【摘要】 为探讨农业固体废弃物的有效资源化,以香蕉皮为原料,分别制备改性香蕉皮粉末(modified banana peel powder,MBP)和香蕉皮活性炭(banana peel activated carbon,BAC)用以吸附水中的甲氰菊酯。通过静态吸附实验对比两种材料对水中甲氰菊酯的吸附效果。扫描电镜、BET法测定比表面积及孔径分析表征结果表明,BAC比MBP有更大的比表面和更发达的孔道结构;傅里叶变换红外光谱表征结果显示,MBP比BAC具有更多的表面官能团结构。静态吸附实验结果显示:在pH为4～9范围内,MBP对甲氰菊酯的吸附容量和吸附速率均低于BAC。两种材料吸咐甲氰菊酯的最佳pH为7,在此条件下,MBP和BAC的饱和吸附量分别为58.215μg/g和91.005μg/g;等温拟合结果显示:两种材料吸附水中甲氰菊酯的吸附均倾向于Langmuir等温模型,说明其吸附倾向于化学吸附; Freundlich等温拟合结果显示:香蕉皮活性炭具有更低的1/n值,说明其吸附甲氰菊酯更容易发生;吸附动力学模型拟合结果显示:改性香蕉皮粉末及活性炭对甲氰菊酯的吸附更倾向于准二阶动力学模型。研究结果表明,BAC吸附水中甲氰菊酯的效果优于MBP,同时,MBP作为一种低成本生物吸附材料,对水中的甲氰菊酯也具备一定的吸附能力,且属于容易发生的吸附。更多还原

【Abstract】 In order to investigate the recycling of agricultural solid wastes,modified banana peel powder(MBP)and banana peel activated carbon(BAC)were used to adsorb fenpropathrin in water.Their adsorbing performance was compared through static adsorption experiment.It is showed that BAC is superior to MBP for surface speciation and pore structure by scanning electron microscope analysis,surface area analyzer and pore analysis(BET).The Fourier-transform infrared spectroscopy shows that MBP contains more functional groups than BAC.The results of static adsorption experiment show that the adsorption capacity and rate of MBP is inferior to BAC when pH range is 6～9,and both of optimal adsorption pH of these two materials are 7.The saturation adsorption capacity under experiment conditions of MBP and BAC are 58.215μg/g and 91.005μg/g,respectively.The results of isothermal fitting show that the adsorption mechanism of two material tend to chemical procedure,and BAC has lower value of 1/n,which indicates that BAC is easier to adsorb fenpropathrin than MBP.The adsorption kinetic studies show that both the fenpropathrin adsorption of MBP and BAC are more inclined to the pseudo-second-order model.This study indicates that BAC is superior to MBP for adsorption fenpropathrin.Meanwhile,MBP is easy to adsorb fenpropathrin in water as a kind of inexpensive bio-material.更多还原