Department of Chemical and Environmental Engineering, Technical University of Cartagena, Paseo Alfonso XIII, 30203 Cartagena, Spain.
Department Chemical Engineering, Campus of Espinardo, University of Murcia, 30100 Murcia, Spain.
Int J Environ Res Public Health. 2021 Apr 23;18(9):4489. doi: 10.3390/ijerph18094489.
In this paper, we describe the removal of cephalosporin C (CPC) from aqueous solutions by adsorption onto activated olive stones (AOS) in a stirred tank. For comparative purposes, several experiments of adsorption onto commercial granular activated carbon were carried out. A quantum study of the different species of cephalosporin C that, depending on the pH, exist in aqueous solution pointed to a favorable mass transfer process during adsorption. Activated olive stones were characterized by SEM, EDX and IR techniques and their pH was determined. A 10 M HCl cephalosporin C solution has been selected for the adsorption experiments because at the pH of that solution both electrostatic and hydrogen bond interactions are expected to be established between the adsorbate and the adsorbent. The adsorption process is best described by the Freundlich isotherm model and the pseudo-second-order kinetic model, while the adsorption mechanism is mainly controlled by film diffusion. Under the conditions studied, the adsorption process is of a physical nature, endothermic and spontaneous. Comparison of the adsorption results obtained in this paper with those of other authors shows that the efficiency of AOS is 20% of that of activated carbon but 65% higher than that of the XAD-2 adsorbent. Considering its low price, abundance, easy accessibility and eco-compatibility, the use of activated olive stones as adsorbents for the removal of emerging pollutants from aqueous solutions represents an interesting possibility from both the economic and the environmental points of view.
本文描述了在搅拌槽中通过吸附将头孢菌素 C（CPC）从水溶液中去除的方法。为了进行比较，进行了几次吸附到商业颗粒活性炭上的实验。对不同类型的头孢菌素 C 的量子研究表明，在吸附过程中存在有利的传质过程，这取决于 pH 值。采用 SEM、EDX 和 IR 技术对橄榄石进行了表征，并测定了其 pH 值。选择 10 M HCl 头孢菌素 C 溶液进行吸附实验，因为在该溶液的 pH 值下，预计吸附质和吸附剂之间将建立静电和氢键相互作用。吸附过程最好用 Freundlich 等温线模型和伪二阶动力学模型来描述，而吸附机制主要受膜扩散控制。在所研究的条件下，吸附过程是物理性质的，是吸热和自发的。将本文获得的吸附结果与其他作者的结果进行比较表明，AOS 的效率是活性炭的 20%，但比 XAD-2 吸附剂高 65%。考虑到其价格低廉、丰富、易于获取和生态相容性，从经济和环境角度来看，将橄榄石活化作为从水溶液中去除新兴污染物的吸附剂具有很大的吸引力。
