I set to prepare a magnetic composite where my starting materials were 5g biochar, 1.2065g Fe(II) and 2.4163g Fe(III). The product weighed 7.1798g after rinsing and drying.
Thanks for your response. Biochar was prepared at 600 degrees, the composite was prepared at 85 degrees and dried at 60 degrees in oven overnight..@Robert Thomas Bachmann.
thanks for getting back. Considering that you prepared the composite at 85degC is it correct to say that you prepared it in an aqueous solution containing 5 g predried(?) biochar, 1.2065 g predried(?) Fe(II) and 2.4163 g predried(?) Fe(III)?
Has the biochar been demineralised before the composite preparation? My guess not which would explain the weight loss observed.