Graphene oxide and graphite-phase carbon nitride composite modified membrane material and preparation method thereof

A modification and membrane flux technology, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc., can solve the problems of low visible light catalytic efficiency, high photogenerated charge recombination rate, insufficient photocatalyst activity, etc. , to achieve the effects of low cost, improved anti-pollution performance, visible light catalytic ability and enhanced hydrophilic performance

Active Publication Date: 2019-03-08
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in the composite photocatalytic separation membrane, such as insufficient photocatalyst activity, high photogenerated charge recombination rate, resulting in low visible light catalytic efficiency; narrow spectral response range, resulting in only absorption of ultraviolet light, which accounts for 43% of solar spectrum energy. Visible light, etc., have led to the high cost of photocatalytic technology application, and it is difficult to take into account the decrease of membrane flux while improving the light absorption performance; and the high cost of UV radiation makes it difficult to apply to actual industrial production, which limits this. The development and application of the technology

Method used

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  • Graphene oxide and graphite-phase carbon nitride composite modified membrane material and preparation method thereof
  • Graphene oxide and graphite-phase carbon nitride composite modified membrane material and preparation method thereof
  • Graphene oxide and graphite-phase carbon nitride composite modified membrane material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0068] Embodiment 1 graphene oxide (GO) and graphite phase carbon nitride (g-C 3 N 4 ) Preparation of blended dispersion

[0069] GO and g-C 3 N 4 The preparation process of blended dispersion liquid is as follows: figure 1 As shown, g-C was first prepared by high temperature calcination 3 N 4 . Take 1g of prepared g-C 3 N 4 Add 200mL of pure water, ultrasonic 20min (power 300W). to g-C 3 N 4 Become a uniform dispersion, and dilute to 1L as a stock solution. Then take a certain amount of 100mg·L -1 GO dispersion and g-C 3 N 4 Mix the dispersion, add pure water to 200mL, and ultrasonically disperse for 20min to prepare GO and g-C 3 N 4 mixed dispersion.

Embodiment 2

[0070] Example 2 GO / g-C 3 N 4 Preparation of modified membrane

[0071] 1. Preparation method

[0072] GO / g-C 3 N 4 The preparation process of the modified membrane is as follows: figure 2 shown. First, immerse the original PVDF membrane in absolute ethanol solution for 30 minutes. After the original membrane is fully wetted, then immerse it in pure water for 30 minutes to restore the flux of the original membrane. In GO / g-C 3 N 4 Add 5g of surfactant SDBS to the blend solution and set the volume to 1L, put the original membrane into the ultrafiltration cup, under the action of ultrafiltration pressure (0.15Mpa), make the original membrane to GO / g-C 3 N 4 / SDBS blend was subjected to ultrafiltration adsorption. After the ultrafiltration adsorption is completed, the membrane is soaked in the hydrochloric acid (PH=1) solution of aniline (An). Immediately after soaking, soak it in the hydrochloric acid solution (PH=1) of ammonium persulfate (APS) to make it undergo in...

Embodiment 3

[0087] Example 3 GO / g-C 3 N 4 Preparation of modified membrane

[0088] 1. Preparation method

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Abstract

The invention discloses a GO (graphene oxide) and g-C3N4 composite modified membrane material. A preparation method includes steps: activating an original membrane to recover original membrane flux; adding a surfactant into GO and g-C3N4 mixed dispersion liquid to obtain mixed liquid; soaking the activated original membrane into the mixed liquid to realize ultrafiltration adsorption, and soaking the membrane into aniline hydrochloric acid solution; taking out after soaking is finished, and soaking in hydrochloric acid solution of ammonium persulfate immediately to enable interface polymerization reaction; finally, drying the membrane to obtain the composite modified membrane material. By an ultrafiltration adsorption and interface polymerization combined modification method, GO and g-C3N4are combined for surface composite modification of the membrane material, and a visible light responsive catalytic modified membrane is developed. The novel modified membrane is low in preparation cost and recyclable, pollution resistance is remarkably improved, firmness in modifying agent and photocatalyst loading is achieved, the visible catalytic performance and hydrophilic performance are remarkably enhanced, the forbidden bandwidth of a membrane function layer is decreased, the problem of secondary pollution is avoided, and a promising application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment and environmental functional materials, and more specifically, relates to a PVDF membrane compounded and modified with graphene oxide and graphite phase carbon nitride and a preparation method thereof. Background technique [0002] There is a shortage of fresh water resources in my country, and more than half of the more than 600 cities have water shortages to varying degrees, especially in coastal cities. With the development of industry, water pollution is still an urgent problem to be solved, and with the construction of the country's "resource-saving and environment-friendly society", the continuous improvement of people's living standards and the improvement of water treatment in various industries The requirements for technology and water quality are getting higher and higher. For the first time, the national development plan clearly puts forward the core goal of "overall improvemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D69/12B01D71/02B01D71/34B01J27/24B01J35/00C02F1/30C02F1/44
CPCB01D61/145B01D67/0079B01D69/02B01D69/12B01D71/021B01D71/34B01D2325/36B01J27/24B01J35/004C02F1/30C02F1/444C02F2305/10
Inventor 李冬梅文豪程志华李淑贞黄明珠杜青平蒋树贤
Owner GUANGDONG UNIV OF TECH
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