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PublicationApplied Clay Science
Year2015
Volume115
Pages115-123
International

Synthesis and characterisation of hydrotalcites produced by an aluminium hazardous waste: A comparison between the use of ammonia and the use of triethanolamine

Authors:Malcolm Yates Buxcey, , Roberto Galindo , Aurora López Delgado
Groups of research:Usos avanzados de Ecomateriales procedentes de la industria agroalimentaria
Hydrotalcite-like compounds were co-precipitated with diluted sodium hydroxide from an unconventional aluminium source: the aluminium waste generated by the tertiary aluminium industry, with the assistance of ammonia and triethanolamine at pH 10. These products were characterised by several techniques (XRD, FT-IR, UV–vis-NIR, SEM, DTA-TG and BET methods) to compare results. The characterisation of products confirmed significant differences depending on basic reagent selected. Products co-precipitated with ammonia showed less crystal growth, a more significant iron content in the structure and higher internal surface area. Products from triethanolamine showed the entry of organic molecules into the layered structure. These findings were important for the improvement of methods based on waste treatment, transforming an aluminium hazardous waste into a value added product as layered double hydroxides.
Keywords:Hydrotalcite, Layered double hydroxide (LDH), Non-conventional aluminium source, Hazardous waste
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