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Designed biomolecule-cellulose complexes for palladium recovery and detoxification

机译：设计用于钯回收和解毒的生物分子纤维素复合物

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摘要

An efficient, selective and reusable biosorbent is important for precious metal recovery. This paper examines the recovery of palladium Pd(II) from wastewater on designed biomolecule-cellulose complexes. A genetically engineered fusion protein composed of palladium binding peptides (PdBP) and cellulose binding domains (CBD) was expressed in Escherichia coli and enabled the binding of cellulose for palladium recovery and detoxification. The results of this study indicated that the range of pH levels suitable for PdCBD-cellulose complexes is wide and that the effect of temperature on palladium recovery is insignificant. In addition, the PdCBD-cellulose complexes exhibited good reusability and a high selectivity for Pd(II) recovery. The maximum adsorption capacity of the PdCBD-cellulose was 175.44 mg g(-1), indicating a high adsorption capacity for Pd(II). The Langmuir adsorption isotherm was applied to describe the processes for removing Pd(II). The kinetics of the Pd(II) removal were identified as following a pseudo-second order rate equation. Furthermore, the results of a Lemna minor growth inhibition test showed effective detoxification of the designed complexes. The results of this study revealed that the designed biomolecule-cellulose complexes can be used to develop a selective process for recovering and detoxifying precious metals.
机译：高效，选择性和可重复使用的生物吸附剂对于贵金属的回收至关重要。本文研究了在设计的生物分子纤维素复合物上从废水中回收钯Pd（II）的方法。由钯结合肽（PdBP）和纤维素结合域（CBD）组成的基因工程融合蛋白在大肠杆菌中表达，使纤维素能够结合用于钯的回收和解毒。这项研究的结果表明，适用于PdCBD-纤维素复合物的pH值范围宽，温度对钯回收率的影响不明显。此外，PdCBD-纤维素复合物表现出良好的可重用性和对Pd（II）回收的高选择性。 PdCBD纤维素的最大吸附容量为175.44 mg g（-1），表明对Pd（II）的吸附容量较高。用Langmuir吸附等温线描述了去除Pd（II）的过程。 Pd（II）去除的动力学被确定为遵循伪二级速率方程。此外，Lemna小生长抑制试验的结果表明所设计的复合物具有有效的解毒作用。这项研究的结果表明，设计的生物分子纤维素复合物可用于开发一种选择性方法，用于回收和解毒贵重金属。

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