Poznan University of Technology, Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, PL-60965 Poznan, Poland.
Poznan University of Technology, Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, PL-60965 Poznan, Poland.
J Environ Manage. 2017 Dec 15;204(Pt 1):123-135. doi: 10.1016/j.jenvman.2017.08.041. Epub 2017 Sep 3.
A comparative analysis was performed concerning the removal of two different organic dyes from model aqueous solution using an inorganic oxide adsorbent. The key element of the study concerns evaluation of the influence of the dyes' structure and their acid-base character on the efficiency of the adsorption process. The selection of sorbent material for this research - an MgO-SiO oxide system synthesized via a modified sol-gel route - is also not without significance. The relatively high porous structure parameters of this material (A = 642 m/g, V = 1.11 mL and S = 9.8 nm) are a result of the proposed methodology for its synthesis. Both organic dyes (C.I. Acid Blue 29 and C.I. Basic Blue 9) were subjected to typical batch adsorption tests, including investigation of such process parameters as time, initial adsorbate concentration, adsorbent dose, pH and temperature. An attempt was also made to estimate the sorption capacity of the oxide material with respect to the analyzed organic dyes. To achieve the objectives of the research - determine the efficiency of adsorption - it was important to perform a thorough physicochemical analysis of the adsorbents (e.g. FTIR, elemental analysis and porous structure parameters). The results confirmed the significantly higher affinity of the basic dye to the oxide adsorbents compared with the acidic dye. The regeneration tests, which indirectly determine the nature of the adsorbent/adsorbate interactions, provide further evidence for this finding. On this basis, a probable mechanism of dyes adsorption on the MgO-SiO oxide adsorbent was proposed.
采用无机氧化物吸附剂对模型水溶液中两种不同有机染料的去除进行了对比分析。研究的关键要素在于评估染料结构及其酸碱特性对吸附过程效率的影响。选择用于该研究的吸附剂材料-通过改良溶胶-凝胶法合成的 MgO-SiO 氧化物系统-也具有重要意义。该材料的相对较高的多孔结构参数（A = 642 m/g、V = 1.11 mL 和 S = 9.8 nm）是由于其合成方法所导致。两种有机染料（C.I.酸性蓝 29 和 C.I.碱性蓝 9）都进行了典型的批量吸附测试，包括研究时间、初始吸附质浓度、吸附剂剂量、pH 和温度等工艺参数。还尝试了用氧化物材料估算对分析有机染料的吸附容量。为了实现研究目标-确定吸附效率-对吸附剂进行彻底的物理化学分析（例如 FTIR、元素分析和多孔结构参数）非常重要。结果证实了与酸性染料相比，碱性染料对氧化物吸附剂具有更高的亲和力。间接确定吸附剂/吸附质相互作用性质的再生测试为此发现提供了进一步的证据。在此基础上，提出了染料在 MgO-SiO 氧化物吸附剂上吸附的可能机制。
