Preparation of a double-network hydrogel based on wastepaper and its application in the treatment of wastewater containing copper(ii) and methylene blue.
Preparation of a double-network hydrogel based on wastepaper and its application in the treatment of wastewater containing copper(ii) and methylene blue.
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作者：
为了回收利用废纸，制备了废纸/丙烯酰胺双网络水凝胶(WP/PAM)，将WP转化为处理重金属和染料废水的高效吸附剂。用扫描电子显微镜(SEM)、热重分析(TGA)、溶胀性能(SR)、傅立叶变换红外光谱(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的表征。批处理实验表明，铜(II)和亚甲基蓝的吸附过程符合准二级动力学模型和朗缪尔模型。其对Cu2+和MB的最大吸附容量分别为142.2 mg g−1和1714.5 mg g−1。Cu(II)在WP/PAM上的吸附机理与离子交换和络合作用有关，而MB的吸附机理与氢键和静电相互作用有关。此外，WP/PAM对模拟废水的处理效果良好。再生试验表明，经过6次循环后，WP/PAM可成功重复使用。本工作为可湿性粉剂的回收利用提供了一种替代选择，并为染料和重金属废水的处理提供了一种有潜力的吸附剂。本研究创新性地将废纸与丙烯酰胺复合，制备了废纸/丙烯酰胺双网络水凝胶，并将其应用于处理含铜(II)和亚甲基蓝的混合废水。
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−1 and 1714.5 mg g−1, 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. In this research, wastepaper was innovatively compounded with acrylamide to prepare a wastepaper/acrylamide double-network hydrogel and was applied to the treatment of the mixed wastewater containing copper(ii) and methylene blue.
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