School of Environment, Northeast Normal University, No. 2555 Jingyue Street, Changchun, Jilin, 130117, China.
Environ Sci Pollut Res Int. 2018 May;25(13):12361-12372. doi: 10.1007/s11356-018-1516-2. Epub 2018 Feb 18.
Carbon nanotubes (CNTs)/agarose (AG) membrane on the ITO (indium tin oxide) conductive glass, with high efficiency of electrocatalytic degradation for rhodamine B (Rh-B) in water, was prepared using an easy and green method. The prepared CNTs/AG membrane was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectra (EDS), infrared spectroscopy (IR), and electrochemical impedance spectroscopy (EIS). The results revealed that CNTs were dispersed in the AG membrane. Additionally, the electrocatalytic activities for Rh-B were conducted on the electrochemical workstation with a three-electrode system. Both initial pH and potential played an important role in the process of electrocatalytic degradation. At pH 3 and potential reaching 4 V, the removal rate of Rh-B (10 mg/L) in water achieved 96% within 20 min. The stability of the prepared CNTs/AG membrane was also investigated. Besides, the toxicities of the main intermediates from the electrocatalytic degradation for Rh-B were calculated using the ECOSAR program and EPIWIN software, and results indicated that the toxicities of some intermediates were higher than those of the parent pollutant (Rh-B). These findings provided a light-spot to simplify the preparation of efficient working electrode and emphasized the possible potential risks from intermediates at the same time.
采用一种简单、绿色的方法，在掺锡氧化铟（ITO）导电玻璃上制备了碳纳米管（CNTs）/琼脂糖（AG）膜，该膜对水中罗丹明 B（Rh-B）具有高效的电催化降解性能。通过扫描电子显微镜（SEM）、X 射线衍射（XRD）、能谱（EDS）、红外光谱（IR）和电化学阻抗谱（EIS）对制备的 CNTs/AG 膜进行了表征。结果表明，CNTs 分散在 AG 膜中。此外，在三电极系统电化学工作站上对 Rh-B 的电催化活性进行了测试。初始 pH 值和电位在电催化降解过程中起着重要作用。在 pH 值为 3 和电位达到 4 V 的条件下，水中 10 mg/L 的 Rh-B 在 20 min 内的去除率达到 96%。还研究了制备的 CNTs/AG 膜的稳定性。此外，利用 ECOSAR 程序和 EPIWIN 软件计算了 Rh-B 电催化降解过程中主要中间体的毒性，结果表明，一些中间体的毒性高于母体污染物（Rh-B）。这些发现为简化高效工作电极的制备提供了一个亮点，并同时强调了中间体可能存在的潜在风险。
