表面改性秸秆生物质环境材料对水中PAHs的吸附性能

300~700℃下热解炭化芝麻秸秆8h后,再用H3PO4溶液进行表面改性,制备了芝麻秸秆生物质环境材料.测定了生物质环境材料比表面积及其对亚甲基蓝和碘的吸附能力,并以多环芳烃(PAHs)为目标污染物,探讨了生物质环境材料对水中不同固液比(0.01g/32ml和0.02g/32mL)下单一PAHs菲以及复合PAHs萘、苊、菲的吸附性能.结果表明,随热解温度升高,秸秆生物质环境材料比表面积增大,对碘和亚甲基蓝的吸附能力也增强,700°C时比表面积、碘值和亚甲基蓝吸附值的最大值分别为269.95m2/g、434mg/g和150mg/g.生物质环境材料吸附水中PAHs的能力强,700℃时0.01g材料对32mL水中萘、苊、菲的去除率分别高达94.44%、95.47%和100%,均比相同条件下未经H3PO4改性的秸秆生物质环境材料高.

Removal of PAHs from aqueous solution by the surface modified-stalk environmental biomaterials

The sesame stalks were pyrolyzed and charred for 8h in the range of 300~700℃, and then surface modified by H3PO4, the stalk environmental biomaterials was prepared. 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 (PAHs) and mixing PAHs naphthalene, acenaphthene, and phenanthrene were investigated at different solid-liquid ratios, respectively. 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 maximum values observed at 700°C were 269.95m2/g and 434, 150mg/g, respectively. The obtained stalk biomaterials could effectively remove the PAHs from water. For instance, 94.44%, 95.47%, and100% of naphthalene, acenaphthene, and phenanthrene in 32 mL water were removed by 0.01g biomaterials obtained by sesame stalk at 700℃. And these stalk environmental biomaterials higher than those without H3PO4-modified under the same conditions. 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.