Preparation: |
synthesized by chemical precipitation [27, 28]: 0.1 mol/L NaOH solution (Fisher Scientific,
analytical reagent) was slowly added dropwise
(~3 mL/min) into 0.5 mol/L Fe(NO3)3 solution under vigorous stirring conditions (125 rpm), then the suspension was stirred under room temperature for 5 days. The nano goethite was obtained by centrifuging it at 1,6109g for 30 min before
washing it with 0.01 mol/L HCl solution several times |