Institute of Environmental pollution and health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, People's Republic of China.
Guangdong Polytechnic of Environmental Protection Engineering, Foshan, People's Republic of China.
Environ Technol. 2022 Sep;43(21):3319-3328. doi: 10.1080/09593330.2021.1921050. Epub 2021 Jun 15.
A simple and low-cost route to fabricate sepiolite-supported bimetallic Fe/Ni (Sep-Fe/Ni) nanoparticles was obtained by synchronous liquid phase reduction method. The as prepared composite was used to remove triclosan (TCS) from aqueous solutions. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller (BET) analysis were used for characterization of the materials. As the supporting material, Sep dispersed Fe/Ni nanoparticles on its surface effectively and reduced the agglomeration phenomenon, providing more reactive sites. Sep-Fe/Ni had a large surface area of 90.5 m/g, which was considerably higher than that of Fe/Ni (9.2 m/g). Sep-Fe/Ni exhibited an enhanced TCS removal efficiency, as compared to the Fe/Ni and Sep materials. Operation factors, including the solution pH, initial TCS concentration, and material dosage, were investigated and found to be influential for TCS removal. The kinetic analysis indicated that the depletion of TCS in aqueous solutions conformed to the pseudo-first-order kinetic model under optimized conditions. The transformation pathway of TCS was studied in detail, revealing that the dechlorination of TCS by Sep-Fe/Ni is a stepwise reaction, namely from TCS to di-chlorinated intermediates, with the newly formed intermediate products also degrading into mono-chlorinated products by further reductive dechlorination. This study demonstrated that Sep-Fe/Ni is a promising reductant for TCS removal in water.
通过同步液相还原法，制备了一种简单且低成本的海泡石负载双金属 Fe/Ni（Sep-Fe/Ni）纳米粒子的方法。将所制备的复合材料用于从水溶液中去除三氯生（TCS）。采用 X 射线衍射、扫描电子显微镜、透射电子显微镜和 Brunauer-Emmett-Teller（BET）分析对材料进行了表征。作为支撑材料，Sep 有效地将 Fe/Ni 纳米粒子分散在其表面上，减少了团聚现象，提供了更多的反应活性位。Sep-Fe/Ni 的比表面积为 90.5 m/g，明显高于 Fe/Ni（9.2 m/g）。与 Fe/Ni 和 Sep 材料相比，Sep-Fe/Ni 表现出更高的 TCS 去除效率。考察了操作因素，包括溶液 pH 值、初始 TCS 浓度和材料用量，发现它们对 TCS 去除有影响。动力学分析表明，在优化条件下，水溶液中 TCS 的消耗符合准一级动力学模型。详细研究了 TCS 的转化途径，表明 Sep-Fe/Ni 对 TCS 的脱氯是分步反应，即从 TCS 到二氯代中间体，新生成的中间产物也通过进一步的还原脱氯降解为单氯代产物。这项研究表明，Sep-Fe/Ni 是一种很有前途的水中 TCS 去除还原剂。
