Chen Yaoning, Li Linshenzhang, Li Yuanping, Liu Yihuan, Chen Yanrong, Li Hui, Li Meiling, Xu Fangting, Liu Yuqing
College of Environmental Science and Engineering, Hunan University Changsha 410082 China
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education Changsha 410082 China.
RSC Adv. 2021 May 19;11(29):18131-18143. doi: 10.1039/d1ra02321g. eCollection 2021 May 13.
To reclaim and utilize wastepaper (WP), a WP/acrylamide double-network hydrogel (WP/PAM) was prepared to transform WP into efficient adsorbent for heavy metals and dye wastewater treatment. The structure and properties of the WP/PAM were characterized systematically by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), swelling performance (SR), Fourier transform infrared spectrum (FTIR), and X-ray photoelectron spectroscopy (XPS). Batch experiments showed that the adsorption process of Cu(ii) and MB followed the pseudo-second-order kinetic model and the Langmuir model. The maximum adsorption capacities of the WP/PAM for Cu(ii) and MB were 142.2 mg g and 1714.5 mg g, respectively. The adsorption mechanism of Cu(ii) on the WP/PAM was related to ion exchange and complexation, while MB adsorption was driven by hydrogen bonding and electrostatic interaction. Besides, the WP/PAM performed well in treating simulated wastewater. The regeneration test indicated that the WP/PAM could be successfully reused after 6 cycles. This work provided an alternative choice for the recycling of WP and produced a potential adsorbent for the dye and heavy metals wastewater treatment.
为了回收利用废纸（WP），制备了一种WP/丙烯酰胺双网络水凝胶（WP/PAM），将WP转化为用于处理重金属和染料废水的高效吸附剂。通过扫描电子显微镜（SEM）、热重分析（TGA）、溶胀性能（SR）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对WP/PAM的结构和性能进行了系统表征。批量实验表明，Cu（ii）和亚甲基蓝（MB）的吸附过程遵循准二级动力学模型和朗缪尔模型。WP/PAM对Cu（ii）和MB的最大吸附容量分别为142.2 mg/g和1714.5 mg/g。Cu（ii）在WP/PAM上的吸附机制与离子交换和络合有关，而MB的吸附是由氢键和静电相互作用驱动的。此外，WP/PAM在处理模拟废水方面表现良好。再生试验表明，WP/PAM在6个循环后可以成功重复使用。这项工作为WP的回收提供了一种替代选择，并为染料和重金属废水处理生产了一种潜在的吸附剂。
