Department of Bioprocess Engineering, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
J Hazard Mater. 2012 Aug 15;227-228:309-16. doi: 10.1016/j.jhazmat.2012.05.065. Epub 2012 May 27.
In this study magnetic separable photocatalyst beads containing maghemite nanoparticles (γ-Fe(2)O(3)) in polyvinyl alcohol (PVA) polymer were prepared and used in the reduction of Cr(VI) to Cr(III) in an aqueous solution under sunlight. The unique superparamagnetic property of the photocatalyst contributed by the γ-Fe(2)O(3) and robust property of PVA polymer allow the magnetic beads to be recovered easily and reused for at least 7 times without washing. The concentration of γ-Fe(2)O(3) was varied from 8% (v/v) to 27% (v/v) and the results revealed that the beads with 8% (v/v) γ-Fe(2)O(3) exhibited the best performance where Cr(VI) was reduced to Cr(III) in only 30 min under sunlight. The use of the PVA has improved the bead properties and life cycle of beads which is in line with sustainable practices.
在这项研究中，制备了含有磁铁矿纳米颗粒（γ-Fe(2)O(3)）的聚乙烯醇（PVA）聚合物磁性分离光催化剂珠，并将其用于在阳光下将水溶液中的 Cr(VI)还原为 Cr(III)。光催化剂的独特超顺磁特性由 γ-Fe(2)O(3)提供，而 PVA 聚合物的坚固特性允许磁性珠容易地回收并重复使用至少 7 次而无需清洗。γ-Fe(2)O(3)的浓度从 8%（v/v）变化到 27%（v/v），结果表明，在阳光下，含有 8%（v/v）γ-Fe(2)O(3)的珠在仅 30 分钟内将 Cr(VI)还原为 Cr(III)，表现出最佳性能。PVA 的使用提高了珠的性能和珠的生命周期，符合可持续发展的实践。
