Liu Guangtian, Liang Jianjian, Zhang Jie
Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemistry Engineering, Yanshan University, Qinhuangdao 066004, China.
Polymers (Basel). 2022 Nov 12;14(22):4883. doi: 10.3390/polym14224883.
Adsorption is considered the most favorable method for heavy metal removal. In this paper, a low-cost, high-efficiency heavy metal adsorbent, mannitol-modified loofah (MML) was prepared. Some characterization methods are used to characterize the structure of MML, such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The adsorption behavior of MML for Cu(II) ions was explored under different conditions, such as the amount of adsorbent, pH, initial concentration of Cu(II) ions, and adsorption time. The results indicated that the adsorption capacity of MML for Cu(II) ions was greatly improved. When the initial concentration of Cu(II) ions was 900 mg/L and the pH is 5.0, the adsorption capacity (Q) was 888.9 mg/g at 298K, which was significantly higher than that of some other modified cellulose adsorbents. Isothermal adsorption results showed that the adsorption process was consistent with the Freundlich model. The adsorption kinetics conformed to the pseudo-second-order equation. Furthermore, the regeneration capability of MML indicates that MML is a cheap and excellent adsorbent for Cu(II) ions removal in wastewater treatment.
吸附被认为是去除重金属最有利的方法。本文制备了一种低成本、高效率的重金属吸附剂——甘露醇改性丝瓜络（MML）。采用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）等一些表征方法对MML的结构进行了表征。在不同条件下，如吸附剂用量、pH值、Cu（II）离子初始浓度和吸附时间，研究了MML对Cu（II）离子的吸附行为。结果表明，MML对Cu（II）离子的吸附容量有很大提高。当Cu（II）离子初始浓度为900mg/L且pH值为5.0时，在298K下吸附容量（Q）为888.9mg/g，明显高于其他一些改性纤维素吸附剂。等温吸附结果表明，吸附过程符合Freundlich模型。吸附动力学符合准二级方程。此外，MML的再生能力表明，MML是一种用于废水处理中去除Cu（II）离子的廉价且优良的吸附剂。
