中国科学院海岸带环境过程与生态修复重点实验室知识库

采用两步法制备了一种环境友好型除磷基吸附剂——铁锰复合氧化物/壳聚糖珠(FMCB),对其进行了表征,并对其磷吸附行为进行了系统研究.表征结果表明,该吸附剂为多孔纤维结构,比表面积为248 m~2·g~(-1),孔容为0.37 m~3·g~(-1).吸附实验结果表明,FMCB对磷的吸附容量远高于纯的壳聚糖颗粒,且Langmuir模型能更好地拟合FMCB对磷的吸附,最大吸附量为13.3 mg·g~(-1)(pH 7.0);准二级动力学模型能更好地拟合FMCB对磷吸附的动力学实验数据;溶液pH对磷的吸附影响较大,随着pH的增大,磷的吸附量逐渐降低;共存的Ca~(2+)和Mg~(2+)对磷吸附略有促进...

Fe-Mn binary oxide impregnated chitosan bead ( FMCB) ， an environmental friendly sorbent for phosphate removal， wasfabricated through impregnating Fe-Mn binary oxide into chitosan matrix． The FMCB was characterized by SEM and BET surface areameasurement． The adsorption behavior of phosphate on the FMCB was systemically investigated． The FMCB showed a porous andfibrous structure， with a high BET specific surface area of 248 m2·g － 1 and a pore volume of 0. 37 m3·g － 1 ． It had a much higherphosphate adsorption capacity than pure chitosan bead． Langmuir model was more suitable for describing the adsorption behavior andthe maximal adsorption capacity was as high as 13. 3 mg·g － 1 at pH 7. 0 ． The kinetic data were well fitted by the pseudo second ordermodel． The phosphate adsorption on FMCB was pH-dependent and decreased with increasing solution pH． Coexisting Ca2 + and Mg2 +enhanced slightly the adsorption of phosphate， while the coexisting anions hindered the phosphate adsorption in the order of SiO2 － 3 ＞CO2 －3 ＞ SO2 － 4 ≥ Cl － ． The phosphate-loaded FMCB could be effectively regenerated using NaOH solution and repeatedly used． Incolumn tests， about 800 bed volumes of simulated groundwater containing 3 mg·L － 1 were treated before breakthrough ( phosphateconcentration in effluent reached 0. 5 mg·L － 1 ) ．