Wasilewska Małgorzata, Deryło-Marczewska Anna
Department of Physical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland.
Materials (Basel). 2022 Sep 1;15(17):6049. doi: 10.3390/ma15176049.
In this work, alginate-carbon composites with different active carbon content were synthesized and studied by various techniques. The obtained materials can be used as adsorbents in the processes of removing organic pollutants from water. In this study, the effect of the immobilization of activated carbon in calcium alginate was investigated. Textural properties were determined by measuring low-temperature nitrogen adsorption/desorption isotherms. The largest specific surface area was recorded for ALG_C8 and amounted to 995 m/g. The morphology of alginate materials was determined on the basis of scanning electron microscopy. The adsorption properties were estimated based on the measurements of equilibrium and adsorption kinetics. The highest sorption capacities were 0.381 and 0.873 mmol/g for ibuprofen and diclofenac, respectively. The generalized Langmuir isotherm was used to analyze the equilibrium data. A number of equations and kinetic models were used to describe the adsorption rate data, including first (FOE) and second (SOE) order kinetic equations, 1,2-mixed-order kinetic equation (MOE), fractal-like MOE equation (f-MOE), multi-exponential equation (m-exp), in addition to diffusion models: intraparticle diffusion model (IDM) and pore diffusion model (PDM). Thermal stability was determined on the basis of data from thermal analysis in an atmosphere of synthetic air.
在本工作中，合成了具有不同活性炭含量的海藻酸盐-碳复合材料，并采用多种技术对其进行了研究。所得材料可作为吸附剂用于从水中去除有机污染物的过程。在本研究中，研究了活性炭固定在海藻酸钙中的效果。通过测量低温氮吸附/脱附等温线来确定结构性质。ALG_C8的比表面积最大，达到995 m²/g。基于扫描电子显微镜确定了海藻酸盐材料的形态。基于平衡和吸附动力学测量来评估吸附性能。布洛芬和双氯芬酸的最高吸附容量分别为0.381和0.873 mmol/g。采用广义朗缪尔等温线分析平衡数据。使用了许多方程和动力学模型来描述吸附速率数据，包括一级（FOE）和二级（SOE）动力学方程、1,2-混合级动力学方程（MOE）、类分形MOE方程（f-MOE）、多指数方程（m-exp），此外还有扩散模型：颗粒内扩散模型（IDM）和孔扩散模型（PDM）。基于合成空气气氛下热分析的数据确定热稳定性。
