Department of Chemistry, Faculty of Science, Burapha University, Chonburi, Thailand.
Environ Technol. 2021 Sep;42(23):3572-3580. doi: 10.1080/09593330.2020.1740328. Epub 2020 Mar 18.
Acid-functionalized multi-walled carbon nanotube (MWCNTs-COOH) was prepared by acid treatment followed by decoration with magnetite (FeO) nanoparticles (FeO/MWCNTs-COOH) by co-precipitation of Fe/Fe in the colloidal suspension of MWCNTs-COOH. The adsorption capacity and separation efficiency of these two adsorbents were investigated for the removal of Cu ions in aqueous solution as water treatment adsorbents. The effect of reaction conditions, such as contact time, initial concentration of Cu ions, and adsorbent dosage, on the adsorption capacity of MWCNTs-COOH was investigated. It was found that contact time of 10 min, adsorbent dosage of 0.2 g/L and 15 mg/L as initial concentration of Cu ions are ideal conditions for maximum adsorption capacity (10.45 mg/g). The adsorption capacity of synthesized FeO/MWCNTs-COOH containing different weight percent of FeO (10, 25, 50 wt%) was explored for removal of Cu ions from aqueous solution and the best results achieved with 25 wt% FeO/MWCNTs-COOH, which exhibited optimum adsorption capacity of 9.50 mg/g and 97% separation efficiency. Further, Langmuir and Freundlich isotherm models were applied to validate experimental data obtained in this work for Cu adsorption.
酸功能化多壁碳纳米管（MWCNTs-COOH）通过酸处理后，通过在 MWCNTs-COOH 的胶体悬浮液中共同沉淀 Fe/Fe 来修饰磁性氧化铁（FeO）纳米颗粒（FeO/MWCNTs-COOH）。作为水处理吸附剂，研究了这两种吸附剂对水溶液中 Cu 离子的去除的吸附容量和分离效率。研究了反应条件（如接触时间、Cu 离子的初始浓度和吸附剂用量）对 MWCNTs-COOH 吸附容量的影响。结果发现，接触时间为 10 min，吸附剂用量为 0.2 g/L，Cu 离子初始浓度为 15 mg/L，是最大吸附容量（10.45 mg/g）的理想条件。还探索了含有不同重量百分比 FeO（10、25、50 wt%）的合成 FeO/MWCNTs-COOH 对水溶液中 Cu 离子去除的吸附容量，其中 25 wt% FeO/MWCNTs-COOH 的效果最佳，其吸附容量为 9.50 mg/g，分离效率为 97%。此外，还应用 Langmuir 和 Freundlich 等温模型来验证本工作中 Cu 吸附实验数据。
