College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
Ultrason Sonochem. 2021 Jan;70:105327. doi: 10.1016/j.ultsonch.2020.105327. Epub 2020 Sep 1.
In the present work, chitin suspensions after enzymolysis and sonoenzymolysis were taken as adsorbents to evaluate the adsorption properties of Congo red (CR) dyes. Compared with untreated chitin suspension, the CR adsorption performance was significantly improved after enzymolysis and even more after sonoenzymolysis. According to different adsorption kinetic and isotherm models, Langmuir isotherm and the pseudo-second order model were more reliable to describe the adsorption process of CR onto different chitin samples and demonstrated a monolayer and favorable physisorption process. What's more, negative values of ΔG (Gibbs free energy change) and the shifts to higher negative values with the temperature increasing from adsorption thermodynamic study proved a spontaneous CR adsorption process. The structural characterization before and after adsorption further verified the physical adsorption between chitin and CR, and a larger specific area and higher porosity of chitin suspension was obtained after sonoenzymolysis with more available active sites.
在本工作中，采用酶解和超声酶解后的甲壳素悬浮液作为吸附剂，评价了刚果红（CR）染料的吸附性能。与未处理的甲壳素悬浮液相比，酶解后，甚至超声酶解后，CR 的吸附性能有了显著提高。根据不同的吸附动力学和等温线模型，Langmuir 等温线和拟二级动力学模型更能可靠地描述 CR 吸附到不同甲壳素样品的过程，表明这是一个单层和有利的物理吸附过程。此外，从吸附热力学研究中得出的ΔG（吉布斯自由能变化）的负值以及随着温度升高向更高负值的偏移，证明了 CR 的吸附过程是自发的。吸附前后的结构表征进一步验证了甲壳素和 CR 之间的物理吸附，并且超声酶解后甲壳素悬浮液具有更大的比表面积和更高的孔隙率，获得了更多可用的活性位点。
