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Nanotechnology is science of employment materials device and systems in nano scale that applications of Nanotechnology is reach in environmental engineering. For example water treatment by nanofilteration wastewater treatment clean energy production and nanotube for toxic gas adsorption. In this paper and research several application of this science for example fuel cell for energy production from clean sources, using from nanofilters for remove of hard water, water treatment for power plants,several application of carbon nanotube in the industry for example hydrogen storage in fuel cells for increase of yield them, toxic gas adsorption, using them insted of gas sensors.