In this section, you can access to the latest technical information related to the FUTURE project topic.

Optimizing nanocarbon shell in zero-valent iron nanoparticles for improved electron utilization in Cr(VI) reduction

A core-shell structured zero-valent iron@carbon (ZVI@C) nanocompoiste was designed to improve the electron utilization of ZVI in the Cr(VI) reduction. The porosity of carbon layer in ZVI@C was optimized for improving the efficiency of electron utilization of ZVI in the Cr(VI) reduction process. The porous structure of carbon layer was controllably synthesized by adjusting the carbon source and the ratio of C/Fe in the precursor. The glucose was suggested as the optimal carbon source, and a high specific surface area (37.067?m2/g) was reached for the prepared ZVI@C when the ratio of C/Fe was controlled at 20. These ZVI@C performed well on Cr(VI) reduction, e.g. a complete reduction of Cr(VI) (2?mg/L) to Cr(III) within 10?min. The removal capacity (800?mg/g) exceeded previously recorded ZVI based adsorbents. The pH and initial Cr(VI) concentration were demonstrated as the key factors for the efficient electron utilization of ZVI. Furthermore, the efficiency of electron utilization of the ZVI increased up to 80% when the concentration of Cr(VI) was 2000?mg/L and the pH was controlled at 3, which was much higher than 8% of the naked ZVI.Core-shell structure improves electron utilization efficiency of ZVI in Cr(VI) reduction by up to 87.8%.

» Author: Na Zhou, Kedong Gong, Qian Hu, Xiang Cheng, Juying Zhou, Mengyao Dong, Ning Wang, Tao Ding, Bin Qiu, Zhanhu Guo

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