Abstract：
Carbon nanotubes were used to immobilize Chrysosporium fungus for building an adequate adsorbent to be used as an desirable sorbent for preconcentration and measurement of cadmium ultra-trace levels in various samples. After characterization, the potential of Chrysosporium/carbon nanotubes for the sorption of Cd(II) ions was scrutinized by the aid of central composite design, and comprehensive studies of sorption equilibrium, kinetics and thermodynamic aspects were accomplished. Then, the composite was utilized for preconcentration of ultra-trace cadmium levels, by a mini-column packed with Chrysosporium/carbon nanotubes, before its determination with ICP-OES. The outcomes vouchsafed that (i) Chrysosporium/carbon nanotube has a high tendency for selective and rapid sorption of cadmium ion, at pH 6.1, and (ii) kinetic, equilibrium, and thermodynamic studies showed a high affinity of the Chrysosporium/carbon nanotubes for cadmium ion. Also, the outcomes displayed that cadmium can quantitatively be sorbed at a flow speed lesser than 7.0 mL/min and a 1.0 M HCl solution (3.0 mL) was sufficient to desorbe the analyte. Eventually, preconcentration and measurement of Cd(II) in different foods and waters were successfully accomplished with good accuracy, high precision (RSDs ≤5.65%), and low limit of detection (0.015 μg/L).
摘要：
碳纳米管用于固定金孢子菌，以构建足够的吸附剂，可用作预浓缩和测量各种样品中超痕量镉的理想吸附剂。在表征之后，金孢子菌/碳纳米管吸附Cd（II）离子的潜力通过中央复合材料设计的帮助进行了审查，以及吸附平衡的综合研究，完成了动力学和热力学方面的工作。然后，该复合材料用于预浓缩超痕量镉，通过装有金孢子菌/碳纳米管的微型色谱柱，在用ICP-OES测定之前。结果证明（i）金孢子菌/碳纳米管具有选择性和快速吸附镉离子的高趋势，在pH6.1下，和（ii）动力学，均衡，热力学研究表明，金孢子菌/碳纳米管对镉离子具有很高的亲和力。此外，结果表明，镉可以以小于7.0mL/min的流速定量吸附，并且1.0MHCl溶液（3.0mL）足以解吸分析物。最终,成功地完成了不同食物和水中Cd（II）的富集和测量，并具有良好的准确性。高精度(RSD≤5.65%)，低检测限(0.015μg/L)。
