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Preparation method of efficient three-dimensional layered dimetallic hydroxides/graphene composite photocatalyst and photocatalyst thereof

A layered bimetallic and graphene composite technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve high surface charge density, single-layer LDH Poor charge mobility, hindering photocatalytic activity and other problems, to achieve the effect of promoting separation

Active Publication Date: 2018-11-23
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, monolayer LDHs have poor charge mobility and high surface charge density, which easily lead to rapid recombination of photogenerated electron-hole pairs and agglomeration of LDH nanosheets, thus hindering its photocatalytic activity and limiting its practical application

Method used

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  • Preparation method of efficient three-dimensional layered dimetallic hydroxides/graphene composite photocatalyst and photocatalyst thereof
  • Preparation method of efficient three-dimensional layered dimetallic hydroxides/graphene composite photocatalyst and photocatalyst thereof
  • Preparation method of efficient three-dimensional layered dimetallic hydroxides/graphene composite photocatalyst and photocatalyst thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) graphite oxide is placed in a solvent for ultrasonic dispersion, and the concentration is 6.5g / L;

[0032] (2) 2mmol nickel nitrate, 0.85mmol aluminum nitrate and 0.15mmol ferric nitrate were dissolved in the solvent, and added dropwise to (1), and kept stirring for 3h;

[0033] (3) Dissolve 16 mmol of urea in the solvent, and add it into (2), and keep stirring for 1 h;

[0034] (4) reacting the above solution at 120°C for 12h;

[0035] (5) The reaction product is filtered and washed, and dried at 60° C. for 12 hours;

[0036] (6) The prepared three-dimensional NiAl 0.85 Fe 0.15 LDH / RGO 5 The composite photocatalyst degraded ciprofloxacin under visible light to measure its photocatalytic activity, and found that the degradation rate of ciprofloxacin reached 66% within 120min.

Embodiment 2

[0038] (1) Graphite oxide is placed in a solvent for ultrasonic dispersion, and the concentration is 21.7g / L;

[0039] (2) 2mmol nickel nitrate, 0.85mmol aluminum nitrate and 0.15mmol ferric nitrate were dissolved in the solvent, and added dropwise to (1), and kept stirring for 3h;

[0040] (3) Dissolve 16 mmol of urea in the solvent, and add it into (2), and keep stirring for 1 h;

[0041] (4) reacting the above solution at 120°C for 12h;

[0042] (5) The reaction product is filtered and washed, and dried at 60° C. for 12 hours;

[0043] (6) The prepared three-dimensional NiAl 0.85 Fe 0.15 LDH / RGO 15 The composite photocatalyst degraded ciprofloxacin under visible light to measure its photocatalytic activity, and found that the degradation rate of ciprofloxacin reached 84% within 120min.

Embodiment 3

[0045] (1) Graphite oxide is placed in a solvent for ultrasonic dispersion, and the concentration is 40.9g / L; the solvent can be water, ethanol, ethylene glycol or glycerol;

[0046] (2) 2mmol nickel nitrate, 0.85mmol aluminum nitrate and 0.15mmol ferric nitrate were dissolved in the solvent, and added dropwise to (1), and kept stirring for 3h;

[0047] (3) Dissolve 16 mmol urea in the solvent, and add it into (2), and keep stirring for 1 h;

[0048] (4) reacting the above solution at 120°C for 12h;

[0049] (5) The reaction product is filtered and washed, and dried at 60° C. for 12 hours;

[0050] (6) The prepared three-dimensional NiAl 0.85 Fe 0.15 LDH / RGO 25 The composite photocatalyst degraded ciprofloxacin under visible light to measure its photocatalytic activity, and found that the degradation rate of ciprofloxacin reached over 93% within 120min.

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Abstract

The invention discloses a preparation method of an efficient three-dimensional layered dimetallic hydroxides / graphene composite photocatalyst and a photocatalyst thereof. The preparation method comprises the following steps: uniformly dispersing graphite oxide in a solvent; dropwise adding the mixed salt solution of nickel, aluminum and iron, and stirring; adding urea and stirring for reacting. According to the preparation method disclosed by the invention, graphene is adopted as a carrier of LDH nanosheet, and a layered dimetallic hydroxides / graphene composite photocatalyst with a three-dimensional structure is formed. Through loading of graphene, agglomeration of LDH nanosheets is inhibited, and separation of photo-induced electron-hole pairs in LDH is promoted so that the photocatalystis better applied to the photocatalytic degradation of antibiotics. The three-dimensional NiAl0.85Fe0.15LDH / RG025 composite photocatalyst prepared by the invention degrades ciprofloxacin under visiblelight so as to test the photocatalytic activity, and the result shows that the degradation rate of ciprofloxacin within 120 minutes reaches 93% or more.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation, and in particular relates to a preparation method of an efficient three-dimensional layered double metal hydroxide / graphene composite photocatalyst and the photocatalyst. Background technique [0002] In order to effectively remove chemical pollutants (such as antibiotic residues) in water, semiconductor-mediated photocatalytic technology has attracted extensive attention of researchers due to its low energy consumption and environmental protection. So far, through the efforts of researchers, various photocatalysts for water pollution remediation have been developed, such as metal oxides, metal sulfides, layered double metal hydroxides, etc. Among these photocatalysts, layered double hydroxides (LDHs) are considered as promising photocatalytic materials due to their unique layered structure, tunable metal composition and intercalated anions. [0003] However, monolayer...

Claims

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Application Information

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IPC IPC(8): B01J23/755C02F1/30C02F101/36
CPCC02F1/30B01J23/755C02F2305/10C02F2101/36B01J35/39
Inventor 何光裕陈海群梁键星陈群朱俊武汪信
Owner CHANGZHOU UNIV
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