Faculty of Sciences, Chemistry Department, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt.
Faculty of Sciences, Chemistry Department, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt.
Int J Biol Macromol. 2017 Dec;105(Pt 1):1269-1278. doi: 10.1016/j.ijbiomac.2017.07.156. Epub 2017 Jul 27.
Nano titanium oxide (Nano-TiO) was used in this work as a solid support to solid-solid immobilize carboxymethyl cellulose via glutaraldehyde as an efficient cross linking reagent to produce a novel nanosized biocomposite (Nano-TiO-glu-CMC). The synthesized materials were characterized by FT-IR to confirm crosslinking reaction between the two species as well as by HR-TEM, SEM, TGA and surface area analysis. The particle size was found to correspond to 22.2-44.4nm for Nano-TiO-glu-CMC. The designed nanosized biocomposite was used and compared with Nano-TiO for separation and extraction of heavy metal ions such as Cd(II), Pb(II) and Hg(II) from aqueous solution by using batch experiment and microcolumn technique. The maximum metal sorption capacity values of Cd(II), Pb(II) and Hg(II) were established as 2440μmolg (pH 7), 2880μmolg (pH 6) and 1160μmolg (pH 3), respectively. Optimization of the extraction experiments confirmed the maximum adsorption upon using 0.025g biocomposite dosage and 30min contact time.
纳米二氧化钛（Nano-TiO）被用于这项工作中，作为一种固体载体，通过戊二醛将羧甲基纤维素进行固-固固定化，以生产一种新型纳米生物复合材料（Nano-TiO-glu-CMC）。通过傅里叶变换红外光谱（FT-IR）证实两种物质之间的交联反应，并用高分辨率透射电子显微镜（HR-TEM）、扫描电子显微镜（SEM）、热重分析（TGA）和比表面积分析对合成材料进行了表征。纳米二氧化钛-戊二醛-羧甲基纤维素的粒径被发现为 22.2-44.4nm。设计的纳米生物复合材料与纳米二氧化钛相比，通过批量实验和微柱技术，从水溶液中分离和提取重金属离子如 Cd(II)、Pb(II)和 Hg(II)。Cd(II)、Pb(II)和 Hg(II)的最大金属吸附容量值分别确定为 2440μmolg（pH 7）、2880μmolg（pH 6）和 1160μmolg（pH 3）。萃取实验的优化证实，当使用 0.025g 生物复合材料剂量和 30min 接触时间时，吸附量最大。
