Department of Chemical Engineering, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1.
Carbohydr Polym. 2013 Apr 15;94(1):531-8. doi: 10.1016/j.carbpol.2013.01.081. Epub 2013 Feb 4.
In this work, we aimed at adsorbing the oligo-sugars of prehydrolysis liquor on precipitated calcium carbonate (PCC) to produce modified PCC. The results showed that the adsorptions of oligo-sugars, lignin and furfural were greater on porous PCC (PCC2) than on nano-sized PCC (PCC1) due to the larger surface area of PCC2. The adsorption reached its maximum in 5 h on PCC1, but it gradually increased on PCC2 due to the diffusion of oligo-sugars and lignin into the pores of PCC2. Also, the experimental isotherm and kinetic results were well fitted into Langmuir and pseudo-second order models, respectively. The adsorption was greater at a lower temperature (i.e. 40°C) and pH (i.e. 7). Alternatively, cationic poly acrylamide (CPAM) was added to the PHL/PCC system, which led to more promising results (than that to PHL/PCC system) with the maximum lignocelluloses adsorption of 0.36 g/g on PCC2, among which 0.22 g/g was oligo-sugars.
在这项工作中，我们旨在将预水解液中的寡糖吸附在沉淀碳酸钙（PCC）上，以制备改性 PCC。结果表明，由于 PCC2 的比表面积较大，寡糖、木质素和糠醛在多孔 PCC（PCC2）上的吸附大于纳米 PCC（PCC1）。在 PCC1 上，吸附在 5 小时达到最大值，但由于寡糖和木质素向 PCC2 的孔隙扩散，吸附逐渐增加。此外，实验等温线和动力学结果分别很好地拟合到 Langmuir 和拟二级模型。吸附在较低温度（即 40°C）和 pH（即 7）下较大。或者，将阳离子聚丙烯酰胺（CPAM）添加到 PHL/PCC 体系中，这导致在 PCC2 上的最大木质纤维素吸附量为 0.36 g/g，其中 0.22 g/g 是寡糖。
