CN109928481A - A kind of Fe0The method of/PDS system processing waste water from dyestuff - Google Patents

A kind of Fe0The method of/PDS system processing waste water from dyestuff Download PDF

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Publication number
CN109928481A
CN109928481A CN201910322441.6A CN201910322441A CN109928481A CN 109928481 A CN109928481 A CN 109928481A CN 201910322441 A CN201910322441 A CN 201910322441A CN 109928481 A CN109928481 A CN 109928481A
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China
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rhodamine
pds
dyestuff
solution
waste water
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CN201910322441.6A
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魏永
高赟
任冰
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Changzhou University
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Changzhou University
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Abstract

A kind of Fe of the present invention0The method of/PDS system processing waste water from dyestuff.To overcome Fe2+Activating persulfate (PDS), existing defect, the present invention use Fe in the process0As Fe2+Source, to realize the reaction to persulfate indirectly.No matter under the conditions of aerobic/anaerobic, Fe can be realized0To Fe2+Conversion.Be conducive to improve the degradation rate to pollutant.Fe0Activation system can not only improve the degradation to pollutant, and Fe0The heterogeneous system of building not will cause a large amount of iron ion and be dissolved in water body and causes secondary pollution;Fe0It can be filtered, recycling and reusing, the cost of wastewater treatment can be reduced.

Description

A kind of Fe0The method of/PDS system processing waste water from dyestuff
Technical field
The invention belongs to ecological environmental protection fields, and in particular to a kind of dye waste water treatment method.
Background technique
As DYE PRODUCTION big country, waste water from dyestuff pollution situation is severe in China.Dye Wastewater Decolorization is big, toxicity is high, complicated component, The features such as biodegradability is poor, and water quality and quantity changes greatly, and processing difficulty is big, if unprocessed direct emission up to standard, can not only destroy The ecological environment of water body, and can be detrimental to health, limit the development of industrial or agricultural.The outstanding problem that waste water from dyestuff is administered is main It is the removal of waste water decoloring and persistent organic pollutants.According to the principle of dye wastewater treatment technology, existing dyestuff Wastewater treatment method is roughly divided into physical method, chemical method, bioanalysis and some group technologies etc..Traditional high-level oxidation technology is Using OH as main active substances.In recent years, persulfate high-level oxidation technology becomes research hot topic.Persulfate advanced oxidation Technology is with potentiometric titrations (SO4 -) it is main active substances, SO4 -Oxidation-reduction potential is 2.5-3.1 V, remote high In the oxidation-reduction potential current potential (1.8-2.7 V) of OH.Persulfate under normal temperature and pressure is relatively stable, SO4 -It is main logical Crossing specific activation method makes the oxygen-oxygen bond (- O-O-) in persulfate be broken generation.
Summary of the invention
Existing activation method can effective activation persulfate generation SO4 -Degradable organic pollutant, however in reality It is limited in engineer application by factors.Such as thermal activation, photoactivation, microwave activation need additional thermal energy, luminous energy energy Amount supply, severe reaction conditions, operating cost are higher.Transition metal ions Fe2+Activate PDS(potassium peroxydisulfate) reaction system because For the advantages that reaction condition is mild, low energy consumption, cheap, become the most common activation method.However Fe2+Activate PDS's System also suffers from certain drawbacks itself.Fe2+As metal ion, it can be dissolved in water body in activation process, cause secondary pollution. And persulfate and Fe2+Reaction speed is exceedingly fast, the SO that moment generates4 -Quantity is more, Fe2+Meeting and SO4 -Reaction hinders The haptoreaction of itself and pollutant is unfavorable for the removal of organic pollutant.To overcome Fe2+Defect present in activation process, this Invention uses Fe0As Fe2+Source, to realize the reaction to persulfate indirectly.No matter under the conditions of aerobic/anaerobic, all Fe may be implemented0To Fe2+Conversion.Be conducive to improve the degradation rate to pollutant.Fe0Activation system can not only be improved to pollution The degradation of object, and Fe0The heterogeneous system of building not will cause a large amount of iron ion and be dissolved in water body and causes secondary pollution;Fe0 It can be filtered, recycling and reusing, the cost of wastewater treatment can be reduced.Fe0/ PDS system handles waste water from dyestuff method tool Body the following steps are included:
(1) it takes 60 mg rhodamine B reagents to be dissolved in beaker, is then transferred to 500 mL reaction, hinders its contact with pollutant Reaction, is unfavorable for the removal of organic pollutant.To overcome Fe2+Defect present in activation process, the present invention use Fe0As Fe2+Source, to realize the reaction to persulfate indirectly.No matter under the conditions of aerobic/anaerobic, Fe can be realized0To Fe2+ Conversion.Be conducive to improve the degradation rate to pollutant.Fe0Activation system can not only improve the degradation to pollutant, and Fe0 The heterogeneous system of building not will cause a large amount of iron ion and be dissolved in water body and causes secondary pollution;Fe0It can be filtered, return It receives and recycles, the cost of wastewater treatment can be reduced.Fe0/ PDS system handle waste water from dyestuff method specifically includes the following steps:
(1) it takes 60 mg rhodamine B reagents to be dissolved in beaker, is then transferred to 500 mL
(3) 2 mL of rhodamine B water sample is taken in 0,5,10,30,45,60,90 min respectively, and water sample is quenched in the methanol that 1 mL is added In living radical terminate reaction, avoid free radical continue rhodamine B degradation, influence the measurement of water sample result.Through 0.45 μm Pin hole membrane filtration after measure concentration.It is measured at 558 nm of maximum absorption wavelength using spectrophotometer, determines water sample Absorbance calculates corresponding dye strength using standard curve.
Detailed description of the invention
Fig. 1 is the comparison of different system removal rhodamine Bs;
Influence of the initial pH of Fig. 2 to rhodamine B degradation rate;
Fig. 3 Fe0Influence of the dosage to rhodamine B degradation rate;
Influence of Fig. 4 PDS dosage to rhodamine B degradation rate;
Influence of Fig. 5 reaction temperature to rhodamine B degradation rate;
Fig. 6 Fe0Recycling comparison.
Specific embodiment
Under elaborate to the embodiment of the present invention: the present embodiment carries out reality under the premise of the technical scheme of the present invention It applies, gives detailed embodiment, but protection scope of the present invention is not limited to following embodiments.
Embodiment one
Experiment condition: initial pH is 7, Fe0Dosage is 0.5 g/L, and PDS dosage is 2 g/L, reaction temperature 25 ℃.As shown in Figure 1, when individually adding Zero-valent Iron, rhodamine B degradation rate only has 6.9 %, there is no removal, this says Bright Zero-valent Iron is poor to rhodamine B adsorption effect, cannot effective rhodamine B degradation.
When individually adding PDS, rhodamine B degradation rate is 25.6 %.PDS itself has certain oxidability, when PDS is molten In aqueous solution, it may occur that hydrolysis generates over cure acid group (S2O8 2-), oxidation-reduction potential is 2.01 V, can effective oxygen Change some of the contaminants, but it is relatively weak to be limited to its oxidability.Therefore, the rhodamine B degradation rate in reaction system is not high.
Fe0Rhodamine B degradation rate in/PDS system is 96.2 %, with individual Fe0, individual PDS compare, respectively on 89.7 %, 71.0 % are risen.This is because also oxidizing strong active material is raw other than the oxidability of PDS itself At.Illustrate Fe0It can effective activation persulfate generation SO4 -, thus oxidative degradation rhodamine B.
Embodiment two
Experiment condition: Fe0Dosage is 0.5 g/L, and PDS dosage is 2 g/L, and reaction temperature is 25 DEG C, and initial pH is respectively 3、7、9。
As shown in Figure 2, the lower Fe of acid, neutral and alkalinity0/ PDS system has higher degradation to rhdamine B waste water Rate, but its degradation rate is slightly different.After reacting 30 min, the degradation rate under acid condition reaches 45.4 %, and neutral item Under part, removal rate is 40.5 %;Degradation rate under alkaline condition is 38.4 %.
Embodiment three
Experiment condition: PDS dosage is 2 g/L, and initial pH is 7, and reaction temperature is 25 DEG C, Fe0Dosage is respectively 0.25, 0.5,1.0 g/L.From the figure 3, it may be seen that working as Fe0When dosage increases to 0.5 g/L from 0.25 g/L, rhodamine B degradation rate also with Increase to 96.6 % from 85.1 %, but work as Fe0When dosage increases to 1 g/L again, removal rate is but without occurring significantly It increases.
Example IV
Experiment condition: initial pH is 7, and reaction temperature is 25 DEG C, Fe0Dosage is 0.5 g/L, PDS dosage is respectively 1,2, 3 g/L.As shown in Figure 4, PDS dosage has large effect to rhodamine B degradation rate.Contaminant degradation rate is with PDS dosage Increase first increases and then decreases.When dosage increases to 2 g/L from 1g/L, rhodamine B degradation rate is increased to from 79.4 % 96.6 %;When dosage further increases 3g/L, but there is a degree of decline in degradation rate, and degradation rate is down to 92.1%.
Embodiment five
Experiment condition: initial pH is 7, Fe0Dosage is 0.5 g/L, and PDS dosage is 2g/L.Reaction temperature is respectively 25 ℃,40 ℃,60 ℃.As shown in Figure 5, with the raising of reaction temperature, rhodamine B degradation rate is constantly increased.Work as reaction temperature When being 60 DEG C, removal rate reaches 99.9 %.
Embodiment six
Fe0Reusability experiment.After 4 h of each reaction, first with magnet or the mode of filtering by Fe0It is recycled, then With distilled water repeated flushing, rinses to aqueous solution and neutrality is presented, finally dry.Fe after drying0Continue on for testing, measurement is not With the dye strength of period.Recycling, experiment are repeated by 3-4 times, each dyestuff degradation rate is compared, to judge Fe0's Reusability.As seen from Figure 6, with Fe0Access times are continuously increased, and degradation efficiency slightly decreases.This is main It is because of Fe0The Fe of generation2+After reacting with PDS, Fe can be converted into3+, Fe3+Oxidation film can be attached to Fe0The surface of solids is reduced Fe2+Production quantity, make SO indirectly4 -Generation quantity reduce.But as seen from the figure, the fall of removal rate is lower, most Big fall is 10.2%.In conclusion Fe0During activating persulfate rhodamine B degradation dye wastewater, Fe0Reusability it is relatively good, can repeatedly be recycled use.

Claims (2)

1. a kind of Fe0The method of/PDS system processing waste water from dyestuff, which is characterized in that the processing method includes the following steps:
(1) it takes 60 mg rhodamine B reagents to be dissolved in beaker, is then transferred to 500 mL volumetric flasks, repeatedly rinses beaker with distilled water And aqueous solution is transferred in volumetric flask, the solution in volumetric flask is finally diluted to graduation mark, prepares rhodamine B stock solution;
(2) 50 mL rhodamine B stock solution of liquid is measured in 200 mL volumetric flasks, is diluted to graduation mark, sieve of 30 mg/L is made Red bright B solution, and be transferred in beaker, recycle H2SO4The pH value that solution is adjusted with NaOH is respectively 3 ~ 9, is then transferred to solution In conical flask, it is put into constant temperature oscillation box, and the Fe of 0.25 ~ 1.0g/L is added0, the potassium peroxydisulfate (PDS) of 1 ~ 3g/L, reaction temperature It is 25 ~ 60 DEG C;
(3) 2 mL of rhodamine B water sample is taken in 0,5,10,30,45,60,90 min respectively, and water sample is quenched in the methanol that 1 mL is added In living radical terminate reaction, avoid free radical continue rhodamine B degradation, the measurement of water sample result is influenced, through 0.45 μm Pin hole membrane filtration after measure concentration.
2. a kind of Fe according to claim 10The method of/PDS system processing waste water from dyestuff, it is characterised in that: the step (1), (2), rhodamine B is only used as the representative object of waste water from dyestuff in (3), using spectrophotometer in 558 nm of maximum absorption wavelength Place's measurement, determines the absorbance of water sample, calculates corresponding dye strength using standard curve.
CN201910322441.6A 2019-04-22 2019-04-22 A kind of Fe0The method of/PDS system processing waste water from dyestuff Pending CN109928481A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104129841A (en) * 2014-08-22 2014-11-05 中国科学院南京土壤研究所 Method for degrading organic pollutants in water body through activator composite material and activating persulfate
CN108423792A (en) * 2018-03-29 2018-08-21 安徽建筑大学 A method of being catalyzed persulfate rhodamine B degradation using chitosan coating Nanoscale Iron

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104129841A (en) * 2014-08-22 2014-11-05 中国科学院南京土壤研究所 Method for degrading organic pollutants in water body through activator composite material and activating persulfate
CN108423792A (en) * 2018-03-29 2018-08-21 安徽建筑大学 A method of being catalyzed persulfate rhodamine B degradation using chitosan coating Nanoscale Iron

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