Green purification of different natural water samples in Fayoum governorate by using a novel and safe modified rice husk.

A study on the modification of rice husk by sodium carbonate showed that sodium carbonate modified rice husk (NaCMRH) has a high capacity for extraction of some metal ions like Cd(II), Cu(II), Pb(II) and Zn(II). For this task, several techniques such as spectroscopy and thermogravimetry were used for the elucidation of the possible functional groups responsible for the extraction of the studied metal ions; the morphological characteristics of this material were evaluated as well. Batch adsorption studies were conducted for all the studied metal ions in the concentration range 10–100 mg/L. The adsorption was favoured with maximum adsorption at pH 6, whereas the adsorption starts at pH 4 for all metal ions. The effects of contact time, initial concentration of metal ions and adsorbent dosage have been reported. Natural water samples were obtained from different locations over Fayoum governorate, Egypt. The high efficient, low cost and rapid uptake of metals (Al3+ , Cd+2, Co+2, Cr+3, Cu+2, Fe+2, Mn+2, Ni+2,Pb+2, Ti+3, V+5, Zn+2) in different matrices indicated that the new modified sorbent, NaCMRH, could be an excellent alternative for the extraction and purification of some natural waters.