Yang Wei, Zhang Lei, Li Meng, Zhang Ting, Liu Yue, Liu Juan
School of Environmental Science and Engineering, Hubei Polytechnic University Huangshi 435003 Hubei China
MWR Standard & Quality Control Research Institute Hangzhou 310024 Zhejiang China.
RSC Adv. 2023 Oct 16;13(43):30176-30189. doi: 10.1039/d3ra05315f. eCollection 2023 Oct 11.
In this work, bamboo charcoal (BC) is prepared by pyrolysis of bamboo. Then, KOH modification and surface deposition of Goethite (α-FeOOH) are performed to obtain a new KOH-modified BC loaded with α-FeOOH (FKBC) adsorbent for copper (Cu) and fluoride (F) ion adsorption from aqueous solution. Surface morphology and physiochemical properties of the prepared adsorbent are characterized by scanning electron microscopy-energy dispersive spectrometer, X-ray diffraction, and N adsorption-desorption. The effect of pH, contact time, adsorbent dosage, and initial concentration on Cu and F adsorption is also investigated. In addition, adsorption kinetics and isotherms are fitted to pseudo-second-order kinetics and Langmuir model, respectively. Thermodynamic parameters suggest that the adsorption process is spontaneous and endothermic. The adsorption mechanism is further characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The Cu absorption mainly occurs through ion exchange, coordination reactions, and surface precipitation, while the F adsorption mainly occurs ion exchange and hydrogen bonding. The selective adsorption experiments reveal that FKBC has good selectivity for Cu and F. The adsorption-desorption experimental results indicate that FKBC can be reused for Cu and F adsorption after regeneration. Results indicate that FKBC can be a promising adsorbent for Cu and F removal from aqueous solutions.
在本研究中，通过竹子热解制备竹炭（BC）。然后，进行KOH改性和针铁矿（α-FeOOH）的表面沉积，以获得一种负载α-FeOOH的新型KOH改性竹炭（FKBC）吸附剂，用于从水溶液中吸附铜（Cu）和氟化物（F）离子。通过扫描电子显微镜-能谱仪、X射线衍射和N吸附-脱附对制备的吸附剂的表面形貌和理化性质进行表征。还研究了pH值、接触时间、吸附剂用量和初始浓度对Cu和F吸附的影响。此外，吸附动力学和等温线分别拟合为伪二级动力学和朗缪尔模型。热力学参数表明吸附过程是自发的且吸热的。通过傅里叶变换红外光谱和X射线光电子能谱进一步表征吸附机理。Cu的吸附主要通过离子交换、配位反应和表面沉淀发生，而F的吸附主要通过离子交换和氢键发生。选择性吸附实验表明FKBC对Cu和F具有良好的选择性。吸附-脱附实验结果表明，FKBC再生后可重复用于Cu和F的吸附。结果表明，FKBC有望成为从水溶液中去除Cu和F的吸附剂。
