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通过Box-Behnken设计对Pb~(2+)的生物吸附过程主要参数进行响应曲面分析优化.利用扫描电子显微镜、能量弥散X射线探测器以及傅里叶变换红外光谱,分析Pb~(2+)对生物质表面的生物吸附机理和特点.通过扫描电子显微镜和能量弥散X射线探测器可观察到Rhodotorula mucilaginosa生物质的形态和组成元素,显示生物吸附发生后存在铅离子.在初始条件下,Pb~(2+)的质量浓度为30 mg/L,pH为5.45,利用Design-Expert软件,通过响应面法得到响应面图,可以看出铅离子对生物质的最佳吸收值达到1.45 mg/g,吸收时间为25 min.二次型方差分析(ANOVA)证明该模型的相关性,其变异系数C.V.=2.4%,表明实验结果的准确性和可靠性.
The Pb-2 + biosorption process parameters were optimized by response surface analysis using the Box-Behnken design.Using scanning electron microscopy, energy dispersive X-ray detector and Fourier transform infrared spectroscopy, The biosorption mechanisms and characteristics of biomass on the surface of the biomass were studied.The morphology and compositional elements of Rhodotorula mucilaginosa biomass were observed by scanning electron microscopy and energy dispersive X-ray detector, indicating the presence of lead ions after biosorption.In the initial conditions, Pb ~ (2+) was 30 mg / L and pH was 5.45. The response surface maps were obtained by response surface methodology using Design-Expert software. It can be seen that the optimal absorption of lead by biomass reached 1.45 mg / g, and the absorption time was 25 min. The quadratic analysis of variance (ANOVA) showed that the correlation coefficient of the model was CV = 2.4%, indicating the accuracy and reliability of the experimental results.