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针对去除水体中的阴离子污染物F-离子,制备了Fe~(3+)负载的改性羊毛吸附材料(Fe~(3+)/W-g-PAO).具体步骤是首先利用传统的丙烯腈自由基聚合以及羊毛上的巯基作为链转移剂制备聚丙烯腈接枝改性的羊毛材料,进而将腈基转化为偕胺肟基团,最后利用偕胺肟基团优异的配位作用,成功负载Fe~(3+).Fe~(3+)/W-gPAO可以高效快速吸附F-,其吸附过程符合准二级动力学模型和Langmuir热力学模型.通过这种吸附方式,其对F-的饱和吸附量为14.26 mg/g.若将水溶液中的F-与Fe~(3+)先形成稳定的配位化合物,再利用改性羊毛(W-g-PAO)作为吸附剂,可以大幅度的提高其对F-的吸附量,理论值最大可达49.2 mg/g.由于W-g-PAO可以将负载在其上的Fe~(3+)还原成Fe~(2+),因此前者吸附方式的吸附量会减少.通过对其吸附机理的研究表明,F-在Fe~(3+)/W-g-PAO负载时,会形成Fe(III)[F~-]_3[—NH_2]_3的配位结构.所合成W-g-PAO材料具有价格低廉、可循环再生使用、对F-优异的吸附性能等优点.
Aiming at the removal of anionic ions F - in water, a Fe 3+ loaded wool sorbent (Fe 3+ / Wg-PAO) was prepared.The specific steps were as follows: Based polymerization and the sulfhydryl group on the wool as a chain transfer agent to prepare the polyacrylonitrile graft modified wool material to convert the nitrile group into the amidoxime group and finally utilize the excellent coordination effect of the amidoxime group for successful loading Fe 3+, Fe 3+ / W-gPAO can adsorb F- efficiently and rapidly, and its adsorption process accords with quasi-second-order kinetic model and Langmuir thermodynamic model. By this adsorption method, The saturated adsorption capacity is 14.26 mg / g.When the F - and Fe ~ (3 +) in aqueous solution form a stable coordination compound first, then the modified wool (Wg-PAO) The adsorption capacity of F- is up to 49.2 mg / g.While W 3+ can be reduced to Fe 2+ due to its adsorption on Fe 2+, The amount of Fe (III) [F ~ -] _3 [-NH_2] _3 can be reduced when the Fe ~ (3 +) / Wg-PAO The synthesized Wg-PAO material has Low cost, recyclable use, F-excellent adsorption properties and so on.