[Preparation method of stalk environmental biomaterial and its sorption ability for polycyclic aromatic hydrocarbons...

The soybean, sesame and corn stalks were pyrolyzed and charred for 8 h at 300-700 degrees C to obtain stalk environmental biomaterials. The BET specific surface areas, methylene blue, and iodine adsorption capacity of the stalk environmental biomaterials were determined. The sorption efficiency of these materials on single polycyclic aromatic hydrocarbon (PAH) and mixing PAHs were investigated. The BET specific surface areas of stalk biomaterials enlarged, and the sorption ability on methylene blue and iodine enhanced with increasing the treatment temperature. The obtained stalk biomaterials could effectively remove the PAHs from water. For instance, 91.28%, 89.01% and 99.66% of naphthalene, acenaphthene, and phenanthrene in 32 mL water were removed by 0.01 g biomaterials obtained by soybean stalk at 700 degrees C. The removal efficiencies of biomaterials for mixed PAHs in water were in the order of phenanthrene > naphthalene > acenaphthene. However, the sorption ability of produced stalk biomaterials differed significantly, and followed the order of corn > soybeans > sesame for the removal of naphthalene and acenaphthene, and soybean > corn > sesame for phenanthrene removal in water. Results of this work would provide some insight into the reuse of crop stalks, and also open a new view on the treatment of organic polluted water utilizing biomaterials.