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Preparation method of graphene photo-thermal transformation material for sea water desalination and clean water treatment

A light-to-heat conversion and water purification treatment technology, which is applied in seawater treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as equipment corrosion, low energy utilization rate, and low evaporation efficiency, and achieve repeatable Use cleaning, simple structure, easy to use effect

Active Publication Date: 2017-06-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0003] At present, the solar desalination technology used is mainly divided into two categories: one is to use solar energy for photovoltaic power generation, and then use electric energy to drive the reverse osmosis device for desalination, because the conversion efficiency of photovoltaic power generation itself is very low, and the reverse osmosis device itself Energy consumption and life issues limit its development
The second is to use the thermal effect of solar energy to heat seawater through heat collectors to make it distill and desalinate; due to the low energy utilization rate, its working temperature is usually very low, and the evaporation efficiency is not high; and to improve efficiency, it is necessary to build large-scale heat collectors to Heating seawater will undoubtedly increase the use and maintenance costs of this technology; equipment corrosion and pipeline blockage caused by high salinity in seawater have also become technical obstacles that are difficult to overcome in the promotion and use of large-scale equipment

Method used

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  • Preparation method of graphene photo-thermal transformation material for sea water desalination and clean water treatment
  • Preparation method of graphene photo-thermal transformation material for sea water desalination and clean water treatment

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preparation example Construction

[0028] The preparation methods of intrinsic graphene or graphene derivatives include but are not limited to the following three methods: namely, graphene powder or liquid phase dispersion prepared by expansion and exfoliation of graphite as raw material, gaseous carbon source as raw material through chemical Graphene powder or liquid phase dispersion formed by pulverizing or dispersing graphene prepared by vapor deposition (CVD) or physical vapor deposition (PVD), or graphene-like two-dimensional sheet material formed by chemical polymerization of small molecular substances Agglomerated powder or liquid dispersion.

[0029] Polymers with a chain molecular structure include but are not limited to the following substances: sucrose, cellulose and its derivatives, thermoplastic and thermosetting resin materials (such as: polyvinyl alcohol, polyethylene, polypropylene, epoxy resin, phenolic resin, Aldehyde and ketone resin, etc.); the solvent used is selected from a corresponding g...

Embodiment 1

[0033] After 50g graphene powder and 15g polyvinyl alcohol and 1kg water are mixed, utilize high-speed shear emulsification to make it uniform slurry, carry out high-speed centrifugation to above-mentioned slurry, collect lower floor slurry, its solid content (weight ratio) is 8.7%; the above slurry poured into the bottom area is 225cm 2 (15cm×15cm) in a square stainless steel mold to make it flat to form a cake with a thickness of about 2cm; put the cake together with the mold at room temperature for 12 hours and then put it into a blast drying oven and heat it to 80°C for drying for 4 Take it out after one hour, put it into a muffle furnace and heat it to 550° C. for 5 hours to completely carbonize the polyvinyl alcohol in the material. After cooling to room temperature, the black foamy material in the mold is taken out to obtain a graphene foam material with good mechanical strength. Prepare polyvinyl alcohol into a uniform aqueous solution with a concentration of 5wt%, an...

Embodiment 2

[0036] After 20g graphene powder and 10g hydroxyethyl cellulose and 800g ethanol are mixed, utilize high-speed shear emulsification to make it uniform slurry, above-mentioned slurry is carried out high-speed centrifugation, collect lower floor slurry, its solid content (weight ratio ) was 6.6%; the above-mentioned slurry was poured into a circular stainless steel mold with a diameter of 35cm and paved to form a cake with a thickness of about 2.2cm; the cake and the mold were left to stand at room temperature for 12 hours and then put into Take it out after heating to 80°C for 4 hours in a blast drying oven, and heat it to 850°C in a muffle furnace for 5 hours to completely carbonize the hydroxyethyl cellulose in the material. After cooling to room temperature, the black foamy material in the mold is taken out to obtain a graphene foam material with good mechanical strength. Treating the bottom surface (the side soaked in water) with oxygen plasma for 10 minutes can make the su...

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Abstract

The invention relates to the field of water treatment materials, in particular to a preparation method of a graphene photo-thermal transformation material for sea water desalination and clean water treatment. The preparation method comprises the steps of preparing graphene powder, a polymer material with a chain molecule structure and a solvent into a sizing agent according to the proportion, adding into a mold for drying and heat treating so as to enable organic substances in the material to be carbonized, and obtaining a graphene foam material with favorable mechanism strength; carrying out hydrophilization treatment on one side of the bottom face of the graphene foam material, and obtaining the graphene photo-thermal transformation material for sewage and sea water distillation purification and desalination. According to the material, a black body structure and a high thermal conductivity property of graphene foams are utilized, so that sunlight can be high-efficiently transformed into heat; a capillary action of the foam structure is utilized for continuously conveying water and reducing an evaporation barrier, so that sea water is quickly distilled and desalted. A graphene foam material is utilized for manufacturing the portable high-efficient sea water desalination and sewage purification device, which meets the demand on quickly preparing clean freshwater on sea and outdoors.

Description

technical field [0001] The invention relates to the field of water treatment materials, in particular to a preparation method of a graphene photothermal conversion material used for seawater desalination and water purification treatment. Background technique [0002] Fresh water is one of the basic materials for the survival and development of human society. my country's per capita water resources are scarce, ranking 108th in the world. my country has a long coastline, and some islands, coastal saline-alkaline areas, and inland brackish water areas are areas that lack fresh water. People in these areas have various diseases due to long-term drinking of water that does not meet the hygienic standards, which directly affects their health and local economic construction. Therefore, solving the shortage of fresh water supply is a serious problem facing our country. In order to increase the supply of fresh water, an advantageous way is to desalinate seawater or brackish water ...

Claims

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Application Information

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IPC IPC(8): C02F1/14C02F103/08
CPCY02A20/124Y02A20/142Y02A20/212Y02W10/37
Inventor 裴嵩峰黄坤任文才成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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