栉孔扇贝壳粉对刚果红的吸附性能研究

Characteristics of congo red adsorption by Chlamys farreri shell powder

栉孔扇贝是中国养殖量最大的扇贝,其废弃的贝壳资源利用也成为了关注的热点。贝壳粉是一种天然的生物吸附剂,本文通过高温煅烧处理,进一步优化了栉孔扇贝壳的吸附性能,采用扫描电镜分析、红外光谱分析表征手段对其形貌、组成进行分析;同时探讨了不同贝壳粉煅烧温度、反应时间、反应温度、刚果红初始浓度对其吸附性能的影响以及吸附动力学模型和等温吸附模型。结果表明, 900℃下煅烧的贝壳粉吸附性能最好;吸附反应在5 min内迅速发生,在150 min后基本达到平衡;该反应符合准二级吸附动力学过程(R2=0.999 1),吸附等温线符合Freundlich模型,属于多相吸附,低温更有利于刚果红在煅烧栉孔扇贝壳粉上的吸附。以上结果对于解决印染废水的净化处理具有重要意义,也为栉孔扇贝壳废弃资源综合利用奠定理论基础。

Chlamys farreri,the largest cultured scallop in China,has been at the center of discussions owing to the potential utilization of its abundant discarded shell resources.Researchers have found that the shell powder obtained from this species is a natural biological adsorbent.Herein,we further optimized the adsorption performance of C.farreri shells through high-temperature calcination treatment.In addition,we analyzed the morphology and composition of the treated shells via scanning electron microscopy and Fourier transform infrared spectroscopy.We explored the effects of various factors,such as the calcination temperature of the shell powder,duration and temperature of the reaction,and the initial concentration of congo red on the adsorption performance.The adsorption kinetic model and isothermal adsorption model are also discussed.The results showed that the shell powder calcined at 900℃demonstrated the best adsorption performance.The adsorption reaction occurred rapidly within the first 5 min and reached equilibrium after 150 min.A pseudo-second-order kinetic model best described the adsorption,with a correlation coefficient R2 of 0.9991.Moreover,the Freundlich model accurately represented the adsorption isotherms,suggesting that the process involved multiphase adsorption.We also found that lower temperatures were more conducive to the adsorption of congo red on the C.farreri shell powder.These findings hold significant implications for the treatment of printing and dyeing wastewater.Furthermore,they provide a theoretical foundation for the future development and utilization of the shell waste from C.farreri.