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Table 1 Chemical composition of the used clays (Yahaya et al. 2017; Hassan and Abdel-Khalek 1998; Boulos et al. 2015)

From: Adsorption performance of coated bentonite via graphene oxide

ClayTotal SiO2%Free quartz (%)Combined SiO2%Al2O3%H2O%MnO%MgO%Other minerals (%)
Kaolinite29.1821.13641.2
Bentonite5417.01140.082.4712.44
Feldspar73.512.514