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Fig. 7. TEM analysis of the photocatalysts: (A) TiO2 NPs/BMI·BF4 IL, (B) 1% Cu2+-doped TiO2 NPs/BMI·BF4 IL, (C) 1% Fe3+-doped TiO2 NPs/BMI·BF4 IL, (D) histogram of diameter distribution TiO2 NPs/BMI·BF4 IL, (E) histogram of diameter distribution 1% Cu2+-doped TiO2 NPs/BMI·BF4 IL, (F) histogram of diameter distribution 1% Fe3+-doped TiO2 NPs/BMI·BF4 IL.