Microwave assisted synthesis of CaO nanoparticles and use in waste water treatment


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Clean water (i.e., water that is free of toxic chemicals and pathogens) is essential to human health. Advances in nanoscale science and engineering are providing unprecedented opportunities to develop more cost effective and environmentally acceptable water purification processes. Nanomaterials have much larger surface areas than bulk materials and exhibit novel properties due to their small size. Unique properties of nanomaterials are being exploited by the researchers for developing more effective sorbents and improving for metal ions removal. In recent years, carbon nanotubes, zeolites, and different nanoparticles have been investigated for their removal of metal ions. CaO nanoparticles were obtained by the microwave irradiation technique, using Ca(NO3)2.4H2O and NaOH as starting materials. The formation monocrystalline CaO nanoparticles were confirmed by the XRD (X-Ray Diffraction) and HRTEM (High Resolution Transmission Electron Microscopy) as well as with SAED (Selected Area Electron Diffraction) analysis. The structure of the CaO nanocrystal was found to be cubic structure with particles size 24 nm and with surface area 74 m2/g. A small scale study to treat synthetic acid mine water by synthesized Ca(OH)2 nanoparticles shows higher efficiency to remove heavy metals than conventional use of lime. XRD results of precipitates show presence of different metal hydroxides and sulfate, precipitated as CaSO4.

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Journal: TechConnect Briefs
Volume: Technical Proceedings of the 2011 Clean Technology Conference and Trade Show
Published: June 13, 2011
Pages: 216 - 219
Industry sector: Energy & Sustainability
Topic: Water Technologies
ISBN: 978-1-4398-8189-7