Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan 430030, China.
Department of Pharmacy, Union Hospital of Huazhong University of Science and Technology, Wuhan 430022, China.
J Hazard Mater. 2019 Mar 15;366:529-537. doi: 10.1016/j.jhazmat.2018.12.033. Epub 2018 Dec 11.
With the extensive applications of gold nanoparticles (AuNPs) and the confirmation of their toxicity on human health and environment, it was urgent to remove AuNPs from environment. The hierarchically porous poly(ethylenimine) modified poly(styrene-co-divinylbenzene) microsphere (PEI-PS-DVB) was prepared and characterized by scanning electron microscopy, X-ray diffraction, transform infrared spectrometry, energy dispersive X-ray spectrometry, elemental analysis, contact angle, zeta potential analysis, N adsorption-desorption and mercury intrusion porosimetry. PEI-PS-DVB possessed abundant flow-through pores (70-120 nm) and meso/micropores (<50 nm); the former pores enabled full availability of the adsorbent to relatively large adsorbate, i.e. AuNPs, with fast mass transfer, while the latter ones ensured large surface area for high adsorption capacity. Thanks to its plentiful nitrogen and special hierarchical pores, PEI-PS-DVB was suitable for the adsorption of AuNPs by electrostatic interaction and special affinity between nitrogen and Au. The adsorption obeyed the pseudo-first-order kinetic and Langmuir isotherm models. The maximum adsorption capacity based on Langmuir model was 806.5 mg/g. Moreover, PEI-PS-DVB adsorbing AuNPs could be the efficient catalyst for the reduction of 4-nitrophenol with satisfactory reusability. The developed hierarchically porous PEI-PS-DVB was a promising adsorbent for AuNPs with high adsorption capacity, and recycling usage of waste AuNPs conformed to the green and sustainable concept.
随着金纳米粒子（AuNPs）的广泛应用和对其人类健康和环境毒性的确认，迫切需要将 AuNPs 从环境中去除。通过扫描电子显微镜、X 射线衍射、变换红外光谱、能量色散 X 射线光谱、元素分析、接触角、Zeta 电位分析、N 吸附-解吸和压汞孔隙率分析，制备并表征了具有分级多孔结构的聚（乙二胺）改性聚苯乙烯-二乙烯基苯微球（PEI-PS-DVB）。PEI-PS-DVB 具有丰富的贯穿孔（70-120nm）和中孔/微孔（<50nm）；前者的孔使吸附剂能充分利用相对较大的吸附剂（即 AuNPs），实现快速传质，而后者则确保了较大的表面积，从而具有较高的吸附能力。由于其丰富的氮和特殊的分级孔，PEI-PS-DVB 适合通过静电相互作用和氮与 Au 之间的特殊亲和力来吸附 AuNPs。吸附符合准一级动力学和 Langmuir 等温模型。基于 Langmuir 模型的最大吸附容量为 806.5mg/g。此外，PEI-PS-DVB 吸附 AuNPs 后可作为 4-硝基苯酚还原反应的高效催化剂，具有良好的可重复使用性。开发的分级多孔 PEI-PS-DVB 是一种具有高吸附容量的 AuNPs 理想吸附剂，而回收利用废 AuNPs 符合绿色和可持续发展的理念。
