Recovery of gold as a type of porous fiber by using biosorption followed by incineration

► A fiber form of bacterial biosorbent modified with polyethylenimine was developed. ► The maximum uptake of Au(I) by the developed biosorbent fibers was 421.1 mg/g at pH 5.5. ► By incinerating the Au-loaded biosorbent fibers, the perforated gold tube with 60 μm of diameter was obtained.