X-ray diffraction analysis
X-ray diffraction (XRD) of the silver on the biomass, dried at 30°C, was performed with a BRUKER D8 Discover. X-rays were generated by a copper X-ray tube with power 1.6 kW (40 kV, 40 mA). The wavelength CuKα corresponded to 1.54 Å. Measurements were made between 25° and 90° 2-theta with a step time of 153.6 s and a step size of 0.02° 2-theta.