Rezaei Sabereh, Kuznicki Steven M
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada.
J Nanosci Nanotechnol. 2018 May 1;18(5):3619-3623. doi: 10.1166/jnn.2018.14698.
Adsorption of Cu2+ ions from aqueous solutions is an increasingly important problem. Nano-titanate ETS-2 (Engelhard Titanosilicate-2) was studied for Cu2+ removal from aqueous solutions through the batch technique at room temperature. Structural and chemical properties of both ETS-2 sorbent and aqueous solution were studied by different characterization tests such as Thermogravimetric Analysis, Energy Dispersive X-ray spectroscopy, X-ray Photoelectron Spectroscopy and Inductively Coupled Plasma measuremen. Copper adsorption capacity was found to increase upon raising the contact time or the pH of the solution. The maximum uptake of Cu2+ (99.9%) by ETS-2 occurred at pH of 6.7 and 30 min of contact time. The Cu2+ removal capacity of ETS-2 was found to be 53.58 mg/g at pH = 5.16, which improved to 54.02 mg/g, when rising the contact time to 90 min. Chemical properties of ETS-2 indicated that ETS-2 surface possessed sodium exchange sites making it a favourable sorbent for metal exchange.
从水溶液中吸附铜离子是一个日益重要的问题。通过室温下的批量技术，研究了纳米钛酸盐ETS-2（恩格尔哈德钛硅酸盐-2）从水溶液中去除铜离子的性能。通过热重分析、能量色散X射线光谱、X射线光电子能谱和电感耦合等离子体测量等不同表征测试，研究了ETS-2吸附剂和水溶液的结构及化学性质。发现随着接触时间或溶液pH值的增加，铜的吸附容量会提高。ETS-2对铜离子的最大吸附量（99.9%）出现在pH值为6.7且接触时间为30分钟时。在pH = 5.16时，ETS-2对铜离子的去除容量为53.58 mg/g，当接触时间延长至90分钟时，该容量提高到54.02 mg/g。ETS-2的化学性质表明，其表面具有钠交换位点，这使其成为金属交换的理想吸附剂。
