Method for preparing biological expanded graphite with visible light catalytic activity
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A technology of expanded graphite and catalytic activity, applied in the field of water treatment, can solve the problems of low efficiency and long time required, and achieve the effects of large expansion volume, improved degradation performance, and enhanced in-situ repair ability.
Inactive Publication Date: 2012-07-04
TONGJI UNIV
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Problems solved by technology
However, the microbial degradation of petroleum pollutants is a complex process. Due to the constraints of many factors such as petroleum components and physical and chemical properties, environmental conditions, and microbial community composition, there are still disadvantages such as low efficiency and long time required. , the joint use of bioremediation technology and other repair technologies needs to be strengthened
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Embodiment 1
[0017] (1) N-TiO 2 Preparation of expanded graphite
[0018] Mix 1.5mL of hydrogen peroxide (30%), 15mL of butyl titanate and 50mL of absolute ethanol, stir well to prepare an oxidation intercalation solution, add 5g of natural flake graphite (50 mesh) and react in a water bath at 50°C 20min. After the reaction is completed, filter, add graphite to a mixed solution of 25mL ammonia water and 25mL absolute ethanol for hydrolysis and nitrogen doping, stir for 30min, wash with water until the pH of the cleaning solution is 6.8, dry it in an oven at 105°C, and take it out at 800°C Preparation of N-TiO by Reaction in Muffle Furnace for 30s 2 Expanded graphite, ready for use.
[0019] (2) Preparation of mixed bacterial solution of petroleum-degrading bacteria
[0027] (1) N-TiO 2 Preparation of expanded graphite
[0028] Mix 1mL of hydrogen peroxide (30%), 20mL of butyl titanate and 60mL of absolute ethanol to prepare an oxidation intercalation solution, add 5g of natural flake graphite (50 mesh) and stir evenly, and react in a water bath at 80°C for 30min. After the reaction, filter, add graphite to the mixed solution of 30mL ammonia water and 30mL absolute ethanol for hydrolysis and nitrogen doping, stir for 30min, wash with water until the pH of the cleaning solution is 7.4, place it in an oven at 105°C for 18h, take it out and heat it at 1000°C N-TiO was prepared by reacting in Furnace for 20s 2 Expanded graphite, ready for use.
[0029] (2) Preparation of mixed strains of petroleum-degrading bacteria
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Abstract
The invention relates to a method for preparing biological expanded graphite with visible light catalytic activity. Natural flake graphite is taken as a raw material, and the method comprises the following steps of: allowing tetrabutyl orthotitanate to enter gaps of a graphite layer by using an oxidation-intercalation method, hydrolyzing the intercalated graphite in an alcoholic solution of ammonia water to fulfill the aim of doping nitrogen by using a sol-gel method, drying and expanding at high temperature to obtain N-TiO2 expanded graphite, and culturing and breeding mixed bacteria by taking the N-TiO2 expanded graphite as a carrier under the conditions of aerobic and constant temperature culture to obtain the biological expanded graphite with the visible light catalytic activity. The biological expanded graphite with the visible light catalytic activity has the characteristics of high hydrophobicity, high visible light catalytic activity, proper porosity, high adsorptivity, high biodegradation property and the like. During use, the biological expanded graphite with the visible light catalytic activity can be directly applied to the surface of petroleum contaminated water, the biological expanded graphite can be floated on an oil-water interface for a long term to efficiently remove floating oil on the water surface, and the biological expanded graphite is convenient to recycle and avoids secondary pollution.
Description
technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of biologically expanded petroleum with visible light catalytic activity. Background technique [0002] The unbalanced distribution of the world's oil resources has spawned and prospered the current oil shipping industry, but the frequent occurrence of ship oil spills has made the marine environment face unprecedented severe challenges. Sudden oil spills have the characteristics of complex nature, sudden occurrence, serious hazards, and difficulties in handling and disposal, which not only seriously damage the natural ecological environment of the ocean and coast, but also cause huge economic losses to the local fishery, aquaculture, and tourism industries. The prevention and control of marine oil spill pollution has reached the point of no delay. [0003] At present, marine oil spill treatment technologies include physical treatment, che...
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