Zero-valent iron particles embedded on the mesoporous silica–carbon for chromium (VI) removal from aqueous solution
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Nanoscale zero-valent iron (nZVI) particles were embedded on the walls of mesoporous silica–carbon (MSC) under the conditions of high-temperature carbonization and reduction and used to remove chromium (VI) from aqueous solution. The structure and textural properties of nZVI–MSC were characterized by the powder X-ray diffraction, transmission electron microscopy and N2 adsorption and desorption. The results show that nZVI–MSC has highly ordered mesoporous structure and large surface area, indistinguishable with that of MSC. Compared with the support MSC and iron particles supported on the activated carbon (nZVI/AC), nZVI–MSC exhibited much higher Cr(VI) removal efficiency with about 98 %. The removal process obeys a pseudo first-order model. Such excellent performance of nZVI–MSC could be ascribed to the large surface and iron particles embedded on the walls of the MSC, forming an intimate contact with the MSC. It is proposed that this feature might create certain micro-electrode on the interface of iron particles and MSC, which prevented the formation of metal oxide on the surface and provided fresh Fe surface for Cr(VI) removal.
KeywordsZero-valent iron Mesoporous silica–carbon Embedded Chromium Environment Remediation
This work was financially sponsored by the National Natural Science Foundation of China (Grant No.: 21606028), by the Science and Technology Project from Chongqing Education Commission (KJ1500625, KJZH14210) and by the Scientific Research Foundation of Chongqing Technology and Business University (2016-56-03).
- Choi H, Al-Abed SR, Agarwa IS, Dionysiou DD (2008) Synthesis of reactive nano-Fe/Pd bimetallic system-impregnated activated carbon for the simultaneous adsorption and dechlorination of PCBs. Chem Mater 203:649–3655Google Scholar
- Sheng G, Hu J, Li H, Li JX, Huang YY (2016) Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study. Chemosphere 68:1861–1866Google Scholar
- Wu YW, Zhang J, Liu JF, Chen L, Deng ZL, Han MX, Wei XS, Yu AM, Zhang HL (2012) Fe3O4@ZrO2 nanoparticles magnetic solid phase extraction coupled with flame atomic absorption spectrometry for chromium(III) speciation in environmental and biological samples. Appl Surf Sci 258:6772–6776CrossRefGoogle Scholar