ABSTRACT

Cr(VI)-imprinting thiosemicarbazide–functionalized sodium alginate (IIPTSC@SA) microspheres were fabricated to achieve the good selective adsorption for Cr(VI) removal from aqueous solution containing multiple ions. The selective adsorption and reusability of IIPTSC@SA microsphere were intensively investigated. The results showed that the grafting conditions of thiosemicarbazide were optimized at 0.2 g of TSC at 60 °C for 5 h and the ion-imprinting conditions at 100 mL of 2 wt % glutaraldehyde at 60 °C for 6 h. IIPTSC@SA microspheres exhibited the maximum adsorption capacity of 252.5 mg/g and good selectivity to remove Cr(VI) from multi-ion coexisting water. The adsorption process complied with a monolayer adsorption by virtue of chemical interactions together with endothermic spontaneously. After eight adsorption–desorption, the adsorption capacity and selectivity of IIPTSC@SA microspheres remained relatively stable.

摘要

制备了 Cr(VI) 印迹氨基氨基硫脲功能化海藻酸钠 (IIPTSC@SA) 微球，以实现从含有多种离子的水溶液中去除 Cr(VI) 的良好选择性吸附。深入研究了IIPTSC@SA微球的选择性吸附和可重复使用性。结果表明，氨基硫脲的接枝条件优化为 0.2 g TSC 60 ℃ 5 h 和离子印迹条件 100 mL 2 wt% 戊二醛 60 ℃ 6 h。IIPTSC@SA微球的最大吸附量为252.5 mg/g，对多离子共存水中Cr(VI)的去除具有良好的选择性。吸附过程通过化学相互作用和自发吸热符合单层吸附。经过八次吸附-解吸，