用玉米芯硅酸钠珠同时去除水中的酚、Cu 和 Cd。
Simultaneous removal of phenol, Cu and Cd from water with corn cob silica-alginate beads.
机构信息
Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea; School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583-0817, USA.
Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea.
出版信息
J Hazard Mater. 2014 May 15;272:129-36. doi: 10.1016/j.jhazmat.2014.03.010. Epub 2014 Mar 18.
Phenol and heavy metals in petroleum waste are environmental and human health concerns, but physicochemical removal is often cost-prohibitive and can produce toxic secondary products and treatment residues. An environmentally benign alternative combines corn cob silica with alginate and immobilized bacteria into beads for treating contaminated water. The concentration of phenol was decreased >92% by Pseudomonas putida YNS1 on aliginate-silica beads (2%, w/v) after equilibrating for 96h with water containing 214mg phenol/L. GC-MS analysis indicated formation of benzoquinone and other polar products. Beads containing corn cob silica decreased Cu concentrations by 84-88% and Cd by 83-87% within 24h. In a mixture of 114mg phenol, 43mg Cu and 51mg Cd/L, phenol removal (93% within 96h) only occurred with beads containing the silica and bacterial strain. Beads containing corn cob silica removed >97% of the Cu and >99% of the Cd, critical for reducing toxicity to the bacteria. Beads with the immobilized strain removed phenol when zeolite was used instead of corn cob silica, but beads with silica were more effective for Cu and Cd removal. Results show the potential of corn cob silica combined with alginate and immobilized bacteria for removing phenol and heavy metals from contaminated water.
石油废水中的酚类物质和重金属是对环境和人类健康的关注焦点，但物理化学去除方法通常成本过高，并且可能会产生有毒的二次产物和处理残留物。一种环保的替代方法是将玉米芯硅和藻酸盐与固定化细菌结合在一起，制成珠体，用于处理受污染的水。经过 96 小时的平衡，假单胞菌 YNS1 在含有 214mg/L 苯酚的水中，用 2%（w/v）的藻酸盐-硅珠体将苯酚的浓度降低了>92%。GC-MS 分析表明形成了苯醌和其他极性产物。在含有 114mg/L 苯酚、43mg/L Cu 和 51mg/L Cd 的混合物中，含有玉米芯硅的珠体在 24 小时内将 Cu 的浓度降低了 84-88%，将 Cd 的浓度降低了 83-87%。在含有玉米芯硅的珠体中，酚类物质（在 96 小时内去除 93%）的去除只发生在含有硅和细菌菌株的珠体中。含有玉米芯硅的珠体去除了>97%的 Cu 和>99%的 Cd，这对于降低对细菌的毒性至关重要。当沸石代替玉米芯硅时，固定化菌株的珠体可以去除酚类物质，但含有硅的珠体更有效地去除 Cu 和 Cd。结果表明，玉米芯硅与藻酸盐和固定化细菌结合具有从受污染的水中去除酚类物质和重金属的潜力。
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