CN107101996A - A kind of real-time online dynamic detection system of pentachlorophenol degraded intermediate - Google Patents
A kind of real-time online dynamic detection system of pentachlorophenol degraded intermediate Download PDFInfo
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Abstract
The invention discloses a kind of real-time online dynamic detection system of pentachlorophenol degraded intermediate.It includes excitation source, pentachlorophenol degradation reaction container, chemical oxidation reagent container, chemiluminescence detection pond, photomultiplier and signal analyzer main frame;Pentachlorophenol degradation reaction container and chemical oxidation reagent container are connected with chemiluminescence detection pond;Photomultiplier is used to the optical signal produced in chemical detection pond changing into electric signal;Photomultiplier is connected with signal analyzer main frame, and signal analyzer main frame is connected with computer terminal.When being detected using real-time online dynamic detection system of the present invention, can on-line determination, it is simple to operate, sample need not offline be separated, the then process such as upper machine testing, therefore finding speed is fast, improve operating efficiency, it is adaptable to rapid screening and assessment of the catalysis material for pentachlorophenol ability of degrading;The system can also track TrCBQ OH and TCBQ dynamic change online, by dynamic information, track its generation and degradation process.
Description
Technical field
The present invention relates to a kind of real-time online dynamic detection system of pentachlorophenol degraded intermediate.
Background technology
Pentachlorophenol is a kind of common chlorinated aromatic organic pollution, due to the antibacterial with wide spectrum, desinsection, fire-retardant etc.
Effect, is widely used as anti-corrosion and the sterilization of the product such as industrial and agricultural production raw material and timber, coating.It can by volatilization,
The approach such as container leakage, discharge of wastewater enter environment, severe contamination air, soil, underground water and surface water.These persistence
Organic matter can cause biomutation in the reconditioning of ultra trace.Therefore, it is to work as to remove the pentachlorophenol pollutant in environment
One of main task of modern environmental problem.Light (catalysis) degradation technique due to hypotoxicity, oxidability is strong the features such as, in chlorine
Phenolic comp ' ds pollution is degraded and improvement aspect has obtained extensive concern.But in photocatalysis treatment, drop is thought in most researchs at present
The chlorophenols of solution determines the palliating degradation degree of whole course of reaction, only focuses on the degradation efficiency and influence degraded effect of chlorophenols
The external condition of rate, but often after the concentration of former degradation material meets requirement, the bigger middle production of toxicity may be produced
Thing, this just causes bigger harm to environment and human health.Therefore, research control pentachlorophenol contaminant degradation dynamic process and
It is that can degradation technique carry out the premise and key of practical application that its high toxicity intermediate, which is produced,.
Under the conditions of different photocatalysis, the degradation process and approach of pentachlorophenol are not quite similar, Antonopoulou et al.
[Environ.Sci.Pollut.Res., 2015,22,9438] reports the TiO of nitrogen/Fluorin doped2Photocatalytic degradation pentachlorophenol process
In, in condition of different pH, it may occur that its different degradation pathway;And the generation of its intermediate and poisonous effect are evaluated, recognize
Its dechlorination product TCBQ is mainly derived from for the risk of toxicity in PCP degradation processes.And Mills and Hoffmann
[Environ.Sci.Technol., 1993,27,1681] points out pentachlorophenol in TiO2In photocatalytic system, its main middle production
Thing is p- tetrachloroquinones and four chlorohydroquinones;But it, which is studied, finds, each PCP of its illumination early stage dechlorination molecular number is 1.8, in drop
Solution initial stage four, chloro thing was not unique dechlorination intermediate, was likely present de- 2 or 3 chloros benzoquinones intermediate, Preliminary Study
It is TrCBQ-OH to speculate the low chloro intermediate of this high toxicity.But at present for the research of pentachlorophenol photocatalytic degradation course of reaction
Means mainly have high performance liquid chromatography, mass spectrography etc., and these are required to addition selective probe and captured, then at some
Between point be sampled, separate, determining, with sensitivity it is low, it is cumbersome it is time-consuming, online dynamic analysis in situ can not be carried out, it is impossible to it is right
Pentachloro- phenolic comp ' ds pollution degraded toxic intermediate generating process provides enough online checking means in situ, to its photocatalytic degradation
The generation of toxic intermediate and knowledge of regularity are not enough.Therefore, a kind of real-time online dynamic detection system is set up, for toxicity chlorine
It is necessary for research pentachlorophenol degradation process, mechanism and its risk of toxicity for the dynamic monitoring of benzoquinones material.
The content of the invention
It is an object of the invention to provide a kind of real-time online dynamic detection system of pentachlorophenol degraded intermediate, the present invention will
Flow chemoluminescence method and be applied to photocatalysis field, by the way that flowing chemical photic device is combined with photocatalytic reaction device,
Realize that carrying out real-time online to the TrCBQ-OH and TCBQ that are produced in pentachlorophenol degradation process dynamically examines by chemical luminous system
Survey;Real-time online dynamic detection system of the present invention can be additionally used in assessment and the pentachlorophenol biodegrading process of various pentachlorophenol biodegrading process
Condition optimizing and pentachlorophenol degradation process in TrCBQ-OH and TCBQ generation and the research of degradation behavior.
Present invention firstly provides a kind of real-time online dynamic testing method of pentachlorophenol degraded intermediate, including following step
Suddenly:
Under photocatalysis or the catalysis of photochemical catalyst, pentachlorophenol degraded produces intermediate;Using flowing chemoluminescence method inspection
The chemiluminescence signal of the intermediate and the redox reaction product of chemical oxidation reagent is surveyed, that is, realizes and pentachlorophenol is degraded
The real-time online dynamic detection of intermediate;
The intermediate is trichlorine hydroxyl -1,4- benzoquinones (TrCBQ-OH) and four chloro- 1,4- benzoquinones (TCBQ).
In the present invention, the flowing chemoluminescence method is referred to:The centre that pentachlorophenol and its light (catalysis) reaction are produced
Body, by flow device, is continuously sent to sensing chamber and generation chemiluminescence reaction is mixed with chemical oxidation reagent, produce
Luminous signal, while the optical signal received is converted into electric signal by photomultiplier, after enhanced processing, passes through number
It is shown to according to line transmission on computer screen;And generation and the disappearance process of the direct reaction intermediate of change of signal, therefore with behaviour
Make that simple, finding speed is fast, sensitivity is high, specificity good, real-time online the advantages of, be suitable for the degraded feature of pentachlorophenol:Five
Chlorophenols photocatalytic degradation intermediate species are various, and the toxic intermediate TrCBQ-OH and TCBQ produced in reaction has concentration
The low, life-span is shorter, and easily hydrolyze and convert etc., flowing chemiluminescence analysis method is applied to pollution object light and urged by the present invention
Change the research field of degradation process, establishing pentachlorophenol photocatalytic degradation flowing chemiluminescence system is used for pentachlorophenol degradation process
The dynamic of Poisoning intermediate is produced and tracked.
In above-mentioned real-time online dynamic testing method, the chemical oxidation reagent can for hydrogen peroxide or hydrogen peroxide with
The molar concentration of hydrogen peroxide can be 0.01~0.5M in the mixed liquor of cushioning liquid, the mixed liquor, concretely 0.1M.
In above-mentioned real-time online dynamic testing method, in ultraviolet light (such as coming from mercury lamp, deuterium lamp or ultraviolet LED) or can
Degraded under the catalysis for seeing light (such as coming from xenon lamp or LED/light source) pentachlorophenol.
In above-mentioned real-time online dynamic testing method, the photochemical catalyst can use photocatalysis material of the prior art
Material, such as titanium dioxide, zinc oxide.
In above-mentioned real-time online dynamic testing method, the chemiluminescence signal is converted into by electricity using photomultiplier
Signal, transmits to computer terminal after amplified processing and is analyzed.
Based on chemiluminescence analysis method, the present invention still further provides a kind of real-time online of phenol degraded intermediate and move
State detecting system, it includes excitation source, pentachlorophenol degradation reaction container, chemical oxidation reagent container, chemiluminescence detection
Pond, photomultiplier and signal analyzer main frame;
The pentachlorophenol degradation reaction container and the chemical oxidation reagent container with the chemiluminescence detection
Pond is connected;
The photomultiplier is used to the optical signal produced in the chemical detection pond changing into electric signal;
The photomultiplier is connected with signal analyzer main frame, the signal analyzer main frame and a computer terminal phase
Connection.
In above-mentioned real-time online dynamic detection system, the pentachlorophenol degradation reaction container and the chemiluminescence detection
Peristaltic pump is provided between pond, the mixed of pentachlorophenol or pentachlorophenol and photochemical catalyst is pumped into the chemiluminescence detection pond with quantitative
Close liquid;
Peristaltic pump is provided between the chemical oxidation reagent container and the detection cell, with quantitative to the chemistry
Chemical oxidation reagent is pumped into luminescence detecting pool.
In above-mentioned real-time online dynamic detection system, the excitation source is ultraviolet lamp source (such as mercury lamp, deuterium lamp, ultraviolet
) or visible light source (such as xenon lamp, LED/light source) LED.
Real-time online dynamic detection system of the present invention can simply, quick, sensitive determine pentachlorophenol degradation process toxicity
Intermediate TrCBQ-OH and TCBQ generation and conversion, and then light reflex system quickly sieved to the degradation capability of chlorinated phenol
Look into and assess.
Real-time online dynamic detection system of the present invention can also in real time, on-line determination pentachlorophenol degradation process, it is possible to achieve
Generation and decay behavior to toxic intermediate TrCBQ-OH and TCBQ carry out real-time online track determining, are become by luminous signal
The dynamic information of change, research pentachlorophenol degradation process and mechanism, are verified, photocatalysis pH value of solution through the specific embodiment of the invention
The generation species of two kinds of intermediates can be influenceed with pentachlorophenol initial concentration, the multidate information such as concentration and time of occurrence is produced.
Real-time online dynamic detection system of the present invention can be additionally used in assessment and the pentachlorophenol drop of various pentachlorophenol biodegrading process
The condition optimizing of solution method.
Real-time online dynamic detection system of the present invention can quantify detection TrCBQ-OH and TCBQ.
The present invention has advantages below compared with the conventional method:
1) real-time online dynamic detection system of the present invention is simple in construction, and cost is low, it is easy to business promotion.
2) sensitivity of real-time online dynamic testing method of the present invention is high, specific good, overcomes in the middle of light-catalyzed reaction
Bulk concentration is low, the problems such as need sample pre-treatments.
3) using real-time online dynamic detection system of the present invention detection when, can on-line determination, it is simple to operate, it is not necessary to sample
Product are separated offline, the then process such as upper machine testing, therefore finding speed is fast, improves operating efficiency, it is adaptable to photocatalysis
Rapid screening and assessment of the material for pentachlorophenol ability of degrading.
4) when being detected using real-time online dynamic detection system of the present invention, online the real time measure can be realized, can be online
TrCBQ-OH and TCBQ dynamic change is tracked, by dynamic information, its generation and degradation process is tracked.
Brief description of the drawings
Fig. 1 is the schematic diagram of the real-time online dynamic detection system of pentachlorophenol of the present invention degraded intermediate.
Each mark is as follows in figure:
1 simulating sun light source, 2 pentachlorophenol degradation reaction containers, 3 chemical oxidation reagent containers, 4,5 peristaltic pumps, 6 chemistry
Luminescence detecting pool, 7 photomultipliers, 8 signal analyzer main frames, 9 computer terminals.
Fig. 2 is that the chemiluminescence that pentachlorophenol Photocatalytic Degradation Process high toxicity intermediate TrCBQ-OH and TCBQ are produced lights
Intensity changes with time and its compared with mass spectrometry method, and wherein Fig. 2 (a) and Fig. 2 (b) are respectively the undegraded hair with when degrading
Optical signal changes with time, TrCBQ-OH and TCBQ mass signal value during Fig. 2 (c) pentachlorophenol catalytic degradations.
Fig. 3 is that present system is used to determining standard curve obtained by TrCBQ-OH, corresponding to wherein curve a-g
The concentration of TrCBQ-OH standard liquids is respectively:0 μM, 1 μM, 2 μM, 5 μM, 8 μM, 10 μM and 20 μM.
Fig. 4 is that present system is used to determine the standard curve obtained by TCBQ, the TCBQ marks wherein corresponding to curve a-g
The concentration of quasi- solution is respectively:0 μM, 0.5 μM, 1 μM, 2 μM, 5 μM, 10 μM and 20 μM.
Fig. 5 is that present system is used in the different initial pH systems of dynamic measure produced by pentachlorophenol degradation process
TrCBQ-OH and TCBQ chemiluminescence luminous intensity changes with time, and the initial pH that wherein Fig. 5 (A) is represented is 10, Fig. 5
(B) the initial pH represented is that the initial pH that 7, Fig. 5 (C) is represented is that the initial pH that 5, Fig. 5 (D) is represented is 3.
Fig. 6 is produced in degradation process when present system determines different initial pentachlorophenol concentration for dynamic
TrCBQ-OH and TCBQ chemiluminescence luminous intensity changes with time, and the pentachlorophenol initial concentration that wherein Fig. 6 (A) is represented is
30 μM, the pentachlorophenol initial concentration that Fig. 6 (B) is represented is 20 μM, and the pentachlorophenol initial concentration that Fig. 6 (C) is represented is 10 μM.
Embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
Material, reagent used etc., unless otherwise specified, are commercially obtained in following embodiments.
Pentachlorophenol Photocatalytic Degradation Process toxic intermediate TrCBQ-OH and the TCBQ real-time online that Fig. 1 provides for the present invention
The structural representation of dynamic detection system, it includes simulating sun light source 1, pentachlorophenol photocatalytic degradation reaction vessel 2, chemical oxidation
Reagent container 3, peristaltic pump 4 and 5, chemiluminescence detection pond 6, photomultiplier 7, signal analyzer main frame 8 and computer are whole
End 9.Mercury lamp, xenon lamp, deuterium lamp or LED may be selected in simulating sun light source 1, for make pentachlorophenol light degradation produce TrCBQ-OH and
TCBQ, or for exciting photochemical catalyst, photocatalyst for degrading pentachlorophenol is produced TrCBQ-OH and TCBQ.Pentachlorophenol degraded is anti-
Answer the pentachlorophenol solution to be degraded for holding of container 2 or pentachlorophenol and photochemical catalyst mixed solution, pentachlorophenol degradation reaction
Container 2 is connected with chemiluminescence detection pond 6, and provided with a peristaltic pump 4 between them, for providing power.Chemical oxidation
Reagent container 3 is used to hold chemical oxidation reagent, and redox reaction is carried out with TrCBQ-OH and TCBQ, produces light letter
Number, to be detected.Chemical oxidation reagent container 3 is connected with chemiluminescence detection pond 6, and one is provided between them
Peristaltic pump 5, for providing power.Photomultiplier 7 is used to the optical signal produced in chemiluminescence detection pond 6 changing into telecommunications
Number, signal analyzer main frame 8 is then transmit to, signal analyzer main frame 8 is connected with computer terminal 9, and testing result is carried out
Display.
With pentachlorophenol/TiO2Exemplified by photocatalytic system, illustrate the present embodiment Real-time and Dynamic Detection system measurement pentachlorophenol light
The toxic intermediate TrCBQ-OH and TCBQ that are produced during catalytic degradation specific implementation process:
As shown in figure 1, first by finely dispersed TiO2Particle and certain density pentachlorophenol solution are transferred to pentachlorophenol
In photocatalytic degradation device, lucifuge stirring reaches the attached balance of absorption-desorption for 30 minutes.Chemical illuminating reagent is transferred to chemical hair
In light reagent container 3.When testing progress, light source 1 is opened, pentachlorophenol is carried out Photocatalytic Degradation Process and is produced
TrCBQ-OH and TCBQ.Start flow device peristaltic pump 4 and peristaltic pump 5 simultaneously, by pentachlorophenol/TiO2Mixed solution (TiO2It is dense
Spend for 0.2g/L), chemical oxidation reagent (H2O2With the mixed liquor of cushioning liquid, wherein H2O2Concentration be 0.1M) pass through pipeline
The progress biochemical reaction of hybrid concurrency in chemiluminescence detection pond 6 is sent to, chemiluminescence signal is produced.Meanwhile, positioned at chemistry
The optical signal received is converted into electric signal by the photomultiplier 7 of the lower section of luminescence detecting pool 6, after enhanced processing, is passed through
Data line transfer is on the display of computer terminal 7.When light source is not opened, pentachlorophenol can not be degraded, without TrCBQ-OH
With TCBQ generation, therefore display screen display almost very low signal is background noise (Fig. 2 (a)).Conversely, when light source is opened
Qi Shi, pentachlorophenol is in photochemical catalyst TiO2Under catalysis, degraded, the intermediate TrCBQ-OH and TCBQ of generation detection cell with
Oxidants hydrogen peroxide is mixed, and is occurred redox reaction and is produced chemiluminescence signal (Fig. 2 (b)), it is achieved thereby that to pentachloro-
Phenol degraded intermediate TrCBQ-OH and TCBQ dynamic in-situ are determined, and with the progress of pentachlorophenol Photocatalytic Degradation Process,
Intermediate TrCBQ-OH and TCBQ generation and conversion can successively occur, thus display screen display chemiluminescence signal be with
The photocatalytic degradation time gradually rises, reduces, raising again, reducing again and to obtain dynamic-change information.This chemiluminescence signal is distinguished
The dynamic that represent TrCBQ-OH (first glow peak) and TCBQ (second glow peak) is produced, generates, decays and its converted
Process.This chemiluminescence signal has very with the mass spectroscopy signal value (such as Fig. 2 (c)) in pentachlorophenol Photocatalytic Degradation Process
Good correlation.
Light source 1 is closed, pentachlorophenol solution is replaced with TrCBQ-OH standard liquids and TCBQ standard liquids respectively, be can be used for
The quantitative detection of TrCBQ-OH and TCBQ standard liquids, testing result difference is as shown in Figure 3 and Figure 4.
The concentration of TrCBQ-OH standard liquids in Fig. 3 corresponding to curve a-g is respectively:0μM、1μM、2μM、5μM、8μM、
10 μM and 20 μM.
The concentration of TCBQ standard liquids in Fig. 4 corresponding to curve a-g is respectively:0μM、0.5μM、1μM、2μM、5μM、10
μM and 20 μM.
Had well in 0.15 μM to 20 μM concentration range by TrCBQ-OH and TCBQ it can be seen from Fig. 3 and Fig. 4
Linear relationship, about 0.05 μM of test limit.
Using real-time online dynamic detection system of the present invention, (different pH and difference five have been investigated in different photocatalytic systems
Chlorophenol concentration), high toxicity intermediate TrCBQ-OH and TCBQ dynamic are produced and changed in the Photocatalytic Degradation Process of pentachlorophenol
Process.
Fig. 5 is that present system is used in the different initial pH systems of dynamic measure produced by pentachlorophenol degradation process
The initial pH=10 that TrCBQ-OH and TCBQ, wherein Fig. 5 (A) are represented;The initial pH=7 that Fig. 5 (B) is represented;What Fig. 5 (C) was represented
Initial pH=5;The initial pH=3 that Fig. 5 (D) is represented.
When Fig. 6 is that present system is used for dynamic and determines different initial pentachlorophenol concentration, produced by degradation process
Pentachlorophenol initial concentration=30 μM that TrCBQ-OH and TCBQ, wherein Fig. 6 (A) are represented;The pentachlorophenol that Fig. 6 (B) is represented is initially dense
=20 μM of degree;Pentachlorophenol initial concentration=10 μM that Fig. 6 (C) is represented.
Photocatalysis pH value of solution and pentachlorophenol initial concentration can influence two kinds of intermediates it can be seen from Fig. 5 and Fig. 6
Produce species, produce the multidate information such as concentration and time of occurrence.Illustrate that using present system pentachlorophenol photocatalysis can be realized
Degradation process toxic intermediate TrCBQ-OH and TCBQ online tracking and dynamic change, and then be the pentachloro- of research toxicity guiding
Phenol degradation process and mechanism provide support.
This invention is equally applicable to pentachlorophenol degradation process risk of toxicity under the conditions of different catalysis materials and photocatalysis
Rapid screening and assessment.
Claims (8)
- The real-time online dynamic testing method of intermediate 1. a kind of pentachlorophenol is degraded, comprises the following steps:Under photocatalysis or the catalysis of photochemical catalyst, pentachlorophenol degraded produces intermediate;Using flowing chemoluminescence method detection institute The chemiluminescence signal of intermediate and the redox reaction product of chemical oxidation reagent is stated, that is, is realized in the middle of being degraded to pentachlorophenol The real-time online dynamic detection of body;The intermediate is trichlorine hydroxyl -1,4- benzoquinones and four chloro- 1,4- benzoquinones.
- 2. real-time online dynamic testing method according to claim 1, it is characterised in that:The chemical oxidation reagent was The mixed liquor of hydrogen oxide and cushioning liquid.
- 3. real-time online dynamic testing method according to claim 1 or 2, it is characterised in that:In ultraviolet light or visible ray Catalysis under degrade the pentachlorophenol.
- 4. the real-time online dynamic testing method according to any one of claim 1-3, it is characterised in that:Using photoelectricity times Increase pipe and the chemiluminescence signal is converted into electric signal, transmit to computer terminal and analyzed after amplified processing.
- The real-time online dynamic detection system of intermediate 5. a kind of pentachlorophenol is degraded, it is characterised in that:The real-time online dynamic Detecting system include excitation source, pentachlorophenol degradation reaction container, chemical oxidation reagent container, chemiluminescence detection pond, Photomultiplier and signal analyzer main frame;The pentachlorophenol degradation reaction container and the chemical oxidation reagent container with chemiluminescence detection pond phase Connection;The photomultiplier is used to the optical signal produced in the chemical detection pond changing into electric signal;The photomultiplier is connected with signal analyzer main frame, and the signal analyzer main frame is connected with a computer terminal Connect.
- 6. real-time online dynamic detection system according to claim 5, it is characterised in that:The pentachlorophenol degradation reaction is held Peristaltic pump is provided between device and the chemiluminescence detection pond;Peristaltic pump is provided between the chemical oxidation reagent container and the detection cell.
- 7. the real-time online dynamic detection system according to claim 5 or 6, it is characterised in that:The excitation source is purple Outer lamp source or visible light source.
- 8. real-time online dynamic detection system any one of claim 5-7 it is following it is any in application:1) in pentachlorophenol degradation process intermediate dynamic detection;2) biodegrading process of pentachlorophenol is assessed;3) biodegrading process of pentachlorophenol is optimized;4) intermediate is quantitatively detected;The intermediate is trichlorine hydroxyl -1,4- benzoquinones and four chloro- 1,4- benzoquinones.
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