Zirconia enrichment in zircon sand by selective fungus-mediated bioleaching of silica
Zirconia enrichment in zircon sand by selective fungus-mediated bioleaching of silica
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DOI：
10.1021/la062535x
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发表时间：
2007-04-24
期刊：
影响因子：
3.9
通讯作者：
Sastry, Murali
中科院分区：
文献类型：
--
作者：
Bansal, Vipul;Syed, Asad;Sastry, Murali
氧化锆生产的重要途径之一是通过化学处理和从锆英砂(ZrSixOy)中脱除二氧化硅。我们在这里提出了一种完全绿色的化学方法来富集锆英砂中的氧化锆；这是基于真菌尖孢镰刀菌与锆英砂的反应，通过选择性地对二氧化硅纳米颗粒进行细胞外生物浸出的过程。由于这种反应不会导致锆石同时从砂子中淋出，因此在锆英砂中会有锆石成分的富集化。我们认为，真菌酶专门水解沙子中存在的硅酸盐形成硅酸，在某些其他真菌酶的缩合作用下，会在室温下合成二氧化硅纳米颗粒。这种真菌介导的双重方法可能在低成本、环保、室温下从锆英砂等潜在廉价的自然可获得原材料合成具有重要技术意义的氧化物纳米材料方面具有广泛的商业意义。
One of the important routes for the production of zirconia is by chemical treatment and removal of silica from zircon sand (ZrSixOy). We present here a completely green chemistry approach toward enrichment of zirconia in zircon sand; this is based on the reaction of the fungus Fusarium oxysporum with zircon sand by a process of selective extracellular bioleaching of silica nanoparticles. Since this reaction does not result in zirconia being simultaneously leached out from the sand, there is a consequent enrichment of the zirconia component in zircon sand. We believe that fungal enzymes specifically hydrolyze the silicates present in the sand to form silicic acid, which on condensation by certain other fungal enzymes results in room-temperature synthesis of silica nanoparticles. This fungus-mediated twofold approach might have vast commercial implications in low-cost, ecofriendly, room-temperature syntheses of technologically important oxide nanomaterials from potentially cheap naturally available raw materials like zircon sand.