Jonaki, Board of Radiation and Isotope Technology (BRIT), Department of Atomic Energy (DAE), CCMB Campus, Uppal Road, Hyderabad 500007, Andhra Pradesh, India.
Colloids Surf B Biointerfaces. 2010 Feb 1;75(2):490-5. doi: 10.1016/j.colsurfb.2009.09.023. Epub 2009 Sep 25.
Gum kondagogu (Cochlospermum gossypium), a naturally occurring tree biopolymer, is exploited as a biosorbent to remove metal ions from aqueous solutions. The removal efficiency of toxic metals by gum kondagogu was determined quantitatively in the order Cd2+ > Cu2+ > Fe2+ > Se2+ > Pb2+ > total Cr > Ni2+ > Zn2+ > Co2+ > As2+ at pH 5.0+/-0.1 and temperature 25+/-2 degrees C by inductively coupled plasma-mass spectrometry (ICP-MS). The biosorption (%) of various metal ions tested was found to be in the range of 97.3-16.7%, at pH 5.0. The morphological and mechanisms of interaction of toxic metal ions with gum kondagogu were assessed by scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM-EDXA) and X-ray diffraction (XRD) spectrum. The analysis indicated that biosorption process included morphological changes, precipitation, complexation and ion exchange mechanism for the removal of metal ions by the gum. XRD analysis indicated the amorphous nature of gum kondagogu, which facilitate metal biosorption. The metal ions adsorption leads to its deposition on the gum kondagogu matrix in a crystalline state.
树胶 kondagogu（棉团铁苋菜），一种天然存在的树生物聚合物，被用作生物吸附剂从水溶液中去除金属离子。通过电感耦合等离子体质谱法（ICP-MS）在 pH 值为 5.0+/-0.1 和温度为 25+/-2 摄氏度的条件下，定量确定了 gum kondagogu 对有毒金属的去除效率，顺序为 Cd2+>Cu2+>Fe2+>Se2+>Pb2+>总 Cr>Ni2+>Zn2+>Co2+>As2+。在 pH 值为 5.0 时，测试的各种金属离子的生物吸附（%）范围为 97.3-16.7%。通过扫描电子显微镜结合能量色散 X 射线分析（SEM-EDXA）和 X 射线衍射（XRD）谱评估了有毒金属离子与 gum kondagogu 相互作用的形态和机制。分析表明，生物吸附过程包括形态变化、沉淀、络合和离子交换机制，用于去除金属离子。XRD 分析表明 gum kondagogu 具有无定形性质，有利于金属的生物吸附。金属离子的吸附导致其以结晶状态沉积在 gum kondagogu 基质上。
