Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeounju-si, Jeollabuk-do 561-756, Republic of Korea.
Division of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeounju-si, Jeollabuk-do 561-756, Republic of Korea.
J Hazard Mater. 2018 Feb 15;344:398-407. doi: 10.1016/j.jhazmat.2017.10.050. Epub 2017 Oct 24.
Although a thiourea-immobilized polystyrene sorbent has been reported to exhibit high Ag sorption capacity (135mg/g), it is not stable under the acidic conditions commonly employed for desorption. In this research, we synthesized novel thiourea-immobilized polystyrene (TA-PS) nanoparticles to be highly acid resistant via a two-step procedure from polystyrene nanoparticles: acetylation and the subsequent immobilization of thiourea. We investigated the influences of pH, contact time, and initial concentration of AgNO solution on the Ag sorption of the polymer nanoparticles and estimated the maximum Ag sorption capacity to be 190±5mg/g at a pH of 6. The sorption performance did not significantly decrease in tap water containing competing ions. The sorption kinetic data were well fitted to the pseudo-second-order kinetic model. Overall, the TA-PS nanoparticles exhibited a high Ag sorption capacity and high selectivity against alkaline and alkaline earth-metal ions. In particular, their high acid resistance allows them to be used for long time periods in sorption-desorption processes.
虽然已报道一种硫脲固定化聚苯乙烯吸附剂具有较高的银吸附容量（135mg/g），但在常用于解吸的酸性条件下不稳定。在这项研究中，我们通过两步法从聚苯乙烯纳米粒子制备了新型的硫脲固定化聚苯乙烯（TA-PS）纳米粒子，以使其具有高耐酸性：乙酰化和随后的硫脲固定化。我们研究了 pH 值、接触时间和 AgNO3溶液初始浓度对聚合物纳米粒子吸附银的影响，并估计在 pH 值为 6 时最大银吸附容量为 190±5mg/g。在含有竞争离子的自来水中，吸附性能没有明显下降。吸附动力学数据很好地符合拟二级动力学模型。总的来说，TA-PS 纳米粒子表现出高的银吸附容量和对碱性和碱土金属离子的高选择性。特别是，它们的高耐酸性使其能够在吸附-解吸过程中长时间使用。
