School of Water Conservancy & Environment, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Jan;26(2):1595-1605. doi: 10.1007/s11356-018-3453-5. Epub 2018 Nov 16.
This study mainly focuses on the preparation, characterization, and sorption performance for Cu(II) and Zn(II) by using nano-alumina material (NA) synthesized through the sol-gel method. The SEM, EDS, FT-IR, and XRD analysis methods were implemented to identify the micromorphology and crystal structure of the synthesized NA absorbent and its structure after the adsorbing procedure. The effect of effective variables including various absorbent dose, contact time, initial ion concentration, and temperature on the removal of Cu(II) and Zn(II) from aqueous solution by using NA was investigated through a single factor experiment. Kinetic studies indicated that adsorption of copper and zinc ions by NA was chemical adsorption. The adsorption isotherm data were fitted by Langmuir (R: 0.919, 0.914), Freundlich (R: 0.983, 0.993), and Temkin (R: 0.876, 0.863) isotherms, indicating that copper and zinc ions were easily adsorbed by NA with maximum adsorption capacities of 87.7 and 77.5 mg/g for Cu and Zn, respectively. Thermodynamic parameters indicated that the adsorption of Cu was spontaneous(G<0) and the adsorption of Zn might not be spontaneous (G > 0) by NA. Graphical abstract ᅟ.
本研究主要采用溶胶-凝胶法合成的纳米氧化铝材料（NA），研究其对 Cu(II)和 Zn(II)的制备、表征和吸附性能。采用 SEM、EDS、FT-IR 和 XRD 分析方法对合成的 NA 吸附剂的微观形貌和晶体结构及其吸附后的结构进行了鉴定。通过单因素实验考察了不同吸附剂用量、接触时间、初始离子浓度和温度等有效变量对水溶液中 Cu(II)和 Zn(II)去除的影响。动力学研究表明，NA 对铜、锌离子的吸附为化学吸附。吸附等温线数据分别通过 Langmuir（R：0.919，0.914）、Freundlich（R：0.983，0.993）和 Temkin（R：0.876，0.863）等温线拟合，表明铜、锌离子易被 NA 吸附，Cu 和 Zn 的最大吸附容量分别为 87.7 和 77.5 mg/g。热力学参数表明，Cu 的吸附是自发的（G<0），而 Zn 的吸附可能不是自发的（G>0）。
