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A kind of preparation method of lithium lanthanum lead titanate-rgo

A lithium titanate and medium lithium titanate technology, which is applied in the field of preparation of lithium lanthanum lead titanate-rGO, can solve the problems of no patents and literature reports on the preparation method of lithium lanthanum lead titanate-rGO, no reports, etc., to achieve The effect of suppressing recombination probability, simple process method, and low production cost

Inactive Publication Date: 2020-08-25
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, the work on lithium lanthanum lead titanate-rGO composited with lithium lanthanum lead titanate and rGO with preferred (010) crystallographic surface exposure has not been reported, and there are no patents and literature reports on the preparation method of lithium lanthanum lead titanate-rGO

Method used

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  • A kind of preparation method of lithium lanthanum lead titanate-rgo
  • A kind of preparation method of lithium lanthanum lead titanate-rgo
  • A kind of preparation method of lithium lanthanum lead titanate-rgo

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Experimental program
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Effect test

Embodiment 1

[0022] Step 1, 5mmol of Pb(NO 3 ) 2 Add deionized water, stir at 30°C for 30 minutes until completely transparent, use NaOH solution to adjust the pH value of the solution to 12, and then stir the mixture at 0°C for 30 minutes to form A liquid;

[0023] Step 2, 5mmol Ti(OC 4 h 9 ) 4 Added dropwise into the ethanol solution, and then stirred at 30 °C to obtain the precursor containing precipitates.

[0024] Step 3, the precursor is added to the A solution, wherein Ti(OC 4 h 9 ) 4 with Pb(NO 3 ) 2 The molar ratio is 1:1, forming liquid B;

[0025] Step 4, the obtained liquid B was transferred into an autoclave, heated and kept at 180° C. for 24 h, and then naturally cooled to room temperature.

[0026] Step 5: After the reactor was cooled, the precipitate in the reactor was repeatedly washed three times with ethanol and deionized water, and dried at 100° C. for 12 h to obtain lead titanate.

Embodiment 2

[0028] Step 1, 4.9mmol of Pb(NO 3 ) 2 Add deionized water, stir at 30°C for 30 minutes until completely transparent, use NaOH solution to adjust the pH value of the solution to 12, and then stir the mixture at 0°C for 30 minutes to form A liquid;

[0029] Step 2, 5mmol Ti(OC 4 h 9 ) 4 Added dropwise into the ethanol solution, and then stirred at 30 °C to obtain the precursor containing precipitates.

[0030] Step 3, adding the precursor to solution A to make solution B;

[0031] Step 4, the Li(NO of 0.1mmol 3 ) and La(NO 3 ) 3 Dissolve in deionized water to make solution C, add solution C to solution B drop by drop, stir for 30 minutes to form solution D, in which Li(NO 3 ) and La(NO 3 ) 3 The molar ratio is 1:1, Ti(OC 4 h 9 ) 4 with (Pb(NO 3 ) 2 +Li(NO 3 )+La(NO 3 ) 3 ) in a molar ratio of 1:1, Ti(OC 4 h 9 ) 4 with (Li(NO 3 )+La(NO3 ) 3 ) molar ratio is 1:0.02;

[0032] Step 5, the obtained liquid D was transferred into an autoclave, heated and kept at...

Embodiment 3

[0035] Step 1, 4.9mmol of Pb(NO 3 ) 2 Add deionized water, stir at 30°C for 30 minutes until completely transparent, use NaOH solution to adjust the pH value of the solution to 12, and then stir the mixture at 0°C for 30 minutes to form A liquid;

[0036] Step 2, 5mmol Ti(OC 4 h 9 ) 4 Added dropwise into the ethanol solution, and then stirred at 30 °C to obtain the precursor containing precipitates.

[0037] Step 3, after adding the precursor to solution A, make solution B;

[0038] Step 4, the Li(NO of 0.1mmol 3 ) and La(NO 3 ) 3 Dissolve in deionized water to make solution C, add solution C to solution B drop by drop, stir for 30 minutes to form solution D, in which Li(NO 3 ) and La(NO 3 ) 3 The molar ratio is 1:1, Ti(OC 4 h 9 ) 4 with (Pb(NO 3 ) 2 +Li(NO 3 )+La(NO 3 ) 3 ) in a molar ratio of 1:1, Ti(OC 4 h 9 ) 4 with (Li(NO 3 )+La(NO 3 ) 3 ) molar ratio is 1:0.02;

[0039] Step 5, add 0.05g of rGO into liquid D, ultrasonically disperse and stir even...

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Abstract

The invention discloses a preparation method of lithium-lanthanum-lead titanate-rGO (reduced graphene oxide), which aims at solving the problems of weak light absorbing ability and poor photocatalysisactivity in the existing PbTiO3 (lead titanate). The preparation method comprises the following steps of (1) preparing a mixed solution of Ti(OC4H9)4 (tetrabutyl titanate), Pb(AC)2 (lead acetate), Li(NO3) (lithium nitrate) and La(NO3)3 (lanthanum nitrate); (2) regulating and controlling the pH (potential of hydrogen) value in a precursor solution, mixing with the rGO, and obtaining the lithium-lanthanum-lead titanate-rGO powder under the hydrothermal condition. The preparation method has the advantages that the photocatalysis activity of the PbTiO3 is improved under the action of co-doping oflithium and lanthanum, and a heterojunction structure is formed between the (010) crystal surface of the lithium-lanthanum-lead titanate and the rGO; the photo-induced electrons and the cavities arepromoted to be effectively separated by the good carrier transport property of the rGO, so that the photocatalysis property of the PbTiO3 is improved; the preparation process is simple, the synthesizing cycle is short, the cost is low, and the like.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a preparation method of lithium lanthanum lead titanate-rGO. Background technique [0002] Lead titanate (PbTiO 3 ) is a perovskite structure with a Curie temperature of about 490 °C, but weak spontaneous polarization at room temperature. How to improve its spontaneous polarization and improve the transmission and separation efficiency of photogenerated carriers is the direction that researchers have been working hard for. Therefore, many scholars have modified it to enhance its visible light responsiveness, such as forming heterojunctions, doping or depositing noble metals, and doping rare earth elements. For example, patent CN105126809A discloses a method for preparing a lead titanate / titanium dioxide two-dimensional single crystal heterojunction photocatalyst. CN104831256A discloses a method for preparing a lead titanate / titanium dioxide two-dimensional single crystal heter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14C02F1/30
CPCB01J23/14B01J35/004C02F1/30C02F2305/10
Inventor 单连伟
Owner HARBIN UNIV OF SCI & TECH