CN106807408A

CN106807408A - Ce(IO3)4Application

Info

Publication number: CN106807408A
Application number: CN201510851367.9A
Authority: CN
Inventors: 汤建庭; 李佳胤; 成奋民; 岳明; 黄朋
Original assignee: Hunan University of Science and Technology
Current assignee: Chongqing Three Gorges University
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2017-06-09
Anticipated expiration: 2035-11-30
Also published as: CN106807408B

Abstract

The invention discloses a kind of Ce (IO₃)₄Application, the application example of this compound is provided first., used as catalyst, can degrade organic dye pollutant under the room temperature condition of complete lucifuge for it.Ce(IO₃)₄The catalytic degradation rhodamine B under the conditions of complete lucifuge（RhB）And methyl orange（MO）The activity of dyestuff, hence it is evident that higher than the commodity titanium dioxide under radiation of visible light（P25）Photochemical catalyst.Ce (IO of the present invention₃)₄During catalytic degradation dyestuff, it is higher to be not required to illumination, activity, and its preparation method is simple, preparation condition gentle, is conducive to popularization and application.

Description

Ce(IO3)4Application

Technical field

The invention belongs to technical field of environment pollution control, it is related to Ce (IO₃)₄Compound exists as a kind of new catalyst Application in degradating organic dye pollutant.

Background technology

With the increase of population, global printing and dyeing industry size constantly expands, a large amount of organic dyestuff of industry discharge Pollutant, it has also become the important sources of whole world water pollution.Photocatalitic Technique of Semiconductor can directly utilize sunshine at room temperature By dyestuff contaminant efficiently oxidative degradation.Therefore, by photocatalysis technology, sunshine is made full use of to carry out degradation of dye pollutant It is a beneficial way of Enviromental Pollution Treatment.Because ultraviolet light only accounts for 4% of sunshine gross energy or so, and visible ray is accounted for 46% or so, so it is critical only that using the visible ray in sunshine using solar energy.Therefore, it is seen that the light of photoresponse type is urged Agent has important application prospect in current field of environmental improvement.However, because the limitation of band structure, along with light high Raw Carrier recombination rate, it is seen that the activity and durability of photocatalyst for degrading dyestuff contaminant are typically relatively low.

Another beneficial way of degradation of dye pollutant is, not by illumination, catalysis to be used under the room temperature condition of energy-conservation Agent carries out catalytic degradation.Development high activity, the catalyst of high durability are for dyestuff contaminant under no light, room temperature condition Degraded, has important practical prospect and learning value in field of environment pollution control.

Many catalyst can show catalysis activity, or even activity high under conditions of having illumination, but this activity Obtain, usually to this condition of illumination highly dependent upon.If intensity of illumination is very weak, or without illumination, then cannot show to urge Change activity, this causes that the application of catalyst is restricted.

Ce(IO₃)₄It is a kind of inorganic compound, although its preparation method and the early document report of composition identification, but mesh It is preceding not yet to have patent and document report Ce (IO₃)₄Application study, especially it as catalyst application study.

The content of the invention

Present invention aim at offer Ce (IO₃)₄Compound provides this first in a kind of new opplication of field of environmental improvement The application example of compound.

The technical scheme is that：

A kind of Ce (IO₃)₄Application, Ce (IO₃)₄It is as catalyst degradation organic dye pollutant, the step of concrete application：

（1）With organic dye pollutant as substrate, with Ce (IO₃)₄For catalyst carries out catalytic degradation；

（2）Ce(IO₃)₄The activity rating of catalyst：The degradation rate of organic dye pollutant is determined, it is degradable required with its Time weigh its catalysis activity；

Above-mentioned Ce (IO₃)₄Application, described organic dye pollutant is preferably rhodamine B（RhB）Or methyl orange（MO）, Described catalytic degradation, temperature is 10-25 DEG C, and illumination condition is complete lucifuge or natural light irradiation.

The beneficial effects of the present invention are：

（1）Test result indicate that, Ce (IO₃)₄Even if catalytic degradation activity under conditions of complete lucifuge, also significantly greater than may be used The commercial titanium dioxide seen under light irradiation（P25）Photochemical catalyst, solves the problems, such as that existing catalyst activity is low, while solving The problem of the active heavy dependence illumination condition of existing photochemical catalyst.

（2）Ce (IO of the invention₃)₄Method for preparing catalyst is simple, preparation condition is gentle, is conducive to popularization and application.

Brief description of the drawings

Fig. 1 is Ce (IO prepared by the embodiment of the present invention 1₃)₄The SEM figures of catalyst.

Fig. 2 is Ce (IO prepared by the embodiment of the present invention 1₃)₄The EDS results of catalyst.

Fig. 3 is Ce (IO prepared by the embodiment of the present invention 1₃)₄With the Activity Results figure of P25 photocatalyst for degrading RhB dyestuffs. Wherein, C₀The initial concentration of RhB before being added for catalyst, C is the concentration of RhB under any instant in catalytic process.

Fig. 4 is Ce (IO prepared by the embodiment of the present invention 1₃)₄With the Activity Results figure of P25 photocatalyst for degrading MO dyestuffs.Its In, C₀The initial concentration of MO before being added for catalyst, C is the concentration of MO under any instant in catalytic process.

Specific embodiment

Here is Ce (IO of the present invention₃)₄With the specific embodiment of application study, following examples are further intended to specifically The bright present invention, is not intended to limit the present invention.

Embodiment 1

（1）Ce(IO₃)₄Preparation

By 1 mmol ammonium ceric nitrates（(NH₄)₂Ce(NO₃)₆）40 mL deionized waters, obtain ceric ammonium nitrate solution.By 4 mmol's Sodium iodate（NaIO₃）40 mL deionized waters are dissolved in, sodium iodide solution is obtained.At room temperature, in the process of stirring sodium iodide solution In, ammonium ceric nitrate is added dropwise in sodium iodide solution.After completion of dropping, continue to stir 1 h.By gained precipitation deionized water Wash twice（Every time with the mL of deionized water 50）, after centrifugation, the h of oven drying 12 that temperature is 60 DEG C is placed in, obtain final product Ce (IO₃)₄Sample.

（2）Ce(IO₃)₄Sign

The SEM of Fig. 1 schemes visible, Ce (IO₃)₄Sample has the random pattern of 0.1-10 nm sizes.The EDS of the SEM figures of Fig. 2 Result shows that contained atom Ce, I, O number ratio of sample is close to 1: 4 :12, this explanation Ce (IO₃)₄Sample is successfully made It is standby.

（3）Ce(IO₃)₄The activity rating of catalyst degradation MO dyestuff contaminants

By gained Ce (IO₃)₄Sample is degraded substrate with RhB or MO, carries out catalytically active assessment, and by its Activity Results with P25 photochemical catalysts are contrasted.

①Ce(IO₃)₄The active testing of catalytic degradation RhB

By the Ce (IO of 150 mg₃)₄Catalyst is placed in the RhB solution that 100 mL concentration are 10 mg/L（It is contained in the spacious of 400 mL Mouth beaker）In, in the stirring at room temperature of complete lucifuge.Sampled in different time points respectively, supernatant is taken after centrifugation, will be upper Clear liquid dilution obtains sample.Use ultraviolet specrophotometer（General analysis TU1810, Beijing Puxi General Instrument Co., Ltd）Survey Determine absorbance of the sample at 554 nm.The RhB concentration of sample is calculated finally according to concentration-absorbance standard curve.

②Ce(IO₃)₄The active testing of catalytic degradation MO

By the Ce (IO of 150 mg₃)₄Catalyst is placed in the MO solution that 100 mL concentration are 10 mg/L（It is contained in the spacious of 400 mL Mouth beaker）In, in the stirring at room temperature of complete lucifuge.Sampled in different time points respectively, supernatant is taken after centrifugation, will be upper Clear liquid dilution obtains sample.Use ultraviolet specrophotometer（General analysis TU1810, Beijing Puxi General Instrument Co., Ltd）Survey Determine absorbance of the sample at 465 nm.The MO concentration of sample is calculated finally according to concentration-absorbance standard curve.

3. the active testing of P25 photocatalytic degradations RhB

The P25 of 150 mg is placed in the RhB solution that 100 mL concentration are 10 mg/L（It is contained in the uncovered beaker of 400 mL）In, Lucifuge stirs 40 min at room temperature, rhodamine molecule is reached absorption-desorption equilibrium on P25 surfaces.Then 500W xenon lamps are opened （PLS-SXE300, Beijing Bo Feilai Science and Technology Ltd.s）, light of the wavelength less than 420nm, RhB liquid level of solution are filtered off with optical filter Immediately below xenon lamp, the distance between liquid level and fluorescent tube center are 14 centimetres（Irradiation level is 400 mW/cm²）.So process Preferably illumination condition is to provide for, so as to ensure that P25 can fully show its catalysis activity.Respectively in different time points Sampling, takes supernatant after centrifugation, supernatant dilution is obtained into sample.Use ultraviolet specrophotometer（General analysis TU1810, Beijing Pu Xi all purpose instruments Co., Ltd）Determine absorbance of the sample at 554 nm.It is bent finally according to concentration-absorbance standard Line calculates the RhB concentration of sample.

4. the active testing of P25 photocatalytic degradations MO

The P25 of 150 mg is placed in the MO solution that 100 mL concentration are 10 mg/L（It is contained in the uncovered beaker of 400 mL）In, room The lower lucifuge of temperature stirs 40 min, rhodamine molecule is reached absorption-desorption equilibrium on P25 surfaces.Then 500W xenon lamps are opened （PLS-SXE300, Beijing Bo Feilai Science and Technology Ltd.s）, light of the wavelength less than 420nm, MO liquid level of solution are filtered off with optical filter Immediately below xenon lamp, the distance between liquid level and fluorescent tube center are 14 centimetres（Irradiation level is 400 mW/cm²）.So process Preferably illumination condition is to provide for, so as to ensure that P25 can fully show its catalysis activity.Respectively in different time points Sampling, takes supernatant after centrifugation, supernatant dilution is obtained into sample.Use ultraviolet specrophotometer（General analysis TU1810, Beijing Pu Xi all purpose instruments Co., Ltd）Determine absorbance of the sample at 465 nm.It is bent finally according to concentration-absorbance standard Line calculates the MO concentration of sample.

As seen from Figure 3, the random time point within 0-80 min, Ce (IO₃)₄The corresponding C/C of catalyst₀Value is all obvious C/C corresponding less than P25 photochemical catalysts₀.From fig. 4, it can be seen that the random time point within 0-70 min, Ce (IO₃)₄Catalyst Corresponding C/C₀Value is all significantly lower than the corresponding C/C of P25 photochemical catalysts₀.Even if this explanation gives P25 photochemical catalysts preferably light According to condition, and to Ce (IO₃)₄Carry out lucifuge treatment, Ce (IO₃)₄The activity of catalyst degradation RhB or MO is also apparently higher than P25 light Catalyst.Therefore, Ce (IO₃)₄Catalyst degradation RhB or MO are an energy-conservation, efficient process, in terms of environmental pollution improvement There is potential application prospect.

Claims

1. a kind of Ce (IO₃)₄Application, it is characterised in that Ce (IO₃)₄As catalyst degradation organic dye pollutant, specifically should With the step of be：

（2）Ce(IO₃)₄The activity rating of catalyst：The degradation rate of organic dye pollutant is determined, it is degradable required with its Time weigh its catalysis activity.

2. Ce (IO according to claim 1₃)₄Application, it is characterised in that：Described organic dye pollutant is Luo Dan Bright B or methyl orange.

3. Ce (IO according to claim 1₃)₄Application, it is characterised in that：Described catalytic degradation, temperature is 10-25 DEG C, illumination condition is complete lucifuge or natural light irradiation.