Li Yuhan, Wang Xiaoli, Xia Jing, Zhou Guangwei, Wang Xiaomu, Wang Dingxuan, Zhang Junying, Cheng Jue, Gao Feng
Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China.
Polymers (Basel). 2023 May 23;15(11):2423. doi: 10.3390/polym15112423.
Around a quarter of annual worldwide silver consumption comes from recycling. It remains a primary target for researchers to increase the silver ion adsorption capacity of the chelate resin. Herein, a series of flower-like thiourea-formaldehyde microspheres (FTFM) possessing diameters of 15-20 μm were prepared via a one-step reaction under acidic conditions, and the effects of the monomer molar ratio and reaction time on the micro-flower morphology, specific surface area, and silver ion adsorption performance were explored. The nanoflower-like microstructure showed the maximum specific surface area 18.98 ± 0.949 m/g, which was 55.8 times higher than that of the solid microsphere control. As a result, the maximum silver ion adsorption capacity was 7.95 ± 0.396 mmol/g, which was 10.9 times higher than that of the control. Kinetic studies showed that the equilibrium adsorption amount of FTFM was 12.61 ± 0.016 mmol/g, which was 11.6 times higher than that of the control. Additionally, the isotherm study of the adsorption process was performed, and the maximum adsorption capacity of FTFM was 18.17 ± 1.28 mmol/g, which was 13.8 times that of the control according to the Langmuir adsorption model. Its high absorption efficiency, convenient preparation strategy, and low cost recommend FTFM bright for further use in industrial applications.
全球每年约四分之一的白银消费量来自回收利用。提高螯合树脂的银离子吸附能力仍然是研究人员的主要目标。在此，通过在酸性条件下的一步反应制备了一系列直径为15-20μm的花状硫脲-甲醛微球（FTFM），并探讨了单体摩尔比和反应时间对微花形态、比表面积和银离子吸附性能的影响。纳米花状微观结构的比表面积最大，为18.98±0.949 m/g，比固体微球对照物高55.8倍。结果，最大银离子吸附容量为7.95±0.396 mmol/g，比对照物高10.9倍。动力学研究表明，FTFM的平衡吸附量为12.61±0.016 mmol/g，比对照物高11.6倍。此外，还对吸附过程进行了等温线研究，根据朗缪尔吸附模型，FTFM的最大吸附容量为18.17±1.28 mmol/g，是对照物的13.8倍。其高吸附效率、简便的制备策略和低成本表明FTFM在工业应用中具有广阔的应用前景。
