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Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt

A catalytic material, graphene technology, applied in the field of photocatalytic materials, can solve the problems of limiting the application of bismuth molybdate, unfavorable large-scale production, low photocatalytic efficiency, etc., and achieves good electron transport performance, low processing temperature, and photocatalysis. Highly active effect

Active Publication Date: 2015-05-06
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the photon quantum yield of bismuth molybdate materials is low, and the generated photogenerated electron-hole pairs are easy to recombine, showing low photocatalytic efficiency.
In addition, most of the current methods for preparing bismuth molybdate have harsh reaction conditions, complex processes, and high costs, which are not conducive to large-scale production, which greatly limits the application of bismuth molybdate

Method used

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  • Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt
  • Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt
  • Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt

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Experimental program
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Effect test

Embodiment 1

[0032](1) Add 4 mL of graphene oxide solution with a concentration of 0.9 g / L into 50 mL of deionized water and ultrasonically disperse for 30 min to obtain a graphene dispersion;

[0033] (2) Add 0.8 g sodium polyacrylate to the graphene dispersion, stir and ultrasonically disperse at 25°C for 20 min to obtain a uniformly dispersed solution;

[0034] (3) Add 0.6 g of sodium molybdate to the uniformly dispersed solution, and continue ultrasonic dispersion at 10°C for 20 min to obtain a uniformly dispersed solution;

[0035] (4) Slowly drop 10 mL of bismuth nitrate solution with a concentration of 0.103 mol / L into the uniformly dispersed solution, and ultrasonically stir for 20 min to obtain a uniformly dispersed colloidal liquid;

[0036] (5) Add 0.1 g of gelatin to the uniformly dispersed colloidal liquid, stir ultrasonically for 30 min, and place it at 50°C for 5 h to obtain a uniformly dispersed viscous liquid;

[0037] (6) Add 20 mL of ammonia solution with a concentratio...

Embodiment 2

[0042] (1) Add 13 mL of reduced graphene oxide solution with a concentration of 1.2 g / L into 50 mL of deionized water and ultrasonically disperse for 40 min to obtain a graphene dispersion;

[0043] (2) Add 1.8 g of sodium alginate to the graphene dispersion, stir and ultrasonically disperse at 35 °C for 30 min to obtain a uniformly dispersed solution;

[0044] (3) Add 1.8 g of ammonium molybdate to the uniformly dispersed solution, and continue to ultrasonically disperse for 30 min at 35 °C to obtain a uniformly dispersed solution;

[0045] (4) Slowly drop 16 mL of bismuth nitrate solution with a concentration of 0.13 mol / L into the uniformly dispersed solution, and ultrasonically stir for 30 min to obtain a uniformly dispersed colloidal liquid;

[0046] (5) Add 1.6 g of gelatin to the uniformly dispersed colloidal liquid, stir ultrasonically for 30 min, and place it at 50°C for 7 h to obtain a uniformly dispersed viscous liquid;

[0047] (6) Add 20 mL of NaOH solution with ...

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Abstract

The invention relates to a preparation method of a visible light catalysis material for a graphene / bismuth molybdate nanobelt. According to the preparation method, with bismuth nitrate, molybdate and graphene as raw materials, the product, i.e. the visible light catalysis material is obtained by the steps of organic electrolyte assisted precipitation, ultraviolet irradiation, ageing, washing, drying and the like. The preparation method has the greatest characteristics that the graphene / bismuth molybdate nanobelt composite material is obtained by using an organic electrolyte assisted coprecipitation method and ultraviolet irradiation; the preparation process is simple, low in energy consumption and easy for realizing large-scale production; meanwhile, the nanobelt structure shows a favourable electronic transport performance and is more beneficial to separation of photoelectrons and hole pairs compared with nanoparticles; the visible light catalysis material for the graphene / bismuth molybdate nanobelt has strong adsorption and high catalysis activity and can be applied to the fields of sewage treatment, light degradation of water, air purification and solar batteries.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and relates to a preparation method of a graphene / bismuth molybdate nanobelt visible light catalytic material. Background technique [0002] Bi bismuth molybdate with Aurivillius layered features 2 o 3 – MoO 3 Binary compounds, with excellent chemical properties, unique ferroelectric properties, catalytic properties, and nonlinear dielectric susceptibility, are good visible light catalyst materials. The valence band of bismuth molybdate is composed of Bi6s and O2p hybrid orbitals, while the conduction band is composed of Mo4d orbitals, which makes the forbidden band width narrow (about 2.8 eV), and has good light absorption performance for wavelengths below 442 nm . In addition, the hybridization of Bi6s and O2p orbitals makes the valence band more dispersed, which is conducive to the movement of photogenerated holes on the valence band, hinders their recombination with photogenerated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28
Inventor 陈传盛曹时义刘天贵谢小缔陈为为
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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