Wool keratin(WK)and silk sericin(SS)have the ability to interact with metal ions.In order to take advantage of this potential,a novel environmentally friendly waterborne polyurethane(WPU)/WK/SS membrane named as WPU&a...Wool keratin(WK)and silk sericin(SS)have the ability to interact with metal ions.In order to take advantage of this potential,a novel environmentally friendly waterborne polyurethane(WPU)/WK/SS membrane named as WPU&WK&SS membrane with crosslinked structure was constructed by freeze-drying via self-assembly style.Surface morphology and chemical structure characterization were investigated by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FT-IR).In addition,the adsorption experiments of Cu2+and Cr6+were performed to evaluate the adsorption of WPU&WK&SS membrane,including adsorption kinetics,adsorption isotherm models and various factors affecting adsorption.Further investigation indicates that the maximum adsorption capacity of Cu2+and Cr6+can reach 54.21 mg·g-1and 85.21 mg·g-1,respectively,which are higher than most of the reported adsorbents.Through adsorption kinetics and thermodynamic analysis,it is find that the pseudo-second-order kinetic equation and the Langmuir adsorption isotherm model are more suitable for the static adsorption of Cu2+and Cr6+by WPU&WK&SS membrane.展开更多
随着工业的发展,水体重金属污染逐渐成为环境污染的重要组成部分,寻求环境友好型材料来治理水体重金属污染已成为当今环境科学研究的热点之一。以羟基磷灰石和聚氨酯为原料,利用静电纺丝技术制备羟基磷灰石/聚氨酯复合纳米纤维膜(HA/PU)...随着工业的发展,水体重金属污染逐渐成为环境污染的重要组成部分,寻求环境友好型材料来治理水体重金属污染已成为当今环境科学研究的热点之一。以羟基磷灰石和聚氨酯为原料,利用静电纺丝技术制备羟基磷灰石/聚氨酯复合纳米纤维膜(HA/PU),并用其对水体中的镉污染物进行吸附研究。研究中采用了SEM、FT-IR、XRD和TGA等手段对复合纳米纤维膜的形貌、性能、结构等进行表征,并模拟进行了对含有重金属镉离子Cd^(2+)废水的吸附实验,系统考察了纳米纤维材料对Cd^(2+)吸附的影响。结果表明,在外加电压(18±2) k V、接触距离15. 0 cm、纺丝速度1. 5 m L/h的条件下,能够制得微观与宏观形貌较好的纳米纤维(膜),其中,HA/PU质量比为32/68的纤维膜对Cd^(2+)的吸附效果最佳,可短时间内达到18. 75 mg/g。展开更多
基金National Key Research and Development of China(No.2016YFC0802802)。
文摘Wool keratin(WK)and silk sericin(SS)have the ability to interact with metal ions.In order to take advantage of this potential,a novel environmentally friendly waterborne polyurethane(WPU)/WK/SS membrane named as WPU&WK&SS membrane with crosslinked structure was constructed by freeze-drying via self-assembly style.Surface morphology and chemical structure characterization were investigated by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FT-IR).In addition,the adsorption experiments of Cu2+and Cr6+were performed to evaluate the adsorption of WPU&WK&SS membrane,including adsorption kinetics,adsorption isotherm models and various factors affecting adsorption.Further investigation indicates that the maximum adsorption capacity of Cu2+and Cr6+can reach 54.21 mg·g-1and 85.21 mg·g-1,respectively,which are higher than most of the reported adsorbents.Through adsorption kinetics and thermodynamic analysis,it is find that the pseudo-second-order kinetic equation and the Langmuir adsorption isotherm model are more suitable for the static adsorption of Cu2+and Cr6+by WPU&WK&SS membrane.
文摘随着工业的发展,水体重金属污染逐渐成为环境污染的重要组成部分,寻求环境友好型材料来治理水体重金属污染已成为当今环境科学研究的热点之一。以羟基磷灰石和聚氨酯为原料,利用静电纺丝技术制备羟基磷灰石/聚氨酯复合纳米纤维膜(HA/PU),并用其对水体中的镉污染物进行吸附研究。研究中采用了SEM、FT-IR、XRD和TGA等手段对复合纳米纤维膜的形貌、性能、结构等进行表征,并模拟进行了对含有重金属镉离子Cd^(2+)废水的吸附实验,系统考察了纳米纤维材料对Cd^(2+)吸附的影响。结果表明,在外加电压(18±2) k V、接触距离15. 0 cm、纺丝速度1. 5 m L/h的条件下,能够制得微观与宏观形貌较好的纳米纤维(膜),其中,HA/PU质量比为32/68的纤维膜对Cd^(2+)的吸附效果最佳,可短时间内达到18. 75 mg/g。
