Zhao Xinkun, Jia Bingxin, Sun Qianqian, Jiao Gaojie, Liu Lili, She Diao
College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
Beijing Zhongjing Tongchuang Energy Environment Technique Co., Ltd., Beijing 100049, People's Republic of China.
R Soc Open Sci. 2018 Sep 26;5(9):180472. doi: 10.1098/rsos.180472. eCollection 2018 Sep.
Electrosorption is a novel desalination technique that has many advantages in the treatment of sewage. However, commercially available activated carbon electrodes for electrosorption commonly have low microporosity, poor moulding performance, and low adsorption and regeneration efficiency. Here, we evaluated a novel adsorbent material, activated carbon fibre felt (ACFF), for electrosorption of chromium ions (Cr) in sewage treatment. The ACFF was modified with 20% nitric acid and its modified structure was characterized. The modified ACFF was used as an adsorbing electrode to investigate its desalination effect by electrosorption. Results showed that compared with those of unmodified ACFF, the modified ACFF had more carbonyl and carboxyl groups and the specific surface area, average pore size and micropore volume of the modified ACFF also improved by 32.2%, 2.5% and 23.1%, respectively. The kinetics of Cr adsorption conformed to the pseudo-second-order kinetic equation, and the adsorption isotherm conformed to the Langmuir model. In addition, the regeneration rate of the modified ACFF electrode was more than 94%. In conclusion, the modified ACFF exhibits excellent electrosorption and regeneration performance for Cr removal from water and thus is of great value for promotion in sewage treatment.
电吸附是一种新型脱盐技术，在污水处理方面具有诸多优势。然而，市售的用于电吸附的活性炭电极通常微孔率低、成型性能差且吸附和再生效率低。在此，我们评估了一种新型吸附材料——活性炭纤维毡（ACFF），用于污水处理中铬离子（Cr）的电吸附。用20%的硝酸对ACFF进行改性，并对其改性结构进行了表征。将改性后的ACFF用作吸附电极，研究其电吸附脱盐效果。结果表明，与未改性的ACFF相比，改性后的ACFF含有更多的羰基和羧基，其比表面积、平均孔径和微孔体积分别提高了32.2%、2.5%和23.1%。Cr吸附动力学符合准二级动力学方程，吸附等温线符合朗缪尔模型。此外，改性ACFF电极的再生率超过94%。综上所述，改性后的ACFF在从水中去除Cr方面表现出优异的电吸附和再生性能，因此在污水处理中具有很大的推广价值。
