CN106362722A - Method for preparing photocatalyst - Google Patents

Method for preparing photocatalyst Download PDF

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Publication number
CN106362722A
CN106362722A CN201610777314.1A CN201610777314A CN106362722A CN 106362722 A CN106362722 A CN 106362722A CN 201610777314 A CN201610777314 A CN 201610777314A CN 106362722 A CN106362722 A CN 106362722A
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China
Prior art keywords
zno
tio
beaker
preparation
vacuum drying
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CN201610777314.1A
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Chinese (zh)
Inventor
乐长高
谢宇
陈玺茜
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East China Institute of Technology
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East China Institute of Technology
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Priority to CN201610777314.1A priority Critical patent/CN106362722A/en
Publication of CN106362722A publication Critical patent/CN106362722A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/06Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of zinc, cadmium or mercury
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/30Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39Photocatalytic properties
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/30Treatment of water, waste water, or sewage by irradiation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/308Dyes; Colorants; Fluorescent agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/34Organic compounds containing oxygen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/38Organic compounds containing nitrogen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/10Photocatalysts

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Catalysts (AREA)

Abstract

The invention provides a method for preparing a photocatalyst. Weighed Zn(SO)2.6H2O and hexamethylene tetramine are dissolved in a 100 mL beaker containing magnets, deionized water is added, then the mixture is placed in oil bath at 90 DEG C to react for 8 h, then cooled to room temperature and subjected to suction filtration in a vacuum drying box at 60 DEG C to be dried for 24 h, and ZnO nanosheets are obtained. ZnO and TiO2 with a close band gap (Eg=3.37 eV) are used, and compared with TiO2, ZnO has a direct band gap and high electron mobility. Researches show that when ZnO degrades organic pollutants, the photocatalytic effect is better than that of TiO2, titanium dioxide grows on ZnO by preparing a heterojunction, and accordingly the sizes of two substances in the formed heterojunction happen to be a proper size.

Description

A kind of preparation method of photocatalyst
Technical field
The present invention relates to a kind of catalyst, more particularly, to a kind of preparation method of photocatalyst.
Background technology
Photocatalyst, as a kind of green catalyst, achieves huge progress in recent years.Promote light-catalyzed reaction research Enormous motivation derives from the strong request of clean manufacturing energy crisis environmental conservation, and the potential exploration of photocatalyst itself It is worth and application potential.Photocatalyst of zinc oxide can be exhibited one's skill to the full in environmental conservation, and its powerful catalytic degradation ability can To allow overwhelming majority pollution turn materially innocuous substance, it is that water conservation contributes, country and enterprise row can be solved in the lump Put the problem of sewage.Using zno, noxious substance cn- is degraded to innocuous substance co2, n2, no3-.Because light-catalyzed reaction meets Low energy consumption, the environmentally friendly favor having obtained numerous scholars, in the last few years, scientist deeply grinds to light-catalyzed reaction Study carefully, achieved with encouraging success, thus light-catalyzed reaction has become as an important method of catalytic reaction.
Surface sensitization is that photolytic activity sensitizer is adsorbed in zno surface, and under illumination, sensitizing molecules absorb photon and are produced from By electronics, free electron transfers to zno surface, and the valence band of photosensitizer is then transferred in the hole producing after zno is excited simultaneously, makes Its absorption spectrum moves to visible light direction, thus extending the scope of zno absorbing wavelength, improves visible light photocatalysis efficiency.Half Conductor be combined be using two kinds of quasiconductor components between conduction band and valence band difference, so that photo-generated carrier is sufficiently separated, and extend multiple The spectral response range of fit system, reaches the purpose of lifting photocatalysis efficiency.
By having consulted substantial amounts of scientific literature, to zno/tio2Photocatalyst photocatalyst has carried out deep discussion. Also ratio is larger for the impact of nanoparticle size, and activity can change with the change of granular size.When this hetero-junctions is subject to more than it After the photon irradiation of forbidden band wide band energy, produce photohole and light induced electron on its surface, light induced electron is given birth to oxygen reaction Become superoxipe ion o2−, a lot of difficult Organic substances decomposing can be resolved into co2, h2The inorganic matters such as o.Preferably special based on these Property, we only need to find a kind of preferable preparation method and preferably be combined zinc oxide and titanium dioxide, and we are with regard to permissible Produce the photocatalyst of function admirable..
Content of the invention
It is an object of the invention to provide a kind of preparation method of photocatalyst, the present invention is using the preparation of high temperature hydro-thermal method zno/tio2Photocatalyst, and the preparation scheme of this photocatalyst is improved.Carry out after being successfully prepared, to zno/tio2Light Catalyst carries out the test of catalytic performance, using this catalyst degradating organic dye, measures its catalytic efficiency size, and Allow it to be compared with other photocatalysts, its photocatalysis efficiency is evaluated and tested, find deficiency therein, then it is carried out Modification or improvement preparation method, by multiple comparison, prepare the catalyst of more excellent performance so as to possess higher catalysis Performance.
The present invention is realized by following steps:
1st, the preparation of zno nanometer sheet:
By the zn(so weighing4)2·6h2O and hexamethylenetetramine are dissolved in the 100 ml beakers being placed with Magnetitum, add deionization Water, wherein zn(so4)2·6h2The mol ratio of o, hexamethylenetetramine and deionized water is 1:1-1.1:1, puts into 90 DEG C afterwards Oil bath pan reacts 8 h, is cooled to room temperature, and sucking filtration is dried 24 h in 60 DEG C of vacuum drying oven, obtains zno nanometer sheet;
2、zno/tio2Preparation:
Take a beaker all to add isopropanol in beaker, add above-mentioned obtain zno, beaker is placed in ultrasonic machine, ultrasonic molten Solution, after the completion of dissolving, then Deca metatitanic acid second butyl ester (tip) and diethylenetriamine (deta) continue ultrasonic dissolution 40 min respectively, Transfer to 50 ml autoclaves, be then placed in 200 DEG C of baking ovens, heat 24 h, after having reacted cooling, pour the big examination of centrifugation into Carry out labelling in pipe, and be centrifuged, in respectively deionized water and washing with alcohol three times, be centrifuged 8000 r/min, obtain product and put Enter 60 DEG C of vacuum drying, vacuum drying time 24 h in vacuum drying oven, final product puts into Muffle furnace 400 DEG C/2 h, speed The general 1 DEG C/min of rate carries out Quenching Treatment of annealing, thus preparing zno:tio2Mass percent is the zno/tio of 20%-80%2Urge Agent.
The solution have the advantages that: the present invention utilizes zno and tio2There is close energy gap (eg=3.37 ev), With tio2Compare, zno has direct band gap, high electron mobility, research shows, zno, in the organic pollution of degraded, has Compare tio2Preferably photocatalysis effect, the preparation of hetero-junctions allows titania growth so that the hetero-junctions being formed on zno In two kinds of matter dimensions reach a kind of size being just suitable for, by sem collection of illustrative plates can be seen that 40 % proportioning groups are formed different Matter is tied, and form is good, and hetero-junctions surface is uniformly regular.The bright 40 % proportioning groups of chart of degraded methyl orange have fabulous for methyl orange Photocatalysis effect.
Brief description
Fig. 1 is the result test chart of the zno product sem of case study on implementation 1 preparation.
Fig. 2 is 40 %zno/tio of case study on implementation 3 preparation2The result test chart of product sem.
Fig. 3 is the tio of case study on implementation 6 preparation2The result test chart of product sem.
Fig. 4 prepares the result test chart of product degraded methyl orange for case study on implementation 1-6.
Specific embodiment
To describe the present invention in detail below in conjunction with embodiment 1-5 to be had the advantage that it is intended to help reader more Understand well the essence of the present invention, but any restriction can not be constituted to the enforcement of the present invention and protection domain.
Case study on implementation 1:
Weigh 5.3548 g zn(so4)2·6h2O and 2.5234 g hexamethylenetetramines.Alleged acquirement medicine is dissolved in 100 ml In beaker, inside there are 60 ml deionized waters.Add Magnetitum, put into 90 DEG C of oil bath pans and react 8 h.It is cooled to room temperature, sucking filtration is 60 DEG C vacuum drying oven in be dried 24 h.
Case study on implementation 2:
Take a beaker to add 55 ml isopropanols in beaker, add the zno that 0.5 gzno(is prepared by case study on implementation 1), will Beaker is placed in ultrasonic machine, ultrasonic dissolution, after the completion of dissolving, then Deca 0.18 ml metatitanic acid second butyl ester (tip) and 0.03 ml bis- Ethylene triamine (deta) continues ultrasonic 40 min, transfers to 50 ml autoclaves, is then placed in 200 DEG C of baking ovens, heating 24 h.After having reacted cooling, pour in centrifugation Boiling tube and carry out labelling, and be centrifuged, in deionized water and washing with alcohol respectively Three times, it is centrifuged 8000 r/min.Obtain product and put into 60 DEG C of vacuum drying, 24 h in vacuum drying oven.Final product puts into horse Not stove 400 DEG C/2 h, the general 1 DEG C/min of speed carry out Quenching Treatment of annealing.Prepare tio2Doping content is 20 %zno/ tio2Catalyst.
Case study on implementation 3:
Take a beaker to add 55 ml isopropanols in beaker, add the zno that 0.5 gzno(is prepared by case study on implementation 1), will Beaker is placed in ultrasonic machine, ultrasonic dissolution, after the completion of dissolving, then Deca 0.36 ml metatitanic acid second butyl ester (tip) and 0.06 ml bis- Ethylene triamine (deta) continues ultrasonic 40 min, transfers to 50 ml autoclaves, is then placed in 200 DEG C of baking ovens, heating 24 h.After having reacted cooling, pour in centrifugation Boiling tube and carry out labelling, and be centrifuged, in deionized water and washing with alcohol respectively Three times, it is centrifuged 8000 r/min.Obtain product and put into 60 DEG C of vacuum drying, 24 h in vacuum drying oven.Final product puts into horse Not stove 400 DEG C/2 h, the general 1 DEG C/min of speed carry out Quenching Treatment of annealing.Prepare tio2Doping content is 40 %zno/ tio2Catalyst.
Case study on implementation 4:
Take a beaker to add 55 ml isopropanols in beaker, add the zno that 0.5 gzno(is prepared by case study on implementation 1), will Beaker is placed in ultrasonic machine, ultrasonic dissolution, after the completion of dissolving, then Deca 0.72 ml metatitanic acid second butyl ester (tip) and 0.12 ml bis- Ethylene triamine (deta) continues ultrasonic 40 min, transfers to 50 ml autoclaves, is then placed in 200 DEG C of baking ovens, heating 24 h.After having reacted cooling, pour in centrifugation Boiling tube and carry out labelling, and be centrifuged, in deionized water and washing with alcohol respectively Three times, it is centrifuged 8000 r/min.Obtain product and put into 60 DEG C of vacuum drying, 24 h in vacuum drying oven.Final product puts into horse Not stove 400 DEG C/2 h, the general 1 DEG C/min of speed carry out Quenching Treatment of annealing.Prepare tio2Doping content is 60 %zno/ tio2Catalyst.
Case study on implementation 5:
Take a beaker to add 55 ml isopropanols in beaker, add the zno that 0.5 gzno(is prepared by case study on implementation 1), will Beaker is placed in ultrasonic machine, ultrasonic dissolution, after the completion of dissolving, then Deca 1.44 ml metatitanic acid second butyl ester (tip) and 0.24 ml bis- Ethylene triamine (deta) continues ultrasonic 40 min, transfers to 50 ml autoclaves, is then placed in 200 DEG C of baking ovens, heating 24 h.After having reacted cooling, pour in centrifugation Boiling tube and carry out labelling, and be centrifuged, in deionized water and washing with alcohol respectively Three times, it is centrifuged 8000 r/min.Obtain product and put into 60 DEG C of vacuum drying, 24 h in vacuum drying oven.Final product puts into horse Not stove 400 DEG C/2 h, the general 1 DEG C/min of speed carry out Quenching Treatment of annealing.Prepare tio2Doping content is 80 %zno/ tio2Catalyst.
Case study on implementation 6:
A beaker is taken to add 55 ml isopropanols, Deca 3 ml metatitanic acid second butyl ester (tip) and 0.5 ml diethylenetriamine in beaker (deta) ultrasonic 40 min, transfer to 50 ml autoclaves, are then placed in 200 DEG C of baking ovens, heat 24 h.React cold But after, pour in centrifugation Boiling tube and carry out labelling, and be centrifuged, in deionized water respectively and washing with alcohol three times, be centrifuged 8000 r/min.Obtain product and put into 60 DEG C of vacuum drying, 24 h in vacuum drying oven.Final product puts into Muffle furnace 400 DEG C/2 H, the general 1 DEG C/min of speed carry out Quenching Treatment of annealing.Prepare pure tio2Catalyst.
Embodiment described above is only that the preferred embodiment of the present invention is described, the not model to the present invention Enclose and be defined, on the premise of without departing from design spirit of the present invention, the technical side to the present invention for the those of ordinary skill in the art Various modifications and improvement that case is made, all should fall in the protection domain of claims of the present invention determination.

Claims (1)

1. a kind of preparation method of photocatalyst, the preparation of (1) zno nanometer sheet: by the zn(so weighing4)2·6h2O and six first Urotropine is dissolved in the 100 ml beakers being placed with Magnetitum, adds deionized water, wherein zn(so4)2·6h2O, hexamethylenetetramine It is 1:1-1.1:1 with the mol ratio of deionized water, puts into 90 DEG C of oil bath pans afterwards and react 8 h, be cooled to room temperature, sucking filtration is 60 DEG C vacuum drying oven in be dried 24 h, obtain zno nanometer sheet;(2) zno/tio2Preparation: take a beaker in beaker all plus Enter isopropanol, add zno, beaker is placed in ultrasonic machine, ultrasonic dissolution, after the completion of dissolving, then Deca metatitanic acid second fourth respectively Ester (tip) continues ultrasonic dissolution 40 min with diethylenetriamine (deta), transfers to 50 ml autoclaves, is then placed in 200 In DEG C baking oven, heat 24 h, after react cooling, pour into be centrifuged in Boiling tube and carry out labelling, and be centrifuged, using deionization respectively Water and washing with alcohol three times, are centrifuged 8000 r/min, obtain product and put into 60 DEG C of vacuum drying in vacuum drying oven, vacuum is done Dry time 24 h, final product puts into Muffle furnace 400 DEG C/2 h, and the general 1 DEG C/min of speed carries out Quenching Treatment of annealing, thus Preparation zno:tio2Mass percent is the zno/tio of 20%-80%2Catalyst.
CN201610777314.1A 2016-08-31 2016-08-31 Method for preparing photocatalyst Pending CN106362722A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106111107A (en) * 2016-06-27 2016-11-16 南昌航空大学 A kind of Zinc oxide nano sheet catalyst of titania additive

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106111107A (en) * 2016-06-27 2016-11-16 南昌航空大学 A kind of Zinc oxide nano sheet catalyst of titania additive

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Application publication date: 20170201