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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Characterization of a Thiourea Derivative of Chitosan for Platinum Recovery
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Synthesis and Characterization of a Thiourea Derivative of Chitosan for Platinum Recovery

机译：壳聚糖硫脲衍生物铂的合成及表征

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Chitosan is effective at removing platinum from dilute solutions, but sorption properties are significantly affected by the presence of competitor anions, such as chloride and, especially, sulfate anions. Sorption capacities in such complex solutions are enhanced by grafting thiourea through glutaraldehyde lkinkage. The influence of the amount of glutaraldehyde and thiourea in the impregnation bath was investigated and optimized with special attention to the composition of the solution and the type of acid used for pH control. This modification involves a change in the sorption mechanism: While glutaraldehyde-crosslinked chitosan adsorbs platinum through an-ion-exchange mechanism, the thiourea derivative of chitosan acts as a chelating resin, less sensitive to ionic strength and competitor anions. Platinum sorption is also less sensitive to pH, and increasing the sulfate anion concentration has a limited effect on platinum sorption in comparison with the crosslinked sorbent. Thiourea grafting seems to increase sorption kinetics, especially in solutions controlled with sulfuric acid. SEM-EDAX techniques as well as FTIR analyses were used to characterize chemical modifications of the sorbent.
机译：壳聚糖可以有效地从稀溶液中去除铂，但是吸附性能会受到竞争阴离子（例如氯离子，尤其是硫酸根阴离子）的影响。通过戊二醛基团接枝硫脲，可增强在这种复杂溶液中的吸附能力。研究并优化了浸渍浴中戊二醛和硫脲的量的影响，并特别注意溶液的组成和用于控制pH的酸的类型。这种修饰涉及吸附机理的变化：虽然戊二醛交联的壳聚糖通过阴离子交换机理吸附铂，但壳聚糖的硫脲衍生物充当螯合树脂，对离子强度和竞争性阴离子较不敏感。铂吸附对pH的敏感性也较低，与交联吸附剂相比，增加硫酸根阴离子浓度对铂的吸附作用有限。硫脲接枝似乎可以增加吸附动力学，尤其是在硫酸控制的溶液中。 SEM-EDAX技术以及FTIR分析用于表征吸附剂的化学改性。

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