CN101597104A - The method of multiple Microcystin in a kind of fenton photocatalytic oxidation degradation water - Google Patents
The method of multiple Microcystin in a kind of fenton photocatalytic oxidation degradation water Download PDFInfo
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- CN101597104A CN101597104A CNA2009103049095A CN200910304909A CN101597104A CN 101597104 A CN101597104 A CN 101597104A CN A2009103049095 A CNA2009103049095 A CN A2009103049095A CN 200910304909 A CN200910304909 A CN 200910304909A CN 101597104 A CN101597104 A CN 101597104A
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Abstract
The invention discloses a kind of method of fenton photocatalytic oxidation degradation of various microcystins in water, this method is to add Fenton reagent and photochemical catalyst in the water body that is contaminated by microcystin, pH value with sulfuric acid and sodium hydroxide solution adjusting mixed liquor is 2.2～6.2 then, after fully stirring, reactant liquor is placed under the uviol lamp react 0.5～5min again.The present invention can shorten the degradation process of Microcystin greatly when adding the low dosage catalytic oxidant, has the reaction times weak point, the characteristics that the reagent dosage is little, multiple Microcystin and non-secondary pollution in the efficient degradation water body can satisfy the Technology requirement of the small-sized purifier low cost in city tap-water factory and rural area, high-level efficiency degraded algae toxin at short notice.
Description
Technical field
The present invention relates to a kind of method of removing Microcystin in the water body, relate in particular to the method for multiple Microcystin in a kind of fenton photocatalytic oxidation degradation water.
Background technology
Microcystin is by what blue-green algae produced human body to be had the hepatotoxin of toxic action in the eutrophication water, it is ubiquitous in water body to be Microcystin-LR (MC-LR) and these two kinds of toxin of Microcystin-RR (MC-RR), and wherein MC-LR has the short function of tumor of intensive." drinking water sanitary standard " of the new issuing and implementation of China in 2006 (GB5749-2006) clearly stipulated the limit value of 1 μ g/L as MC-LR.Countries in the world adopt different methods carrying out a large amount of experimental studies aspect the removal of algae toxin respectively, but all there is defective in various degree in these methods.With regard to physical method, conventional water treatment process flocculation, precipitation, filtration, not good to the removal effect of algae toxin; General chemical oxidation method can increase solvability algae toxin concentration as chlorination etc., brings secondary pollution, and there are three danger that cause disinfection byproduct (DBP) simultaneously in the adding of chemical agent; Some special microbial strainss have degradation capability to the algae toxin, but degradation rate is generally less.
Research at present think remove the effective means of Microcystin be adopt high-level oxidation technology (Advanced oxidationprocesses, AOPs).High-level oxidation technology mainly is to utilize highly active free radical organism in the oxidative degradation polluted water under particular surroundings, realizes its permineralization, and the not restriction of polluted water body kind, composition, concentration, and non-secondary pollution.The high-level oxidation technology that application and research gets often on processing algae toxin at present comprises Fenton (Fenton) oxidation, ultraviolet light (UV) degraded, ultraviolet-hydrogen peroxide (UV-H
2O
2), ultraviolet-titanium dioxide (UV-TiO
2) photochemical catalytic oxidation etc.(list of references: Chen Xiaoguo, the Chopin is fixed, the .2003. such as Xu Xiaoqing sunshine/porous TiO for Chen Xiaoguo
2Film catalytic degradation Microcystin. Chinese water supply and drainage, 19 (7): 16-192003) etc. utilize sunshine/porous TiO
2Film system degraded algae toxin MC-RR, finding is not having TiO
2Under the catalytic condition, the MC-RR change in concentration is slow, has only reduced by 18% behind the illumination 840min, adds porous TiO
2Rear change in concentration is obviously accelerated, and the algae toxin of 2.5mg/L has reduced by 88.6% in the 840min; Yuan Baoling (list of references: Yuan Baoling, Chen Yiping, the effect research of the .2005.Fenton catalyzing oxidizing degrading algae phycotoxin MC-LRs such as Li Yanbo. ACTA Scientiae Circumstantiae, 25 (7): 925-929) Fenton reagent Removal of Microcystin-LR is studied, show the MC crude extract to the about 1.36mg/L of initial concentration, work as H
2O
2Dosage is 8g/L, H
2O
2Throwing amount and Fe
2+The ratio of throwing amount is 1/12, during pH value 2.0, behind the reaction time 30min, the clearance of Microcystin can reach more than 90%.Yuan Baoling (reference: Yuan Baoling, Chen Yiping, the collaborative research of removing the algae toxin of .2004. high ferro-photochemical catalytic oxidations such as Zheng Xueqin. environmental science, 25 (5): 106-108.2004) also adopt the collaborative algae toxin of removing of high ferro-photochemical catalytic oxidation, the result shows by adding the 10mg/L high ferro in the photochemical catalysis system, photocatalysis efficiency can be brought up to 100% from 63% behind the reaction 30min.Can find out that from above research high-level oxidation technology can effectively be removed the algae toxin, but the ubiquity reaction time is long, the shortcoming that the reagent dosage is big.This is because use separately UV-TiO
2, there is the shortcoming that the oxidant utilization rate is not high or the efficiency of light energy utilization is low in Fenton or UV-Fenton etc., this causes the time lengthening of oxidative degradation algae toxin, need accordingly to increase the oxidant dosage and reach preferably removal effect, and this must cause oxidized dose of removing of hydroxyl radical free radical of oxidation, reduces oxidation efficiency.
Summary of the invention
Technical problem to be solved by this invention is to provide the method for multiple Microcystin in a kind of fenton photocatalytic oxidation degradation water.This method adopts the catalyzed oxidation reagent of low dosage to remove multiple Microcystin in the water body, and multiple Microcystin of efficient degradation and non-secondary pollution at short notice.
For solving the problems of the technologies described above technical scheme of the present invention: the method for multiple Microcystin in a kind of fenton photocatalytic oxidation degradation water.This method is to add Fenton reagent and photochemical catalyst in the water body that is contaminated by microcystin, and the pH value with sulfuric acid and sodium hydroxide solution adjusting mixed liquor is 2.2～6.2 then, after fully stirring, reactant liquor is placed under the uviol lamp react 0.5～5min again.
In the method for above-mentioned fenton photocatalytic oxidation degradation of various microcystins in water, H in the Fenton reagent of described adding
2O
2The concentration that adds be preferably 0.05～1mmol/L, [H in the Fenton reagent
2O
2]/[FeSO
4] mol ratio be preferably 1/1,5/1,10/1,15/1,30/1 or 45/1.
In the method for aforesaid fenton photocatalytic oxidation degradation of various microcystins in water, H in the Fenton reagent of described adding
2O
2The concentration that adds be more preferably 0.1～0.5mmol/L, [H in the Fenton reagent
2O
2]/[FeSO
4] mol ratio be more preferably 1/1,5/1,10/1 or 15/1.
In the method for multiple Microcystin, the photocatalyst of described adding can be TiO in the aforesaid fenton photocatalytic oxidation degradation water
2, zinc oxide (ZnO), stannic oxide (SnO
2) etc., but consider being easy to get property, price and the security of reagent, the photocatalyst that the present invention selects for use is TiO
2, its add-on is preferably 0.005～0.1g/L.
In the aforesaid fenton photocatalytic oxidation degradation water in the method for multiple Microcystin, described photocatalyst TiO
2Add-on be more preferably 0.05～0.1g/L.
In the method for multiple Microcystin, described pH value with sulfuric acid and sodium hydroxide solution adjusting mixed solution is preferably 2.2～4.0 in the aforesaid fenton photocatalytic oxidation degradation water.
In the aforesaid fenton photocatalytic oxidation degradation water in the method for multiple Microcystin, described reaction solution is preferably and places that 1～20cm reacts at the place under the ultraviolet lamp.
In the aforesaid fenton photocatalytic oxidation degradation water in the method for multiple Microcystin, described reaction solution is more preferably and places that 1～5cm reacts at the place under the ultraviolet lamp.
In the method for multiple Microcystin, described reaction solution is preferably and places reaction 2～3min under the ultraviolet lamp in the aforesaid fenton photocatalytic oxidation degradation water.
Beneficial effect of the present invention: the present invention adopts UV-TiO
2The technology of-Fenton, the water body that will be polluted by multiple Microcystin and contain a kind of photocatalyst (TiO
2) Fenton reagent (Fenton reagent) in low pH value scope, under UV-light, reacting.Described water body by multiple algae endotoxin contamination comprises water body that is polluted by Microcystin-RR and the water body that is polluted by microcapsule algae toxin.Fenton reagent is a kind of by hydrogen peroxide (H
2O
2) and catalyst Fe
2+(FeSO
4) oxidation system that constitutes, its main oxidation mechanism is to utilize Fe under acidic conditions
2+As H
2O
2The catalyzer of oxygenolysis produces highly active hydroxyl radical free radical.It has very strong oxidizing potential, and hydroxyl radical free radical can further cause and transmit radical chain reaction, accelerates the oxidation of organic matter and reducing substances, thereby degrades most organic matter, even make partial organic substances reach mineralising.H in the Fenton reagent
2O
2Add concentration and be preferably 0.05～1mmol/L, and be more preferably 0.1～0.5mmol/L; [H in the Fenton reagent
2O
2]/[FeSO
4] (mol ratio) be preferably 1/1,5/1,10/1,15/1,30/1,45/1, and be more preferably 1/1,5/1,10/1,15/1.Fenton reagent has the highest oxidation effect under sour environment, this moment, free radical reaction was carried out the most abundant.So pH value to 2.2～6.2 with an amount of sulfuric acid and sodium hydroxide solution conditioned reaction liquid wherein are preferably pH value 2.2～4.0.Photocatalyst (TiO
2) in reaction solution, can produce the oxidation synergistic effect, not only can improve UV-light the photon utilization ratio but also can the increase system in the content of hydroxyl radical free radical, improve degradation effect to Microcystin.TiO
2Be the photocatalyst that is suitable for, reaction solution is preferably TiO
2Dosage is 0.005～0.1g/L, and is more preferably 0.05～0.1g/L.H
2O
2Toxic pollutant organic or inorganic in the water can be oxidized to compound nontoxic or easy decomposed by microbial as a kind of strong oxidant.But in general, inorganic matter is to H
2O
2Reaction fast than organic matter, and because of the restriction of mass transfer, the organic matter of denier is difficult to by H in the water
2O
2Oxidation.And the introducing of UV-light is carried out the direct sunshine degraded to Microcystis aeruginosa algae toxin on the one hand; Impel catalyzer TiO on the other hand
2Receive photon energy, make to be adsorbed on TiO
2The intermediate product that the Microcystin molecule of particle surface and decomposition thereof generate reacts, thereby has significantly improved degradation rate.In the reaction, the liquid level of reaction solution is preferably 1～20cm apart from the ultraviolet tube distance, and is more preferably 1～5cm.The DeR time is preferably carries out 0.5～5min under these conditions, and is more preferably 2～3min.
For verifying effect of the present invention, the applicant has carried out following contrast test:
Test one: adopt method (UV-TiO of the present invention
2-Fenton)
(1) test method: be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 15/1; Continue to add the photochemical catalyst TiO of 0.05g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0; After fully stirring, above-mentioned reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 3min under environment temperature is 16 ± 2 ℃.
(2) test-results: can remove 91.5% Microcystin-RR and 90.2% microcapsule algae toxin.
Test two: adopt method (UV-TiO of the present invention
2-Fenton)
(1) test method: be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 5/1; Continue to add the TiO of 0.05g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0; After fully stirring, above-mentioned reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 2.5min under environment temperature is 16 ± 2 ℃.
(2) test-results: can remove 94.0% Microcystin-RR and 93.1% microcapsule algae toxin.
Test three: use separately Fenton reagent
(1) test method: be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 15/1; The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0; Under being 16 ± 2 ℃, environment temperature reacts 2.5min after fully stirring.
(2) degradation rate of test-results: Microcystin-RR only is 23.8%, and the degradation rate of microcapsule algae toxin only is 21.0%.
Test four: use ultraviolet-hydrogen peroxide (UV-H
2O
2)
(1) test method: be that 0.35mg/L, microcapsule algae toxin concentration are the H that adds 0.1mmol/L in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2, the pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0, after fully stirring reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 2.5min under environment temperature is 16 ± 2 ℃.
(2) test-results: only can remove 70.3% Microcystin-RR and 67.2% microcapsule algae toxin.
Above result of the test shows that the present invention adopts UV-TiO
2Various microcystins in the-Fenton technology degradation water, not only to the clearance height of Microcystin-RR in the water and microcapsule algae toxin, can reach more than 90%, can be to the water generates secondary pollution during use, have quick, efficient, energy-conservation characteristics, and oxidant and efficiency of light energy utilization height, reaction time are short.The present invention can shorten the degradation process of Microcystin greatly when adding the low dosage catalytic oxidant, having the reaction time weak point (only needs 0.5～5min), the little (H of reagent dosage
2O
2The concentration that adds only be 0.1～0.5mmol/L, photochemical catalyst is TiO
2Addition only be 0.005～0.1g/L) characteristics, avoided independent use UV-TiO
2, UV-H
2O
2, the shortcoming that the oxidant utilization rate is not high or the efficiency of light energy utilization low and the reaction time is long that occurs of the methods such as Fenton or UV-Fenton.Use method of the present invention multiple Microcystin in the efficient degradation water body at short notice, and non-secondary pollution, can satisfy the Technology requirement of the small-sized purifier low cost in city tap-water factory and rural area, high-level efficiency degraded algae toxin.
The present invention is further illustrated below in conjunction with embodiment.
Embodiment
Embodiment 1.Be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 15/1; Continue to add the photochemical catalyst TiO of 0.05g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0; After fully stirring, above-mentioned reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 3min under environment temperature is 16 ± 2 ℃.
Embodiment 2.Be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 5/1; Continue to add the TiO of 0.05g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0; After fully stirring, above-mentioned reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 2.5min under environment temperature is 16 ± 2 ℃.
Embodiment 3.Be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.05mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 1/1, continue to add the photochemical catalyst TiO of 0.005g/L
2PH value with sulfuric acid and sodium hydroxide solution adjusting mixed liquor is 2.2 then; After fully stirring, above-mentioned reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 5min under environment temperature is 16 ± 2 ℃.
Embodiment 4.Be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 10/1, continue to add the TiO of 0.1g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 6.2; After fully stirring, above-mentioned reactant liquor is placed 20cm place under 18 watts of sterilization uviol lamps; Reaction 5min under environment temperature is 16 ± 2 ℃.
Embodiment 5.Be that 0.35mg/L, microcapsule algae toxin concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin-RR concentration
2O
2Concentration is 0.1mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 30/1; Continue to add the photochemical catalyst TiO of 0.05g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 2.2; After fully stirring, above-mentioned reactant liquor is placed 1cm place under 18 watts of sterilization uviol lamps; Reaction 2min under environment temperature is 16 ± 2 ℃.
Embodiment 6.Be that 0.35mg/L, microcysin LR concentration are to add Fenton reagent, H in the Fenton reagent of adding in the deionized water solution of 0.29mg/L in Microcystin RR concentration
2O
2Concentration is 0.5mmol/L, [H
2O
2]/[FeSO
4] mol ratio be 45/1; Continue to add the photochemical catalyst TiO of 0.1g/L
2The pH value of accurately regulating mixed liquor with sulfuric acid and sodium hydroxide solution then is 4.0; After fully stirring, above-mentioned reactant liquor is placed 5cm place under 18 watts of sterilization uviol lamps; Reaction 3min under environment temperature is 16 ± 2 ℃.
Embodiments of the present invention are not limited to the foregoing description, and the various variations of making under the prerequisite that does not break away from aim of the present invention all belong within protection scope of the present invention.
Claims (9)
1. the method for a fenton photocatalytic oxidation degradation of various microcystins in water, it is characterized in that: this method is to add Fenton reagent and photochemical catalyst in the water body that is contaminated by microcystin, pH value with sulfuric acid and sodium hydroxide solution adjusting mixed liquor is 2.2～6.2 then, after fully stirring, reactant liquor is placed under the uviol lamp react 0.5～5min again.
2. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 1, it is characterized in that: the concentration that adds of H2O2 is 0.05～1mmol/L in the Fenton reagent of described adding, and the mol ratio of [H2O2]/[FeSO4] is 1/1,5/1,10/1,15/1,30/1 or 45/1 in the Fenton reagent.
3. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 2, it is characterized in that: the concentration that adds of H2O2 is 0.1～0.5mmol/L in the Fenton reagent of described adding, and the mol ratio of [H2O2]/[FeSO4] is 1/1,5/1,10/1 or 15/1 in the Fenton reagent.
4. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 1, it is characterized in that: the photocatalyst of described adding is TiO2, its add-on is 0.005～0.1g/L.
5. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 4 is characterized in that: the add-on of described photocatalyst TiO2 is 0.05～0.1g/L.
6. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 1 is characterized in that: described pH value with sulfuric acid and sodium hydroxide solution adjusting mixed solution is 2.2～4.0.
7. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 1 is characterized in that: described reaction solution is to place that 1～20cm reacts at the place under the ultraviolet lamp.
8. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 7 is characterized in that: described reaction solution is to place that 1～5cm reacts at the place under the ultraviolet lamp.
9. the method for multiple Microcystin in the fenton photocatalytic oxidation degradation water according to claim 1 is characterized in that: described reaction solution is to place reaction 2～3min under the ultraviolet lamp.
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