Study on the Effects of Different Preparation Temperatures on the Physicochemical Properties of the Hydrothermal Charcoal of Dendrocalamus farinosus
[Objective]To systematically study the changes of physical and chemical properties of bamboo-based hydrothermal charcoal at different hydrothermal temperatures.[Method]In this paper,bamboo-based hydrothermal charcoal was prepared from Dendrocalamus farinosus at a series of hydrothermal temperatures(453,493,513,533 and 573 K),the physicochemical properties of hydrothermal charcoal such as element content,pore structure and surface functional groups were characterized,and the adsorption performance of uranium(U6+)was evaluated.[Result]The results showed that:the cultivated D.farinosus was rich in cellulose and hemicellulose,which could be preferentially converted into carbon micro-spheres at lower temperatures,this was conducive to forming the developed pore structures.The hydrothermal charcoal prepared in the low temperature zone contained both high yield and rich functional groups(453 and 493 K),and the bamboo-based hydrothermal charcoal prepared at 493 K temperature had the largest specific surface area(55.61 m2·g-1)and the smallest average pore size(7.77 nm),with the characteristics of high-quality adsorption structure.While the high temperature zone(513,533 and 573 K)had destroyed the high-quality adsorption structure and functional groups.The U6+adsorption test results further confirmed that the bamboo-based hydrothermal charcoal prepared at 493 K was the best for U6+adsorption,and the adsorption capacity reached 12.63 mg·g-1.[Conclusion]The U6+adsorption efficiency of hydrothermal charcoal from D.farinosus under the condition of 493 K is higher,and it has more advantages in resource utilization and nuclear pollution control.
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