Abstract
A novel low temperature method for synthesis of nano-crystalline magnesium chromites from the tannery waste solution was investigated. Magnesium and chromium hydroxides gel was co-precipitated at pH 8.5 using ammonia solution. MgCr2O4 was obtained by heating the gel formed at different temperatures 300–500°C for to 8h. FT-IR, TG-DTG-DTA, FE-SEM and TEM were used to investigate the produced materials. XRD patterns of the primary oxides revealed the formation of amorphous oxide phase by heating at 300°C. Heating at 400°C produces nano-crystallite magnesium chromites partly having the structure MgCrO4 and mainly MgCr2O4 and traces of Cr2O3+ 500°C MgCrO4 mostly decomposed into MgCr2O4 structure. After 8h of heating at 500°C, Cr2O3 completely disappeared. A high surface area about 42.6m2/g and mesoporous structure was obtained for the produced sample at 500°C for 8h. A thermodynamic model has been suggested to explain the findings.
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