Wawrzkiewicz Monika, Bartczak Przemysław, Jesionowski Teofil
Maria Curie-Sklodowska University, Faculty of Chemistry, Department of Inorganic Chemistry, Maria Curie-Sklodowska Sq. 2, 20-031 Lublin, Poland.
Poznan University of Technology, Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Berdychowo 4 Str., 60-965 Poznan, Poland.
Int J Biol Macromol. 2017 Jun;99:754-764. doi: 10.1016/j.ijbiomac.2017.03.023. Epub 2017 Mar 7.
A new biomaterial based on chitin and lignin was prepared and applied for the removal of hazardous dye C.I. Direct Blue 71 (DB71) from aqueous solutions and wastewaters. The dye sorption on the chitin/lignin biosorbent (Ch/L) was examined depending on the initial dye concentration (50-200mg/L), phase contact time (1-1440min), kind of auxiliaries (NaCl, NaSO, anionic surfactant SDS) and their concentrations (1-20g/L salts, 0.1-0.75g/L SDS), initial solution pH as well as temperature (20-50°C). The equilibrium and kinetic characteristics of C.I. Direct Blue 71 uptake by chitin/lignin followed by the Freundlich isotherm model and the pseudo-second order model rather than the Langmuir, Tempkin models, and pseudo-first order model. C.I. Direct Blue 71 adsorption on chitin/lignin was spontaneous (-2.86 to -8.14kJ/mol) and endothermic (60.1kJ/mol). The possibilities of dye elution and reuse by means of the batch method were investigated and as follows the chemical reaction is an inseparable sorption mechanism. Purification of wastewaters containing direct dyes was made with 91% efficiency after 1h of phase contact time. For comparison, data obtained or obtained results in the DB71-chitin (Ch) system were also presented.
制备了一种基于几丁质和木质素的新型生物材料，并将其用于从水溶液和废水中去除有害染料C.I.直接蓝71（DB71）。研究了几丁质/木质素生物吸附剂（Ch/L）对染料的吸附情况，考察了初始染料浓度（50 - 200mg/L）、相接触时间（1 - 1440min）、助剂种类（NaCl、NaSO、阴离子表面活性剂SDS）及其浓度（1 - 20g/L盐、0.1 - 0.75g/L SDS）、初始溶液pH以及温度（20 - 50°C）的影响。几丁质/木质素对C.I.直接蓝71的吸附平衡和动力学特征符合Freundlich等温线模型和准二级模型，而非Langmuir、Tempkin模型和准一级模型。几丁质/木质素对C.I.直接蓝71的吸附是自发的（-2.86至-8.14kJ/mol）且吸热的（60.1kJ/mol）。研究了采用分批法进行染料洗脱和重复使用的可能性，如下所示，化学反应是一种不可分割的吸附机制。相接触1小时后，含直接染料废水的净化效率达到91%。为作比较，还给出了在DB71 - 几丁质（Ch）体系中获得的数据或结果。
