Das Sujoy K, Guha Arun K
Department of Biological Chemistry, Indian Association for the Cultivation of Science, 2A&B, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India.
Colloids Surf B Biointerfaces. 2007 Oct 15;60(1):46-54. doi: 10.1016/j.colsurfb.2007.05.021. Epub 2007 Jun 2.
The manuscript describes removal of chromium from aqueous solution by biomass of different moulds and yeasts. The biomass of Termitomyces clypeatus (TCB) is found to be the most effective of all the fungal species tested. The sorption of hexavalent chromium by live TCB depends on the pH of the solution, the optimum pH value being 3.0. The process follows Langmuir isotherm (regression coefficient 0.998, chi(2)-square 5.03) model with uniform distribution over the surface which gets strong support from the X-ray elemental mapping of chromium adsorbed biomass. The amino, carboxyl, hydroxyl, and phosphate groups of the biomass are involved in chemical interaction with the chromate ion forming a cage like structure depicted by scanning electron microscopic (SEM) and Fourier transform infrared spectroscopic (FTIR) results. Desorption and FTIR studies also exhibited that Cr(6+) is reduced to trivalent chromium on binding to the cell surface. The level of chromium concentration present in the effluent of tannery industries' is reduced to a permissible limit using TCB as adsorbent.
该手稿描述了利用不同霉菌和酵母的生物质从水溶液中去除铬的过程。在所有测试的真菌物种中，鸡枞菌生物质（TCB）被发现是最有效的。活的TCB对六价铬的吸附取决于溶液的pH值，最佳pH值为3.0。该过程遵循朗缪尔等温线（回归系数0.998，卡方值5.03）模型，在表面均匀分布，这从吸附铬的生物质的X射线元素映射中得到了有力支持。生物质的氨基、羧基、羟基和磷酸基团参与与铬酸根离子的化学相互作用，形成扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）结果所描绘的笼状结构。解吸和FTIR研究还表明，Cr(6+)在与细胞表面结合时被还原为三价铬。使用TCB作为吸附剂，制革工业废水中的铬浓度水平降低到了允许的限度。
