CN105170137A

CN105170137A - Preparation method of a Bi2WO6 photocatalyst with cubic structure

Info

Publication number: CN105170137A
Application number: CN201510298204.2A
Authority: CN
Inventors: 吕华; 刘玉民; 丁志伟; 王键吉
Original assignee: Henan Normal University
Current assignee: Henan Normal University
Priority date: 2015-06-03
Filing date: 2015-06-03
Publication date: 2015-12-23
Anticipated expiration: 2035-06-03
Also published as: CN105170137B

Abstract

The present invention discloses a preparation method of a Bi2WO6 photocatalyst with cubic structure. The method comprises the steps of: (1) preparing bismuth nitrate and sodium tungstate respectively with deionized water into an aqueous solution of bismuth nitrate and an aqueous solution of sodium tungstate, and adding L-lysine to the aqueous solution of sodium tungstate under stirring conditions to form a mixed solution; (2) adding the aqueous solution of bismuth nitrate obtained in the step (1) into the mixed solution, uniformly mixing, then adjusting the pH of the reaction system to 0.5-3 by using nitric acid, and then transferring the mixed solution to a microwave hydrothermal reactor, and maintaining for 5-30 min at 140-180 DEG C; and (3) cooling, centrifuging, washing and drying after the reaction to obtain the Bi2WO6 photocatalyst with cubic structure and high catalytic activity. The preparation method has the advantages of simpleness, fast reaction rate, high yield and easiness to control.

Description

A kind of Bi with cubic structure 2wO 6the preparation method of photochemical catalyst

Technical field

The invention belongs to Bi ₂wO ₆the synthesis technical field of photochemical catalyst, is specifically related to a kind of Bi with cubic structure ₂wO ₆the preparation method of photochemical catalyst.

Background technology

Along with the environmental pollution day by day increased the weight of, photocatalysis technology Environment control problem is utilized to become one of most active research field in recent years.The degraded of photocatalysis technology environmental pollution has that energy consumption is low, purification condition is gentle and the advantage such as non-secondary pollution and attention.In numerous conductor photocatalysis materials, as a kind of novel catalysis material Bi ₂wO ₆because of its narrower energy gap (about 2.7eV), can be there is higher catalytic activity and higher organic matter degradation ability under visible light and cause increasing concern by excited by visible light.Therefore, Bi ₂wO ₆the research of catalysis material, by opening up a new approach for photocatalysis removal and degradable organic pollutant, has very important practical value in the depollution of environment and new energy development.

As everyone knows, the performance of photochemical catalyst and its structure, pattern and crystallinity connect each other, therefore find a kind of there is special construction and the preparation method of the excellent bismuth tungstate photocatalyst of photocatalysis performance become particularly important.Biomimetic synthesis technology be with large biological molecule or biological organic matter self-assembly for template, the coring and increment of inorganic matter is regulated, and then synthesizes the nano-functional material with diverse microcosmic appearance.In numerous biological template agent, 1B has the advantages such as nontoxic and good biocompatibility, is the very wide template of a kind of application prospect.

Summary of the invention

The technical problem that the present invention solves there is provided that a kind of simple to operate, reaction rate is fast, productive rate is higher and the Bi with cubic structure that crystal morphology is controlled ₂wO ₆the preparation method of photochemical catalyst.

The present invention adopts following technical scheme, a kind of Bi with cubic structure for solving the problems of the technologies described above ₂wO ₆the preparation method of photochemical catalyst, is characterized in that comprising the following steps: (1) is with bismuth nitrate (Bi (NO ₃) ₃5H ₂o), sodium tungstate (Na ₂wO ₄2H ₂o), 1B and deionized water are raw material, respectively bismuth nitrate and sodium tungstate and deionized water are mixed with aqueous bismuth nitrate solution and the sodium tungstate aqueous solution, then joined in the sodium tungstate aqueous solution by 1B under the condition stirred and form mixed solution, wherein the mol ratio of 1B and sodium tungstate is 0.5-2:1; (2) under the condition stirred, aqueous bismuth nitrate solution to be joined in the mixed solution that step (1) obtains and to mix, wherein the mol ratio of bismuth nitrate and sodium tungstate is 2:1, regulate the pH value of reaction system to be 0.5-3 with nitric acid again, then the mixed solution of gained is moved in microwave hydrothermal reaction kettle and keep 5-30 minute in 140-180 DEG C; (3) reaction terminate after through cooling, centrifugal, washing, obtain having the Bi of cubic structure and high catalytic activity after drying ₂wO ₆photochemical catalyst.

Further restriction, in the sodium tungstate aqueous solution described in step (1) and aqueous bismuth nitrate solution, the molar concentration of sodium tungstate and bismuth nitrate is respectively 0.1-0.3mol/L.

The present invention compared with prior art has following remarkable advantage: 1, prepared Bi ₂wO ₆the pattern of photochemical catalyst is cubic structure, has good crystallinity and good photocatalytic activity; 2, Morphological control agent is nontoxic and has good biocompatibility; 3, preparation method is simple, and reaction rate is fast, and productive rate is high and be easy to control.

Accompanying drawing explanation

Fig. 1 is the Bi that the embodiment of the present invention 2 obtains ₂wO ₆the scanning electron microscope (SEM) photograph of photochemical catalyst, Fig. 2 is under the xenon lamp of 300W irradiates, the bismuth tungstate (Bi that the embodiment of the present invention 2 is obtained ₂wO ₆-1B) photochemical catalyst and do not use 1B to prepare bismuth tungstate (Bi ₂wO ₆) to rhodamine B degraded correlation curve (operating condition: catalytic amount: 0.5g/L; The concentration of rhodamine B: 50mg/L).

Detailed description of the invention

Be described in further details foregoing of the present invention by the following examples, but this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on foregoing of the present invention all belong to scope of the present invention.

Embodiment 1

(1) the sodium tungstate aqueous solution 20mL that molar concentration is 0.1mol/L is prepared, under agitation 0.18gL-lysine is joined in the sodium tungstate aqueous solution to mix and obtain mixed solution, then prepare the aqueous bismuth nitrate solution 40mL that molar concentration is 0.1mol/L;

(2) dropwise joined in mixed solution by aqueous bismuth nitrate solution under the condition stirred, the pH value regulating reaction system with nitric acid is 0.5, is then transferred to by the mixed solution of gained in microwave hydrothermal reaction kettle and keeps 30 minutes in 140 DEG C;

(3) reaction terminate after through cooling, centrifugal, washing, obtain having the Bi of cube structure and high catalytic activity after drying ₂wO ₆photochemical catalyst.

Embodiment 2

(1) the sodium tungstate aqueous solution 20mL that molar concentration is 0.2mol/L is prepared, under agitation 0.72gL-lysine is joined in the sodium tungstate aqueous solution to mix and obtain mixed solution, then prepare the aqueous bismuth nitrate solution 40mL that molar concentration is 0.2mol/L;

(2) dropwise joined in mixed solution by aqueous bismuth nitrate solution under the condition stirred, the pH value regulating reaction system with nitric acid is 1.0, is then transferred to by the mixed solution of gained in microwave hydrothermal reaction kettle and keeps 20 minutes in 160 DEG C;

Fig. 1 is the Bi that the present embodiment obtains ₂wO ₆the scanning electron microscope (SEM) photograph of photochemical catalyst, as seen from the figure, obtained Bi ₂wO ₆photochemical catalyst has cube structure.Fig. 2 is the bismuth tungstate (Bi that the present embodiment obtains ₂wO ₆-1B) photochemical catalyst and do not use 1B to prepare bismuth tungstate (Bi ₂wO ₆) to rhodamine B degraded correlation curve, as seen from the figure, the bismuth tungstate (Bi that the present embodiment is obtained ₂wO ₆-1B) photochemical catalyst has higher photocatalytic activity.

Embodiment 3

(1) the sodium tungstate aqueous solution 20mL that molar concentration is 0.3mol/L is prepared, under agitation 2.16gL-lysine is joined in the sodium tungstate aqueous solution to mix and obtain mixed solution, then prepare the aqueous bismuth nitrate solution 40mL that molar concentration is 0.3mol/L;

(2) dropwise joined in mixed solution by aqueous bismuth nitrate solution under the condition stirred, the pH value regulating reaction system with nitric acid is 3.0, is then transferred to by the mixed solution of gained in microwave hydrothermal reaction kettle and keeps 5 minutes in 180 DEG C;

Embodiment above describes general principle of the present invention, principal character and advantage; the technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; under the scope not departing from the principle of the invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the scope of protection of the invention.

Claims

1. one kind has the Bi of cubic structure ₂wO ₆the preparation method of photochemical catalyst, it is characterized in that comprising the following steps: (1) with bismuth nitrate, sodium tungstate, 1B and deionized water for raw material, respectively bismuth nitrate and sodium tungstate and deionized water are mixed with aqueous bismuth nitrate solution and the sodium tungstate aqueous solution, then joined in the sodium tungstate aqueous solution by 1B under the condition stirred and form mixed solution, wherein the mol ratio of 1B and sodium tungstate is 0.5-2:1; (2) under the condition stirred, aqueous bismuth nitrate solution to be joined in the mixed solution that step (1) obtains and to mix, wherein the mol ratio of bismuth nitrate and sodium tungstate is 2:1, regulate the pH value of reaction system to be 0.5-3 with nitric acid again, then the mixed solution of gained is moved in microwave hydrothermal reaction kettle and keep 5-30 minute in 140-180 DEG C; (3) reaction terminate after through cooling, centrifugal, washing, obtain having the Bi of cubic structure and high catalytic activity after drying ₂wO ₆photochemical catalyst.

2. the Bi with cubic structure according to claim 1 ₂wO ₆the preparation method of photochemical catalyst, is characterized in that: in the sodium tungstate aqueous solution described in step (1) and aqueous bismuth nitrate solution, the molar concentration of sodium tungstate and bismuth nitrate is respectively 0.1-0.3mol/L.