六价铬离子在水体中呈现出强毒性,被多国列为高危险毒性物质,为探索Cr(Ⅵ)离子的新型处理方法,本次研究通过使用淀粉对蒙脱石进行改性制备淀粉改性的蒙脱石,探究其对Cr(Ⅵ)吸附的机理以及效果。通过Zeta电位、X射线衍射(XRD),傅式转换...六价铬离子在水体中呈现出强毒性,被多国列为高危险毒性物质,为探索Cr(Ⅵ)离子的新型处理方法,本次研究通过使用淀粉对蒙脱石进行改性制备淀粉改性的蒙脱石,探究其对Cr(Ⅵ)吸附的机理以及效果。通过Zeta电位、X射线衍射(XRD),傅式转换红外线光谱(FTIR),和扫描电镜(SEM)分析表征改性机理与改性蒙脱石特性。试验结果表明:通过实验制备10 g淀粉、淀粉改性蒙脱石对250 ml 10 mg/L Cr(Ⅵ)污染溶液进行吸附,分别达到了60.7%和55.9%的吸附率,具备较好的吸附效果,而实验制备10 g Na基蒙脱石对250 ml 10 mg/L Cr(Ⅵ)污染溶液进行吸附,吸附率仅为1.5%,说明其对Cr(Ⅵ)不具备吸附能力。通过FTIR对三种材料进行扫描,对比显示淀粉仅存在于蒙脱石的表面,通过降低蒙脱石的整体电负性,从而使蒙脱石具备了对Cr(Ⅵ)吸附能力,为Cr(Ⅵ)离子的吸附去除提供了新的研究思路与方向。展开更多
The microarray of DNA probes with 5′-NH2 and 5′-Tex/3′-NH2 modified terminus on 10 μm carboxylate functional beads surface in the presence of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) is characterized in...The microarray of DNA probes with 5′-NH2 and 5′-Tex/3′-NH2 modified terminus on 10 μm carboxylate functional beads surface in the presence of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) is characterized in the present paper. It was found that the microarray capacity of DNA probes on the beads surface depends on the pH of the aqueous solution, the concentration of DNA probe and the total surface area of the beads. On optimal conditions, the minimum distance of 20 mer single-stranded DNA probe microarrayed on beads surface is about 14 nm, while that of 20 mer double-stranded DNA probes is about 27 nm. If the probe length increases from 20 mer to 35 mer, its microarray density decreases correspondingly. Mechanism study shows that the binding mode of DNA probes on the beads surface is nearly parallel to the beads surface.展开更多
文摘六价铬离子在水体中呈现出强毒性,被多国列为高危险毒性物质,为探索Cr(Ⅵ)离子的新型处理方法,本次研究通过使用淀粉对蒙脱石进行改性制备淀粉改性的蒙脱石,探究其对Cr(Ⅵ)吸附的机理以及效果。通过Zeta电位、X射线衍射(XRD),傅式转换红外线光谱(FTIR),和扫描电镜(SEM)分析表征改性机理与改性蒙脱石特性。试验结果表明:通过实验制备10 g淀粉、淀粉改性蒙脱石对250 ml 10 mg/L Cr(Ⅵ)污染溶液进行吸附,分别达到了60.7%和55.9%的吸附率,具备较好的吸附效果,而实验制备10 g Na基蒙脱石对250 ml 10 mg/L Cr(Ⅵ)污染溶液进行吸附,吸附率仅为1.5%,说明其对Cr(Ⅵ)不具备吸附能力。通过FTIR对三种材料进行扫描,对比显示淀粉仅存在于蒙脱石的表面,通过降低蒙脱石的整体电负性,从而使蒙脱石具备了对Cr(Ⅵ)吸附能力,为Cr(Ⅵ)离子的吸附去除提供了新的研究思路与方向。
文摘The microarray of DNA probes with 5′-NH2 and 5′-Tex/3′-NH2 modified terminus on 10 μm carboxylate functional beads surface in the presence of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) is characterized in the present paper. It was found that the microarray capacity of DNA probes on the beads surface depends on the pH of the aqueous solution, the concentration of DNA probe and the total surface area of the beads. On optimal conditions, the minimum distance of 20 mer single-stranded DNA probe microarrayed on beads surface is about 14 nm, while that of 20 mer double-stranded DNA probes is about 27 nm. If the probe length increases from 20 mer to 35 mer, its microarray density decreases correspondingly. Mechanism study shows that the binding mode of DNA probes on the beads surface is nearly parallel to the beads surface.
