Rusu Lăcrămioara, Grigoraș Cristina-Gabriela, Simion Andrei-Ionuț, Suceveanu Elena-Mirela, Dediu Botezatu Andreea V, Harja Maria
Faculty of Engineering, Vasile Alecsandri University of Bacau, 157 Calea Mărăşeşti, 600115 Bacau, Romania.
Faculty of Sciences and Environment, Department of Chemistry Physical and Environment, Dunarea de Jos University of Galati, 111 Domneasca Street, 800201 Galati, Romania.
Materials (Basel). 2022 Jul 2;15(13):4657. doi: 10.3390/ma15134657.
In this study, ethacridine lactate removal from aqueous solution using a biosorbent material based on residual microbial biomass and natural polymers in fixed-bed continuous column was investigated. Composite beads of residual biomass and calcium alginate were obtained by immobilization technique. The prepared biosorbent was characterized by Fourier transformed infrared spectroscopy, scanning electron microscopy, and analysis of point of zero charge value. Then, laboratory-scale experiments by fixed-bed column biosorption were conducted in continuous system. To this purpose, the column bed high (5 cm; 7.5 cm), initial pollutant concentration (20 mg/L; 40 mg/L), and solution flow through the column (0.6 mL/min; 1.5 mL/min) were considered the main parameters. Recorded breakthrough curves suggest that lower flow rates, greater bed heights, and a lower concentration of ethacridine lactate led to an increased biosorption of the target compound. The biosorption dynamic was investigated by nonlinear regression analysis using the Adams-Bohart, Yoon-Nelson, Clark, and Yan mathematical models. Conclusively, our research highlights, firstly, that the obtained biosorbent material has the required properties for retaining the ethacridine lactate from aqueous solution in continuous system. Secondly, it emphasizes that the modeling approach reveals an acceptable fitting with the experimental data for the Yoon-Nelson, Clark, and Yan models.
在本研究中，对使用基于残留微生物生物质和天然聚合物的生物吸附剂材料在固定床连续柱中从水溶液中去除乳酸依沙吖啶进行了研究。通过固定化技术获得了残留生物质与海藻酸钙的复合珠粒。采用傅里叶变换红外光谱、扫描电子显微镜和零电荷点值分析对制备的生物吸附剂进行了表征。然后，在连续系统中进行了固定床柱生物吸附的实验室规模实验。为此，将柱床高度（5 cm；7.5 cm）、初始污染物浓度（20 mg/L；40 mg/L）和通过柱的溶液流速（0.6 mL/min；1.5 mL/min）视为主要参数。记录的穿透曲线表明，较低的流速、较大的床高和较低的乳酸依沙吖啶浓度导致目标化合物的生物吸附增加。使用亚当斯 - 博哈特、尹 - 尼尔森、克拉克和严数学模型通过非线性回归分析研究了生物吸附动力学。总之，我们的研究首先强调，所获得的生物吸附剂材料具有在连续系统中从水溶液中保留乳酸依沙吖啶所需的特性。其次，强调建模方法显示尹 - 尼尔森、克拉克和严模型与实验数据具有可接受的拟合度。
