The X-ray diffractograms of SH, CSH, WSH30 and WSH40 were obtained at room temperature within a 2θ range from 5 to 40° and a scan rate of 1° min−1. The equipment used was a diffractometer Shimadzu LabX XRD-6000, operating at a power of 40 kV with a current of 30 mA and Cu Kα radiation (1.5406 Å). Before performing the XRD, all samples were dried at 50 °C for 12 h in an air-circulating oven. The crystallinity index (CrI) of the material was determined by the Segal method ( Segal, 1959) as shown in Eq