is up to 32.61mg/g.
Embodiment 6
The uranium in uranium-bearing Lauxite base biomimetic material is repeatedly desorbed with green tea, desorption carries out in constant temperature oscillation case.It is logical
Desorption number is crossed to simulate the desorption process that human body is repeatedly drunk tea to uranium.The immersion mass ratio of tealeaves and water is 1:25, impregnates temperature
100 DEG C of degree impregnates 1h, is 7.0 with hydrochloric acid and sodium hydroxide tune green tea pH value.10g uranium-bearing Lauxite base biomimetic material is set
It is desorbed in the green tea of 100mL, continuous desorption 5 times, 37 DEG C of desorption temperature, desorption time for 24 hours, measures the uranium desorption quantity of tea, knot
For fruit as shown in figure 5, total desorption efficiency in Fig. 5 is the percentage that uranium desorption total amount accounts for uranium content, it is n-th tea solution that uranium, which desorbs total amount,
Inhale corresponding n times uranium desorption quantity accumulated value (n >=1).As can be seen from Figure 5, total desorption efficiencies of green tea 5 times desorptions are up to 85% or more,
Illustrating repeatedly to drink tea has row's uranium effect well.
Claims (6)
1. tea is to the evaluation method of uranium desorption effect, which is characterized in that specific step is as follows:
Step 1, according to alkali-Acid-Base preparation method, gelatine liquid is added in the acidic phase of Lauxite synthesis, gelatine is made
Be copolymerized Lauxite, by gelatine copolymerization Lauxite be dried to it is thick, be added hydroxyapatite simultaneously stir evenly, dry, be crushed,
Lauxite base biomimetic material is made in sieving；
Step 2, under the conditions of 37 DEG C of constant temperature oscillations, Lauxite base biomimetic material is placed in uranium liquid and is adsorbed, adsorption time 0.5
~12h obtains uranium-bearing Lauxite base biomimetic material, front and back uranium liquid concentration is reacted by measurement, according to formula QAbsorption=(C0-Ce)
× V/m calculates the uranium content Q of uranium-bearing Lauxite base biomimetic materialAbsorption, wherein QAbsorptionFor uranium-bearing Lauxite base biomimetic material
Uranium content, mg/g；C0For uranium liquid initial concentration, mg/L；CeFor the uranium liquid concentration after the reaction t time, mg/L；V is uranium liquid product,
L；M is the quality of Lauxite base biomimetic material, g；
Step 3, under the conditions of 37 DEG C of constant temperature oscillations, uranium-bearing Lauxite base biomimetic material is placed in the tea that pH is 7.0~7.5
Desorption, desorption time are 1~48h, by the uranium concentration of tea after measurement reaction, according to formula QDesorption=C × V/m calculates tea pair
The desorption quantity Q of uranium in uranium-bearing Lauxite base biomimetic materialDesorption, wherein QDesorptionFor the uranium desorption quantity of tea, mg/g；When C is reaction t
Between after tea uranium concentration, mg/L；V is tea volume, L；M is the quality of uranium-bearing Lauxite base biomimetic material, g.
2. evaluation method according to claim 1, which is characterized in that in step 1, the gelatine quality is Lauxite
The 10~50% of quality.
3. evaluation method according to claim 1, which is characterized in that in step 1, the additional amount of the hydroxyapatite
It is the 60~90% of gelatine quality according to the ratio-dependent of collagenous fibres in bone tissue and hydroxyapatite.
4. evaluation method according to claim 1, which is characterized in that in step 2, the Lauxite base biomimetic material
Mass ratio with uranium liquid is 0.1~10:100.
5. evaluation method according to claim 1, which is characterized in that in step 3, the leaching of tealeaves and water in the tea
Bubble mass ratio be 1~4:100,100 DEG C of soaking temperature, 1~48h of soaking time.
6. evaluation method according to claim 1, which is characterized in that in step 3, the uranium-bearing Lauxite base is bionical
The mass ratio of material and tea is 1~5:10.
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