functional groups and surface properties were characterized using XRD, FTIR and BET respectively. The XRD data of the adsorbents were collected with a D/MAX 2200 diffractometer using Cu Kα radiation (Rigaku, Japan). The FTIR spectra were recorded with a Nicolet 400D spectrophotometer (Thermo, United States). Surface area measurements were performed on ASAP 2020 surface area and porosity analyzer (Micromeritics, United States).